Can you make a tool that can repack custom data into Conflict: Desert Storm (PC) *.dat?

Ekey already made an unpacker: https://github.com/Ekey/CE.DAT.Tool

catalog.zip

Spoiler

import os
import struct

def str2hex(s:str)->bytes:
    b = b''
    hexstring = '0123456789ABCDEF'
    s = s.zfill(8)
    for c in range(0,len(s)-1,2):
        n1 = hexstring.find(s[c])<<4
        n2 = hexstring.find(s[c+1])
        b += struct.pack('B', n1+n2)
    return b
    
def extract(fname):
    """extracts Conflict: Desert Storm (PC) *.dat files into dir/*.*"""
    directory = fname.lower().replace('.dat', '/')
    table = []
    if not os.path.isdir(directory):
        os.mkdir(directory)
    with open(fname, 'rb') as f:
        while True:
            stream = f.read(12)
            if stream == b'\x00'*12:
                break
            hashed, offset, size = struct.unpack('III', stream)
            hashed = hex(hashed).lstrip('0x').upper().zfill(8)
            table.append((hashed, offset, size))
        for file in table:
            hashed, offset, size = file
            path = directory+hashed
            with open(path, 'wb') as f2:
                f.seek(offset)
                f2.write(f.read(size))
                print(f'Extracted: {hashed}')
                

def import_(directory):
    """import directory into Conflict: Desert Storm (PC) *.dat file"""
    fname = directory.rstrip('/').rstrip('\r')+'.dat'
    tablesize = 0x800
    table = []
    files = os.listdir(directory)
    offset = tablesize
    archive = b''
    print('Checking filenames...')
    for file in files:
        for c in file:
            if not c in '0123456789ABCDEF':
                raise Exception(f"{file} aren't correct filename.")
        with open(directory+'/'+file, 'rb') as f:
            f = f.read()
            size = len(f)
            table.append((file, offset, size))
            archive += f
            offset += size
    print('Writing dat file table...')
    with open(fname, 'wb') as f2:
        zeros = tablesize - (len(table) * 12)
        for file in table:
            fname, offset, size = file
            fname = str2hex(fname)
            offset = struct.pack('I', offset)
            size = struct.pack('I', size)
            f2.write(fname+offset+size)
        f2.write(b'\x00'*zeros) #padding
        print('Writing all files...')
        f2.write(archive)

        
def main():
    print('Conflict: Desert Storm (PC) Dat Tool')
    inp = input('Use [e] to extract from file, and to import compile file.\n:  ')
    while True:
        match inp:
            case 'e':
                inp = input('Input filename:  ')
                extract(inp)
                break
            case 'i':
                inp = input('Input directory:  ')
                import_(inp)
                break
            case _:
                print('try again')

if __name__ == '__main__':
    main()
    input('done!')

python code