DBI stream changes from r69 not valid in all pdb files

Hiya,

So the IMAGE_FILE_MACHINE field add in r69 isn't always set in files from the 
2003 and XP debugging symbol packs.  Since the enumeration doesn't include 0, 
tpi_vtypes.py will fail with:

Traceback (most recent call last):
  File "tpi_vtypes.py", line 139, in <module>
    pdb.STREAM_DBI.load()
  File "/home/mike/tmp/pdbparse/trunk/pdbparse/__init__.py", line 215, in load
    debug = dbi.parse_stream(self.stream_file)
  File "/home/mike/tmp/pdbparse/trunk/pdbparse/dbi.py", line 83, in parse_stream
    dbihdr = DBIHeader.parse_stream(stream)
  File "/usr/lib64/python2.7/site-packages/construct/core.py", line 129, in parse_stream
    return self._parse(stream, AttrDict())
  File "/usr/lib64/python2.7/site-packages/construct/core.py", line 553, in _parse
    subobj = sc._parse(stream, context)
  File "/usr/lib64/python2.7/site-packages/construct/core.py", line 181, in _parse
    return self._decode(self.subcon._parse(stream, context), context)
  File "/usr/lib64/python2.7/site-packages/construct/adapters.py", line 97, in _decode
    raise MappingError("no decoding mapping for %r"  % (obj,))
construct.adapters.MappingError: no decoding mapping for 0

I've attached a patch that allows an IMAGE_FILE_MACHINE value of 0, and gives a 
warning if it occurs requiring the user to specify an arch pointer size (since 
both x86 and x64 2003 pdbs have no machine setting, so we can't just default to 
4).

Original issue reported on code.google.com by mike.auty@gmail.com on 15 Mar 2012 at 10:08

Attachments:

pdbparse-dbi.patch

ohio813 / pdbparse

DBI stream changes from r69 not valid in all pdb files #8