BeOS/ar-1.1/docs/dumpo.py

   1 #! /bin/env python
   2 """ Dump data about a Metrowerks object file.
   3
   4 Based on reverse-engineering the library file format, since the docs are
   5 wrong.
   6
   7 Copyright (C) 1997 Chris Herborth (chrish@qnx.com)
   8 """
   9
  10 # ----------------------------------------------------------------------
  11 # Standard modules
  12 import sys, getopt, string, time
  13
  14 # ----------------------------------------------------------------------
  15 # Extra goodies
  16 from dumpar import mk_long, str2hex, print_offset, get_string
  17
  18 # ----------------------------------------------------------------------
  19 def mk_short( str ):
  20         """ convert a 2-byte string into a number
  21
  22         Assumes big-endian!
  23         """
  24         if len( str ) < 2:
  25                 raise ValueError, "str must be 2 bytes long"
  26
  27         num = ord( str[1] )
  28         num = num + ord( str[0] ) * 0x100
  29
  30         return num
  31
  32 # ----------------------------------------------------------------------
  33 def usage():
  34         """ Display a usage message and exit.
  35         """
  36         print "dumpo [-v] object1 [object2 ... objectn]"
  37         print
  38         print "Attempt to display some useful information about the contents"
  39         print "of the given Metrowerks object file(s)."
  40         print
  41         print "-v        Be verbose (displays offsets along with the data)"
  42         raise SystemExit
  43
  44 # ----------------------------------------------------------------------
  45 def dump_o( file, verbose ):
  46         """ dump information about a Metrowerks object file
  47
  48         Note that there is more info there, 6 more quads before the file name.
  49         """
  50         offset = 0
  51
  52         print "Dumping object:", file
  53
  54         # Attempt to read the data.
  55         try:
  56                 data = open( file ).read()
  57         except IOError, retval:
  58                 print "*** Unable to open file %s: %s" % ( file, retval[1] )
  59                 return
  60
  61         # Check the magic number.
  62         if verbose:
  63                 print_offset( offset )
  64         print "Magic:",
  65         magic = data[offset:offset + 8]
  66         print "'%s'" % ( magic )
  67         if magic != "MWOBPPC ":
  68                 print "*** Invalid magic  number!"
  69                 return
  70
  71         offset = offset + 8
  72
  73         # version
  74         if verbose:
  75                 print_offset( offset )
  76         print "version:", mk_long( data[offset:offset + 4] )
  77         offset = offset + 4
  78
  79         # flags
  80         if verbose:
  81                 print_offset( offset )
  82         print "flags:", str2hex( data[offset:offset + 4] )
  83         offset = offset + 4
  84
  85         # code size
  86         if verbose:
  87                 print_offset( offset )
  88         print "code size:", mk_long( data[offset:offset + 4] )
  89         offset = offset + 4
  90
  91         # data size
  92         if verbose:
  93                 print_offset( offset )
  94         print "data size:", mk_long( data[offset:offset + 4] )
  95         offset = offset + 4
  96
  97 # ----------------------------------------------------------------------
  98 def main():
  99         """ mainline
 100         """
 101
 102         # Set up some defaults
 103         be_verbose = 0
 104
 105         # First, check the command-line arguments
 106         try:
 107                 opt, args = getopt.getopt( sys.argv[1:], "vh?" )
 108         except getopt.error:
 109                 print "*** Error parsing command-line options!"
 110                 usage()
 111
 112         for o in opt:
 113                 if o[0] == "-h" or o[0] == "-?":
 114                         usage()
 115                 elif o[0] == "-v":
 116                         be_verbose = 1
 117                 else:
 118                         print "*** Unknown command-line option!"
 119                         usage()
 120
 121         # Now we can attempt to dump info about the arguments.
 122         for obj in args:
 123                 dump_o( obj, be_verbose )
 124
 125 if __name__ == "__main__":
 126         main()