PngImagePlugin.py 文件源码

def chunk_iCCP(self, pos, length):

        # ICC profile
        s = ImageFile._safe_read(self.fp, length)
        # according to PNG spec, the iCCP chunk contains:
        # Profile name  1-79 bytes (character string)
        # Null separator        1 byte (null character)
        # Compression method    1 byte (0)
        # Compressed profile    n bytes (zlib with deflate compression)
        i = s.find(b"\0")
        logger.debug("iCCP profile name %s", s[:i])
        logger.debug("Compression method %s", i8(s[i]))
        comp_method = i8(s[i])
        if comp_method != 0:
            raise SyntaxError("Unknown compression method %s in iCCP chunk" %
                              comp_method)
        try:
            icc_profile = _safe_zlib_decompress(s[i+2:])
        except zlib.error:
            icc_profile = None  # FIXME
        self.im_info["icc_profile"] = icc_profile
        return s