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/*
* Copyright (c) 2007-2014, Lloyd Hilaiel <me@lloyd.io>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "yajl_buf.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#define YAJL_BUF_INIT_SIZE 2048
struct yajl_buf_t {
size_t len;
size_t used;
unsigned char * data;
yajl_alloc_funcs * alloc;
};
static
void yajl_buf_ensure_available(yajl_buf buf, size_t want)
{
size_t need;
assert(buf != NULL);
/* first call */
if (buf->data == NULL) {
buf->len = YAJL_BUF_INIT_SIZE;
buf->data = (unsigned char *) YA_MALLOC(buf->alloc, buf->len);
buf->data[0] = 0;
}
need = buf->len;
while (want >= (need - buf->used)) need <<= 1;
if (need != buf->len) {
buf->data = (unsigned char *) YA_REALLOC(buf->alloc, buf->data, need);
buf->len = need;
}
}
yajl_buf yajl_buf_alloc(yajl_alloc_funcs * alloc)
{
yajl_buf b = YA_MALLOC(alloc, sizeof(struct yajl_buf_t));
memset((void *) b, 0, sizeof(struct yajl_buf_t));
b->alloc = alloc;
return b;
}
void yajl_buf_free(yajl_buf buf)
{
assert(buf != NULL);
if (buf->data) YA_FREE(buf->alloc, buf->data);
YA_FREE(buf->alloc, buf);
}
void yajl_buf_append(yajl_buf buf, const void * data, size_t len)
{
yajl_buf_ensure_available(buf, len);
if (len > 0) {
assert(data != NULL);
memcpy(buf->data + buf->used, data, len);
buf->used += len;
buf->data[buf->used] = 0;
}
}
void yajl_buf_clear(yajl_buf buf)
{
buf->used = 0;
if (buf->data) buf->data[buf->used] = 0;
}
const unsigned char * yajl_buf_data(yajl_buf buf)
{
return buf->data;
}
size_t yajl_buf_len(yajl_buf buf)
{
return buf->used;
}
size_t yajl_buf_capacity(yajl_buf buf)
{
return buf->len;
}
void
yajl_buf_truncate(yajl_buf buf, size_t len)
{
assert(len <= buf->used);
buf->used = len;
}
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