#!/usr/bin/env python3

import sys
import struct

WORD_BE = struct.Struct(">I")
WORD_LE = struct.Struct("<I")

if __name__ == "__main__":
    if len(sys.argv) < 3:
        print("usage: xilswap.py <in> <out>")

    with open(sys.argv[1], "rb") as f:
        data = f.read()

    assert(len(data) % 4 == 0)

    print("total", len(data)//4)
    with open(sys.argv[2], "wb") as f:
        for i in range(len(data)//4):
            word = WORD_BE.unpack(data[i*4:i*4+4])[0]
            f.write(WORD_LE.pack(word))
            if i % 10000 == 0:
                print(i, "/", len(data)//4)