Roll src/third_party/WebKit 06cb9e9:a978ee5 (svn 202558:202559)

[chromium-blink-merge.git] / third_party / lcov / bin / genhtml

#!/usr/bin/perl -w
#
#   Copyright (c) International Business Machines  Corp., 2002,2012
#
#   This program is free software;  you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or (at
#   your option) any later version.
#
#   This program is distributed in the hope that it will be useful, but
#   WITHOUT ANY WARRANTY;  without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#   General Public License for more details. 
#
#   You should have received a copy of the GNU General Public License
#   along with this program;  if not, write to the Free Software
#   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
#
# genhtml
#
#   This script generates HTML output from .info files as created by the
#   geninfo script. Call it with --help and refer to the genhtml man page
#   to get information on usage and available options.
#
#
# History:
#   2002-08-23 created by Peter Oberparleiter <Peter.Oberparleiter@de.ibm.com>
#                         IBM Lab Boeblingen
#        based on code by Manoj Iyer <manjo@mail.utexas.edu> and
#                         Megan Bock <mbock@us.ibm.com>
#                         IBM Austin
#   2002-08-27 / Peter Oberparleiter: implemented frame view
#   2002-08-29 / Peter Oberparleiter: implemented test description filtering
#                so that by default only descriptions for test cases which
#                actually hit some source lines are kept
#   2002-09-05 / Peter Oberparleiter: implemented --no-sourceview
#   2002-09-05 / Mike Kobler: One of my source file paths includes a "+" in
#                the directory name.  I found that genhtml.pl died when it
#                encountered it. I was able to fix the problem by modifying
#                the string with the escape character before parsing it.
#   2002-10-26 / Peter Oberparleiter: implemented --num-spaces
#   2003-04-07 / Peter Oberparleiter: fixed bug which resulted in an error
#                when trying to combine .info files containing data without
#                a test name
#   2003-04-10 / Peter Oberparleiter: extended fix by Mike to also cover
#                other special characters
#   2003-04-30 / Peter Oberparleiter: made info write to STDERR, not STDOUT
#   2003-07-10 / Peter Oberparleiter: added line checksum support
#   2004-08-09 / Peter Oberparleiter: added configuration file support
#   2005-03-04 / Cal Pierog: added legend to HTML output, fixed coloring of
#                "good coverage" background
#   2006-03-18 / Marcus Boerger: added --custom-intro, --custom-outro and
#                overwrite --no-prefix if --prefix is present
#   2006-03-20 / Peter Oberparleiter: changes to custom_* function (rename
#                to html_prolog/_epilog, minor modifications to implementation),
#                changed prefix/noprefix handling to be consistent with current
#                logic
#   2006-03-20 / Peter Oberparleiter: added --html-extension option
#   2008-07-14 / Tom Zoerner: added --function-coverage command line option;
#                added function table to source file page
#   2008-08-13 / Peter Oberparleiter: modified function coverage
#                implementation (now enabled per default),
#                introduced sorting option (enabled per default)
#

use strict;
use File::Basename; 
use Getopt::Long;
use Digest::MD5 qw(md5_base64);


# Global constants
our $title              = "LCOV - code coverage report";
our $lcov_version       = 'LCOV version 1.10';
our $lcov_url           = "http://ltp.sourceforge.net/coverage/lcov.php";
our $tool_name          = basename($0);

# Specify coverage rate limits (in %) for classifying file entries
# HI:   $hi_limit <= rate <= 100          graph color: green
# MED: $med_limit <= rate <  $hi_limit    graph color: orange
# LO:          0  <= rate <  $med_limit   graph color: red

# For line coverage/all coverage types if not specified
our $hi_limit = 90;
our $med_limit = 75;

# For function coverage
our $fn_hi_limit;
our $fn_med_limit;

# For branch coverage
our $br_hi_limit;
our $br_med_limit;

# Width of overview image
our $overview_width = 80;

# Resolution of overview navigation: this number specifies the maximum
# difference in lines between the position a user selected from the overview
# and the position the source code window is scrolled to.
our $nav_resolution = 4;

# Clicking a line in the overview image should show the source code view at
# a position a bit further up so that the requested line is not the first
# line in the window. This number specifies that offset in lines.
our $nav_offset = 10;

# Clicking on a function name should show the source code at a position a
# few lines before the first line of code of that function. This number
# specifies that offset in lines.
our $func_offset = 2;

our $overview_title = "top level";

# Width for line coverage information in the source code view
our $line_field_width = 12;

# Width for branch coverage information in the source code view
our $br_field_width = 16;

# Internal Constants

# Header types
our $HDR_DIR            = 0;
our $HDR_FILE           = 1;
our $HDR_SOURCE         = 2;
our $HDR_TESTDESC       = 3;
our $HDR_FUNC           = 4;

# Sort types
our $SORT_FILE          = 0;
our $SORT_LINE          = 1;
our $SORT_FUNC          = 2;
our $SORT_BRANCH        = 3;

# Fileview heading types
our $HEAD_NO_DETAIL     = 1;
our $HEAD_DETAIL_HIDDEN = 2;
our $HEAD_DETAIL_SHOWN  = 3;

# Offsets for storing branch coverage data in vectors
our $BR_BLOCK           = 0;
our $BR_BRANCH          = 1;
our $BR_TAKEN           = 2;
our $BR_VEC_ENTRIES     = 3;
our $BR_VEC_WIDTH       = 32;

# Additional offsets used when converting branch coverage data to HTML
our $BR_LEN     = 3;
our $BR_OPEN    = 4;
our $BR_CLOSE   = 5;

# Branch data combination types
our $BR_SUB = 0;
our $BR_ADD = 1;

# Error classes which users may specify to ignore during processing
our $ERROR_SOURCE       = 0;
our %ERROR_ID = (
        "source" => $ERROR_SOURCE,
);

# Data related prototypes
sub print_usage(*);
sub gen_html();
sub html_create($$);
sub process_dir($);
sub process_file($$$);
sub info(@);
sub read_info_file($);
sub get_info_entry($);
sub set_info_entry($$$$$$$$$;$$$$$$);
sub get_prefix($@);
sub shorten_prefix($);
sub get_dir_list(@);
sub get_relative_base_path($);
sub read_testfile($);
sub get_date_string();
sub create_sub_dir($);
sub subtract_counts($$);
sub add_counts($$);
sub apply_baseline($$);
sub remove_unused_descriptions();
sub get_found_and_hit($);
sub get_affecting_tests($$$);
sub combine_info_files($$);
sub merge_checksums($$$);
sub combine_info_entries($$$);
sub apply_prefix($$);
sub system_no_output($@);
sub read_config($);
sub apply_config($);
sub get_html_prolog($);
sub get_html_epilog($);
sub write_dir_page($$$$$$$$$$$$$$$$$);
sub classify_rate($$$$);
sub br_taken_add($$);
sub br_taken_sub($$);
sub br_ivec_len($);
sub br_ivec_get($$);
sub br_ivec_push($$$$);
sub combine_brcount($$$);
sub get_br_found_and_hit($);
sub warn_handler($);
sub die_handler($);
sub parse_ignore_errors(@);
sub rate($$;$$$);


# HTML related prototypes
sub escape_html($);
sub get_bar_graph_code($$$);

sub write_png_files();
sub write_htaccess_file();
sub write_css_file();
sub write_description_file($$$$$$$);
sub write_function_table(*$$$$$$$$$$);

sub write_html(*$);
sub write_html_prolog(*$$);
sub write_html_epilog(*$;$);

sub write_header(*$$$$$$$$$$);
sub write_header_prolog(*$);
sub write_header_line(*@);
sub write_header_epilog(*$);

sub write_file_table(*$$$$$$$);
sub write_file_table_prolog(*$@);
sub write_file_table_entry(*$$$@);
sub write_file_table_detail_entry(*$@);
sub write_file_table_epilog(*);

sub write_test_table_prolog(*$);
sub write_test_table_entry(*$$);
sub write_test_table_epilog(*);

sub write_source($$$$$$$);
sub write_source_prolog(*);
sub write_source_line(*$$$$$$);
sub write_source_epilog(*);

sub write_frameset(*$$$);
sub write_overview_line(*$$$);
sub write_overview(*$$$$);

# External prototype (defined in genpng)
sub gen_png($$$@);


# Global variables & initialization
our %info_data;         # Hash containing all data from .info file
our $dir_prefix;        # Prefix to remove from all sub directories
our %test_description;  # Hash containing test descriptions if available
our $date = get_date_string();

our @info_filenames;    # List of .info files to use as data source
our $test_title;        # Title for output as written to each page header
our $output_directory;  # Name of directory in which to store output
our $base_filename;     # Optional name of file containing baseline data
our $desc_filename;     # Name of file containing test descriptions
our $css_filename;      # Optional name of external stylesheet file to use
our $quiet;             # If set, suppress information messages
our $help;              # Help option flag
our $version;           # Version option flag
our $show_details;      # If set, generate detailed directory view
our $no_prefix;         # If set, do not remove filename prefix
our $func_coverage;     # If set, generate function coverage statistics
our $no_func_coverage;  # Disable func_coverage
our $br_coverage;       # If set, generate branch coverage statistics
our $no_br_coverage;    # Disable br_coverage
our $sort = 1;          # If set, provide directory listings with sorted entries
our $no_sort;           # Disable sort
our $frames;            # If set, use frames for source code view
our $keep_descriptions; # If set, do not remove unused test case descriptions
our $no_sourceview;     # If set, do not create a source code view for each file
our $highlight;         # If set, highlight lines covered by converted data only
our $legend;            # If set, include legend in output
our $tab_size = 8;      # Number of spaces to use in place of tab
our $config;            # Configuration file contents
our $html_prolog_file;  # Custom HTML prolog file (up to and including <body>)
our $html_epilog_file;  # Custom HTML epilog file (from </body> onwards)
our $html_prolog;       # Actual HTML prolog
our $html_epilog;       # Actual HTML epilog
our $html_ext = "html"; # Extension for generated HTML files
our $html_gzip = 0;     # Compress with gzip
our $demangle_cpp = 0;  # Demangle C++ function names
our @opt_ignore_errors; # Ignore certain error classes during processing
our @ignore;
our $opt_config_file;   # User-specified configuration file location
our %opt_rc;
our $charset = "UTF-8"; # Default charset for HTML pages
our @fileview_sortlist;
our @fileview_sortname = ("", "-sort-l", "-sort-f", "-sort-b");
our @funcview_sortlist;
our @rate_name = ("Lo", "Med", "Hi");
our @rate_png = ("ruby.png", "amber.png", "emerald.png");
our $lcov_func_coverage = 1;
our $lcov_branch_coverage = 0;

our $cwd = `pwd`;       # Current working directory
chomp($cwd);
our $tool_dir = dirname($0);    # Directory where genhtml tool is installed


#
# Code entry point
#

$SIG{__WARN__} = \&warn_handler;
$SIG{__DIE__} = \&die_handler;

# Prettify version string
$lcov_version =~ s/\$\s*Revision\s*:?\s*(\S+)\s*\$/$1/;

# Add current working directory if $tool_dir is not already an absolute path
if (! ($tool_dir =~ /^\/(.*)$/))
{
        $tool_dir = "$cwd/$tool_dir";
}

# Check command line for a configuration file name
Getopt::Long::Configure("pass_through", "no_auto_abbrev");
GetOptions("config-file=s" => \$opt_config_file,
           "rc=s%" => \%opt_rc);
Getopt::Long::Configure("default");

# Read configuration file if available
if (defined($opt_config_file)) {
        $config = read_config($opt_config_file);
} elsif (defined($ENV{"HOME"}) && (-r $ENV{"HOME"}."/.lcovrc"))
{
        $config = read_config($ENV{"HOME"}."/.lcovrc");
}
elsif (-r "/etc/lcovrc")
{
        $config = read_config("/etc/lcovrc");
}

if ($config || %opt_rc)
{
        # Copy configuration file and --rc values to variables
        apply_config({
                "genhtml_css_file"              => \$css_filename,
                "genhtml_hi_limit"              => \$hi_limit,
                "genhtml_med_limit"             => \$med_limit,
                "genhtml_line_field_width"      => \$line_field_width,
                "genhtml_overview_width"        => \$overview_width,
                "genhtml_nav_resolution"        => \$nav_resolution,
                "genhtml_nav_offset"            => \$nav_offset,
                "genhtml_keep_descriptions"     => \$keep_descriptions,
                "genhtml_no_prefix"             => \$no_prefix,
                "genhtml_no_source"             => \$no_sourceview,
                "genhtml_num_spaces"            => \$tab_size,
                "genhtml_highlight"             => \$highlight,
                "genhtml_legend"                => \$legend,
                "genhtml_html_prolog"           => \$html_prolog_file,
                "genhtml_html_epilog"           => \$html_epilog_file,
                "genhtml_html_extension"        => \$html_ext,
                "genhtml_html_gzip"             => \$html_gzip,
                "genhtml_function_hi_limit"     => \$fn_hi_limit,
                "genhtml_function_med_limit"    => \$fn_med_limit,
                "genhtml_function_coverage"     => \$func_coverage,
                "genhtml_branch_hi_limit"       => \$br_hi_limit,
                "genhtml_branch_med_limit"      => \$br_med_limit,
                "genhtml_branch_coverage"       => \$br_coverage,
                "genhtml_branch_field_width"    => \$br_field_width,
                "genhtml_sort"                  => \$sort,
                "genhtml_charset"               => \$charset,
                "lcov_function_coverage"        => \$lcov_func_coverage,
                "lcov_branch_coverage"          => \$lcov_branch_coverage,
                });
}

# Copy related values if not specified
$fn_hi_limit    = $hi_limit if (!defined($fn_hi_limit));
$fn_med_limit   = $med_limit if (!defined($fn_med_limit));
$br_hi_limit    = $hi_limit if (!defined($br_hi_limit));
$br_med_limit   = $med_limit if (!defined($br_med_limit));
$func_coverage  = $lcov_func_coverage if (!defined($func_coverage));
$br_coverage    = $lcov_branch_coverage if (!defined($br_coverage));

# Parse command line options
if (!GetOptions("output-directory|o=s"  => \$output_directory,
                "title|t=s"             => \$test_title,
                "description-file|d=s"  => \$desc_filename,
                "keep-descriptions|k"   => \$keep_descriptions,
                "css-file|c=s"          => \$css_filename,
                "baseline-file|b=s"     => \$base_filename,
                "prefix|p=s"            => \$dir_prefix,
                "num-spaces=i"          => \$tab_size,
                "no-prefix"             => \$no_prefix,
                "no-sourceview"         => \$no_sourceview,
                "show-details|s"        => \$show_details,
                "frames|f"              => \$frames,
                "highlight"             => \$highlight,
                "legend"                => \$legend,
                "quiet|q"               => \$quiet,
                "help|h|?"              => \$help,
                "version|v"             => \$version,
                "html-prolog=s"         => \$html_prolog_file,
                "html-epilog=s"         => \$html_epilog_file,
                "html-extension=s"      => \$html_ext,
                "html-gzip"             => \$html_gzip,
                "function-coverage"     => \$func_coverage,
                "no-function-coverage"  => \$no_func_coverage,
                "branch-coverage"       => \$br_coverage,
                "no-branch-coverage"    => \$no_br_coverage,
                "sort"                  => \$sort,
                "no-sort"               => \$no_sort,
                "demangle-cpp"          => \$demangle_cpp,
                "ignore-errors=s"       => \@opt_ignore_errors,
                "config-file=s"         => \$opt_config_file,
                "rc=s%"                 => \%opt_rc,
                ))
{
        print(STDERR "Use $tool_name --help to get usage information\n");
        exit(1);
} else {
        # Merge options
        if ($no_func_coverage) {
                $func_coverage = 0;
        }
        if ($no_br_coverage) {
                $br_coverage = 0;
        }

        # Merge sort options
        if ($no_sort) {
                $sort = 0;
        }
}

@info_filenames = @ARGV;

# Check for help option
if ($help)
{
        print_usage(*STDOUT);
        exit(0);
}

# Check for version option
if ($version)
{
        print("$tool_name: $lcov_version\n");
        exit(0);
}

# Determine which errors the user wants us to ignore
parse_ignore_errors(@opt_ignore_errors);

# Check for info filename
if (!@info_filenames)
{
        die("No filename specified\n".
            "Use $tool_name --help to get usage information\n");
}

# Generate a title if none is specified
if (!$test_title)
{
        if (scalar(@info_filenames) == 1)
        {
                # Only one filename specified, use it as title
                $test_title = basename($info_filenames[0]);
        }
        else
        {
                # More than one filename specified, used default title
                $test_title = "unnamed";
        }
}

# Make sure css_filename is an absolute path (in case we're changing
# directories)
if ($css_filename)
{
        if (!($css_filename =~ /^\/(.*)$/))
        {
                $css_filename = $cwd."/".$css_filename;
        }
}

# Make sure tab_size is within valid range
if ($tab_size < 1)
{
        print(STDERR "ERROR: invalid number of spaces specified: ".
                     "$tab_size!\n");
        exit(1);
}

# Get HTML prolog and epilog
$html_prolog = get_html_prolog($html_prolog_file);
$html_epilog = get_html_epilog($html_epilog_file);

# Issue a warning if --no-sourceview is enabled together with --frames
if ($no_sourceview && defined($frames))
{
        warn("WARNING: option --frames disabled because --no-sourceview ".
             "was specified!\n");
        $frames = undef;
}

# Issue a warning if --no-prefix is enabled together with --prefix
if ($no_prefix && defined($dir_prefix))
{
        warn("WARNING: option --prefix disabled because --no-prefix was ".
             "specified!\n");
        $dir_prefix = undef;
}

@fileview_sortlist = ($SORT_FILE);
@funcview_sortlist = ($SORT_FILE);

if ($sort) {
        push(@fileview_sortlist, $SORT_LINE);
        push(@fileview_sortlist, $SORT_FUNC) if ($func_coverage);
        push(@fileview_sortlist, $SORT_BRANCH) if ($br_coverage);
        push(@funcview_sortlist, $SORT_LINE);
}

if ($frames)
{
        # Include genpng code needed for overview image generation
        do("$tool_dir/genpng");
}

# Ensure that the c++filt tool is available when using --demangle-cpp
if ($demangle_cpp)
{
        if (system_no_output(3, "c++filt", "--version")) {
                die("ERROR: could not find c++filt tool needed for ".
                    "--demangle-cpp\n");
        }
}

# Make sure output_directory exists, create it if necessary
if ($output_directory)
{
        stat($output_directory);

        if (! -e _)
        {
                create_sub_dir($output_directory);
        }
}

# Do something
gen_html();

exit(0);



#
# print_usage(handle)
#
# Print usage information.
#

sub print_usage(*)
{
        local *HANDLE = $_[0];

        print(HANDLE <<END_OF_USAGE);
Usage: $tool_name [OPTIONS] INFOFILE(S)

Create HTML output for coverage data found in INFOFILE. Note that INFOFILE
may also be a list of filenames.

