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