rename-to-hash.py

#!/usr/bin/env python

import os
import sys
from zlib import crc32


def crc(filename):
    MAX_FILE_SIZE = 1024 * 1024 * 1024 * 2  # 2 GiB
    if os.path.getsize(filename) > MAX_FILE_SIZE:
        return NotImplemented
    data = open(filename, 'rb').read()
    c = crc32(data)
    return '{:08X}'.format(c)


def main(filename):
    dirname = os.path.dirname(filename)
    basename = os.path.basename(filename)
    name, ext = os.path.splitext(basename)

    new_name = crc(filename)
    new_ext = ext.lower()
    new_basename = '{}{}'.format(new_name, new_ext)
    new_filename = os.path.join(dirname, new_basename)

    print('{} \t-> {}'.format(filename, new_filename))
    os.rename(filename, new_filename)


if __name__ == '__main__':
    filenames = sys.argv[1:]
    if not filenames:
        raise SystemExit('Usage: {} FILE [FILE]...'.format(__file__))

    for filename in filenames:
        main(filename)