Misc:
  -h, --help                        Print this help, then exit
  -v, --version                     Print version number, then exit
  -q, --quiet                       Do not print progress messages
      --config-file FILENAME        Specify configuration file location
      --rc SETTING=VALUE            Override configuration file setting
      --ignore-errors ERRORS        Continue after ERRORS (source)

Operation:
  -o, --output-directory OUTDIR     Write HTML output to OUTDIR
  -s, --show-details                Generate detailed directory view
  -d, --description-file DESCFILE   Read test case descriptions from DESCFILE
  -k, --keep-descriptions           Do not remove unused test descriptions
  -b, --baseline-file BASEFILE      Use BASEFILE as baseline file
  -p, --prefix PREFIX               Remove PREFIX from all directory names
      --no-prefix                   Do not remove prefix from directory names
      --(no-)function-coverage      Enable (disable) function coverage display
      --(no-)branch-coverage        Enable (disable) branch coverage display

HTML output:
  -f, --frames                      Use HTML frames for source code view
  -t, --title TITLE                 Display TITLE in header of all pages
  -c, --css-file CSSFILE            Use external style sheet file CSSFILE
      --no-source                   Do not create source code view
      --num-spaces NUM              Replace tabs with NUM spaces in source view
      --highlight                   Highlight lines with converted-only data
      --legend                      Include color legend in HTML output
      --html-prolog FILE            Use FILE as HTML prolog for generated pages
      --html-epilog FILE            Use FILE as HTML epilog for generated pages
      --html-extension EXT          Use EXT as filename extension for pages
      --html-gzip                   Use gzip to compress HTML
      --(no-)sort                   Enable (disable) sorted coverage views
      --demangle-cpp                Demangle C++ function names

For more information see: $lcov_url
END_OF_USAGE
        ;
}


#
# get_rate(found, hit)
#
# Return a relative value for the specified found&hit values
# which is used for sorting the corresponding entries in a
# file list.
#

sub get_rate($$)
{
        my ($found, $hit) = @_;

        if ($found == 0) {
                return 10000;
        }
        return int($hit * 1000 / $found) * 10 + 2 - (1 / $found);
}


#
# get_overall_line(found, hit, name_singular, name_plural)
#
# Return a string containing overall information for the specified
# found/hit data.
#

sub get_overall_line($$$$)
{
        my ($found, $hit, $name_sn, $name_pl) = @_;
        my $name;

        return "no data found" if (!defined($found) || $found == 0);
        $name = ($found == 1) ? $name_sn : $name_pl;
        return rate($hit, $found, "% ($hit of $found $name)");
}


#
# print_overall_rate(ln_do, ln_found, ln_hit, fn_do, fn_found, fn_hit, br_do
#                    br_found, br_hit)
#
# Print overall coverage rates for the specified coverage types.
#

sub print_overall_rate($$$$$$$$$)
{
        my ($ln_do, $ln_found, $ln_hit, $fn_do, $fn_found, $fn_hit,
            $br_do, $br_found, $br_hit) = @_;

        info("Overall coverage rate:\n");
        info("  lines......: %s\n",
             get_overall_line($ln_found, $ln_hit, "line", "lines"))
                if ($ln_do);
        info("  functions..: %s\n",
             get_overall_line($fn_found, $fn_hit, "function", "functions"))
                if ($fn_do);
        info("  branches...: %s\n",
             get_overall_line($br_found, $br_hit, "branch", "branches"))
                if ($br_do);
}


#
# gen_html()
#
# Generate a set of HTML pages from contents of .info file INFO_FILENAME.
# Files will be written to the current directory. If provided, test case
# descriptions will be read from .tests file TEST_FILENAME and included
# in ouput.
#
# Die on error.
#

sub gen_html()
{
        local *HTML_HANDLE;
        my %overview;
        my %base_data;
        my $lines_found;
        my $lines_hit;
        my $fn_found;
        my $fn_hit;
        my $br_found;
        my $br_hit;
        my $overall_found = 0;
        my $overall_hit = 0;
        my $total_fn_found = 0;
        my $total_fn_hit = 0;
        my $total_br_found = 0;
        my $total_br_hit = 0;
        my $dir_name;
        my $link_name;
        my @dir_list;
        my %new_info;

        # Read in all specified .info files
        foreach (@info_filenames)
        {
                %new_info = %{read_info_file($_)};

                # Combine %new_info with %info_data
                %info_data = %{combine_info_files(\%info_data, \%new_info)};
        }

        info("Found %d entries.\n", scalar(keys(%info_data)));

        # Read and apply baseline data if specified
        if ($base_filename)
        {
                # Read baseline file
                info("Reading baseline file $base_filename\n");
                %base_data = %{read_info_file($base_filename)};
                info("Found %d entries.\n", scalar(keys(%base_data)));

                # Apply baseline
                info("Subtracting baseline data.\n");
                %info_data = %{apply_baseline(\%info_data, \%base_data)};
        }

        @dir_list = get_dir_list(keys(%info_data));

        if ($no_prefix)
        {
                # User requested that we leave filenames alone
                info("User asked not to remove filename prefix\n");
        }
        elsif (!defined($dir_prefix))
        {
                # Get prefix common to most directories in list
                $dir_prefix = get_prefix(1, keys(%info_data));

                if ($dir_prefix)
                {
                        info("Found common filename prefix \"$dir_prefix\"\n");
                }
                else
                {
                        info("No common filename prefix found!\n");
                        $no_prefix=1;
                }
        }
        else
        {
                info("Using user-specified filename prefix \"".
                     "$dir_prefix\"\n");
        }

        # Read in test description file if specified
        if ($desc_filename)
        {
                info("Reading test description file $desc_filename\n");
                %test_description = %{read_testfile($desc_filename)};

                # Remove test descriptions which are not referenced
                # from %info_data if user didn't tell us otherwise
                if (!$keep_descriptions)
                {
                        remove_unused_descriptions();
                }
        }

        # Change to output directory if specified
        if ($output_directory)
        {
                chdir($output_directory)
                        or die("ERROR: cannot change to directory ".
                        "$output_directory!\n");
        }

        info("Writing .css and .png files.\n");
        write_css_file();
        write_png_files();

        if ($html_gzip)
        {
                info("Writing .htaccess file.\n");
                write_htaccess_file();
        }

        info("Generating output.\n");

        # Process each subdirectory and collect overview information
        foreach $dir_name (@dir_list)
        {
                ($lines_found, $lines_hit, $fn_found, $fn_hit,
                 $br_found, $br_hit)
                        = process_dir($dir_name);

                # Handle files in root directory gracefully
                $dir_name = "root" if ($dir_name eq "");

                # Remove prefix if applicable
                if (!$no_prefix && $dir_prefix)
                {
                        # Match directory names beginning with $dir_prefix
                        $dir_name = apply_prefix($dir_name, $dir_prefix);
                }

                # Generate name for directory overview HTML page
                if ($dir_name =~ /^\/(.*)$/)
                {
                        $link_name = substr($dir_name, 1)."/index.$html_ext";
                }
                else
                {
                        $link_name = $dir_name."/index.$html_ext";
                }

                $overview{$dir_name} = [$lines_found, $lines_hit, $fn_found,
                                        $fn_hit, $br_found, $br_hit, $link_name,
                                        get_rate($lines_found, $lines_hit),
                                        get_rate($fn_found, $fn_hit),
                                        get_rate($br_found, $br_hit)];
                $overall_found  += $lines_found;
                $overall_hit    += $lines_hit;
                $total_fn_found += $fn_found;
                $total_fn_hit   += $fn_hit;
                $total_br_found += $br_found;
                $total_br_hit   += $br_hit;
        }

        # Generate overview page
        info("Writing directory view page.\n");

        # Create sorted pages
        foreach (@fileview_sortlist) {
                write_dir_page($fileview_sortname[$_], ".", "", $test_title,
                               undef, $overall_found, $overall_hit,
                               $total_fn_found, $total_fn_hit, $total_br_found,
                               $total_br_hit, \%overview, {}, {}, {}, 0, $_);
        }

        # Check if there are any test case descriptions to write out
        if (%test_description)
        {
                info("Writing test case description file.\n");
                write_description_file( \%test_description,
                                        $overall_found, $overall_hit,
                                        $total_fn_found, $total_fn_hit,
                                        $total_br_found, $total_br_hit);
        }

        print_overall_rate(1, $overall_found, $overall_hit,
                           $func_coverage, $total_fn_found, $total_fn_hit,
                           $br_coverage, $total_br_found, $total_br_hit);

        chdir($cwd);
}

#
# html_create(handle, filename)
#

sub html_create($$)
{
        my $handle = $_[0];
        my $filename = $_[1];

        if ($html_gzip)
        {
                open($handle, "|-", "gzip -c >'$filename'")
                        or die("ERROR: cannot open $filename for writing ".
                               "(gzip)!\n");
        }
        else
        {
                open($handle, ">", $filename)
                        or die("ERROR: cannot open $filename for writing!\n");
        }
}

sub write_dir_page($$$$$$$$$$$$$$$$$)
{
        my ($name, $rel_dir, $base_dir, $title, $trunc_dir, $overall_found,
            $overall_hit, $total_fn_found, $total_fn_hit, $total_br_found,
            $total_br_hit, $overview, $testhash, $testfnchash, $testbrhash,
            $view_type, $sort_type) = @_;

        # Generate directory overview page including details
        html_create(*HTML_HANDLE, "$rel_dir/index$name.$html_ext");
        if (!defined($trunc_dir)) {
                $trunc_dir = "";
        }
        $title .= " - " if ($trunc_dir ne "");
        write_html_prolog(*HTML_HANDLE, $base_dir, "LCOV - $title$trunc_dir");
        write_header(*HTML_HANDLE, $view_type, $trunc_dir, $rel_dir,
                     $overall_found, $overall_hit, $total_fn_found,
                     $total_fn_hit, $total_br_found, $total_br_hit, $sort_type);
        write_file_table(*HTML_HANDLE, $base_dir, $overview, $testhash,
                         $testfnchash, $testbrhash, $view_type, $sort_type);
        write_html_epilog(*HTML_HANDLE, $base_dir);
        close(*HTML_HANDLE);
}


#
# process_dir(dir_name)
#

sub process_dir($)
{
        my $abs_dir = $_[0];
        my $trunc_dir;
        my $rel_dir = $abs_dir;
        my $base_dir;
        my $filename;
        my %overview;
        my $lines_found;
        my $lines_hit;
        my $fn_found;
        my $fn_hit;
        my $br_found;
        my $br_hit;
        my $overall_found=0;
        my $overall_hit=0;
        my $total_fn_found=0;
        my $total_fn_hit=0;
        my $total_br_found = 0;
        my $total_br_hit = 0;
        my $base_name;
        my $extension;
        my $testdata;
        my %testhash;
        my $testfncdata;
        my %testfnchash;
        my $testbrdata;
        my %testbrhash;
        my @sort_list;
        local *HTML_HANDLE;

        # Remove prefix if applicable
        if (!$no_prefix)
        {
                # Match directory name beginning with $dir_prefix
                $rel_dir = apply_prefix($rel_dir, $dir_prefix);
        }

        $trunc_dir = $rel_dir;

        # Remove leading /
        if ($rel_dir =~ /^\/(.*)$/)
        {
                $rel_dir = substr($rel_dir, 1);
        }

        # Handle files in root directory gracefully
        $rel_dir = "root" if ($rel_dir eq "");
        $trunc_dir = "root" if ($trunc_dir eq "");

        $base_dir = get_relative_base_path($rel_dir);

        create_sub_dir($rel_dir);

        # Match filenames which specify files in this directory, not including
        # sub-directories
        foreach $filename (grep(/^\Q$abs_dir\E\/[^\/]*$/,keys(%info_data)))
        {
                my $page_link;
                my $func_link;

                ($lines_found, $lines_hit, $fn_found, $fn_hit, $br_found,
                 $br_hit, $testdata, $testfncdata, $testbrdata) =
                        process_file($trunc_dir, $rel_dir, $filename);

                $base_name = basename($filename);

                if ($no_sourceview) {
                        $page_link = "";
                } elsif ($frames) {
                        # Link to frameset page
                        $page_link = "$base_name.gcov.frameset.$html_ext";
                } else {
                        # Link directory to source code view page
                        $page_link = "$base_name.gcov.$html_ext";
                }
                $overview{$base_name} = [$lines_found, $lines_hit, $fn_found,
                                         $fn_hit, $br_found, $br_hit,
                                         $page_link,
                                         get_rate($lines_found, $lines_hit),
                                         get_rate($fn_found, $fn_hit),
                                         get_rate($br_found, $br_hit)];

                $testhash{$base_name} = $testdata;
                $testfnchash{$base_name} = $testfncdata;
                $testbrhash{$base_name} = $testbrdata;

                $overall_found  += $lines_found;
                $overall_hit    += $lines_hit;

                $total_fn_found += $fn_found;
                $total_fn_hit   += $fn_hit;

                $total_br_found += $br_found;
                $total_br_hit   += $br_hit;
        }

        # Create sorted pages
        foreach (@fileview_sortlist) {
                # Generate directory overview page (without details)    
                write_dir_page($fileview_sortname[$_], $rel_dir, $base_dir,
                               $test_title, $trunc_dir, $overall_found,
                               $overall_hit, $total_fn_found, $total_fn_hit,
                               $total_br_found, $total_br_hit, \%overview, {},
                               {}, {}, 1, $_);
                if (!$show_details) {
                        next;
                }
                # Generate directory overview page including details
                write_dir_page("-detail".$fileview_sortname[$_], $rel_dir,
                               $base_dir, $test_title, $trunc_dir,
                               $overall_found, $overall_hit, $total_fn_found,
                               $total_fn_hit, $total_br_found, $total_br_hit,
                               \%overview, \%testhash, \%testfnchash,
                               \%testbrhash, 1, $_);
        }

        # Calculate resulting line counts
        return ($overall_found, $overall_hit, $total_fn_found, $total_fn_hit,
                $total_br_found, $total_br_hit);
}


#
# get_converted_lines(testdata)
#
# Return hash of line numbers of those lines which were only covered in
# converted data sets.
#

sub get_converted_lines($)
{
        my $testdata = $_[0];
        my $testcount;
        my %converted;
        my %nonconverted;
        my $hash;
        my $testcase;
        my $line;
        my %result;


        # Get a hash containing line numbers with positive counts both for
        # converted and original data sets
        foreach $testcase (keys(%{$testdata}))
        {
                # Check to see if this is a converted data set
                if ($testcase =~ /,diff$/)
                {
                        $hash = \%converted;
                }
                else
                {
                        $hash = \%nonconverted;
                }

                $testcount = $testdata->{$testcase};
                # Add lines with a positive count to hash
                foreach $line (keys%{$testcount})
                {
                        if ($testcount->{$line} > 0)
                        {
                                $hash->{$line} = 1;
                        }
                }
        }

        # Combine both hashes to resulting list
        foreach $line (keys(%converted))
        {
                if (!defined($nonconverted{$line}))
                {
                        $result{$line} = 1;
                }
        }

        return \%result;
}


sub write_function_page($$$$$$$$$$$$$$$$$$)
{
        my ($base_dir, $rel_dir, $trunc_dir, $base_name, $title,
            $lines_found, $lines_hit, $fn_found, $fn_hit, $br_found, $br_hit,
            $sumcount, $funcdata, $sumfnccount, $testfncdata, $sumbrcount,
            $testbrdata, $sort_type) = @_;
        my $pagetitle;
        my $filename;

        # Generate function table for this file
        if ($sort_type == 0) {
                $filename = "$rel_dir/$base_name.func.$html_ext";
        } else {
                $filename = "$rel_dir/$base_name.func-sort-c.$html_ext";
        }
        html_create(*HTML_HANDLE, $filename);
        $pagetitle = "LCOV - $title - $trunc_dir/$base_name - functions";
        write_html_prolog(*HTML_HANDLE, $base_dir, $pagetitle);
        write_header(*HTML_HANDLE, 4, "$trunc_dir/$base_name",
                     "$rel_dir/$base_name", $lines_found, $lines_hit,
                     $fn_found, $fn_hit, $br_found, $br_hit, $sort_type);
        write_function_table(*HTML_HANDLE, "$base_name.gcov.$html_ext",
                             $sumcount, $funcdata,
                             $sumfnccount, $testfncdata, $sumbrcount,
                             $testbrdata, $base_name,
                             $base_dir, $sort_type);
        write_html_epilog(*HTML_HANDLE, $base_dir, 1);
        close(*HTML_HANDLE);
}


#
# process_file(trunc_dir, rel_dir, filename)
#

sub process_file($$$)
{
        info("Processing file ".apply_prefix($_[2], $dir_prefix)."\n");

        my $trunc_dir = $_[0];
        my $rel_dir = $_[1];
        my $filename = $_[2];
        my $base_name = basename($filename);
        my $base_dir = get_relative_base_path($rel_dir);
        my $testdata;
        my $testcount;
        my $sumcount;
        my $funcdata;
        my $checkdata;
        my $testfncdata;
        my $sumfnccount;
        my $testbrdata;
        my $sumbrcount;
        my $lines_found;
        my $lines_hit;
        my $fn_found;
        my $fn_hit;
        my $br_found;
        my $br_hit;
        my $converted;
        my @source;
        my $pagetitle;
        local *HTML_HANDLE;

        ($testdata, $sumcount, $funcdata, $checkdata, $testfncdata,
         $sumfnccount, $testbrdata, $sumbrcount, $lines_found, $lines_hit,
         $fn_found, $fn_hit, $br_found, $br_hit)
                = get_info_entry($info_data{$filename});

        # Return after this point in case user asked us not to generate
        # source code view
        if ($no_sourceview)
        {
                return ($lines_found, $lines_hit, $fn_found, $fn_hit,
                        $br_found, $br_hit, $testdata, $testfncdata,
                        $testbrdata);
        }

        $converted = get_converted_lines($testdata);
        # Generate source code view for this file
        html_create(*HTML_HANDLE, "$rel_dir/$base_name.gcov.$html_ext");
        $pagetitle = "LCOV - $test_title - $trunc_dir/$base_name";
        write_html_prolog(*HTML_HANDLE, $base_dir, $pagetitle);
        write_header(*HTML_HANDLE, 2, "$trunc_dir/$base_name",
                     "$rel_dir/$base_name", $lines_found, $lines_hit,
                     $fn_found, $fn_hit, $br_found, $br_hit, 0);
        @source = write_source(*HTML_HANDLE, $filename, $sumcount, $checkdata,
                               $converted, $funcdata, $sumbrcount);

        write_html_epilog(*HTML_HANDLE, $base_dir, 1);
        close(*HTML_HANDLE);

        if ($func_coverage) {
                # Create function tables
                foreach (@funcview_sortlist) {
                        write_function_page($base_dir, $rel_dir, $trunc_dir,
                                            $base_name, $test_title,
                                            $lines_found, $lines_hit,
                                            $fn_found, $fn_hit, $br_found,
                                            $br_hit, $sumcount,
                                            $funcdata, $sumfnccount,
                                            $testfncdata, $sumbrcount,
                                            $testbrdata, $_);
                }
        }

        # Additional files are needed in case of frame output
        if (!$frames)
        {
                return ($lines_found, $lines_hit, $fn_found, $fn_hit,
                        $br_found, $br_hit, $testdata, $testfncdata,
                        $testbrdata);
        }

        # Create overview png file
        gen_png("$rel_dir/$base_name.gcov.png", $overview_width, $tab_size,
                @source);

        # Create frameset page
        html_create(*HTML_HANDLE,
                    "$rel_dir/$base_name.gcov.frameset.$html_ext");
        write_frameset(*HTML_HANDLE, $base_dir, $base_name, $pagetitle);
        close(*HTML_HANDLE);

        # Write overview frame
        html_create(*HTML_HANDLE,
                    "$rel_dir/$base_name.gcov.overview.$html_ext");
        write_overview(*HTML_HANDLE, $base_dir, $base_name, $pagetitle,
                       scalar(@source));
        close(*HTML_HANDLE);

        return ($lines_found, $lines_hit, $fn_found, $fn_hit, $br_found,
                $br_hit, $testdata, $testfncdata, $testbrdata);
}


#
# read_info_file(info_filename)
#
# Read in the contents of the .info file specified by INFO_FILENAME. Data will
# be returned as a reference to a hash containing the following mappings:
#
# %result: for each filename found in file -> \%data
#
# %data: "test"  -> \%testdata
#        "sum"   -> \%sumcount
#        "func"  -> \%funcdata
#        "found" -> $lines_found (number of instrumented lines found in file)
#        "hit"   -> $lines_hit (number of executed lines in file)
#        "check" -> \%checkdata
#        "testfnc" -> \%testfncdata
#        "sumfnc"  -> \%sumfnccount
#        "testbr"  -> \%testbrdata
#        "sumbr"   -> \%sumbrcount
#
# %testdata   : name of test affecting this file -> \%testcount
# %testfncdata: name of test affecting this file -> \%testfnccount
# %testbrdata:  name of test affecting this file -> \%testbrcount
#
# %testcount   : line number   -> execution count for a single test
# %testfnccount: function name -> execution count for a single test
# %testbrcount : line number   -> branch coverage data for a single test
# %sumcount    : line number   -> execution count for all tests
# %sumfnccount : function name -> execution count for all tests
# %sumbrcount  : line number   -> branch coverage data for all tests
# %funcdata    : function name -> line number
# %checkdata   : line number   -> checksum of source code line
# $brdata      : vector of items: block, branch, taken
# 
# Note that .info file sections referring to the same file and test name
# will automatically be combined by adding all execution counts.
#
# Note that if INFO_FILENAME ends with ".gz", it is assumed that the file
# is compressed using GZIP. If available, GUNZIP will be used to decompress
# this file.
#
# Die on error.
#

sub read_info_file($)
{
        my $tracefile = $_[0];          # Name of tracefile
        my %result;                     # Resulting hash: file -> data
        my $data;                       # Data handle for current entry
        my $testdata;                   #       "             "
        my $testcount;                  #       "             "
        my $sumcount;                   #       "             "
        my $funcdata;                   #       "             "
        my $checkdata;                  #       "             "
        my $testfncdata;
        my $testfnccount;
        my $sumfnccount;
        my $testbrdata;
        my $testbrcount;
        my $sumbrcount;
        my $line;                       # Current line read from .info file
        my $testname;                   # Current test name
        my $filename;                   # Current filename
        my $hitcount;                   # Count for lines hit
        my $count;                      # Execution count of current line
        my $negative;                   # If set, warn about negative counts
        my $changed_testname;           # If set, warn about changed testname
        my $line_checksum;              # Checksum of current line
        my $br_found;
        my $br_hit;
        local *INFO_HANDLE;             # Filehandle for .info file

        info("Reading data file $tracefile\n");

