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spdylay/lib/spdylay_helper.h

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/*
* 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_HELPER_H
#define SPDYLAY_HELPER_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <spdylay/spdylay.h>
#define spdylay_min(A, B) ((A) < (B) ? (A) : (B))
#define spdylay_max(A, B) ((A) > (B) ? (A) : (B))
/*
* Copies 2 byte unsigned integer |n| in host byte order to |buf| in
* network byte order.
*/
void spdylay_put_uint16be(uint8_t *buf, uint16_t n);
/*
* Copies 4 byte unsigned integer |n| in host byte order to |buf| in
* network byte order.
*/
void spdylay_put_uint32be(uint8_t *buf, uint32_t n);
/*
* Retrieves 2 byte unsigned integer stored in |data| in network byte
* order and returns it in host byte order.
*/
uint16_t spdylay_get_uint16(const uint8_t *data);
/*
* Retrieves 4 byte unsigned integer stored in |data| in network byte
* order and returns it in host byte order.
*/
uint32_t spdylay_get_uint32(const uint8_t *data);
/*
* Ensures that buffer |*buf_ptr| with |*buflen_ptr| length has at
* least |min_length| bytes. If |min_length| > |*buflen_ptr|,
* allocates new buffer having at least |min_length| bytes and assigns
* its pointer to |*buf_ptr| and allocated number of bytes to
* |*buflen_ptr|. The memory pointed by |*buf_ptr| previously is
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* freed. No memory copy is done between old and new buffer.
* |*buf_ptr| and |*buflen_ptr| are only updated iff this function
* succeeds.
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*
* This function returns 0 if it succeeds, or one of the following
* negative error codes:
*
* SPDYLAY_ERR_NOMEM
* Out of memory.
*/
int spdylay_reserve_buffer(uint8_t **buf_ptr, size_t *buflen_ptr,
size_t min_length);
#endif /* SPDYLAY_HELPER_H */