Viewing file:  yajl_bytestack.h (3.37 KB) -rw-r--r--
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/*
* Copyright 2010, Lloyd Hilaiel.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. Neither the name of Lloyd Hilaiel nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* A header only implementation of a simple stack of bytes, used in YAJL
* to maintain parse state.
*/
#ifndef __YAJL_BYTESTACK_H__
#define __YAJL_BYTESTACK_H__
#include <limits.h>
#include <assert.h>
#include "api/yajl_common.h"
#define YAJL_BS_INC 128
#define YAJL_BS_MAX_SIZE UINT_MAX
typedef struct yajl_bytestack_t
{
unsigned char * stack;
unsigned int size;
unsigned int used;
yajl_alloc_funcs * yaf;
} yajl_bytestack;
/* initialize a bytestack */
#define yajl_bs_init(obs, _yaf) { \
(obs).stack = NULL; \
(obs).size = 0; \
(obs).used = 0; \
(obs).yaf = (_yaf); \
} \
/* initialize a bytestack */
#define yajl_bs_free(obs) \
if ((obs).stack) (obs).yaf->free((obs).yaf->ctx, (obs).stack);
#define yajl_bs_current(obs) \
(assert((obs).used > 0), (obs).stack[(obs).used - 1])
/* 0: success, 1: error */
static inline YAJL_WARN_UNUSED
int yajl_bs_push_inline(yajl_bytestack *obs, unsigned char byte) {
if ((obs->size - obs->used) == 0) {
if (obs->size > YAJL_BS_MAX_SIZE - YAJL_BS_INC)
return 1;
obs->size += YAJL_BS_INC;
obs->stack = obs->yaf->realloc(obs->yaf->ctx, (void *)obs->stack, obs->size);
if (!obs->stack)
return 1;
}
obs->stack[obs->used++] = byte;
return 0;
}
#define yajl_bs_push(obs, byte) yajl_bs_push_inline(&(obs), (byte))
/* removes the top item of the stack, returns nothing */
#define yajl_bs_pop(obs) { ((obs).used)--; }
static inline
void
yajl_bs_set_inline(yajl_bytestack *obs, unsigned char byte) {
assert(obs->used > 0);
assert(obs->size >= obs->used);
obs->stack[obs->used - 1] = byte;
}
#define yajl_bs_set(obs, byte) yajl_bs_set_inline(&obs, byte)
#endif
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