From 3ac3edcf95c5acd1644951e90bde9b0436f61fd7 Mon Sep 17 00:00:00 2001
From: Fred Drake <fdrake@acm.org>
Date: Tue, 9 May 2000 19:51:10 +0000
Subject: M.-A. Lemburg <mal@lemburg.com>: Added documentation and the missing
 PyCodec_StreamWriter API.

---
 Include/codecs.h | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 75 insertions(+), 7 deletions(-)

diff --git a/Include/codecs.h b/Include/codecs.h
index 257629d..708d476 100644
--- a/Include/codecs.h
+++ b/Include/codecs.h
@@ -15,37 +15,105 @@ Written by Marc-Andre Lemburg (mal@lemburg.com).
 
    ------------------------------------------------------------------------ */
 
+/* Register a new codec search function.
+
+   As side effect, this tries to load the encodings package, if not
+   yet done, to make sure that it is always first in the list of
+   search functions.
+
+   The search_function's refcount is incremented by this function. */
+
 extern DL_IMPORT(int) PyCodec_Register(
        PyObject *search_function
        );
 
+/* Codec register lookup API.
+
+   Looks up the given encoding and returns a tuple (encoder, decoder,
+   stream reader, stream writer) of functions which implement the
+   different aspects of processing the encoding.
+
+   The encoding string is looked up converted to all lower-case
+   characters. This makes encodings looked up through this mechanism
+   effectively case-insensitive.
+
+   If no codec is found, a KeyError is set and NULL returned. 
+
+   As side effect, this tries to load the encodings package, if not
+   yet done. This is part of the lazy load strategy for the encodings
+   package.
+
+ */
+
 extern DL_IMPORT(PyObject *) _PyCodec_Lookup(
        const char *encoding
        );
 
+/* 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 LookupError in case no encoder can be found.
+
+ */
+
+extern DL_IMPORT(PyObject *) PyCodec_Encode(
+       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 LookupError in case no encoder can be found.
+
+ */
+
+extern DL_IMPORT(PyObject *) PyCodec_Decode(
+       PyObject *object,
+       const char *encoding,
+       const char *errors
+       );
+
+/* --- Codec Lookup APIs -------------------------------------------------- 
+
+   All APIs return a codec object with incremented refcount and are
+   based on _PyCodec_Lookup().  The same comments w/r to the encoding
+   name also apply to these APIs.
+
+*/
+
+/* Get an encoder function for the given encoding. */
+
 extern DL_IMPORT(PyObject *) PyCodec_Encoder(
        const char *encoding
        );
 
+/* Get a decoder function for the given encoding. */
+
 extern DL_IMPORT(PyObject *) PyCodec_Decoder(
        const char *encoding
        );
 
+/* Get a StreamReader factory function for the given encoding. */
+
 extern DL_IMPORT(PyObject *) PyCodec_StreamReader(
        const char *encoding,
        PyObject *stream,
        const char *errors
        );
 
-extern DL_IMPORT(PyObject *) PyCodec_Encode(
-       PyObject *object,
-       const char *encoding,
-       const char *errors
-       );
+/* Get a StreamWriter factory function for the given encoding. */
 
-extern DL_IMPORT(PyObject *) PyCodec_Decode(
-       PyObject *object,
+extern DL_IMPORT(PyObject *) PyCodec_StreamWriter(
        const char *encoding,
+       PyObject *stream,
        const char *errors
        );
 
-- 
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