        # Check if file exists and is readable
        stat($_[0]);
        if (!(-r _))
        {
                die("ERROR: cannot read file $_[0]!\n");
        }

        # Check if this is really a plain file
        if (!(-f _))
        {
                die("ERROR: not a plain file: $_[0]!\n");
        }

        # Check for .gz extension
        if ($_[0] =~ /\.gz$/)
        {
                # Check for availability of GZIP tool
                system_no_output(1, "gunzip" ,"-h")
                        and die("ERROR: gunzip command not available!\n");

                # Check integrity of compressed file
                system_no_output(1, "gunzip", "-t", $_[0])
                        and die("ERROR: integrity check failed for ".
                                "compressed file $_[0]!\n");

                # Open compressed file
                open(INFO_HANDLE, "-|", "gunzip -c '$_[0]'")
                        or die("ERROR: cannot start gunzip to decompress ".
                               "file $_[0]!\n");
        }
        else
        {
                # Open decompressed file
                open(INFO_HANDLE, "<", $_[0])
                        or die("ERROR: cannot read file $_[0]!\n");
        }

        $testname = "";
        while (<INFO_HANDLE>)
        {
                chomp($_);
                $line = $_;

                # Switch statement
                foreach ($line)
                {
                        /^TN:([^,]*)(,diff)?/ && do
                        {
                                # Test name information found
                                $testname = defined($1) ? $1 : "";
                                if ($testname =~ s/\W/_/g)
                                {
                                        $changed_testname = 1;
                                }
                                $testname .= $2 if (defined($2));
                                last;
                        };

                        /^[SK]F:(.*)/ && do
                        {
                                # Filename information found
                                # Retrieve data for new entry
                                $filename = $1;

                                $data = $result{$filename};
                                ($testdata, $sumcount, $funcdata, $checkdata,
                                 $testfncdata, $sumfnccount, $testbrdata,
                                 $sumbrcount) =
                                        get_info_entry($data);

                                if (defined($testname))
                                {
                                        $testcount = $testdata->{$testname};
                                        $testfnccount = $testfncdata->{$testname};
                                        $testbrcount = $testbrdata->{$testname};
                                }
                                else
                                {
                                        $testcount = {};
                                        $testfnccount = {};
                                        $testbrcount = {};
                                }
                                last;
                        };

                        /^DA:(\d+),(-?\d+)(,[^,\s]+)?/ && do
                        {
                                # Fix negative counts
                                $count = $2 < 0 ? 0 : $2;
                                if ($2 < 0)
                                {
                                        $negative = 1;
                                }
                                # Execution count found, add to structure
                                # Add summary counts
                                $sumcount->{$1} += $count;

                                # Add test-specific counts
                                if (defined($testname))
                                {
                                        $testcount->{$1} += $count;
                                }

                                # Store line checksum if available
                                if (defined($3))
                                {
                                        $line_checksum = substr($3, 1);

                                        # Does it match a previous definition
                                        if (defined($checkdata->{$1}) &&
                                            ($checkdata->{$1} ne
                                             $line_checksum))
                                        {
                                                die("ERROR: checksum mismatch ".
                                                    "at $filename:$1\n");
                                        }

                                        $checkdata->{$1} = $line_checksum;
                                }
                                last;
                        };

                        /^FN:(\d+),([^,]+)/ && do
                        {
                                last if (!$func_coverage);

                                # Function data found, add to structure
                                $funcdata->{$2} = $1;

                                # Also initialize function call data
                                if (!defined($sumfnccount->{$2})) {
                                        $sumfnccount->{$2} = 0;
                                }
                                if (defined($testname))
                                {
                                        if (!defined($testfnccount->{$2})) {
                                                $testfnccount->{$2} = 0;
                                        }
                                }
                                last;
                        };

                        /^FNDA:(\d+),([^,]+)/ && do
                        {
                                last if (!$func_coverage);
                                # Function call count found, add to structure
                                # Add summary counts
                                $sumfnccount->{$2} += $1;

                                # Add test-specific counts
                                if (defined($testname))
                                {
                                        $testfnccount->{$2} += $1;
                                }
                                last;
                        };

                        /^BRDA:(\d+),(\d+),(\d+),(\d+|-)/ && do {
                                # Branch coverage data found
                                my ($line, $block, $branch, $taken) =
                                   ($1, $2, $3, $4);

                                last if (!$br_coverage);
                                $sumbrcount->{$line} =
                                        br_ivec_push($sumbrcount->{$line},
                                                     $block, $branch, $taken);

                                # Add test-specific counts
                                if (defined($testname)) {
                                        $testbrcount->{$line} =
                                                br_ivec_push(
                                                        $testbrcount->{$line},
                                                        $block, $branch,
                                                        $taken);
                                }
                                last;
                        };

                        /^end_of_record/ && do
                        {
                                # Found end of section marker
                                if ($filename)
                                {
                                        # Store current section data
                                        if (defined($testname))
                                        {
                                                $testdata->{$testname} =
                                                        $testcount;
                                                $testfncdata->{$testname} =
                                                        $testfnccount;
                                                $testbrdata->{$testname} =
                                                        $testbrcount;
                                        }       

                                        set_info_entry($data, $testdata,
                                                       $sumcount, $funcdata,
                                                       $checkdata, $testfncdata,
                                                       $sumfnccount,
                                                       $testbrdata,
                                                       $sumbrcount);
                                        $result{$filename} = $data;
                                        last;
                                }
                        };

                        # default
                        last;
                }
        }
        close(INFO_HANDLE);

        # Calculate lines_found and lines_hit for each file
        foreach $filename (keys(%result))
        {
                $data = $result{$filename};

                ($testdata, $sumcount, undef, undef, $testfncdata,
                 $sumfnccount, $testbrdata, $sumbrcount) =
                        get_info_entry($data);

                # Filter out empty files
                if (scalar(keys(%{$sumcount})) == 0)
                {
                        delete($result{$filename});
                        next;
                }
                # Filter out empty test cases
                foreach $testname (keys(%{$testdata}))
                {
                        if (!defined($testdata->{$testname}) ||
                            scalar(keys(%{$testdata->{$testname}})) == 0)
                        {
                                delete($testdata->{$testname});
                                delete($testfncdata->{$testname});
                        }
                }

                $data->{"found"} = scalar(keys(%{$sumcount}));
                $hitcount = 0;

                foreach (keys(%{$sumcount}))
                {
                        if ($sumcount->{$_} > 0) { $hitcount++; }
                }

                $data->{"hit"} = $hitcount;

                # Get found/hit values for function call data
                $data->{"f_found"} = scalar(keys(%{$sumfnccount}));
                $hitcount = 0;

                foreach (keys(%{$sumfnccount})) {
                        if ($sumfnccount->{$_} > 0) {
                                $hitcount++;
                        }
                }
                $data->{"f_hit"} = $hitcount;

                # Get found/hit values for branch data
                ($br_found, $br_hit) = get_br_found_and_hit($sumbrcount);

                $data->{"b_found"} = $br_found;
                $data->{"b_hit"} = $br_hit;
        }

        if (scalar(keys(%result)) == 0)
        {
                die("ERROR: no valid records found in tracefile $tracefile\n");
        }
        if ($negative)
        {
                warn("WARNING: negative counts found in tracefile ".
                     "$tracefile\n");
        }
        if ($changed_testname)
        {
                warn("WARNING: invalid characters removed from testname in ".
                     "tracefile $tracefile\n");
        }

        return(\%result);
}


#
# get_info_entry(hash_ref)
#
# Retrieve data from an entry of the structure generated by read_info_file().
# Return a list of references to hashes:
# (test data hash ref, sum count hash ref, funcdata hash ref, checkdata hash
#  ref, testfncdata hash ref, sumfnccount hash ref, lines found, lines hit,
#  functions found, functions hit)
#

sub get_info_entry($)
{
        my $testdata_ref = $_[0]->{"test"};
        my $sumcount_ref = $_[0]->{"sum"};
        my $funcdata_ref = $_[0]->{"func"};
        my $checkdata_ref = $_[0]->{"check"};
        my $testfncdata = $_[0]->{"testfnc"};
        my $sumfnccount = $_[0]->{"sumfnc"};
        my $testbrdata = $_[0]->{"testbr"};
        my $sumbrcount = $_[0]->{"sumbr"};
        my $lines_found = $_[0]->{"found"};
        my $lines_hit = $_[0]->{"hit"};
        my $fn_found = $_[0]->{"f_found"};
        my $fn_hit = $_[0]->{"f_hit"};
        my $br_found = $_[0]->{"b_found"};
        my $br_hit = $_[0]->{"b_hit"};

        return ($testdata_ref, $sumcount_ref, $funcdata_ref, $checkdata_ref,
                $testfncdata, $sumfnccount, $testbrdata, $sumbrcount,
                $lines_found, $lines_hit, $fn_found, $fn_hit,
                $br_found, $br_hit);
}


#
# set_info_entry(hash_ref, testdata_ref, sumcount_ref, funcdata_ref,
#                checkdata_ref, testfncdata_ref, sumfcncount_ref,
#                testbrdata_ref, sumbrcount_ref[,lines_found,
#                lines_hit, f_found, f_hit, $b_found, $b_hit])
#
# Update the hash referenced by HASH_REF with the provided data references.
#

sub set_info_entry($$$$$$$$$;$$$$$$)
{
        my $data_ref = $_[0];

        $data_ref->{"test"} = $_[1];
        $data_ref->{"sum"} = $_[2];
        $data_ref->{"func"} = $_[3];
        $data_ref->{"check"} = $_[4];
        $data_ref->{"testfnc"} = $_[5];
        $data_ref->{"sumfnc"} = $_[6];
        $data_ref->{"testbr"} = $_[7];
        $data_ref->{"sumbr"} = $_[8];

        if (defined($_[9])) { $data_ref->{"found"} = $_[9]; }
        if (defined($_[10])) { $data_ref->{"hit"} = $_[10]; }
        if (defined($_[11])) { $data_ref->{"f_found"} = $_[11]; }
        if (defined($_[12])) { $data_ref->{"f_hit"} = $_[12]; }
        if (defined($_[13])) { $data_ref->{"b_found"} = $_[13]; }
        if (defined($_[14])) { $data_ref->{"b_hit"} = $_[14]; }
}


#
# add_counts(data1_ref, data2_ref)
#
# DATA1_REF and DATA2_REF are references to hashes containing a mapping
#
#   line number -> execution count
#
# Return a list (RESULT_REF, LINES_FOUND, LINES_HIT) where RESULT_REF
# is a reference to a hash containing the combined mapping in which
# execution counts are added.
#

sub add_counts($$)
{
        my %data1 = %{$_[0]};   # Hash 1
        my %data2 = %{$_[1]};   # Hash 2
        my %result;             # Resulting hash
        my $line;               # Current line iteration scalar
        my $data1_count;        # Count of line in hash1
        my $data2_count;        # Count of line in hash2
        my $found = 0;          # Total number of lines found
        my $hit = 0;            # Number of lines with a count > 0

        foreach $line (keys(%data1))
        {
                $data1_count = $data1{$line};
                $data2_count = $data2{$line};

                # Add counts if present in both hashes
                if (defined($data2_count)) { $data1_count += $data2_count; }

                # Store sum in %result
                $result{$line} = $data1_count;

                $found++;
                if ($data1_count > 0) { $hit++; }
        }

        # Add lines unique to data2
        foreach $line (keys(%data2))
        {
                # Skip lines already in data1
                if (defined($data1{$line})) { next; }

                # Copy count from data2
                $result{$line} = $data2{$line};

                $found++;
                if ($result{$line} > 0) { $hit++; }
        }

        return (\%result, $found, $hit);
}


#
# merge_checksums(ref1, ref2, filename)
#
# REF1 and REF2 are references to hashes containing a mapping
#
#   line number -> checksum
#
# Merge checksum lists defined in REF1 and REF2 and return reference to
# resulting hash. Die if a checksum for a line is defined in both hashes
# but does not match.
#

sub merge_checksums($$$)
{
        my $ref1 = $_[0];
        my $ref2 = $_[1];
        my $filename = $_[2];
        my %result;
        my $line;

        foreach $line (keys(%{$ref1}))
        {
                if (defined($ref2->{$line}) &&
                    ($ref1->{$line} ne $ref2->{$line}))
                {
                        die("ERROR: checksum mismatch at $filename:$line\n");
                }
                $result{$line} = $ref1->{$line};
        }

        foreach $line (keys(%{$ref2}))
        {
                $result{$line} = $ref2->{$line};
        }

        return \%result;
}


#
# merge_func_data(funcdata1, funcdata2, filename)
#

sub merge_func_data($$$)
{
        my ($funcdata1, $funcdata2, $filename) = @_;
        my %result;
        my $func;

        if (defined($funcdata1)) {
                %result = %{$funcdata1};
        }

        foreach $func (keys(%{$funcdata2})) {
                my $line1 = $result{$func};
                my $line2 = $funcdata2->{$func};

                if (defined($line1) && ($line1 != $line2)) {
                        warn("WARNING: function data mismatch at ".
                             "$filename:$line2\n");
                        next;
                }
                $result{$func} = $line2;
        }

        return \%result;
}


#
# add_fnccount(fnccount1, fnccount2)
#
# Add function call count data. Return list (fnccount_added, f_found, f_hit)
#

sub add_fnccount($$)
{
        my ($fnccount1, $fnccount2) = @_;
        my %result;
        my $fn_found;
        my $fn_hit;
        my $function;

        if (defined($fnccount1)) {
                %result = %{$fnccount1};
        }
        foreach $function (keys(%{$fnccount2})) {
                $result{$function} += $fnccount2->{$function};
        }
        $fn_found = scalar(keys(%result));
        $fn_hit = 0;
        foreach $function (keys(%result)) {
                if ($result{$function} > 0) {
                        $fn_hit++;
                }
        }

        return (\%result, $fn_found, $fn_hit);
}

#
# add_testfncdata(testfncdata1, testfncdata2)
#
# Add function call count data for several tests. Return reference to
# added_testfncdata.
#

sub add_testfncdata($$)
{
        my ($testfncdata1, $testfncdata2) = @_;
        my %result;
        my $testname;

        foreach $testname (keys(%{$testfncdata1})) {
                if (defined($testfncdata2->{$testname})) {
                        my $fnccount;

                        # Function call count data for this testname exists
                        # in both data sets: add
                        ($fnccount) = add_fnccount(
                                $testfncdata1->{$testname},
                                $testfncdata2->{$testname});
                        $result{$testname} = $fnccount;
                        next;
                }
                # Function call count data for this testname is unique to
                # data set 1: copy
                $result{$testname} = $testfncdata1->{$testname};
        }

        # Add count data for testnames unique to data set 2
        foreach $testname (keys(%{$testfncdata2})) {
                if (!defined($result{$testname})) {
                        $result{$testname} = $testfncdata2->{$testname};
                }
        }
        return \%result;
}


#
# brcount_to_db(brcount)
#
# Convert brcount data to the following format:
#
# db:          line number    -> block hash
# block hash:  block number   -> branch hash
# branch hash: branch number  -> taken value
#

sub brcount_to_db($)
{
        my ($brcount) = @_;
        my $line;
        my $db;

        # Add branches from first count to database
        foreach $line (keys(%{$brcount})) {
                my $brdata = $brcount->{$line};
                my $i;
                my $num = br_ivec_len($brdata);

                for ($i = 0; $i < $num; $i++) {
                        my ($block, $branch, $taken) = br_ivec_get($brdata, $i);

                        $db->{$line}->{$block}->{$branch} = $taken;
                }
        }

        return $db;
}


#
# db_to_brcount(db)
#
# Convert branch coverage data back to brcount format.
#

sub db_to_brcount($)
{
        my ($db) = @_;
        my $line;
        my $brcount = {};
        my $br_found = 0;
        my $br_hit = 0;

        # Convert database back to brcount format
        foreach $line (sort({$a <=> $b} keys(%{$db}))) {
                my $ldata = $db->{$line};
                my $brdata;
                my $block;

                foreach $block (sort({$a <=> $b} keys(%{$ldata}))) {
                        my $bdata = $ldata->{$block};
                        my $branch;

                        foreach $branch (sort({$a <=> $b} keys(%{$bdata}))) {
                                my $taken = $bdata->{$branch};

                                $br_found++;
                                $br_hit++ if ($taken ne "-" && $taken > 0);
                                $brdata = br_ivec_push($brdata, $block,
                                                       $branch, $taken);
                        }
                }
                $brcount->{$line} = $brdata;
        }

        return ($brcount, $br_found, $br_hit);
}


#
# combine_brcount(brcount1, brcount2, type)
#
# If add is BR_ADD, add branch coverage data and return list (brcount_added,
# br_found, br_hit). If add is BR_SUB, subtract the taken values of brcount2
# from brcount1 and return (brcount_sub, br_found, br_hit).
#

sub combine_brcount($$$)
{
        my ($brcount1, $brcount2, $type) = @_;
        my $line;
        my $block;
        my $branch;
        my $taken;
        my $db;
        my $br_found = 0;
        my $br_hit = 0;
        my $result;

        # Convert branches from first count to database
        $db = brcount_to_db($brcount1);
        # Combine values from database and second count
        foreach $line (keys(%{$brcount2})) {
                my $brdata = $brcount2->{$line};
                my $num = br_ivec_len($brdata);
                my $i;

                for ($i = 0; $i < $num; $i++) {
                        ($block, $branch, $taken) = br_ivec_get($brdata, $i);
                        my $new_taken = $db->{$line}->{$block}->{$branch};

                        if ($type == $BR_ADD) {
                                $new_taken = br_taken_add($new_taken, $taken);
                        } elsif ($type == $BR_SUB) {
                                $new_taken = br_taken_sub($new_taken, $taken);
                        }
                        $db->{$line}->{$block}->{$branch} = $new_taken
                                if (defined($new_taken));
                }
        }
        # Convert database back to brcount format
        ($result, $br_found, $br_hit) = db_to_brcount($db);

        return ($result, $br_found, $br_hit);
}


#
# add_testbrdata(testbrdata1, testbrdata2)
#
# Add branch coverage data for several tests. Return reference to
# added_testbrdata.
#

sub add_testbrdata($$)
{
        my ($testbrdata1, $testbrdata2) = @_;
        my %result;
        my $testname;

        foreach $testname (keys(%{$testbrdata1})) {
                if (defined($testbrdata2->{$testname})) {
                        my $brcount;

                        # Branch coverage data for this testname exists
                        # in both data sets: add
                        ($brcount) = combine_brcount($testbrdata1->{$testname},
                                         $testbrdata2->{$testname}, $BR_ADD);
                        $result{$testname} = $brcount;
                        next;
                }
                # Branch coverage data for this testname is unique to
                # data set 1: copy
                $result{$testname} = $testbrdata1->{$testname};
        }

        # Add count data for testnames unique to data set 2
        foreach $testname (keys(%{$testbrdata2})) {
                if (!defined($result{$testname})) {
                        $result{$testname} = $testbrdata2->{$testname};
                }
        }
        return \%result;
}


