alyt_extract_sarc.py

gistfile1.txt

"""ALYT Splitter
* by hillexed
* Splits an ALYT into the Sarc file contained within and the ALYT header
* Given a file 00.ALYT this creates 00.ALYT.SARC and 00.ALYT.HEADER"""

version = 1.1

import sys

def getUnsignedBytes(bytestring, offset, numBytes=4):
    return int.from_bytes(bytestring[offset:offset+numBytes],byteorder='little')

def main():
    if(len(sys.argv) != 2):
        print("Usage: %s <alyt file>\n" % sys.argv[0])
        return 1

    with open(sys.argv[1],'rb') as fp:
        fileBuf = fp.read()

    fileSize = len(fileBuf)
   
    if(fileBuf[0:4] != b'ALYT'):
        return 1
    """
    ltblOff = getUnsignedBytes(fileBuf,0x8,4)
    lmtlOff = getUnsignedBytes(fileBuf,0x10,4)
    lfnlOff = getUnsignedBytes(fileBuf,0x18,4)
    ltblSize = getUnsignedBytes(fileBuf,0xC,4)
    lmtlSize = getUnsignedBytes(fileBuf,0x14,4)
    lfnlSize = getUnsignedBytes(fileBuf,0x1C,4)

    symbolTbl = getUnsignedBytes(fileBuf,0x20,4)
    numOfEntries = getUnsignedBytes(fileBuf,symbolTbl,4)"""

    sarcHeaderIndex = fileBuf.index(b"SARC")

    ALYTHeader = fileBuf[:sarcHeaderIndex]
    clippedFile = fileBuf[sarcHeaderIndex:]

    with open(sys.argv[1] + '.SARC','wb') as fp:
         fp.write(clippedFile)
    with open(sys.argv[1] + '.ALYT.HEADER','wb') as fp:
         fp.write(clippedFile)

    return 0

main()