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yajl-ruby/ext/yajl/yajl_buf.c
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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. | |
| */ | |
| #include "yajl_buf.h" | |
| #include <assert.h> | |
| #include <stdlib.h> | |
| #include <string.h> | |
| #define YAJL_BUF_INIT_SIZE 2048 | |
| struct yajl_buf_t { | |
| unsigned int len; | |
| unsigned int used; | |
| unsigned char * data; | |
| yajl_alloc_funcs * alloc; | |
| }; | |
| static | |
| void yajl_buf_ensure_available(yajl_buf buf, unsigned int want) | |
| { | |
| unsigned int 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, unsigned int 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; | |
| } | |
| unsigned int yajl_buf_len(yajl_buf buf) | |
| { | |
| return buf->used; | |
| } | |
| void | |
| yajl_buf_truncate(yajl_buf buf, unsigned int len) | |
| { | |
| assert(len <= buf->used); | |
| buf->used = len; | |
| } |