def parse_header():
header = buffer[:header_size()]
(magic_header, header_checksum, filetable_checksum, version, nb_files,
data_size) = struct.unpack(header_structure(), header)
magic_header = magic_header.decode('utf-8')
archive = {"version": version}
if magic_header != 'WRPGPIAF':
raise ParserMagicHeaderError('Bad Magic Header')
calculated_header_checksum = zlib.crc32(
buffer[header_check_size():header_check_size() +
header_data_size()]) & 0xffffffff
if calculated_header_checksum != header_checksum:
raise ParserChecksumError('Bad Header Checksum : {} != {}'.format(
calculated_header_checksum, header_checksum))
calculated_file_table_checksum = zlib.crc32(
buffer[header_size():header_size() +
nb_files * file_entry_size()]) & 0xffffffff
if calculated_file_table_checksum != filetable_checksum:
raise ParserChecksumError(
'Bad Filetable Checksum : {} != {}'.format(
calculated_file_table_checksum, filetable_checksum))
if len(buffer) != data_size + get_data_offset(nb_files):
raise ParserDatasizeError('Bad Data Size')
return archive, nb_files
def pack_header(archive, packed_filetable):
structure = header_structure()
data_size = sum([len(f["data"]) for f in archive["file_entries"]])
header_data = struct.pack(header_data_structure(), archive["version"],
len(archive["file_entries"]), data_size)
return struct.pack(structure, b"WRPGPIAF", zlib.crc32(header_data),
zlib.crc32(packed_filetable), archive["version"],
len(archive["file_entries"]), data_size)
def pack_header(archive, packed_filetable):
structure = header_structure()
data_size = sum([len(f["data"]) for f in archive["file_entries"]])
header_data = struct.pack(header_data_structure(), archive["version"], len(archive["file_entries"]), data_size)
return struct.pack(structure,
b"WRPGPIAF",
zlib.crc32(header_data),
zlib.crc32(packed_filetable),
archive["version"],
len(archive["file_entries"]),
data_size
)
def parse_header():
header = buffer[:header_size()]
( magic_header,
header_checksum,
filetable_checksum,
version,
nb_files,
data_size ) = struct.unpack(header_structure(), header)
magic_header = magic_header.decode('utf-8')
archive = {
"version": version }
if magic_header != 'WRPGPIAF':
raise ParserMagicHeaderError('Bad Magic Header')
calculated_header_checksum = zlib.crc32(buffer[
header_check_size()
:header_check_size()+header_data_size() ]) & 0xffffffff
if calculated_header_checksum != header_checksum:
raise ParserChecksumError('Bad Header Checksum : {} != {}'
.format(calculated_header_checksum, header_checksum))
calculated_file_table_checksum = zlib.crc32(buffer[
header_size()
:header_size()+nb_files*file_entry_size()]
) & 0xffffffff
if calculated_file_table_checksum != filetable_checksum:
raise ParserChecksumError('Bad Filetable Checksum : {} != {}'
.format(calculated_file_table_checksum, filetable_checksum))
if len(buffer) != data_size + get_data_offset(nb_files):
raise ParserDatasizeError('Bad Data Size')
return archive, nb_files
