python script to remove BOM in java files

gistfile1.py

import os, sys, codecs

for dirpath, dirnames, filenames in os.walk('./mosorder'):
    # print dirpath, dirnames, filenames

    print 'dirpath = {}'.format(dirpath)

    for filename in filenames:
        if not filename.find('.java') > 0:
            continue

        # print 'filename = {}'.format(filename)

        path = '{}/{}'.format(dirpath, filename)
        print 'path = {}'.format(path)

        BUFSIZE = 4096
        BOMLEN = len(codecs.BOM_UTF8)

        # path = sys.argv[1]
        with open(path, "r+b") as fp:
            chunk = fp.read(BUFSIZE)
            if chunk.startswith(codecs.BOM_UTF8):
                i = 0
                chunk = chunk[BOMLEN:]
                while chunk:
                    fp.seek(i)
                    fp.write(chunk)
                    i += len(chunk)
                    fp.seek(BOMLEN, os.SEEK_CUR)
                    chunk = fp.read(BUFSIZE)
                fp.seek(-BOMLEN, os.SEEK_CUR)
                fp.truncate()
            fp.seek(0)
            fp.write(chunk)