#
# combine_info_entries(entry_ref1, entry_ref2, filename)
#
# Combine .info data entry hashes referenced by ENTRY_REF1 and ENTRY_REF2.
# Return reference to resulting hash.
#

sub combine_info_entries($$$)
{
        my $entry1 = $_[0];     # Reference to hash containing first entry
        my $testdata1;
        my $sumcount1;
        my $funcdata1;
        my $checkdata1;
        my $testfncdata1;
        my $sumfnccount1;
        my $testbrdata1;
        my $sumbrcount1;

        my $entry2 = $_[1];     # Reference to hash containing second entry
        my $testdata2;
        my $sumcount2;
        my $funcdata2;
        my $checkdata2;
        my $testfncdata2;
        my $sumfnccount2;
        my $testbrdata2;
        my $sumbrcount2;

        my %result;             # Hash containing combined entry
        my %result_testdata;
        my $result_sumcount = {};
        my $result_funcdata;
        my $result_testfncdata;
        my $result_sumfnccount;
        my $result_testbrdata;
        my $result_sumbrcount;
        my $lines_found;
        my $lines_hit;
        my $fn_found;
        my $fn_hit;
        my $br_found;
        my $br_hit;

        my $testname;
        my $filename = $_[2];

        # Retrieve data
        ($testdata1, $sumcount1, $funcdata1, $checkdata1, $testfncdata1,
         $sumfnccount1, $testbrdata1, $sumbrcount1) = get_info_entry($entry1);
        ($testdata2, $sumcount2, $funcdata2, $checkdata2, $testfncdata2,
         $sumfnccount2, $testbrdata2, $sumbrcount2) = get_info_entry($entry2);

        # Merge checksums
        $checkdata1 = merge_checksums($checkdata1, $checkdata2, $filename);

        # Combine funcdata
        $result_funcdata = merge_func_data($funcdata1, $funcdata2, $filename);

        # Combine function call count data
        $result_testfncdata = add_testfncdata($testfncdata1, $testfncdata2);
        ($result_sumfnccount, $fn_found, $fn_hit) =
                add_fnccount($sumfnccount1, $sumfnccount2);
        
        # Combine branch coverage data
        $result_testbrdata = add_testbrdata($testbrdata1, $testbrdata2);
        ($result_sumbrcount, $br_found, $br_hit) =
                combine_brcount($sumbrcount1, $sumbrcount2, $BR_ADD);

        # Combine testdata
        foreach $testname (keys(%{$testdata1}))
        {
                if (defined($testdata2->{$testname}))
                {
                        # testname is present in both entries, requires
                        # combination
                        ($result_testdata{$testname}) =
                                add_counts($testdata1->{$testname},
                                           $testdata2->{$testname});
                }
                else
                {
                        # testname only present in entry1, add to result
                        $result_testdata{$testname} = $testdata1->{$testname};
                }

                # update sum count hash
                ($result_sumcount, $lines_found, $lines_hit) =
                        add_counts($result_sumcount,
                                   $result_testdata{$testname});
        }

        foreach $testname (keys(%{$testdata2}))
        {
                # Skip testnames already covered by previous iteration
                if (defined($testdata1->{$testname})) { next; }

                # testname only present in entry2, add to result hash
                $result_testdata{$testname} = $testdata2->{$testname};

                # update sum count hash
                ($result_sumcount, $lines_found, $lines_hit) =
                        add_counts($result_sumcount,
                                   $result_testdata{$testname});
        }
        
        # Calculate resulting sumcount

        # Store result
        set_info_entry(\%result, \%result_testdata, $result_sumcount,
                       $result_funcdata, $checkdata1, $result_testfncdata,
                       $result_sumfnccount, $result_testbrdata,
                       $result_sumbrcount, $lines_found, $lines_hit,
                       $fn_found, $fn_hit, $br_found, $br_hit);

        return(\%result);
}


#
# combine_info_files(info_ref1, info_ref2)
#
# Combine .info data in hashes referenced by INFO_REF1 and INFO_REF2. Return
# reference to resulting hash.
#

sub combine_info_files($$)
{
        my %hash1 = %{$_[0]};
        my %hash2 = %{$_[1]};
        my $filename;

        foreach $filename (keys(%hash2))
        {
                if ($hash1{$filename})
                {
                        # Entry already exists in hash1, combine them
                        $hash1{$filename} =
                                combine_info_entries($hash1{$filename},
                                                     $hash2{$filename},
                                                     $filename);
                }
                else
                {
                        # Entry is unique in both hashes, simply add to
                        # resulting hash
                        $hash1{$filename} = $hash2{$filename};
                }
        }

        return(\%hash1);
}


#
# get_prefix(min_dir, filename_list)
#
# Search FILENAME_LIST for a directory prefix which is common to as many
# list entries as possible, so that removing this prefix will minimize the
# sum of the lengths of all resulting shortened filenames while observing
# that no filename has less than MIN_DIR parent directories.
#

sub get_prefix($@)
{
        my ($min_dir, @filename_list) = @_;
        my %prefix;                     # mapping: prefix -> sum of lengths
        my $current;                    # Temporary iteration variable

        # Find list of prefixes
        foreach (@filename_list)
        {
                # Need explicit assignment to get a copy of $_ so that
                # shortening the contained prefix does not affect the list
                $current = $_;
                while ($current = shorten_prefix($current))
                {
                        $current .= "/";

                        # Skip rest if the remaining prefix has already been
                        # added to hash
                        if (exists($prefix{$current})) { last; }

                        # Initialize with 0
                        $prefix{$current}="0";
                }

        }

        # Remove all prefixes that would cause filenames to have less than
        # the minimum number of parent directories
        foreach my $filename (@filename_list) {
                my $dir = dirname($filename);

                for (my $i = 0; $i < $min_dir; $i++) {
                        delete($prefix{$dir."/"});
                        $dir = shorten_prefix($dir);
                }
        }

        # Check if any prefix remains
        return undef if (!%prefix);

        # Calculate sum of lengths for all prefixes
        foreach $current (keys(%prefix))
        {
                foreach (@filename_list)
                {
                        # Add original length
                        $prefix{$current} += length($_);

                        # Check whether prefix matches
                        if (substr($_, 0, length($current)) eq $current)
                        {
                                # Subtract prefix length for this filename
                                $prefix{$current} -= length($current);
                        }
                }
        }

        # Find and return prefix with minimal sum
        $current = (keys(%prefix))[0];

        foreach (keys(%prefix))
        {
                if ($prefix{$_} < $prefix{$current})
                {
                        $current = $_;
                }
        }

        $current =~ s/\/$//;

        return($current);
}


#
# shorten_prefix(prefix)
#
# Return PREFIX shortened by last directory component.
#

sub shorten_prefix($)
{
        my @list = split("/", $_[0]);

        pop(@list);
        return join("/", @list);
}



#
# get_dir_list(filename_list)
#
# Return sorted list of directories for each entry in given FILENAME_LIST.
#

sub get_dir_list(@)
{
        my %result;

        foreach (@_)
        {
                $result{shorten_prefix($_)} = "";
        }

        return(sort(keys(%result)));
}


#
# get_relative_base_path(subdirectory)
#
# Return a relative path string which references the base path when applied
# in SUBDIRECTORY.
#
# Example: get_relative_base_path("fs/mm") -> "../../"
#

sub get_relative_base_path($)
{
        my $result = "";
        my $index;

        # Make an empty directory path a special case
        if (!$_[0]) { return(""); }

        # Count number of /s in path
        $index = ($_[0] =~ s/\//\//g);

        # Add a ../ to $result for each / in the directory path + 1
        for (; $index>=0; $index--)
        {
                $result .= "../";
        }

        return $result;
}


#
# read_testfile(test_filename)
#
# Read in file TEST_FILENAME which contains test descriptions in the format:
#
#   TN:<whitespace><test name>
#   TD:<whitespace><test description>
#
# for each test case. Return a reference to a hash containing a mapping
#
#   test name -> test description.
#
# Die on error.
#

sub read_testfile($)
{
        my %result;
        my $test_name;
        my $changed_testname;
        local *TEST_HANDLE;

        open(TEST_HANDLE, "<", $_[0])
                or die("ERROR: cannot open $_[0]!\n");

        while (<TEST_HANDLE>)
        {
                chomp($_);

                # Match lines beginning with TN:<whitespace(s)>
                if (/^TN:\s+(.*?)\s*$/)
                {
                        # Store name for later use
                        $test_name = $1;
                        if ($test_name =~ s/\W/_/g)
                        {
                                $changed_testname = 1;
                        }
                }

                # Match lines beginning with TD:<whitespace(s)>
                if (/^TD:\s+(.*?)\s*$/)
                {
                        # Check for empty line
                        if ($1)
                        {
                                # Add description to hash
                                $result{$test_name} .= " $1";
                        }
                        else
                        {
                                # Add empty line
                                $result{$test_name} .= "\n\n";
                        }
                }
        }

        close(TEST_HANDLE);

        if ($changed_testname)
        {
                warn("WARNING: invalid characters removed from testname in ".
                     "descriptions file $_[0]\n");
        }

        return \%result;
}


#
# escape_html(STRING)
#
# Return a copy of STRING in which all occurrences of HTML special characters
# are escaped.
#

sub escape_html($)
{
        my $string = $_[0];

        if (!$string) { return ""; }

        $string =~ s/&/&amp;/g;         # & -> &amp;
        $string =~ s/</&lt;/g;          # < -> &lt;
        $string =~ s/>/&gt;/g;          # > -> &gt;
        $string =~ s/\"/&quot;/g;       # " -> &quot;

        while ($string =~ /^([^\t]*)(\t)/)
        {
                my $replacement = " "x($tab_size - (length($1) % $tab_size));
                $string =~ s/^([^\t]*)(\t)/$1$replacement/;
        }

        $string =~ s/\n/<br>/g;         # \n -> <br>

        return $string;
}


#
# get_date_string()
#
# Return the current date in the form: yyyy-mm-dd
#

sub get_date_string()
{
        my $year;
        my $month;
        my $day;

        ($year, $month, $day) = (localtime())[5, 4, 3];

        return sprintf("%d-%02d-%02d", $year+1900, $month+1, $day);
}


#
# create_sub_dir(dir_name)
#
# Create subdirectory DIR_NAME if it does not already exist, including all its
# parent directories.
#
# Die on error.
#

sub create_sub_dir($)
{
        my ($dir) = @_;

        system("mkdir", "-p" ,$dir)
                and die("ERROR: cannot create directory $dir!\n");
}


#
# write_description_file(descriptions, overall_found, overall_hit,
#                        total_fn_found, total_fn_hit, total_br_found,
#                        total_br_hit)
#
# Write HTML file containing all test case descriptions. DESCRIPTIONS is a
# reference to a hash containing a mapping
#
#   test case name -> test case description
#
# Die on error.
#

sub write_description_file($$$$$$$)
{
        my %description = %{$_[0]};
        my $found = $_[1];
        my $hit = $_[2];
        my $fn_found = $_[3];
        my $fn_hit = $_[4];
        my $br_found = $_[5];
        my $br_hit = $_[6];
        my $test_name;
        local *HTML_HANDLE;

        html_create(*HTML_HANDLE,"descriptions.$html_ext");
        write_html_prolog(*HTML_HANDLE, "", "LCOV - test case descriptions");
        write_header(*HTML_HANDLE, 3, "", "", $found, $hit, $fn_found,
                     $fn_hit, $br_found, $br_hit, 0);

        write_test_table_prolog(*HTML_HANDLE,
                         "Test case descriptions - alphabetical list");

        foreach $test_name (sort(keys(%description)))
        {
                write_test_table_entry(*HTML_HANDLE, $test_name,
                                       escape_html($description{$test_name}));
        }

        write_test_table_epilog(*HTML_HANDLE);
        write_html_epilog(*HTML_HANDLE, "");

        close(*HTML_HANDLE);
}



#
# write_png_files()
#
# Create all necessary .png files for the HTML-output in the current
# directory. .png-files are used as bar graphs.
#
# Die on error.
#

sub write_png_files()
{
        my %data;
        local *PNG_HANDLE;

        $data{"ruby.png"} =
                [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 
                 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x01, 
                 0x00, 0x00, 0x00, 0x01, 0x01, 0x03, 0x00, 0x00, 0x00, 0x25, 
                 0xdb, 0x56, 0xca, 0x00, 0x00, 0x00, 0x07, 0x74, 0x49, 0x4d, 
                 0x45, 0x07, 0xd2, 0x07, 0x11, 0x0f, 0x18, 0x10, 0x5d, 0x57, 
                 0x34, 0x6e, 0x00, 0x00, 0x00, 0x09, 0x70, 0x48, 0x59, 0x73, 
                 0x00, 0x00, 0x0b, 0x12, 0x00, 0x00, 0x0b, 0x12, 0x01, 0xd2, 
                 0xdd, 0x7e, 0xfc, 0x00, 0x00, 0x00, 0x04, 0x67, 0x41, 0x4d, 
                 0x41, 0x00, 0x00, 0xb1, 0x8f, 0x0b, 0xfc, 0x61, 0x05, 0x00, 
                 0x00, 0x00, 0x06, 0x50, 0x4c, 0x54, 0x45, 0xff, 0x35, 0x2f, 
                 0x00, 0x00, 0x00, 0xd0, 0x33, 0x9a, 0x9d, 0x00, 0x00, 0x00, 
                 0x0a, 0x49, 0x44, 0x41, 0x54, 0x78, 0xda, 0x63, 0x60, 0x00, 
                 0x00, 0x00, 0x02, 0x00, 0x01, 0xe5, 0x27, 0xde, 0xfc, 0x00, 
                 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 
                 0x82];
        $data{"amber.png"} =
                [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 
                 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x01, 
                 0x00, 0x00, 0x00, 0x01, 0x01, 0x03, 0x00, 0x00, 0x00, 0x25, 
                 0xdb, 0x56, 0xca, 0x00, 0x00, 0x00, 0x07, 0x74, 0x49, 0x4d, 
                 0x45, 0x07, 0xd2, 0x07, 0x11, 0x0f, 0x28, 0x04, 0x98, 0xcb, 
                 0xd6, 0xe0, 0x00, 0x00, 0x00, 0x09, 0x70, 0x48, 0x59, 0x73, 
                 0x00, 0x00, 0x0b, 0x12, 0x00, 0x00, 0x0b, 0x12, 0x01, 0xd2, 
                 0xdd, 0x7e, 0xfc, 0x00, 0x00, 0x00, 0x04, 0x67, 0x41, 0x4d, 
                 0x41, 0x00, 0x00, 0xb1, 0x8f, 0x0b, 0xfc, 0x61, 0x05, 0x00, 
                 0x00, 0x00, 0x06, 0x50, 0x4c, 0x54, 0x45, 0xff, 0xe0, 0x50, 
                 0x00, 0x00, 0x00, 0xa2, 0x7a, 0xda, 0x7e, 0x00, 0x00, 0x00, 
                 0x0a, 0x49, 0x44, 0x41, 0x54, 0x78, 0xda, 0x63, 0x60, 0x00, 
                 0x00, 0x00, 0x02, 0x00, 0x01, 0xe5, 0x27, 0xde, 0xfc, 0x00, 
                 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 
                 0x82];
        $data{"emerald.png"} =
                [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 
                 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x01, 
                 0x00, 0x00, 0x00, 0x01, 0x01, 0x03, 0x00, 0x00, 0x00, 0x25, 
                 0xdb, 0x56, 0xca, 0x00, 0x00, 0x00, 0x07, 0x74, 0x49, 0x4d, 
                 0x45, 0x07, 0xd2, 0x07, 0x11, 0x0f, 0x22, 0x2b, 0xc9, 0xf5, 
                 0x03, 0x33, 0x00, 0x00, 0x00, 0x09, 0x70, 0x48, 0x59, 0x73, 
                 0x00, 0x00, 0x0b, 0x12, 0x00, 0x00, 0x0b, 0x12, 0x01, 0xd2, 
                 0xdd, 0x7e, 0xfc, 0x00, 0x00, 0x00, 0x04, 0x67, 0x41, 0x4d, 
                 0x41, 0x00, 0x00, 0xb1, 0x8f, 0x0b, 0xfc, 0x61, 0x05, 0x00, 
                 0x00, 0x00, 0x06, 0x50, 0x4c, 0x54, 0x45, 0x1b, 0xea, 0x59, 
                 0x0a, 0x0a, 0x0a, 0x0f, 0xba, 0x50, 0x83, 0x00, 0x00, 0x00, 
                 0x0a, 0x49, 0x44, 0x41, 0x54, 0x78, 0xda, 0x63, 0x60, 0x00, 
                 0x00, 0x00, 0x02, 0x00, 0x01, 0xe5, 0x27, 0xde, 0xfc, 0x00, 
                 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 
                 0x82];
        $data{"snow.png"} =
                [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 
                 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x01, 
                 0x00, 0x00, 0x00, 0x01, 0x01, 0x03, 0x00, 0x00, 0x00, 0x25, 
                 0xdb, 0x56, 0xca, 0x00, 0x00, 0x00, 0x07, 0x74, 0x49, 0x4d, 
                 0x45, 0x07, 0xd2, 0x07, 0x11, 0x0f, 0x1e, 0x1d, 0x75, 0xbc, 
                 0xef, 0x55, 0x00, 0x00, 0x00, 0x09, 0x70, 0x48, 0x59, 0x73, 
                 0x00, 0x00, 0x0b, 0x12, 0x00, 0x00, 0x0b, 0x12, 0x01, 0xd2, 
                 0xdd, 0x7e, 0xfc, 0x00, 0x00, 0x00, 0x04, 0x67, 0x41, 0x4d, 
                 0x41, 0x00, 0x00, 0xb1, 0x8f, 0x0b, 0xfc, 0x61, 0x05, 0x00, 
                 0x00, 0x00, 0x06, 0x50, 0x4c, 0x54, 0x45, 0xff, 0xff, 0xff, 
                 0x00, 0x00, 0x00, 0x55, 0xc2, 0xd3, 0x7e, 0x00, 0x00, 0x00, 
                 0x0a, 0x49, 0x44, 0x41, 0x54, 0x78, 0xda, 0x63, 0x60, 0x00, 
                 0x00, 0x00, 0x02, 0x00, 0x01, 0xe5, 0x27, 0xde, 0xfc, 0x00, 
                 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 
                 0x82];
        $data{"glass.png"} =
                [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 
                 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x01, 
                 0x00, 0x00, 0x00, 0x01, 0x01, 0x03, 0x00, 0x00, 0x00, 0x25, 
                 0xdb, 0x56, 0xca, 0x00, 0x00, 0x00, 0x04, 0x67, 0x41, 0x4d, 
                 0x41, 0x00, 0x00, 0xb1, 0x8f, 0x0b, 0xfc, 0x61, 0x05, 0x00, 
                 0x00, 0x00, 0x06, 0x50, 0x4c, 0x54, 0x45, 0xff, 0xff, 0xff, 
                 0x00, 0x00, 0x00, 0x55, 0xc2, 0xd3, 0x7e, 0x00, 0x00, 0x00, 
                 0x01, 0x74, 0x52, 0x4e, 0x53, 0x00, 0x40, 0xe6, 0xd8, 0x66, 
                 0x00, 0x00, 0x00, 0x01, 0x62, 0x4b, 0x47, 0x44, 0x00, 0x88, 
                 0x05, 0x1d, 0x48, 0x00, 0x00, 0x00, 0x09, 0x70, 0x48, 0x59, 
                 0x73, 0x00, 0x00, 0x0b, 0x12, 0x00, 0x00, 0x0b, 0x12, 0x01, 
                 0xd2, 0xdd, 0x7e, 0xfc, 0x00, 0x00, 0x00, 0x07, 0x74, 0x49, 
                 0x4d, 0x45, 0x07, 0xd2, 0x07, 0x13, 0x0f, 0x08, 0x19, 0xc4, 
                 0x40, 0x56, 0x10, 0x00, 0x00, 0x00, 0x0a, 0x49, 0x44, 0x41, 
                 0x54, 0x78, 0x9c, 0x63, 0x60, 0x00, 0x00, 0x00, 0x02, 0x00, 
                 0x01, 0x48, 0xaf, 0xa4, 0x71, 0x00, 0x00, 0x00, 0x00, 0x49, 
                 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82];
        $data{"updown.png"} =
                [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 
                 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x0a, 
                 0x00, 0x00, 0x00, 0x0e, 0x08, 0x06, 0x00, 0x00, 0x00, 0x16, 
                 0xa3, 0x8d, 0xab, 0x00, 0x00, 0x00, 0x3c, 0x49, 0x44, 0x41, 
                 0x54, 0x28, 0xcf, 0x63, 0x60, 0x40, 0x03, 0xff, 0xa1, 0x00, 
                 0x5d, 0x9c, 0x11, 0x5d, 0x11, 0x8a, 0x24, 0x23, 0x23, 0x23, 
                 0x86, 0x42, 0x6c, 0xa6, 0x20, 0x2b, 0x66, 0xc4, 0xa7, 0x08, 
                 0x59, 0x31, 0x23, 0x21, 0x45, 0x30, 0xc0, 0xc4, 0x30, 0x60, 
                 0x80, 0xfa, 0x6e, 0x24, 0x3e, 0x78, 0x48, 0x0a, 0x70, 0x62, 
                 0xa2, 0x90, 0x81, 0xd8, 0x44, 0x01, 0x00, 0xe9, 0x5c, 0x2f, 
                 0xf5, 0xe2, 0x9d, 0x0f, 0xf9, 0x00, 0x00, 0x00, 0x00, 0x49, 
                 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82] if ($sort);
        foreach (keys(%data))
        {
                open(PNG_HANDLE, ">", $_)
                        or die("ERROR: cannot create $_!\n");
                binmode(PNG_HANDLE);
                print(PNG_HANDLE map(chr,@{$data{$_}}));
                close(PNG_HANDLE);
        }
}


