nghttp2/lib/spdylay_zlib.h

123 lines
4.0 KiB
C

/*
* Spdylay - SPDY Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef SPDYLAY_ZLIB_H
#define SPDYLAY_ZLIB_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <zlib.h>
#include "spdylay_buffer.h"
/* This structure is used for both deflater and inflater. */
typedef struct {
z_stream zst;
/* The protocol version to select the dictionary later. */
uint16_t version;
} spdylay_zlib;
/*
* Initializes |deflater| for deflating name/values pairs in the frame
* of the protocol version |version|. If the |comp| is zero,
* compression level becomes 0, which means no compression.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_ZLIB
* The z_stream initialization failed.
* SPDYLAY_ERR_UNSUPPORTED_VERSION
* The version is not supported.
*/
int spdylay_zlib_deflate_hd_init(spdylay_zlib *deflater, int comp,
uint16_t version);
/*
* Initializes |inflater| for inflating name/values pairs in the
* frame of the protocol version |version|.
*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_ZLIB
* The z_stream initialization failed.
* SPDYLAY_ERR_UNSUPPORTED_VERSION
* The version is not supported.
*/
int spdylay_zlib_inflate_hd_init(spdylay_zlib *inflater, uint16_t version);
/*
* Deallocates any resources allocated for |deflater|.
*/
void spdylay_zlib_deflate_free(spdylay_zlib *deflater);
/*
* Deallocates any resources allocated for |inflater|.
*/
void spdylay_zlib_inflate_free(spdylay_zlib *inflater);
/*
* Returns the maximum length when |len| bytes of data are deflated by
* |deflater|.
*/
size_t spdylay_zlib_deflate_hd_bound(spdylay_zlib *deflater, size_t len);
/*
* Deflates data stored in |in| with length |inlen|. The output is
* written to |out| with length |outlen|. This is not a strict
* requirement but |outlen| should have at least
* spdylay_zlib_deflate_hd_bound(|inlen|) bytes for successful
* operation.
*
* This function returns the number of bytes outputted if it succeeds,
* or one of the following negative error codes:
*
* SPDYLAY_ERR_ZLIB
* The deflate operation failed.
*/
ssize_t spdylay_zlib_deflate_hd(spdylay_zlib *deflater,
uint8_t *out, size_t outlen,
const uint8_t *in, size_t inlen);
/*
* Inflates data stored in |in| with length |inlen|. The output is
* added to |buf|.
*
* This function returns the number of bytes outputted if it succeeds,
* or one of the following negative error codes:
*
* SPDYLAY_ERR_ZLIB
* The inflate operation failed.
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
ssize_t spdylay_zlib_inflate_hd(spdylay_zlib *inflater,
spdylay_buffer* buf,
const uint8_t *in, size_t inlen);
#endif /* SPDYLAY_ZLIB_H */