kdat/TarParser.cpp

   1 // KDat - a tar-based DAT archiver
   2 // Copyright (C) 1998-2000  Sean Vyain, svyain@mail.tds.net
   3 // Copyright (C) 2001-2002  Lawrence Widman, kdat@cardiothink.com
   4 //
   5 // This program is free software; you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation; either version 2 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with this program; if not, write to the Free Software
  17 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18
  19 #include "TarParser.h"
  20
  21 #include "TarParser.moc"
  22
  23 TarParser::TarParser()
  24         : _bufIdx( 0 ),
  25           _blocksToSkip( 0 ),
  26           _record( 0 ),
  27           _longname( FALSE ),
  28           _extended( FALSE ),
  29           _archnameIdx( 0 )
  30 {
  31 }
  32
  33 void TarParser::slotData( const char * data, int length )
  34 {
  35     for ( int i = 0; i < length; i++ ) {
  36         if ( _bufIdx >= 512 ) {
  37             if ( _blocksToSkip > 0 ) {
  38                 if ( _extended ) {
  39                     record* rec = (record*)_buf;
  40                     _extended = rec->ext_hdr.isextended;
  41                 } else {
  42                     _blocksToSkip--;
  43                     if ( _longname ) {
  44                         memcpy( _archname + _archnameIdx, _buf, 512 );
  45                         _archnameIdx += 512;
  46                     }
  47                 }
  48             } else {
  49                 parseTarBlock();
  50             }
  51             _bufIdx = 0;
  52             _record++;
  53         }
  54         _buf[_bufIdx++] = data[i];
  55     }
  56 }
  57
  58 int TarParser::parseOctal( const char* buf, int length )
  59 {
  60     int val = 0;
  61
  62     for ( int i = 0; i < length; i++ ) {
  63         val *= 8;
  64         if ( ( buf[i] >= '1' ) && ( buf[i] <= '7' ) ) {
  65             val += buf[i] - '0';
  66         }
  67     }
  68
  69     return val;
  70 }
  71
  72 void TarParser::parseTarBlock()
  73 {
  74     record* rec = (record*)_buf;
  75
  76 #if 0
  77     printf( "----- parsing tar block -----\n" );
  78     printf( "arch_name     = '%s'\n", rec->header.arch_name );
  79     printf( "mode          = '%s'\n", rec->header.mode );
  80     printf( "uid           = %d\n", parseOctal( rec->header.uid, 6 ) );
  81     printf( "gid           = %d\n", parseOctal( rec->header.gid, 6 ) );
  82     printf( "size          = %d\n", parseOctal( rec->header.size, 11 ) );
  83     printf( "mtime         = %d\n", parseOctal( rec->header.mtime, 11 ) );
  84     printf( "chksum        = '%s'\n", rec->header.chksum );
  85     printf( "linkflag      = '%c'\n", rec->header.linkflag );
  86     printf( "arch_linkname = '%s'\n", rec->header.arch_linkname );
  87     printf( "magic         = '%s'\n", rec->header.magic );
  88     printf( "uname         = '%s'\n", rec->header.uname );
  89     printf( "gname         = '%s'\n", rec->header.gname );
  90     printf( "devmajor      = %d\n", parseOctal( rec->header.devmajor, 8 ) );
  91     printf( "devminor      = %d\n", parseOctal( rec->header.devminor, 8 ) );
  92     printf( "atime         = %d\n", parseOctal( rec->header.atime, 11 ) );
  93     printf( "ctime         = %d\n", parseOctal( rec->header.ctime, 11 ) );
  94     printf( "offset        = %d\n", parseOctal( rec->header.offset, 11 ) );
  95     printf( "longnames     = '%s'\n", rec->header.longnames );
  96     printf( "isextended    = %d\n", rec->header.isextended );
  97     printf( "realsize      = %d\n", parseOctal( rec->header.realsize, 11 ) );
  98 #endif
  99
 100     if ( rec->header.magic[0] != 0 ) {
 101         _blocksToSkip = ( parseOctal( rec->header.size, 11 ) + 511 ) / 512;
 102         _extended = rec->header.isextended;
 103
 104         if ( rec->header.linkflag == LF_LONGNAME ) {
 105             // The actual file name is stored in the next _blocksToSkip blocks of the tar-file.
 106             _longname = TRUE;
 107             _archnameIdx = 0;
 108         } else {
 109             if ( _longname ) {
 110                 _longname = FALSE;
 111                 emit sigEntry( _archname, parseOctal( rec->header.size, 11 ), parseOctal( rec->header.mtime, 11 ), _record );
 112             } else {
 113                 emit sigEntry( rec->header.arch_name, parseOctal( rec->header.size, 11 ), parseOctal( rec->header.mtime, 11 ), _record );
 114             }
 115         }
 116     }
 117 }