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.. _codec-registry: Codec registry and support functions ==================================== .. c:function:: int PyCodec_Register(PyObject *search_function) Register a new codec search function. As side effect, this tries to load the :mod:`encodings` package, if not yet done, to make sure that it is always first in the list of search functions. .. c:function:: int PyCodec_KnownEncoding(const char *encoding) Return ``1`` or ``0`` depending on whether there is a registered codec for the given *encoding*. .. c:function:: PyObject* PyCodec_Encode(PyObject *object, const char *encoding, const char *errors) Generic codec based encoding API. *object* is passed through the encoder function found for the given *encoding* using the error handling method defined by *errors*. *errors* may be *NULL* to use the default method defined for the codec. Raises a :exc:`LookupError` if no encoder can be found. .. c:function:: PyObject* PyCodec_Decode(PyObject *object, const char *encoding, const char *errors) Generic codec based decoding API. *object* is passed through the decoder function found for the given *encoding* using the error handling method defined by *errors*. *errors* may be *NULL* to use the default method defined for the codec. Raises a :exc:`LookupError` if no encoder can be found. Codec lookup API ---------------- In the following functions, the *encoding* string is looked up converted to all lower-case characters, which makes encodings looked up through this mechanism effectively case-insensitive. If no codec is found, a :exc:`KeyError` is set and *NULL* returned. .. c:function:: PyObject* PyCodec_Encoder(const char *encoding) Get an encoder function for the given *encoding*. .. c:function:: PyObject* PyCodec_Decoder(const char *encoding) Get a decoder function for the given *encoding*. .. c:function:: PyObject* PyCodec_IncrementalEncoder(const char *encoding, const char *errors) Get an :class:`~codecs.IncrementalEncoder` object for the given *encoding*. .. c:function:: PyObject* PyCodec_IncrementalDecoder(const char *encoding, const char *errors) Get an :class:`~codecs.IncrementalDecoder` object for the given *encoding*. .. c:function:: PyObject* PyCodec_StreamReader(const char *encoding, PyObject *stream, const char *errors) Get a :class:`~codecs.StreamReader` factory function for the given *encoding*. .. c:function:: PyObject* PyCodec_StreamWriter(const char *encoding, PyObject *stream, const char *errors) Get a :class:`~codecs.StreamWriter` factory function for the given *encoding*. Registry API for Unicode encoding error handlers ------------------------------------------------ .. c:function:: int PyCodec_RegisterError(const char *name, PyObject *error) Register the error handling callback function *error* under the given *name*. This callback function will be called by a codec when it encounters unencodable characters/undecodable bytes and *name* is specified as the error parameter in the call to the encode/decode function. The callback gets a single argument, an instance of :exc:`UnicodeEncodeError`, :exc:`UnicodeDecodeError` or :exc:`UnicodeTranslateError` that holds information about the problematic sequence of characters or bytes and their offset in the original string (see :ref:`unicodeexceptions` for functions to extract this information). The callback must either raise the given exception, or return a two-item tuple containing the replacement for the problematic sequence, and an integer giving the offset in the original string at which encoding/decoding should be resumed. Return ``0`` on success, ``-1`` on error. .. c:function:: PyObject* PyCodec_LookupError(const char *name) Lookup the error handling callback function registered under *name*. As a special case *NULL* can be passed, in which case the error handling callback for "strict" will be returned. .. c:function:: PyObject* PyCodec_StrictErrors(PyObject *exc) Raise *exc* as an exception. .. c:function:: PyObject* PyCodec_IgnoreErrors(PyObject *exc) Ignore the unicode error, skipping the faulty input. .. c:function:: PyObject* PyCodec_ReplaceErrors(PyObject *exc) Replace the unicode encode error with ``?`` or ``U+FFFD``. .. c:function:: PyObject* PyCodec_XMLCharRefReplaceErrors(PyObject *exc) Replace the unicode encode error with XML character references. .. c:function:: PyObject* PyCodec_BackslashReplaceErrors(PyObject *exc) Replace the unicode encode error with backslash escapes (``\x``, ``\u`` and ``\U``). .. c:function:: PyObject* PyCodec_NameReplaceErrors(PyObject *exc) Replace the unicode encode error with ``\N{...}`` escapes. .. versionadded:: 3.5