reporter.py 文件源码

def remove_bom(filename):
    if os.path.isfile(filename):
        f = open(filename, 'rb')

        # read first 4 bytes
        header = f.read(4)

        # check for BOM
        bom_len = 0
        encodings = [(codecs.BOM_UTF32, 4),
                     (codecs.BOM_UTF16, 2),
                     (codecs.BOM_UTF8, 3)]

        # remove appropriate number of bytes
        for h, l in encodings:
            if header.startswith(h):
                bom_len = l
                break
        f.seek(0)
        f.read(bom_len)
        return f