#
# write_htaccess_file()
#

sub write_htaccess_file()
{
        local *HTACCESS_HANDLE;
        my $htaccess_data;

        open(*HTACCESS_HANDLE, ">", ".htaccess")
                or die("ERROR: cannot open .htaccess for writing!\n");

        $htaccess_data = (<<"END_OF_HTACCESS")
AddEncoding x-gzip .html
END_OF_HTACCESS
        ;

        print(HTACCESS_HANDLE $htaccess_data);
        close(*HTACCESS_HANDLE);
}


#
# write_css_file()
#
# Write the cascading style sheet file gcov.css to the current directory.
# This file defines basic layout attributes of all generated HTML pages.
#

sub write_css_file()
{
        local *CSS_HANDLE;

        # Check for a specified external style sheet file
        if ($css_filename)
        {
                # Simply copy that file
                system("cp", $css_filename, "gcov.css")
                        and die("ERROR: cannot copy file $css_filename!\n");
                return;
        }

        open(CSS_HANDLE, ">", "gcov.css")
                or die ("ERROR: cannot open gcov.css for writing!\n");


        # *************************************************************

        my $css_data = ($_=<<"END_OF_CSS")
        /* All views: initial background and text color */
        body
        {
          color: #000000;
          background-color: #FFFFFF;
        }
        
        /* All views: standard link format*/
        a:link
        {
          color: #284FA8;
          text-decoration: underline;
        }
        
        /* All views: standard link - visited format */
        a:visited
        {
          color: #00CB40;
          text-decoration: underline;
        }
        
        /* All views: standard link - activated format */
        a:active
        {
          color: #FF0040;
          text-decoration: underline;
        }
        
        /* All views: main title format */
        td.title
        {
          text-align: center;
          padding-bottom: 10px;
          font-family: sans-serif;
          font-size: 20pt;
          font-style: italic;
          font-weight: bold;
        }
        
        /* All views: header item format */
        td.headerItem
        {
          text-align: right;
          padding-right: 6px;
          font-family: sans-serif;
          font-weight: bold;
          vertical-align: top;
          white-space: nowrap;
        }
        
        /* All views: header item value format */
        td.headerValue
        {
          text-align: left;
          color: #284FA8;
          font-family: sans-serif;
          font-weight: bold;
          white-space: nowrap;
        }

        /* All views: header item coverage table heading */
        td.headerCovTableHead
        {
          text-align: center;
          padding-right: 6px;
          padding-left: 6px;
          padding-bottom: 0px;
          font-family: sans-serif;
          font-size: 80%;
          white-space: nowrap;
        }
        
        /* All views: header item coverage table entry */
        td.headerCovTableEntry
        {
          text-align: right;
          color: #284FA8;
          font-family: sans-serif;
          font-weight: bold;
          white-space: nowrap;
          padding-left: 12px;
          padding-right: 4px;
          background-color: #DAE7FE;
        }
        
        /* All views: header item coverage table entry for high coverage rate */
        td.headerCovTableEntryHi
        {
          text-align: right;
          color: #000000;
          font-family: sans-serif;
          font-weight: bold;
          white-space: nowrap;
          padding-left: 12px;
          padding-right: 4px;
          background-color: #A7FC9D;
        }
        
        /* All views: header item coverage table entry for medium coverage rate */
        td.headerCovTableEntryMed
        {
          text-align: right;
          color: #000000;
          font-family: sans-serif;
          font-weight: bold;
          white-space: nowrap;
          padding-left: 12px;
          padding-right: 4px;
          background-color: #FFEA20;
        }
        
        /* All views: header item coverage table entry for ow coverage rate */
        td.headerCovTableEntryLo
        {
          text-align: right;
          color: #000000;
          font-family: sans-serif;
          font-weight: bold;
          white-space: nowrap;
          padding-left: 12px;
          padding-right: 4px;
          background-color: #FF0000;
        }
        
        /* All views: header legend value for legend entry */
        td.headerValueLeg
        {
          text-align: left;
          color: #000000;
          font-family: sans-serif;
          font-size: 80%;
          white-space: nowrap;
          padding-top: 4px;
        }
        
        /* All views: color of horizontal ruler */
        td.ruler
        {
          background-color: #6688D4;
        }
        
        /* All views: version string format */
        td.versionInfo
        {
          text-align: center;
          padding-top: 2px;
          font-family: sans-serif;
          font-style: italic;
        }
        
        /* Directory view/File view (all)/Test case descriptions:
           table headline format */
        td.tableHead
        {
          text-align: center;
          color: #FFFFFF;
          background-color: #6688D4;
          font-family: sans-serif;
          font-size: 120%;
          font-weight: bold;
          white-space: nowrap;
          padding-left: 4px;
          padding-right: 4px;
        }

        span.tableHeadSort
        {
          padding-right: 4px;
        }
        
        /* Directory view/File view (all): filename entry format */
        td.coverFile
        {
          text-align: left;
          padding-left: 10px;
          padding-right: 20px; 
          color: #284FA8;
          background-color: #DAE7FE;
          font-family: monospace;
        }
        
        /* Directory view/File view (all): bar-graph entry format*/
        td.coverBar
        {
          padding-left: 10px;
          padding-right: 10px;
          background-color: #DAE7FE;
        }
        
        /* Directory view/File view (all): bar-graph outline color */
        td.coverBarOutline
        {
          background-color: #000000;
        }
        
        /* Directory view/File view (all): percentage entry for files with
           high coverage rate */
        td.coverPerHi
        {
          text-align: right;
          padding-left: 10px;
          padding-right: 10px;
          background-color: #A7FC9D;
          font-weight: bold;
          font-family: sans-serif;
        }
        
        /* Directory view/File view (all): line count entry for files with
           high coverage rate */
        td.coverNumHi
        {
          text-align: right;
          padding-left: 10px;
          padding-right: 10px;
          background-color: #A7FC9D;
          white-space: nowrap;
          font-family: sans-serif;
        }
        
        /* Directory view/File view (all): percentage entry for files with
           medium coverage rate */
        td.coverPerMed
        {
          text-align: right;
          padding-left: 10px;
          padding-right: 10px;
          background-color: #FFEA20;
          font-weight: bold;
          font-family: sans-serif;
        }
        
        /* Directory view/File view (all): line count entry for files with
           medium coverage rate */
        td.coverNumMed
        {
          text-align: right;
          padding-left: 10px;
          padding-right: 10px;
          background-color: #FFEA20;
          white-space: nowrap;
          font-family: sans-serif;
        }
        
        /* Directory view/File view (all): percentage entry for files with
           low coverage rate */
        td.coverPerLo
        {
          text-align: right;
          padding-left: 10px;
          padding-right: 10px;
          background-color: #FF0000;
          font-weight: bold;
          font-family: sans-serif;
        }
        
        /* Directory view/File view (all): line count entry for files with
           low coverage rate */
        td.coverNumLo
        {
          text-align: right;
          padding-left: 10px;
          padding-right: 10px;
          background-color: #FF0000;
          white-space: nowrap;
          font-family: sans-serif;
        }
        
        /* File view (all): "show/hide details" link format */
        a.detail:link
        {
          color: #B8D0FF;
          font-size:80%;
        }
        
        /* File view (all): "show/hide details" link - visited format */
        a.detail:visited
        {
          color: #B8D0FF;
          font-size:80%;
        }
        
        /* File view (all): "show/hide details" link - activated format */
        a.detail:active
        {
          color: #FFFFFF;
          font-size:80%;
        }
        
        /* File view (detail): test name entry */
        td.testName
        {
          text-align: right;
          padding-right: 10px;
          background-color: #DAE7FE;
          font-family: sans-serif;
        }
        
        /* File view (detail): test percentage entry */
        td.testPer
        {
          text-align: right;
          padding-left: 10px;
          padding-right: 10px; 
          background-color: #DAE7FE;
          font-family: sans-serif;
        }
        
        /* File view (detail): test lines count entry */
        td.testNum
        {
          text-align: right;
          padding-left: 10px;
          padding-right: 10px; 
          background-color: #DAE7FE;
          font-family: sans-serif;
        }
        
        /* Test case descriptions: test name format*/
        dt
        {
          font-family: sans-serif;
          font-weight: bold;
        }
        
        /* Test case descriptions: description table body */
        td.testDescription
        {
          padding-top: 10px;
          padding-left: 30px;
          padding-bottom: 10px;
          padding-right: 30px;
          background-color: #DAE7FE;
        }
        
        /* Source code view: function entry */
        td.coverFn
        {
          text-align: left;
          padding-left: 10px;
          padding-right: 20px; 
          color: #284FA8;
          background-color: #DAE7FE;
          font-family: monospace;
        }

        /* Source code view: function entry zero count*/
        td.coverFnLo
        {
          text-align: right;
          padding-left: 10px;
          padding-right: 10px;
          background-color: #FF0000;
          font-weight: bold;
          font-family: sans-serif;
        }

        /* Source code view: function entry nonzero count*/
        td.coverFnHi
        {
          text-align: right;
          padding-left: 10px;
          padding-right: 10px;
          background-color: #DAE7FE;
          font-weight: bold;
          font-family: sans-serif;
        }

        /* Source code view: source code format */
        pre.source
        {
          font-family: monospace;
          white-space: pre;
          margin-top: 2px;
        }
        
        /* Source code view: line number format */
        span.lineNum
        {
          background-color: #EFE383;
        }
        
        /* Source code view: format for lines which were executed */
        td.lineCov,
        span.lineCov
        {
          background-color: #CAD7FE;
        }
        
        /* Source code view: format for Cov legend */
        span.coverLegendCov
        {
          padding-left: 10px;
          padding-right: 10px;
          padding-bottom: 2px;
          background-color: #CAD7FE;
        }
        
        /* Source code view: format for lines which were not executed */
        td.lineNoCov,
        span.lineNoCov
        {
          background-color: #FF6230;
        }
        
        /* Source code view: format for NoCov legend */
        span.coverLegendNoCov
        {
          padding-left: 10px;
          padding-right: 10px;
          padding-bottom: 2px;
          background-color: #FF6230;
        }
        
        /* Source code view (function table): standard link - visited format */
        td.lineNoCov > a:visited,
        td.lineCov > a:visited
        {  
          color: black;
          text-decoration: underline;
        }  
        
        /* Source code view: format for lines which were executed only in a
           previous version */
        span.lineDiffCov
        {
          background-color: #B5F7AF;
        }
        
        /* Source code view: format for branches which were executed
         * and taken */
        span.branchCov
        {
          background-color: #CAD7FE;
        }

        /* Source code view: format for branches which were executed
         * but not taken */
        span.branchNoCov
        {
          background-color: #FF6230;
        }

        /* Source code view: format for branches which were not executed */
        span.branchNoExec
        {
          background-color: #FF6230;
        }

        /* Source code view: format for the source code heading line */
        pre.sourceHeading
        {
          white-space: pre;
          font-family: monospace;
          font-weight: bold;
          margin: 0px;
        }

        /* All views: header legend value for low rate */
        td.headerValueLegL
        {
          font-family: sans-serif;
          text-align: center;
          white-space: nowrap;
          padding-left: 4px;
          padding-right: 2px;
          background-color: #FF0000;
          font-size: 80%;
        }

        /* All views: header legend value for med rate */
        td.headerValueLegM
        {
          font-family: sans-serif;
          text-align: center;
          white-space: nowrap;
          padding-left: 2px;
          padding-right: 2px;
          background-color: #FFEA20;
          font-size: 80%;
        }

        /* All views: header legend value for hi rate */
        td.headerValueLegH
        {
          font-family: sans-serif;
          text-align: center;
          white-space: nowrap;
          padding-left: 2px;
          padding-right: 4px;
          background-color: #A7FC9D;
          font-size: 80%;
        }

        /* All views except source code view: legend format for low coverage */
        span.coverLegendCovLo
        {
          padding-left: 10px;
          padding-right: 10px;
          padding-top: 2px;
          background-color: #FF0000;
        }

        /* All views except source code view: legend format for med coverage */
        span.coverLegendCovMed
        {
          padding-left: 10px;
          padding-right: 10px;
          padding-top: 2px;
          background-color: #FFEA20;
        }

        /* All views except source code view: legend format for hi coverage */
        span.coverLegendCovHi
        {
          padding-left: 10px;
          padding-right: 10px;
          padding-top: 2px;
          background-color: #A7FC9D;
        }
END_OF_CSS
        ;

        # *************************************************************


        # Remove leading tab from all lines
        $css_data =~ s/^\t//gm;

        print(CSS_HANDLE $css_data);

        close(CSS_HANDLE);
}


#
# get_bar_graph_code(base_dir, cover_found, cover_hit)
#
# Return a string containing HTML code which implements a bar graph display
# for a coverage rate of cover_hit * 100 / cover_found.
#

sub get_bar_graph_code($$$)
{
        my ($base_dir, $found, $hit) = @_;
        my $rate;
        my $alt;
        my $width;
        my $remainder;
        my $png_name;
        my $graph_code;

        # Check number of instrumented lines
        if ($_[1] == 0) { return ""; }

        $alt            = rate($hit, $found, "%");
        $width          = rate($hit, $found, undef, 0);
        $remainder      = 100 - $width;

        # Decide which .png file to use
        $png_name = $rate_png[classify_rate($found, $hit, $med_limit,
                                            $hi_limit)];

        if ($width == 0)
        {
                # Zero coverage
                $graph_code = (<<END_OF_HTML)
                <table border=0 cellspacing=0 cellpadding=1><tr><td class="coverBarOutline"><img src="$_[0]snow.png" width=100 height=10 alt="$alt"></td></tr></table>
END_OF_HTML
                ;
        }
        elsif ($width == 100)
        {
                # Full coverage
                $graph_code = (<<END_OF_HTML)
                <table border=0 cellspacing=0 cellpadding=1><tr><td class="coverBarOutline"><img src="$_[0]$png_name" width=100 height=10 alt="$alt"></td></tr></table>
END_OF_HTML
                ;
        }
        else
        {
                # Positive coverage
                $graph_code = (<<END_OF_HTML)
                <table border=0 cellspacing=0 cellpadding=1><tr><td class="coverBarOutline"><img src="$_[0]$png_name" width=$width height=10 alt="$alt"><img src="$_[0]snow.png" width=$remainder height=10 alt="$alt"></td></tr></table>
END_OF_HTML
                ;
        }

        # Remove leading tabs from all lines
        $graph_code =~ s/^\t+//gm;
        chomp($graph_code);

        return($graph_code);
}

#
# sub classify_rate(found, hit, med_limit, high_limit)
#
# Return 0 for low rate, 1 for medium rate and 2 for hi rate.
#

sub classify_rate($$$$)
{
        my ($found, $hit, $med, $hi) = @_;
        my $rate;

        if ($found == 0) {
                return 2;
        }
        $rate = rate($hit, $found);
        if ($rate < $med) {
                return 0;
        } elsif ($rate < $hi) {
                return 1;
        }
        return 2;
}


#
# write_html(filehandle, html_code)
#
# Write out HTML_CODE to FILEHANDLE while removing a leading tabulator mark
# in each line of HTML_CODE.
#

sub write_html(*$)
{
        local *HTML_HANDLE = $_[0];
        my $html_code = $_[1];

        # Remove leading tab from all lines
        $html_code =~ s/^\t//gm;

        print(HTML_HANDLE $html_code)
                or die("ERROR: cannot write HTML data ($!)\n");
}


#
# write_html_prolog(filehandle, base_dir, pagetitle)
#
# Write an HTML prolog common to all HTML files to FILEHANDLE. PAGETITLE will
# be used as HTML page title. BASE_DIR contains a relative path which points
# to the base directory.
#

sub write_html_prolog(*$$)
{
        my $basedir = $_[1];
        my $pagetitle = $_[2];
        my $prolog;

        $prolog = $html_prolog;
        $prolog =~ s/\@pagetitle\@/$pagetitle/g;
        $prolog =~ s/\@basedir\@/$basedir/g;

        write_html($_[0], $prolog);
}


#
# write_header_prolog(filehandle, base_dir)
#
# Write beginning of page header HTML code.
#

sub write_header_prolog(*$)
{
        # *************************************************************

        write_html($_[0], <<END_OF_HTML)
          <table width="100%" border=0 cellspacing=0 cellpadding=0>
            <tr><td class="title">$title</td></tr>
            <tr><td class="ruler"><img src="$_[1]glass.png" width=3 height=3 alt=""></td></tr>

            <tr>
              <td width="100%">
                <table cellpadding=1 border=0 width="100%">
END_OF_HTML
        ;

        # *************************************************************
}


#
# write_header_line(handle, content)
#
# Write a header line with the specified table contents.
#

sub write_header_line(*@)
{
        my ($handle, @content) = @_;
        my $entry;

        write_html($handle, "          <tr>\n");
        foreach $entry (@content) {
                my ($width, $class, $text, $colspan) = @{$entry};

                if (defined($width)) {
                        $width = " width=\"$width\"";
                } else {
                        $width = "";
                }
                if (defined($class)) {
                        $class = " class=\"$class\"";
                } else {
                        $class = "";
                }
                if (defined($colspan)) {
                        $colspan = " colspan=\"$colspan\"";
                } else {
                        $colspan = "";
                }
                $text = "" if (!defined($text));
                write_html($handle,
                           "            <td$width$class$colspan>$text</td>\n");
        }
        write_html($handle, "          </tr>\n");
}


#
# write_header_epilog(filehandle, base_dir)
#
# Write end of page header HTML code.
#

sub write_header_epilog(*$)
{
        # *************************************************************

        write_html($_[0], <<END_OF_HTML)
                  <tr><td><img src="$_[1]glass.png" width=3 height=3 alt=""></td></tr>
                </table>
              </td>
            </tr>

            <tr><td class="ruler"><img src="$_[1]glass.png" width=3 height=3 alt=""></td></tr>
          </table>

END_OF_HTML
        ;

        # *************************************************************
}


#
# write_file_table_prolog(handle, file_heading, ([heading, num_cols], ...))
#
# Write heading for file table.
#

sub write_file_table_prolog(*$@)
{
        my ($handle, $file_heading, @columns) = @_;
        my $num_columns = 0;
        my $file_width;
        my $col;
        my $width;

        $width = 20 if (scalar(@columns) == 1);
        $width = 10 if (scalar(@columns) == 2);
        $width = 8 if (scalar(@columns) > 2);

        foreach $col (@columns) {
                my ($heading, $cols) = @{$col};

                $num_columns += $cols;
        }
        $file_width = 100 - $num_columns * $width;

        # Table definition
        write_html($handle, <<END_OF_HTML);
          <center>
          <table width="80%" cellpadding=1 cellspacing=1 border=0>

            <tr>
              <td width="$file_width%"><br></td>
END_OF_HTML
        # Empty first row
        foreach $col (@columns) {
                my ($heading, $cols) = @{$col};

                while ($cols-- > 0) {
                        write_html($handle, <<END_OF_HTML);
              <td width="$width%"></td>
END_OF_HTML
                }
        }
        # Next row
        write_html($handle, <<END_OF_HTML);
            </tr>

