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/*
This file is part of libmicrospdy
Copyright (C) 2012 Andrey Uzunov
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file compression.h
* @brief zlib handling functions
* @author Andrey Uzunov
*/
#ifndef COMPRESSION_H
#define COMPRESSION_H
#include "platform.h"
/* size of buffers used by zlib on (de)compressing */
#define SPDYF_ZLIB_CHUNK 16384
/**
* Initializes the zlib stream for compression. Must be called once
* for a session on initialization.
*
* @param strm Zlib stream on which we work
* @return SPDY_NO if zlib failed. SPDY_YES otherwise
*/
int
SPDYF_zlib_deflate_init(z_stream *strm);
/**
* Deinitializes the zlib stream for compression. Should be called once
* for a session on cleaning up.
*
* @param strm Zlib stream on which we work
*/
void
SPDYF_zlib_deflate_end(z_stream *strm);
/**
* Compressing stream with zlib.
*
* @param strm Zlib stream on which we work
* @param src stream of the data to be compressed
* @param src_size size of the data
* @param data_used the number of bytes from src_stream that were used
* TODO do we need
* @param dest the resulting compressed stream. Should be NULL. Must be
* freed later manually.
* @param dest_size size of the data after compression
* @return SPDY_NO if malloc or zlib failed. SPDY_YES otherwise
*/
int
SPDYF_zlib_deflate(z_stream *strm,
const void *src,
size_t src_size,
size_t *data_used,
void **dest,
size_t *dest_size);
/**
* Initializes the zlib stream for decompression. Must be called once
* for a session.
*
* @param strm Zlib stream on which we work
* @return SPDY_NO if zlib failed. SPDY_YES otherwise
*/
int
SPDYF_zlib_inflate_init(z_stream *strm);
/**
* Deinitializes the zlib stream for decompression. Should be called once
* for a session on cleaning up.
*
* @param strm Zlib stream on which we work
*/
void
SPDYF_zlib_inflate_end(z_stream *strm);
/**
* Decompressing stream with zlib.
*
* @param strm Zlib stream on which we work
* @param src stream of the data to be decompressed
* @param src_size size of the data
* @param dest the resulting decompressed stream. Should be NULL. Must
* be freed manually.
* @param dest_size size of the data after decompression
* @return SPDY_NO if malloc or zlib failed. SPDY_YES otherwise. If the
* function fails, the SPDY session must be closed
*/
int
SPDYF_zlib_inflate(z_stream *strm,
const void *src,
size_t src_size,
void **dest,
size_t *dest_size);
#endif
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