134 lines
3.6 KiB
Python
134 lines
3.6 KiB
Python
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import logging
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import argparse
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import struct
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def main():
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objects = []
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_ch = logging.StreamHandler()
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_ch.setLevel("DEBUG")
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_formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
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_ch.setFormatter(_formatter)
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logger = logging.getLogger(__name__)
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logger.addHandler(_ch)
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logger.setLevel("DEBUG")
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parser = argparse.ArgumentParser()
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parser.add_argument("gzp_file", help="gzp file to read")
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args = parser.parse_args()
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gzp_file = args.gzp_file
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logger.info("Opening "+gzp_file)
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with open(gzp_file, "rb") as gzp_fp:
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checksum = read_int(gzp_fp)
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if checksum != 0x6608F101:
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raise Exception("Invalid GZP checksum")
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logger.info("Checksum OK")
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meta_info_offset = read_int(gzp_fp)
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gzp_fp.seek(meta_info_offset)
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unk = read_int(gzp_fp)
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entries_count = read_int(gzp_fp)
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if entries_count == 0:
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logger.info("No entries found, skipping")
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return
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logger.info(str(entries_count)+" entries in GZP")
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for index in range(entries_count):
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logger.info("Reading index "+str(index))
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compressed_size = read_int(gzp_fp)
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original_size = read_int(gzp_fp)
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# original_size = read_int(gzp_fp)
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file_time = read_int(gzp_fp)
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content_offset = read_int(gzp_fp) + 16
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compression = read_byte(gzp_fp) # compression: 1 if compressed else 0
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name_length = read_byte(gzp_fp)
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name = read_bytes(gzp_fp, name_length).decode("utf8").strip('\x00')
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logger.info(name + " compression: "+str(compression) + ", filesize: "+sizeof_fmt(original_size) + ", start: "+str(content_offset))
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curr_pos = gzp_fp.tell()
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gzp_fp.seek(content_offset)
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buffer = gzp_fp.read(compressed_size)
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gzp_fp.seek(curr_pos)
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if compression == 1:
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logger.info("File is compressed, decompressing it")
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buffer = decompress(buffer, original_size)
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logger.info("Writing file "+name)
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with open(name, "wb") as entry_fp:
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entry_fp.write(buffer)
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# separator = read_byte(gzp_fp)
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def sizeof_fmt(num, suffix='B'):
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for unit in ['','Ki','Mi','Gi','Ti','Pi','Ei','Zi']:
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if abs(num) < 1024.0:
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return "%3.1f%s%s" % (num, unit, suffix)
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num /= 1024.0
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return "%.1f%s%s" % (num, 'Yi', suffix)
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def read_byte(fp):
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return struct.unpack("<B", fp.read(1))[0]
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def read_bytes(fp, num):
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return bytes(struct.unpack('<'+str(num)+'B', fp.read(num)))
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def read_int(fp):
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return struct.unpack("<L", fp.read(4))[0]
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def decompress(buffer, finalsize):
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i = 0
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j = 0
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decByte = 0
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decBits = 8
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buffStart = 0xFEE
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res = bytearray(finalsize)
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if finalsize == 0:
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return res
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while j < finalsize:
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if decBits == 8:
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decByte = buffer[i]
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i += 1
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decBits = 0
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if (decByte >> decBits & 1) == 0:
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decPos = ((buffer[i] + ((buffer[i + 1] & 0xF0) << 4) - buffStart - j) & 0xFFF) - 0x1000 + j
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decLen = (buffer[i + 1] & 0xF) + 3
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i += 2
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while decLen > 0:
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if decPos >= 0:
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# print("j:" +str(j))
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# print("decPos: "+str(decPos))
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res[j] = res[decPos]
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else:
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res[j] = 32
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j += 1
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decPos += 1
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decLen -= 1
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else:
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res[j] = buffer[i]
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i += 1
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j += 1
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decBits += 1
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return res
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if __name__ == '__main__':
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main()
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