            <tr>
              <td class="tableHead">$file_heading</td>
END_OF_HTML
        # Heading row
        foreach $col (@columns) {
                my ($heading, $cols) = @{$col};
                my $colspan = "";

                $colspan = " colspan=$cols" if ($cols > 1);
                write_html($handle, <<END_OF_HTML);
              <td class="tableHead"$colspan>$heading</td>
END_OF_HTML
        }
        write_html($handle, <<END_OF_HTML);
            </tr>
END_OF_HTML
}


# write_file_table_entry(handle, base_dir, filename, page_link,
#                        ([ found, hit, med_limit, hi_limit, graph ], ..)
#
# Write an entry of the file table.
#

sub write_file_table_entry(*$$$@)
{
        my ($handle, $base_dir, $filename, $page_link, @entries) = @_;
        my $file_code;
        my $entry;
        my $esc_filename = escape_html($filename);

        # Add link to source if provided
        if (defined($page_link) && $page_link ne "") {
                $file_code = "<a href=\"$page_link\">$esc_filename</a>";
        } else {
                $file_code = $esc_filename;
        }

        # First column: filename
        write_html($handle, <<END_OF_HTML);
            <tr>
              <td class="coverFile">$file_code</td>
END_OF_HTML
        # Columns as defined
        foreach $entry (@entries) {
                my ($found, $hit, $med, $hi, $graph) = @{$entry};
                my $bar_graph;
                my $class;
                my $rate;

                # Generate bar graph if requested
                if ($graph) {
                        $bar_graph = get_bar_graph_code($base_dir, $found,
                                                        $hit);
                        write_html($handle, <<END_OF_HTML);
              <td class="coverBar" align="center">
                $bar_graph
              </td>
END_OF_HTML
                }
                # Get rate color and text
                if ($found == 0) {
                        $rate = "-";
                        $class = "Hi";
                } else {
                        $rate = rate($hit, $found, "&nbsp;%");
                        $class = $rate_name[classify_rate($found, $hit,
                                            $med, $hi)];
                }
                write_html($handle, <<END_OF_HTML);
              <td class="coverPer$class">$rate</td>
              <td class="coverNum$class">$hit / $found</td>
END_OF_HTML
        }
        # End of row
        write_html($handle, <<END_OF_HTML);
            </tr>
END_OF_HTML
}


#
# write_file_table_detail_entry(filehandle, test_name, ([found, hit], ...))
#
# Write entry for detail section in file table.
#

sub write_file_table_detail_entry(*$@)
{
        my ($handle, $test, @entries) = @_;
        my $entry;

        if ($test eq "") {
                $test = "<span style=\"font-style:italic\">&lt;unnamed&gt;</span>";
        } elsif ($test =~ /^(.*),diff$/) {
                $test = $1." (converted)";
        }
        # Testname
        write_html($handle, <<END_OF_HTML);
            <tr>
              <td class="testName" colspan=2>$test</td>
END_OF_HTML
        # Test data
        foreach $entry (@entries) {
                my ($found, $hit) = @{$entry};
                my $rate = rate($hit, $found, "&nbsp;%");

                write_html($handle, <<END_OF_HTML);
              <td class="testPer">$rate</td>
              <td class="testNum">$hit&nbsp;/&nbsp;$found</td>
END_OF_HTML
        }

        write_html($handle, <<END_OF_HTML);
            </tr>

END_OF_HTML

        # *************************************************************
}


#
# write_file_table_epilog(filehandle)
#
# Write end of file table HTML code.
#

sub write_file_table_epilog(*)
{
        # *************************************************************

        write_html($_[0], <<END_OF_HTML)
          </table>
          </center>
          <br>

END_OF_HTML
        ;

        # *************************************************************
}


#
# write_test_table_prolog(filehandle, table_heading)
#
# Write heading for test case description table.
#

sub write_test_table_prolog(*$)
{
        # *************************************************************

        write_html($_[0], <<END_OF_HTML)
          <center>
          <table width="80%" cellpadding=2 cellspacing=1 border=0>

            <tr>
              <td><br></td>
            </tr>

            <tr>
              <td class="tableHead">$_[1]</td>
            </tr>

            <tr>
              <td class="testDescription">
                <dl>
END_OF_HTML
        ;

        # *************************************************************
}


#
# write_test_table_entry(filehandle, test_name, test_description)
#
# Write entry for the test table.
#

sub write_test_table_entry(*$$)
{
        # *************************************************************

        write_html($_[0], <<END_OF_HTML)
          <dt>$_[1]<a name="$_[1]">&nbsp;</a></dt>
          <dd>$_[2]<br><br></dd>
END_OF_HTML
        ;

        # *************************************************************
}


#
# write_test_table_epilog(filehandle)
#
# Write end of test description table HTML code.
#

sub write_test_table_epilog(*)
{
        # *************************************************************

        write_html($_[0], <<END_OF_HTML)
                </dl>
              </td>
            </tr>
          </table>
          </center>
          <br>

END_OF_HTML
        ;

        # *************************************************************
}


sub fmt_centered($$)
{
        my ($width, $text) = @_;
        my $w0 = length($text);
        my $w1 = int(($width - $w0) / 2);
        my $w2 = $width - $w0 - $w1;

        return (" "x$w1).$text.(" "x$w2);
}


#
# write_source_prolog(filehandle)
#
# Write start of source code table.
#

sub write_source_prolog(*)
{
        my $lineno_heading = "         ";
        my $branch_heading = "";
        my $line_heading = fmt_centered($line_field_width, "Line data");
        my $source_heading = " Source code";

        if ($br_coverage) {
                $branch_heading = fmt_centered($br_field_width, "Branch data").
                                  " ";
        }
        # *************************************************************

        write_html($_[0], <<END_OF_HTML)
          <table cellpadding=0 cellspacing=0 border=0>
            <tr>
              <td><br></td>
            </tr>
            <tr>
              <td>
<pre class="sourceHeading">${lineno_heading}${branch_heading}${line_heading} ${source_heading}</pre>
<pre class="source">
END_OF_HTML
        ;

        # *************************************************************
}


#
# get_branch_blocks(brdata)
#
# Group branches that belong to the same basic block.
#
# Returns: [block1, block2, ...]
# block:   [branch1, branch2, ...]
# branch:  [block_num, branch_num, taken_count, text_length, open, close]
#

sub get_branch_blocks($)
{
        my ($brdata) = @_;
        my $last_block_num;
        my $block = [];
        my @blocks;
        my $i;
        my $num = br_ivec_len($brdata);

        # Group branches
        for ($i = 0; $i < $num; $i++) {
                my ($block_num, $branch, $taken) = br_ivec_get($brdata, $i);
                my $br;

                if (defined($last_block_num) && $block_num != $last_block_num) {
                        push(@blocks, $block);
                        $block = [];
                }
                $br = [$block_num, $branch, $taken, 3, 0, 0];
                push(@{$block}, $br);
                $last_block_num = $block_num;
        }
        push(@blocks, $block) if (scalar(@{$block}) > 0);

        # Add braces to first and last branch in group
        foreach $block (@blocks) {
                $block->[0]->[$BR_OPEN] = 1;
                $block->[0]->[$BR_LEN]++;
                $block->[scalar(@{$block}) - 1]->[$BR_CLOSE] = 1;
                $block->[scalar(@{$block}) - 1]->[$BR_LEN]++;
        }

        return @blocks;
}

#
# get_block_len(block)
#
# Calculate total text length of all branches in a block of branches.
#

sub get_block_len($)
{
        my ($block) = @_;
        my $len = 0;
        my $branch;

        foreach $branch (@{$block}) {
                $len += $branch->[$BR_LEN];
        }

        return $len;
}


#
# get_branch_html(brdata)
#
# Return a list of HTML lines which represent the specified branch coverage
# data in source code view.
#

sub get_branch_html($)
{
        my ($brdata) = @_;
        my @blocks = get_branch_blocks($brdata);
        my $block;
        my $branch;
        my $line_len = 0;
        my $line = [];  # [branch2|" ", branch|" ", ...]
        my @lines;      # [line1, line2, ...]
        my @result;

        # Distribute blocks to lines
        foreach $block (@blocks) {
                my $block_len = get_block_len($block);

                # Does this block fit into the current line?
                if ($line_len + $block_len <= $br_field_width) {
                        # Add it
                        $line_len += $block_len;
                        push(@{$line}, @{$block});
                        next;
                } elsif ($block_len <= $br_field_width) {
                        # It would fit if the line was empty - add it to new
                        # line
                        push(@lines, $line);
                        $line_len = $block_len;
                        $line = [ @{$block} ];
                        next;
                }
                # Split the block into several lines
                foreach $branch (@{$block}) {
                        if ($line_len + $branch->[$BR_LEN] >= $br_field_width) {
                                # Start a new line
                                if (($line_len + 1 <= $br_field_width) &&
                                    scalar(@{$line}) > 0 &&
                                    !$line->[scalar(@$line) - 1]->[$BR_CLOSE]) {
                                        # Try to align branch symbols to be in
                                        # one # row
                                        push(@{$line}, " ");
                                }
                                push(@lines, $line);
                                $line_len = 0;
                                $line = [];
                        }
                        push(@{$line}, $branch);
                        $line_len += $branch->[$BR_LEN];
                }
        }
        push(@lines, $line);

        # Convert to HTML
        foreach $line (@lines) {
                my $current = "";
                my $current_len = 0;

                foreach $branch (@$line) {
                        # Skip alignment space
                        if ($branch eq " ") {
                                $current .= " ";
                                $current_len++;
                                next;
                        }

                        my ($block_num, $br_num, $taken, $len, $open, $close) =
                           @{$branch};
                        my $class;
                        my $title;
                        my $text;

                        if ($taken eq '-') {
                                $class  = "branchNoExec";
                                $text   = " # ";
                                $title  = "Branch $br_num was not executed";
                        } elsif ($taken == 0) {
                                $class  = "branchNoCov";
                                $text   = " - ";
                                $title  = "Branch $br_num was not taken";
                        } else {
                                $class  = "branchCov";
                                $text   = " + ";
                                $title  = "Branch $br_num was taken $taken ".
                                          "time";
                                $title .= "s" if ($taken > 1);
                        }
                        $current .= "[" if ($open);
                        $current .= "<span class=\"$class\" title=\"$title\">";
                        $current .= $text."</span>";
                        $current .= "]" if ($close);
                        $current_len += $len;
                }

                # Right-align result text
                if ($current_len < $br_field_width) {
                        $current = (" "x($br_field_width - $current_len)).
                                   $current;
                }
                push(@result, $current);
        }

        return @result;
}


#
# format_count(count, width)
#
# Return a right-aligned representation of count that fits in width characters.
#

sub format_count($$)
{
        my ($count, $width) = @_;
        my $result;
        my $exp;

        $result = sprintf("%*.0f", $width, $count);
        while (length($result) > $width) {
                last if ($count < 10);
                $exp++;
                $count = int($count/10);
                $result = sprintf("%*s", $width, ">$count*10^$exp");
        }
        return $result;
}

#
# write_source_line(filehandle, line_num, source, hit_count, converted,
#                   brdata, add_anchor)
#
# Write formatted source code line. Return a line in a format as needed
# by gen_png()
#

sub write_source_line(*$$$$$$)
{
        my ($handle, $line, $source, $count, $converted, $brdata,
            $add_anchor) = @_;
        my $source_format;
        my $count_format;
        my $result;
        my $anchor_start = "";
        my $anchor_end = "";
        my $count_field_width = $line_field_width - 1;
        my @br_html;
        my $html;

        # Get branch HTML data for this line
        @br_html = get_branch_html($brdata) if ($br_coverage);

        if (!defined($count)) {
                $result         = "";
                $source_format  = "";
                $count_format   = " "x$count_field_width;
        }
        elsif ($count == 0) {
                $result         = $count;
                $source_format  = '<span class="lineNoCov">';
                $count_format   = format_count($count, $count_field_width);
        }
        elsif ($converted && defined($highlight)) {
                $result         = "*".$count;
                $source_format  = '<span class="lineDiffCov">';
                $count_format   = format_count($count, $count_field_width);
        }
        else {
                $result         = $count;
                $source_format  = '<span class="lineCov">';
                $count_format   = format_count($count, $count_field_width);
        }
        $result .= ":".$source;

        # Write out a line number navigation anchor every $nav_resolution
        # lines if necessary
        if ($add_anchor)
        {
                $anchor_start   = "<a name=\"$_[1]\">";
                $anchor_end     = "</a>";
        }


        # *************************************************************

        $html = $anchor_start;
        $html .= "<span class=\"lineNum\">".sprintf("%8d", $line)." </span>";
        $html .= shift(@br_html).":" if ($br_coverage);
        $html .= "$source_format$count_format : ";
        $html .= escape_html($source);
        $html .= "</span>" if ($source_format);
        $html .= $anchor_end."\n";

        write_html($handle, $html);

        if ($br_coverage) {
                # Add lines for overlong branch information
                foreach (@br_html) {
                        write_html($handle, "<span class=\"lineNum\">".
                                   "         </span>$_\n");
                }
        }
        # *************************************************************

        return($result);
}


#
# write_source_epilog(filehandle)
#
# Write end of source code table.
#

sub write_source_epilog(*)
{
        # *************************************************************

        write_html($_[0], <<END_OF_HTML)
        </pre>
              </td>
            </tr>
          </table>
          <br>

END_OF_HTML
        ;

        # *************************************************************
}


#
# write_html_epilog(filehandle, base_dir[, break_frames])
#
# Write HTML page footer to FILEHANDLE. BREAK_FRAMES should be set when
# this page is embedded in a frameset, clicking the URL link will then
# break this frameset.
#

sub write_html_epilog(*$;$)
{
        my $basedir = $_[1];
        my $break_code = "";
        my $epilog;

        if (defined($_[2]))
        {
                $break_code = " target=\"_parent\"";
        }

        # *************************************************************

        write_html($_[0], <<END_OF_HTML)
          <table width="100%" border=0 cellspacing=0 cellpadding=0>
            <tr><td class="ruler"><img src="$_[1]glass.png" width=3 height=3 alt=""></td></tr>
            <tr><td class="versionInfo">Generated by: <a href="$lcov_url"$break_code>$lcov_version</a></td></tr>
          </table>
          <br>
END_OF_HTML
        ;

        $epilog = $html_epilog;
        $epilog =~ s/\@basedir\@/$basedir/g;

        write_html($_[0], $epilog);
}


#
# write_frameset(filehandle, basedir, basename, pagetitle)
#
#

sub write_frameset(*$$$)
{
        my $frame_width = $overview_width + 40;

        # *************************************************************

        write_html($_[0], <<END_OF_HTML)
        <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN">

        <html lang="en">

        <head>
          <meta http-equiv="Content-Type" content="text/html; charset=$charset">
          <title>$_[3]</title>
          <link rel="stylesheet" type="text/css" href="$_[1]gcov.css">
        </head>

        <frameset cols="$frame_width,*">
          <frame src="$_[2].gcov.overview.$html_ext" name="overview">
          <frame src="$_[2].gcov.$html_ext" name="source">
          <noframes>
            <center>Frames not supported by your browser!<br></center>
          </noframes>
        </frameset>

        </html>
END_OF_HTML
        ;

        # *************************************************************
}


#
# sub write_overview_line(filehandle, basename, line, link)
#
#

sub write_overview_line(*$$$)
{
        my $y1 = $_[2] - 1;
        my $y2 = $y1 + $nav_resolution - 1;
        my $x2 = $overview_width - 1;

        # *************************************************************

        write_html($_[0], <<END_OF_HTML)
            <area shape="rect" coords="0,$y1,$x2,$y2" href="$_[1].gcov.$html_ext#$_[3]" target="source" alt="overview">
END_OF_HTML
        ;

        # *************************************************************
}


#
# write_overview(filehandle, basedir, basename, pagetitle, lines)
#
#

sub write_overview(*$$$$)
{
        my $index;
        my $max_line = $_[4] - 1;
        my $offset;

        # *************************************************************

        write_html($_[0], <<END_OF_HTML)
        <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

        <html lang="en">

        <head>
          <title>$_[3]</title>
          <meta http-equiv="Content-Type" content="text/html; charset=$charset">
          <link rel="stylesheet" type="text/css" href="$_[1]gcov.css">
        </head>

        <body>
          <map name="overview">
END_OF_HTML
        ;

        # *************************************************************

        # Make $offset the next higher multiple of $nav_resolution
        $offset = ($nav_offset + $nav_resolution - 1) / $nav_resolution;
        $offset = sprintf("%d", $offset ) * $nav_resolution;

        # Create image map for overview image
        for ($index = 1; $index <= $_[4]; $index += $nav_resolution)
        {
                # Enforce nav_offset
                if ($index < $offset + 1)
                {
                        write_overview_line($_[0], $_[2], $index, 1);
                }
                else
                {
                        write_overview_line($_[0], $_[2], $index, $index - $offset);
                }
        }

        # *************************************************************

        write_html($_[0], <<END_OF_HTML)
          </map>

          <center>
          <a href="$_[2].gcov.$html_ext#top" target="source">Top</a><br><br>
          <img src="$_[2].gcov.png" width=$overview_width height=$max_line alt="Overview" border=0 usemap="#overview">
          </center>
        </body>
        </html>
END_OF_HTML
        ;

        # *************************************************************
}


sub max($$)
{
        my ($a, $b) = @_;

        return $a if ($a > $b);
        return $b;
}


#
# write_header(filehandle, type, trunc_file_name, rel_file_name, lines_found,
# lines_hit, funcs_found, funcs_hit, sort_type)
#
# Write a complete standard page header. TYPE may be (0, 1, 2, 3, 4)
# corresponding to (directory view header, file view header, source view
# header, test case description header, function view header)
#

sub write_header(*$$$$$$$$$$)
{
        local *HTML_HANDLE = $_[0];
        my $type = $_[1];
        my $trunc_name = $_[2];
        my $rel_filename = $_[3];
        my $lines_found = $_[4];
        my $lines_hit = $_[5];
        my $fn_found = $_[6];
        my $fn_hit = $_[7];
        my $br_found = $_[8];
        my $br_hit = $_[9];
        my $sort_type = $_[10];
        my $base_dir;
        my $view;
        my $test;
        my $base_name;
        my $style;
        my $rate;
        my @row_left;
        my @row_right;
        my $num_rows;
        my $i;
        my $esc_trunc_name = escape_html($trunc_name);

        $base_name = basename($rel_filename);

        # Prepare text for "current view" field
        if ($type == $HDR_DIR)
        {
                # Main overview
                $base_dir = "";
                $view = $overview_title;
        }
        elsif ($type == $HDR_FILE)
        {
                # Directory overview
                $base_dir = get_relative_base_path($rel_filename);
                $view = "<a href=\"$base_dir"."index.$html_ext\">".
                        "$overview_title</a> - $esc_trunc_name";
        }
        elsif ($type == $HDR_SOURCE || $type == $HDR_FUNC)
        {
                # File view
                my $dir_name = dirname($rel_filename);
                my $esc_base_name = escape_html($base_name);
                my $esc_dir_name = escape_html($dir_name);

                $base_dir = get_relative_base_path($dir_name);
                if ($frames)
                {
                        # Need to break frameset when clicking any of these
                        # links
                        $view = "<a href=\"$base_dir"."index.$html_ext\" ".
                                "target=\"_parent\">$overview_title</a> - ".
                                "<a href=\"index.$html_ext\" target=\"_parent\">".
                                "$esc_dir_name</a> - $esc_base_name";
                }
                else
                {
                        $view = "<a href=\"$base_dir"."index.$html_ext\">".
                                "$overview_title</a> - ".
                                "<a href=\"index.$html_ext\">".
                                "$esc_dir_name</a> - $esc_base_name";
                }

                # Add function suffix
                if ($func_coverage) {
                        $view .= "<span style=\"font-size: 80%;\">";
                        if ($type == $HDR_SOURCE) {
                                $view .= " (source / <a href=\"$base_name.func.$html_ext\">functions</a>)";
                        } elsif ($type == $HDR_FUNC) {
                                $view .= " (<a href=\"$base_name.gcov.$html_ext\">source</a> / functions)";
                        }
                        $view .= "</span>";
                }
        }
        elsif ($type == $HDR_TESTDESC)
        {
                # Test description header
                $base_dir = "";
                $view = "<a href=\"$base_dir"."index.$html_ext\">".
                        "$overview_title</a> - test case descriptions";
        }

