md5sign.py

linux下的一款播放器

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"""Creates unique MD5 signatures for files."""

import os
import sys
import md5


def hexify(s):
    return "%02x"*len(s) % tuple(map(ord, s))


def md5_fingerprint(filename):
    if filename == '-':
        filehandle = sys.stdin
    else:
        try:
            filehandle = open(filename, 'rb')
        except IOError:
            # not a file
            return 0

    m = md5.new()
    while 1:
        str = filehandle.read(4096)
        if not str:
            break
        m.update(str)

    return 'MD5 (%s)%s%s' % (
        filename, '.'*(32 - len(filename)), hexify(m.digest()))


if __name__ == '__main__':
    ## if there are no arguments, then sign everything in the current directory
    ## otherwise sign only the files in the argument list


    if len(sys.argv) == 1:
        dir_list = os.listdir(os.curdir)
        dir_list.sort()
        for fn in dir_list:
            md5digest = md5_fingerprint(fn)
            if md5digest: print md5digest
    else:
        for fn in sys.argv[1:]:
            md5digest = md5_fingerprint(fn)
            if md5digest: print md5digest