def _parse_pdb_header(stream):
pdbheader = Storage()
# PDB fields
pdbheader.name, pdbheader.attributes, pdbheader.version, pdbheader.creation_timestamp, pdbheader.modification_timestamp, pdbheader.last_backup_timestamp, pdbheader.modification_number, pdbheader.appinfo_offset, pdbheader.sortinfo_offset, pdbheader.type, pdbheader.creator, pdbheader.uniqueidseed, pdbheader.nextrecordlistid, pdbheader.num_records, = struct.unpack(
">32sHHLLLLLL4s4sLLH", stream.read(78)
)
# record offsets and lengths
records = []
start = struct.unpack(">LBBBB", stream.read(8))[0]
for n in range(1, pdbheader.num_records):
next_start = struct.unpack(">LBBBB", stream.read(8))[0]
records.append((start, next_start - start))
start = next_start
stream.seek(0, 2)
end = stream.tell()
records.append((start, end - start))
pdbheader.records = records
# Clean up some of the fields
pdbheader.name = re.sub("[^-A-Za-z0-9'\";:,. ]+", "_", pdbheader.name.replace("\x00", ""))
return pdbheader
def _parse_exth_header (raw):
exth = Storage()
exth.identifier, \
exth.header_length, \
exth.record_count, \
= struct.unpack('>4sLL', raw[:12])
exthdata = raw[12:]
pos = 0
records = []
records_left = exth.record_count
while records_left > 0:
records_left -= 1
record = Storage()
record.type, \
record.length, \
= struct.unpack('>LL', exthdata[pos:pos + 8])
record.data = exthdata[pos+8:pos+record.length]
pos += record.length
records.append(record)
exth.records = records
return exth