        # Prepare text for "test" field
        $test = escape_html($test_title);

        # Append link to test description page if available
        if (%test_description && ($type != $HDR_TESTDESC))
        {
                if ($frames && ($type == $HDR_SOURCE || $type == $HDR_FUNC))
                {
                        # Need to break frameset when clicking this link
                        $test .= " ( <span style=\"font-size:80%;\">".
                                 "<a href=\"$base_dir".
                                 "descriptions.$html_ext\" target=\"_parent\">".
                                 "view descriptions</a></span> )";
                }
                else
                {
                        $test .= " ( <span style=\"font-size:80%;\">".
                                 "<a href=\"$base_dir".
                                 "descriptions.$html_ext\">".
                                 "view descriptions</a></span> )";
                }
        }

        # Write header
        write_header_prolog(*HTML_HANDLE, $base_dir);

        # Left row
        push(@row_left, [[ "10%", "headerItem", "Current view:" ],
                         [ "35%", "headerValue", $view ]]);
        push(@row_left, [[undef, "headerItem", "Test:"],
                         [undef, "headerValue", $test]]);
        push(@row_left, [[undef, "headerItem", "Date:"],
                         [undef, "headerValue", $date]]);

        # Right row
        if ($legend && ($type == $HDR_SOURCE || $type == $HDR_FUNC)) {
                my $text = <<END_OF_HTML;
            Lines:
            <span class="coverLegendCov">hit</span>
            <span class="coverLegendNoCov">not hit</span>
END_OF_HTML
                if ($br_coverage) {
                        $text .= <<END_OF_HTML;
            | Branches:
            <span class="coverLegendCov">+</span> taken
            <span class="coverLegendNoCov">-</span> not taken
            <span class="coverLegendNoCov">#</span> not executed
END_OF_HTML
                }
                push(@row_left, [[undef, "headerItem", "Legend:"],
                                 [undef, "headerValueLeg", $text]]);
        } elsif ($legend && ($type != $HDR_TESTDESC)) {
                my $text = <<END_OF_HTML;
            Rating:
            <span class="coverLegendCovLo" title="Coverage rates below $med_limit % are classified as low">low: &lt; $med_limit %</span>
            <span class="coverLegendCovMed" title="Coverage rates between $med_limit % and $hi_limit % are classified as medium">medium: &gt;= $med_limit %</span>
            <span class="coverLegendCovHi" title="Coverage rates of $hi_limit % and more are classified as high">high: &gt;= $hi_limit %</span>
END_OF_HTML
                push(@row_left, [[undef, "headerItem", "Legend:"],
                                 [undef, "headerValueLeg", $text]]);
        }
        if ($type == $HDR_TESTDESC) {
                push(@row_right, [[ "55%" ]]);
        } else {
                push(@row_right, [["15%", undef, undef ],
                                  ["10%", "headerCovTableHead", "Hit" ],
                                  ["10%", "headerCovTableHead", "Total" ],
                                  ["15%", "headerCovTableHead", "Coverage"]]);
        }
        # Line coverage
        $style = $rate_name[classify_rate($lines_found, $lines_hit,
                                          $med_limit, $hi_limit)];
        $rate = rate($lines_hit, $lines_found, " %");
        push(@row_right, [[undef, "headerItem", "Lines:"],
                          [undef, "headerCovTableEntry", $lines_hit],
                          [undef, "headerCovTableEntry", $lines_found],
                          [undef, "headerCovTableEntry$style", $rate]])
                        if ($type != $HDR_TESTDESC);
        # Function coverage
        if ($func_coverage) {
                $style = $rate_name[classify_rate($fn_found, $fn_hit,
                                                  $fn_med_limit, $fn_hi_limit)];
                $rate = rate($fn_hit, $fn_found, " %");
                push(@row_right, [[undef, "headerItem", "Functions:"],
                                  [undef, "headerCovTableEntry", $fn_hit],
                                  [undef, "headerCovTableEntry", $fn_found],
                                  [undef, "headerCovTableEntry$style", $rate]])
                        if ($type != $HDR_TESTDESC);
        }
        # Branch coverage
        if ($br_coverage) {
                $style = $rate_name[classify_rate($br_found, $br_hit,
                                                  $br_med_limit, $br_hi_limit)];
                $rate = rate($br_hit, $br_found, " %");
                push(@row_right, [[undef, "headerItem", "Branches:"],
                                  [undef, "headerCovTableEntry", $br_hit],
                                  [undef, "headerCovTableEntry", $br_found],
                                  [undef, "headerCovTableEntry$style", $rate]])
                        if ($type != $HDR_TESTDESC);
        }

        # Print rows
        $num_rows = max(scalar(@row_left), scalar(@row_right));
        for ($i = 0; $i < $num_rows; $i++) {
                my $left = $row_left[$i];
                my $right = $row_right[$i];

                if (!defined($left)) {
                        $left = [[undef, undef, undef], [undef, undef, undef]];
                }
                if (!defined($right)) {
                        $right = [];
                }
                write_header_line(*HTML_HANDLE, @{$left},
                                  [ $i == 0 ? "5%" : undef, undef, undef],
                                  @{$right});
        }

        # Fourth line
        write_header_epilog(*HTML_HANDLE, $base_dir);
}


#
# get_sorted_keys(hash_ref, sort_type)
#

sub get_sorted_keys($$)
{
        my ($hash, $type) = @_;

        if ($type == $SORT_FILE) {
                # Sort by name
                return sort(keys(%{$hash}));
        } elsif ($type == $SORT_LINE) {
                # Sort by line coverage
                return sort({$hash->{$a}[7] <=> $hash->{$b}[7]} keys(%{$hash}));
        } elsif ($type == $SORT_FUNC) {
                # Sort by function coverage;
                return sort({$hash->{$a}[8] <=> $hash->{$b}[8]} keys(%{$hash}));
        } elsif ($type == $SORT_BRANCH) {
                # Sort by br coverage;
                return sort({$hash->{$a}[9] <=> $hash->{$b}[9]} keys(%{$hash}));
        }
}

sub get_sort_code($$$)
{
        my ($link, $alt, $base) = @_;
        my $png;
        my $link_start;
        my $link_end;

        if (!defined($link)) {
                $png = "glass.png";
                $link_start = "";
                $link_end = "";
        } else {
                $png = "updown.png";
                $link_start = '<a href="'.$link.'">';
                $link_end = "</a>";
        }

        return ' <span class="tableHeadSort">'.$link_start.
               '<img src="'.$base.$png.'" width=10 height=14 '.
               'alt="'.$alt.'" title="'.$alt.'" border=0>'.$link_end.'</span>';
}

sub get_file_code($$$$)
{
        my ($type, $text, $sort_button, $base) = @_;
        my $result = $text;
        my $link;

        if ($sort_button) {
                if ($type == $HEAD_NO_DETAIL) {
                        $link = "index.$html_ext";
                } else {
                        $link = "index-detail.$html_ext";
                }
        }
        $result .= get_sort_code($link, "Sort by name", $base);

        return $result;
}

sub get_line_code($$$$$)
{
        my ($type, $sort_type, $text, $sort_button, $base) = @_;
        my $result = $text;
        my $sort_link;

        if ($type == $HEAD_NO_DETAIL) {
                # Just text
                if ($sort_button) {
                        $sort_link = "index-sort-l.$html_ext";
                }
        } elsif ($type == $HEAD_DETAIL_HIDDEN) {
                # Text + link to detail view
                $result .= ' ( <a class="detail" href="index-detail'.
                           $fileview_sortname[$sort_type].'.'.$html_ext.
                           '">show details</a> )';
                if ($sort_button) {
                        $sort_link = "index-sort-l.$html_ext";
                }
        } else {
                # Text + link to standard view
                $result .= ' ( <a class="detail" href="index'.
                           $fileview_sortname[$sort_type].'.'.$html_ext.
                           '">hide details</a> )';
                if ($sort_button) {
                        $sort_link = "index-detail-sort-l.$html_ext";
                }
        }
        # Add sort button
        $result .= get_sort_code($sort_link, "Sort by line coverage", $base);

        return $result;
}

sub get_func_code($$$$)
{
        my ($type, $text, $sort_button, $base) = @_;
        my $result = $text;
        my $link;

        if ($sort_button) {
                if ($type == $HEAD_NO_DETAIL) {
                        $link = "index-sort-f.$html_ext";
                } else {
                        $link = "index-detail-sort-f.$html_ext";
                }
        }
        $result .= get_sort_code($link, "Sort by function coverage", $base);
        return $result;
}

sub get_br_code($$$$)
{
        my ($type, $text, $sort_button, $base) = @_;
        my $result = $text;
        my $link;

        if ($sort_button) {
                if ($type == $HEAD_NO_DETAIL) {
                        $link = "index-sort-b.$html_ext";
                } else {
                        $link = "index-detail-sort-b.$html_ext";
                }
        }
        $result .= get_sort_code($link, "Sort by branch coverage", $base);
        return $result;
}

#
# write_file_table(filehandle, base_dir, overview, testhash, testfnchash,
#                  testbrhash, fileview, sort_type)
#
# Write a complete file table. OVERVIEW is a reference to a hash containing
# the following mapping:
#
#   filename -> "lines_found,lines_hit,funcs_found,funcs_hit,page_link,
#                func_link"
#
# TESTHASH is a reference to the following hash:
#
#   filename -> \%testdata
#   %testdata: name of test affecting this file -> \%testcount
#   %testcount: line number -> execution count for a single test
#
# Heading of first column is "Filename" if FILEVIEW is true, "Directory name"
# otherwise.
#

sub write_file_table(*$$$$$$$)
{
        local *HTML_HANDLE = $_[0];
        my $base_dir = $_[1];
        my $overview = $_[2];
        my $testhash = $_[3];
        my $testfnchash = $_[4];
        my $testbrhash = $_[5];
        my $fileview = $_[6];
        my $sort_type = $_[7];
        my $filename;
        my $bar_graph;
        my $hit;
        my $found;
        my $fn_found;
        my $fn_hit;
        my $br_found;
        my $br_hit;
        my $page_link;
        my $testname;
        my $testdata;
        my $testfncdata;
        my $testbrdata;
        my %affecting_tests;
        my $line_code = "";
        my $func_code;
        my $br_code;
        my $file_code;
        my @head_columns;

        # Determine HTML code for column headings
        if (($base_dir ne "") && $show_details)
        {
                my $detailed = keys(%{$testhash});

                $file_code = get_file_code($detailed ? $HEAD_DETAIL_HIDDEN :
                                        $HEAD_NO_DETAIL,
                                        $fileview ? "Filename" : "Directory",
                                        $sort && $sort_type != $SORT_FILE,
                                        $base_dir);
                $line_code = get_line_code($detailed ? $HEAD_DETAIL_SHOWN :
                                        $HEAD_DETAIL_HIDDEN,
                                        $sort_type,
                                        "Line Coverage",
                                        $sort && $sort_type != $SORT_LINE,
                                        $base_dir);
                $func_code = get_func_code($detailed ? $HEAD_DETAIL_HIDDEN :
                                        $HEAD_NO_DETAIL,
                                        "Functions",
                                        $sort && $sort_type != $SORT_FUNC,
                                        $base_dir);
                $br_code = get_br_code($detailed ? $HEAD_DETAIL_HIDDEN :
                                        $HEAD_NO_DETAIL,
                                        "Branches",
                                        $sort && $sort_type != $SORT_BRANCH,
                                        $base_dir);
        } else {
                $file_code = get_file_code($HEAD_NO_DETAIL,
                                        $fileview ? "Filename" : "Directory",
                                        $sort && $sort_type != $SORT_FILE,
                                        $base_dir);
                $line_code = get_line_code($HEAD_NO_DETAIL, $sort_type, "Line Coverage",
                                        $sort && $sort_type != $SORT_LINE,
                                        $base_dir);
                $func_code = get_func_code($HEAD_NO_DETAIL, "Functions",
                                        $sort && $sort_type != $SORT_FUNC,
                                        $base_dir);
                $br_code = get_br_code($HEAD_NO_DETAIL, "Branches",
                                        $sort && $sort_type != $SORT_BRANCH,
                                        $base_dir);
        }
        push(@head_columns, [ $line_code, 3 ]);
        push(@head_columns, [ $func_code, 2]) if ($func_coverage);
        push(@head_columns, [ $br_code, 2]) if ($br_coverage);

        write_file_table_prolog(*HTML_HANDLE, $file_code, @head_columns);

        foreach $filename (get_sorted_keys($overview, $sort_type))
        {
                my @columns;
                ($found, $hit, $fn_found, $fn_hit, $br_found, $br_hit,
                 $page_link) = @{$overview->{$filename}};

                # Line coverage
                push(@columns, [$found, $hit, $med_limit, $hi_limit, 1]);
                # Function coverage
                if ($func_coverage) {
                        push(@columns, [$fn_found, $fn_hit, $fn_med_limit,
                                        $fn_hi_limit, 0]);
                }
                # Branch coverage
                if ($br_coverage) {
                        push(@columns, [$br_found, $br_hit, $br_med_limit,
                                        $br_hi_limit, 0]);
                }
                write_file_table_entry(*HTML_HANDLE, $base_dir, $filename,
                                       $page_link, @columns);

                $testdata = $testhash->{$filename};
                $testfncdata = $testfnchash->{$filename};
                $testbrdata = $testbrhash->{$filename};

                # Check whether we should write test specific coverage
                # as well
                if (!($show_details && $testdata)) { next; }

                # Filter out those tests that actually affect this file
                %affecting_tests = %{ get_affecting_tests($testdata,
                                        $testfncdata, $testbrdata) };

                # Does any of the tests affect this file at all?
                if (!%affecting_tests) { next; }

                foreach $testname (keys(%affecting_tests))
                {
                        my @results;
                        ($found, $hit, $fn_found, $fn_hit, $br_found, $br_hit) =
                                split(",", $affecting_tests{$testname});

                        # Insert link to description of available
                        if ($test_description{$testname})
                        {
                                $testname = "<a href=\"$base_dir".
                                            "descriptions.$html_ext#$testname\">".
                                            "$testname</a>";
                        }

                        push(@results, [$found, $hit]);
                        push(@results, [$fn_found, $fn_hit]) if ($func_coverage);
                        push(@results, [$br_found, $br_hit]) if ($br_coverage);
                        write_file_table_detail_entry(*HTML_HANDLE, $testname,
                                @results);
                }
        }

        write_file_table_epilog(*HTML_HANDLE);
}


#
# get_found_and_hit(hash)
#
# Return the count for entries (found) and entries with an execution count
# greater than zero (hit) in a hash (linenumber -> execution count) as
# a list (found, hit)
#

sub get_found_and_hit($)
{
        my %hash = %{$_[0]};
        my $found = 0;
        my $hit = 0;

        # Calculate sum
        $found = 0;
        $hit = 0;
                        
        foreach (keys(%hash))
        {
                $found++;
                if ($hash{$_}>0) { $hit++; }
        }

        return ($found, $hit);
}


#
# get_func_found_and_hit(sumfnccount)
#
# Return (f_found, f_hit) for sumfnccount
#

sub get_func_found_and_hit($)
{
        my ($sumfnccount) = @_;
        my $function;
        my $fn_found;
        my $fn_hit;

        $fn_found = scalar(keys(%{$sumfnccount}));
        $fn_hit = 0;
        foreach $function (keys(%{$sumfnccount})) {
                if ($sumfnccount->{$function} > 0) {
                        $fn_hit++;
                }
        }
        return ($fn_found, $fn_hit);
}


#
# br_taken_to_num(taken)
#
# Convert a branch taken value .info format to number format.
#

sub br_taken_to_num($)
{
        my ($taken) = @_;

        return 0 if ($taken eq '-');
        return $taken + 1;
}


#
# br_num_to_taken(taken)
#
# Convert a branch taken value in number format to .info format.
#

sub br_num_to_taken($)
{
        my ($taken) = @_;

        return '-' if ($taken == 0);
        return $taken - 1;
}


#
# br_taken_add(taken1, taken2)
#
# Return the result of taken1 + taken2 for 'branch taken' values.
#

sub br_taken_add($$)
{
        my ($t1, $t2) = @_;

        return $t1 if (!defined($t2));
        return $t2 if (!defined($t1));
        return $t1 if ($t2 eq '-');
        return $t2 if ($t1 eq '-');
        return $t1 + $t2;
}


#
# br_taken_sub(taken1, taken2)
#
# Return the result of taken1 - taken2 for 'branch taken' values. Return 0
# if the result would become negative.
#

sub br_taken_sub($$)
{
        my ($t1, $t2) = @_;

        return $t1 if (!defined($t2));
        return undef if (!defined($t1));
        return $t1 if ($t1 eq '-');
        return $t1 if ($t2 eq '-');
        return 0 if $t2 > $t1;
        return $t1 - $t2;
}


#
# br_ivec_len(vector)
#
# Return the number of entries in the branch coverage vector.
#

sub br_ivec_len($)
{
        my ($vec) = @_;

        return 0 if (!defined($vec));
        return (length($vec) * 8 / $BR_VEC_WIDTH) / $BR_VEC_ENTRIES;
}


#
# br_ivec_get(vector, number)
#
# Return an entry from the branch coverage vector.
#

sub br_ivec_get($$)
{
        my ($vec, $num) = @_;
        my $block;
        my $branch;
        my $taken;
        my $offset = $num * $BR_VEC_ENTRIES;

        # Retrieve data from vector
        $block  = vec($vec, $offset + $BR_BLOCK, $BR_VEC_WIDTH);
        $branch = vec($vec, $offset + $BR_BRANCH, $BR_VEC_WIDTH);
        $taken  = vec($vec, $offset + $BR_TAKEN, $BR_VEC_WIDTH);

        # Decode taken value from an integer
        $taken = br_num_to_taken($taken);

        return ($block, $branch, $taken);
}


#
# br_ivec_push(vector, block, branch, taken)
#
# Add an entry to the branch coverage vector. If an entry with the same
# branch ID already exists, add the corresponding taken values.
#

sub br_ivec_push($$$$)
{
        my ($vec, $block, $branch, $taken) = @_;
        my $offset;
        my $num = br_ivec_len($vec);
        my $i;

        $vec = "" if (!defined($vec));

        # Check if branch already exists in vector
        for ($i = 0; $i < $num; $i++) {
                my ($v_block, $v_branch, $v_taken) = br_ivec_get($vec, $i);

                next if ($v_block != $block || $v_branch != $branch);

                # Add taken counts
                $taken = br_taken_add($taken, $v_taken);
                last;
        }

        $offset = $i * $BR_VEC_ENTRIES;
        $taken = br_taken_to_num($taken);

        # Add to vector
        vec($vec, $offset + $BR_BLOCK, $BR_VEC_WIDTH) = $block;
        vec($vec, $offset + $BR_BRANCH, $BR_VEC_WIDTH) = $branch;
        vec($vec, $offset + $BR_TAKEN, $BR_VEC_WIDTH) = $taken;

        return $vec;
}


#
# get_br_found_and_hit(sumbrcount)
#
# Return (br_found, br_hit) for sumbrcount
#

sub get_br_found_and_hit($)
{
        my ($sumbrcount) = @_;
        my $line;
        my $br_found = 0;
        my $br_hit = 0;

        foreach $line (keys(%{$sumbrcount})) {
                my $brdata = $sumbrcount->{$line};
                my $i;
                my $num = br_ivec_len($brdata);

                for ($i = 0; $i < $num; $i++) {
                        my $taken;

                        (undef, undef, $taken) = br_ivec_get($brdata, $i);

                        $br_found++;
                        $br_hit++ if ($taken ne "-" && $taken > 0);
                }
        }

        return ($br_found, $br_hit);
}


#
# get_affecting_tests(testdata, testfncdata, testbrdata)
#
# HASHREF contains a mapping filename -> (linenumber -> exec count). Return
# a hash containing mapping filename -> "lines found, lines hit" for each
# filename which has a nonzero hit count.
#

sub get_affecting_tests($$$)
{
        my ($testdata, $testfncdata, $testbrdata) = @_;
        my $testname;
        my $testcount;
        my $testfnccount;
        my $testbrcount;
        my %result;
        my $found;
        my $hit;
        my $fn_found;
        my $fn_hit;
        my $br_found;
        my $br_hit;

        foreach $testname (keys(%{$testdata}))
        {
                # Get (line number -> count) hash for this test case
                $testcount = $testdata->{$testname};
                $testfnccount = $testfncdata->{$testname};
                $testbrcount = $testbrdata->{$testname};

                # Calculate sum
                ($found, $hit) = get_found_and_hit($testcount);
                ($fn_found, $fn_hit) = get_func_found_and_hit($testfnccount);
                ($br_found, $br_hit) = get_br_found_and_hit($testbrcount);

                if ($hit>0)
                {
                        $result{$testname} = "$found,$hit,$fn_found,$fn_hit,".
                                             "$br_found,$br_hit";
                }
        }

        return(\%result);
}


sub get_hash_reverse($)
{
        my ($hash) = @_;
        my %result;

        foreach (keys(%{$hash})) {
                $result{$hash->{$_}} = $_;
        }

        return \%result;
}

#
# write_source(filehandle, source_filename, count_data, checksum_data,
#              converted_data, func_data, sumbrcount)
#
# Write an HTML view of a source code file. Returns a list containing
# data as needed by gen_png().
#
# Die on error.
#

sub write_source($$$$$$$)
{
        local *HTML_HANDLE = $_[0];
        local *SOURCE_HANDLE;
        my $source_filename = $_[1];
        my %count_data;
        my $line_number;
        my @result;
        my $checkdata = $_[3];
        my $converted = $_[4];
        my $funcdata  = $_[5];
        my $sumbrcount = $_[6];
        my $datafunc = get_hash_reverse($funcdata);
        my $add_anchor;
        my @file;

        if ($_[2])
        {
                %count_data = %{$_[2]};
        }

        if (!open(SOURCE_HANDLE, "<", $source_filename)) {
                my @lines;
                my $last_line = 0;

                if (!$ignore[$ERROR_SOURCE]) {
                        die("ERROR: cannot read $source_filename\n");
                }

                # Continue without source file
                warn("WARNING: cannot read $source_filename!\n");

                @lines = sort( { $a <=> $b }  keys(%count_data));
                if (@lines) {
                        $last_line = $lines[scalar(@lines) - 1];
                }
                return ( ":" ) if ($last_line < 1);

                # Simulate gcov behavior
                for ($line_number = 1; $line_number <= $last_line;
                     $line_number++) {
                        push(@file, "/* EOF */");
                }
        } else {
                @file = <SOURCE_HANDLE>;
        }
        
        write_source_prolog(*HTML_HANDLE);
        $line_number = 0;
        foreach (@file) {
                $line_number++;
                chomp($_);

                # Also remove CR from line-end
                s/\015$//;

                # Source code matches coverage data?
                if (defined($checkdata->{$line_number}) &&
                    ($checkdata->{$line_number} ne md5_base64($_)))
                {
                        die("ERROR: checksum mismatch  at $source_filename:".
                            "$line_number\n");
                }

                $add_anchor = 0;
                if ($frames) {
                        if (($line_number - 1) % $nav_resolution == 0) {
                                $add_anchor = 1;
                        }
                }
                if ($func_coverage) {
                        if ($line_number == 1) {
                                $add_anchor = 1;
                        } elsif (defined($datafunc->{$line_number +
                                                     $func_offset})) {
                                $add_anchor = 1;
                        }
                }
                push (@result,
                      write_source_line(HTML_HANDLE, $line_number,
                                        $_, $count_data{$line_number},
                                        $converted->{$line_number},
                                        $sumbrcount->{$line_number}, $add_anchor));
        }

        close(SOURCE_HANDLE);
        write_source_epilog(*HTML_HANDLE);
        return(@result);
}


sub funcview_get_func_code($$$)
{
        my ($name, $base, $type) = @_;
        my $result;
        my $link;

        if ($sort && $type == 1) {
                $link = "$name.func.$html_ext";
        }
        $result = "Function Name";
        $result .= get_sort_code($link, "Sort by function name", $base);

        return $result;
}

sub funcview_get_count_code($$$)
{
        my ($name, $base, $type) = @_;
        my $result;
        my $link;

        if ($sort && $type == 0) {
                $link = "$name.func-sort-c.$html_ext";
        }
        $result = "Hit count";
        $result .= get_sort_code($link, "Sort by hit count", $base);

        return $result;
}

#
# funcview_get_sorted(funcdata, sumfncdata, sort_type)
#
# Depending on the value of sort_type, return a list of functions sorted
# by name (type 0) or by the associated call count (type 1).
#

sub funcview_get_sorted($$$)
{
        my ($funcdata, $sumfncdata, $type) = @_;

        if ($type == 0) {
                return sort(keys(%{$funcdata}));
        }
        return sort({$sumfncdata->{$b} <=> $sumfncdata->{$a}}
                    keys(%{$sumfncdata}));
}

#
# write_function_table(filehandle, source_file, sumcount, funcdata,
#                      sumfnccount, testfncdata, sumbrcount, testbrdata,
#                      base_name, base_dir, sort_type)
#
# Write an HTML table listing all functions in a source file, including
# also function call counts and line coverages inside of each function.
#
# Die on error.
#

sub write_function_table(*$$$$$$$$$$)
{
        local *HTML_HANDLE = $_[0];
        my $source = $_[1];
        my $sumcount = $_[2];
        my $funcdata = $_[3];
        my $sumfncdata = $_[4];
        my $testfncdata = $_[5];
        my $sumbrcount = $_[6];
        my $testbrdata = $_[7];
        my $name = $_[8];
        my $base = $_[9];
        my $type = $_[10];
        my $func;
        my $func_code;
        my $count_code;

        # Get HTML code for headings
        $func_code = funcview_get_func_code($name, $base, $type);
        $count_code = funcview_get_count_code($name, $base, $type);
        write_html(*HTML_HANDLE, <<END_OF_HTML)
          <center>
          <table width="60%" cellpadding=1 cellspacing=1 border=0>
            <tr><td><br></td></tr>
            <tr>
              <td width="80%" class="tableHead">$func_code</td>
              <td width="20%" class="tableHead">$count_code</td>
            </tr>
END_OF_HTML
        ;
        
        # Get a sorted table
        foreach $func (funcview_get_sorted($funcdata, $sumfncdata, $type)) {
                if (!defined($funcdata->{$func}))
                {
                        next;
                }

                my $startline = $funcdata->{$func} - $func_offset;
                my $name = $func;
                my $count = $sumfncdata->{$name};
                my $countstyle;

                # Demangle C++ function names if requested
                if ($demangle_cpp) {
                        $name = `c++filt "$name"`;
                        chomp($name);
                }
                # Escape any remaining special characters
                $name = escape_html($name);
                if ($startline < 1) {
                        $startline = 1;
                }
                if ($count == 0) {
                        $countstyle = "coverFnLo";
                } else {
                        $countstyle = "coverFnHi";
                }

                write_html(*HTML_HANDLE, <<END_OF_HTML)
            <tr>
              <td class="coverFn"><a href="$source#$startline">$name</a></td>
              <td class="$countstyle">$count</td>
            </tr>
END_OF_HTML
                ;
        }
        write_html(*HTML_HANDLE, <<END_OF_HTML)
          </table>
          <br>
          </center>
END_OF_HTML
        ;
}


#
# info(printf_parameter)
#
# Use printf to write PRINTF_PARAMETER to stdout only when the $quiet flag
# is not set.
#

sub info(@)
{
        if (!$quiet)
        {
                # Print info string
                printf(@_);
        }
}


#
# subtract_counts(data_ref, base_ref)
#

sub subtract_counts($$)
{
        my %data = %{$_[0]};
        my %base = %{$_[1]};
        my $line;
        my $data_count;
        my $base_count;
        my $hit = 0;
        my $found = 0;

        foreach $line (keys(%data))
        {
                $found++;
                $data_count = $data{$line};
                $base_count = $base{$line};

                if (defined($base_count))
                {
                        $data_count -= $base_count;

                        # Make sure we don't get negative numbers
                        if ($data_count<0) { $data_count = 0; }
                }

                $data{$line} = $data_count;
                if ($data_count > 0) { $hit++; }
        }

        return (\%data, $found, $hit);
}


#
# subtract_fnccounts(data, base)
#
# Subtract function call counts found in base from those in data.
# Return (data, f_found, f_hit).
#

sub subtract_fnccounts($$)
{
        my %data;
        my %base;
        my $func;
        my $data_count;
        my $base_count;
        my $fn_hit = 0;
        my $fn_found = 0;

        %data = %{$_[0]} if (defined($_[0]));
        %base = %{$_[1]} if (defined($_[1]));
        foreach $func (keys(%data)) {
                $fn_found++;
                $data_count = $data{$func};
                $base_count = $base{$func};

                if (defined($base_count)) {
                        $data_count -= $base_count;

                        # Make sure we don't get negative numbers
                        if ($data_count < 0) {
                                $data_count = 0;
                        }
                }

                $data{$func} = $data_count;
                if ($data_count > 0) {
                        $fn_hit++;
                }
        }

        return (\%data, $fn_found, $fn_hit);
}


#
# apply_baseline(data_ref, baseline_ref)
#
# Subtract the execution counts found in the baseline hash referenced by
# BASELINE_REF from actual data in DATA_REF.
#

sub apply_baseline($$)
{
        my %data_hash = %{$_[0]};
        my %base_hash = %{$_[1]};
        my $filename;
        my $testname;
        my $data;
        my $data_testdata;
        my $data_funcdata;
        my $data_checkdata;
        my $data_testfncdata;
        my $data_testbrdata;
        my $data_count;
        my $data_testfnccount;
        my $data_testbrcount;
        my $base;
        my $base_checkdata;
        my $base_sumfnccount;
        my $base_sumbrcount;
        my $base_count;
        my $sumcount;
        my $sumfnccount;
        my $sumbrcount;
        my $found;
        my $hit;
        my $fn_found;
        my $fn_hit;
        my $br_found;
        my $br_hit;

        foreach $filename (keys(%data_hash))
        {
                # Get data set for data and baseline
                $data = $data_hash{$filename};
                $base = $base_hash{$filename};

                # Skip data entries for which no base entry exists
                if (!defined($base))
                {
                        next;
                }

                # Get set entries for data and baseline
                ($data_testdata, undef, $data_funcdata, $data_checkdata,
                 $data_testfncdata, undef, $data_testbrdata) =
                        get_info_entry($data);
                (undef, $base_count, undef, $base_checkdata, undef,
                 $base_sumfnccount, undef, $base_sumbrcount) =
                        get_info_entry($base);

                # Check for compatible checksums
                merge_checksums($data_checkdata, $base_checkdata, $filename);

                # sumcount has to be calculated anew
                $sumcount = {};
                $sumfnccount = {};
                $sumbrcount = {};

                # For each test case, subtract test specific counts
                foreach $testname (keys(%{$data_testdata}))
                {
                        # Get counts of both data and baseline
                        $data_count = $data_testdata->{$testname};
                        $data_testfnccount = $data_testfncdata->{$testname};
                        $data_testbrcount = $data_testbrdata->{$testname};

                        ($data_count, undef, $hit) =
                                subtract_counts($data_count, $base_count);
                        ($data_testfnccount) =
                                subtract_fnccounts($data_testfnccount,
                                                   $base_sumfnccount);
                        ($data_testbrcount) =
                                combine_brcount($data_testbrcount,
                                                 $base_sumbrcount, $BR_SUB);


                        # Check whether this test case did hit any line at all
                        if ($hit > 0)
                        {
                                # Write back resulting hash
                                $data_testdata->{$testname} = $data_count;
                                $data_testfncdata->{$testname} =
                                        $data_testfnccount;
                                $data_testbrdata->{$testname} =
                                        $data_testbrcount;
                        }
                        else
                        {
                                # Delete test case which did not impact this
                                # file
                                delete($data_testdata->{$testname});
                                delete($data_testfncdata->{$testname});
                                delete($data_testbrdata->{$testname});
                        }

                        # Add counts to sum of counts
                        ($sumcount, $found, $hit) =
                                add_counts($sumcount, $data_count);
                        ($sumfnccount, $fn_found, $fn_hit) =
                                add_fnccount($sumfnccount, $data_testfnccount);
                        ($sumbrcount, $br_found, $br_hit) =
                                combine_brcount($sumbrcount, $data_testbrcount,
                                                $BR_ADD);
                }

                # Write back resulting entry
                set_info_entry($data, $data_testdata, $sumcount, $data_funcdata,
                               $data_checkdata, $data_testfncdata, $sumfnccount,
                               $data_testbrdata, $sumbrcount, $found, $hit,
                               $fn_found, $fn_hit, $br_found, $br_hit);

                $data_hash{$filename} = $data;
        }

        return (\%data_hash);
}


#
# remove_unused_descriptions()
#
# Removes all test descriptions from the global hash %test_description which
# are not present in %info_data.
#

sub remove_unused_descriptions()
{
        my $filename;           # The current filename
        my %test_list;          # Hash containing found test names
        my $test_data;          # Reference to hash test_name -> count_data
        my $before;             # Initial number of descriptions
        my $after;              # Remaining number of descriptions
        
        $before = scalar(keys(%test_description));

        foreach $filename (keys(%info_data))
        {
                ($test_data) = get_info_entry($info_data{$filename});
                foreach (keys(%{$test_data}))
                {
                        $test_list{$_} = "";
                }
        }

        # Remove descriptions for tests which are not in our list
        foreach (keys(%test_description))
        {
                if (!defined($test_list{$_}))
                {
                        delete($test_description{$_});
                }
        }

        $after = scalar(keys(%test_description));
        if ($after < $before)
        {
                info("Removed ".($before - $after).
                     " unused descriptions, $after remaining.\n");
        }
}


#
# apply_prefix(filename, prefix)
#
# If FILENAME begins with PREFIX, remove PREFIX from FILENAME and return
# resulting string, otherwise return FILENAME.
#

sub apply_prefix($$)
{
        my $filename = $_[0];
        my $prefix = $_[1];

        if (defined($prefix) && ($prefix ne ""))
        {
                if ($filename =~ /^\Q$prefix\E\/(.*)$/)
                {
                        return substr($filename, length($prefix) + 1);
                }
        }

        return $filename;
}


#
# system_no_output(mode, parameters)
#
# Call an external program using PARAMETERS while suppressing depending on
# the value of MODE:
#
#   MODE & 1: suppress STDOUT
#   MODE & 2: suppress STDERR
#
# Return 0 on success, non-zero otherwise.
#

sub system_no_output($@)
{
        my $mode = shift;
        my $result;
        local *OLD_STDERR;
        local *OLD_STDOUT;

        # Save old stdout and stderr handles
        ($mode & 1) && open(OLD_STDOUT, ">>&", "STDOUT");
        ($mode & 2) && open(OLD_STDERR, ">>&", "STDERR");

        # Redirect to /dev/null
        ($mode & 1) && open(STDOUT, ">", "/dev/null");
        ($mode & 2) && open(STDERR, ">", "/dev/null");

        system(@_);
        $result = $?;

        # Close redirected handles
        ($mode & 1) && close(STDOUT);
        ($mode & 2) && close(STDERR);

        # Restore old handles
        ($mode & 1) && open(STDOUT, ">>&", "OLD_STDOUT");
        ($mode & 2) && open(STDERR, ">>&", "OLD_STDERR");

        return $result;
}


#
# read_config(filename)
#
# Read configuration file FILENAME and return a reference to a hash containing
# all valid key=value pairs found.
#

sub read_config($)
{
        my $filename = $_[0];
        my %result;
        my $key;
        my $value;
        local *HANDLE;

        if (!open(HANDLE, "<", $filename))
        {
                warn("WARNING: cannot read configuration file $filename\n");
                return undef;
        }
        while (<HANDLE>)
        {
                chomp;
                # Skip comments
                s/#.*//;
                # Remove leading blanks
                s/^\s+//;
                # Remove trailing blanks
                s/\s+$//;
                next unless length;
                ($key, $value) = split(/\s*=\s*/, $_, 2);
                if (defined($key) && defined($value))
                {
                        $result{$key} = $value;
                }
                else
                {
                        warn("WARNING: malformed statement in line $. ".
                             "of configuration file $filename\n");
                }
        }
        close(HANDLE);
        return \%result;
}


#
# apply_config(REF)
#
# REF is a reference to a hash containing the following mapping:
#
#   key_string => var_ref
#
# where KEY_STRING is a keyword and VAR_REF is a reference to an associated
# variable. If the global configuration hashes CONFIG or OPT_RC contain a value
# for keyword KEY_STRING, VAR_REF will be assigned the value for that keyword. 
#

sub apply_config($)
{
        my $ref = $_[0];

        foreach (keys(%{$ref}))
        {
                if (defined($opt_rc{$_})) {
                        ${$ref->{$_}} = $opt_rc{$_};
                } elsif (defined($config->{$_})) {
                        ${$ref->{$_}} = $config->{$_};
                }
        }
}


#
# get_html_prolog(FILENAME)
#
# If FILENAME is defined, return contents of file. Otherwise return default
# HTML prolog. Die on error.
#

sub get_html_prolog($)
{
        my $filename = $_[0];
        my $result = "";

        if (defined($filename))
        {
                local *HANDLE;

                open(HANDLE, "<", $filename)
                        or die("ERROR: cannot open html prolog $filename!\n");
                while (<HANDLE>)
                {
                        $result .= $_;
                }
                close(HANDLE);
        }
        else
        {
                $result = <<END_OF_HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html lang="en">

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=$charset">
  <title>\@pagetitle\@</title>
  <link rel="stylesheet" type="text/css" href="\@basedir\@gcov.css">
</head>

<body>

END_OF_HTML
                ;
        }

        return $result;
}


#
# get_html_epilog(FILENAME)
#
# If FILENAME is defined, return contents of file. Otherwise return default
# HTML epilog. Die on error.
#
sub get_html_epilog($)
{
        my $filename = $_[0];
        my $result = "";

        if (defined($filename))
        {
                local *HANDLE;

                open(HANDLE, "<", $filename)
                        or die("ERROR: cannot open html epilog $filename!\n");
                while (<HANDLE>)
                {
                        $result .= $_;
                }
                close(HANDLE);
        }
        else
        {
                $result = <<END_OF_HTML

</body>
</html>
END_OF_HTML
                ;
        }

        return $result;

}

sub warn_handler($)
{
        my ($msg) = @_;

        warn("$tool_name: $msg");
}

sub die_handler($)
{
        my ($msg) = @_;

        die("$tool_name: $msg");
}

#
# parse_ignore_errors(@ignore_errors)
#
# Parse user input about which errors to ignore.
#

sub parse_ignore_errors(@)
{
        my (@ignore_errors) = @_;
        my @items;
        my $item;

        return if (!@ignore_errors);

        foreach $item (@ignore_errors) {
                $item =~ s/\s//g;
                if ($item =~ /,/) {
                        # Split and add comma-separated parameters
                        push(@items, split(/,/, $item));
                } else {
                        # Add single parameter
                        push(@items, $item);
                }
        }
        foreach $item (@items) {
                my $item_id = $ERROR_ID{lc($item)};

                if (!defined($item_id)) {
                        die("ERROR: unknown argument for --ignore-errors: ".
                            "$item\n");
                }
                $ignore[$item_id] = 1;
        }
}

#
# rate(hit, found[, suffix, precision, width])
#
# Return the coverage rate [0..100] for HIT and FOUND values. 0 is only
# returned when HIT is 0. 100 is only returned when HIT equals FOUND.
# PRECISION specifies the precision of the result. SUFFIX defines a
# string that is appended to the result if FOUND is non-zero. Spaces
# are added to the start of the resulting string until it is at least WIDTH
# characters wide.
#

sub rate($$;$$$)
{
        my ($hit, $found, $suffix, $precision, $width) = @_;
        my $rate; 

        # Assign defaults if necessary
        $precision      = 1     if (!defined($precision));
        $suffix         = ""    if (!defined($suffix));
        $width          = 0     if (!defined($width));
        
        return sprintf("%*s", $width, "-") if (!defined($found) || $found == 0);
        $rate = sprintf("%.*f", $precision, $hit * 100 / $found);

        # Adjust rates if necessary
        if ($rate == 0 && $hit > 0) {
                $rate = sprintf("%.*f", $precision, 1 / 10 ** $precision);
        } elsif ($rate == 100 && $hit != $found) {
                $rate = sprintf("%.*f", $precision, 100 - 1 / 10 ** $precision);
        }

        return sprintf("%*s", $width, $rate.$suffix);
}