Rolf Meyer
yajl - JSON library working with the compiler. URL: http://lloyd.github.com/yajl/
yajl/core/yajl_buf.c@0:34f4a53d4ca3, 2009-11-18 (annotated)
- Committer:
- rolf
- Date:
- Wed Nov 18 17:56:51 2009 +0000
- Revision:
- 0:34f4a53d4ca3
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| rolf | 0:34f4a53d4ca3 | 1 | /* |
| rolf | 0:34f4a53d4ca3 | 2 | * Copyright 2007-2009, Lloyd Hilaiel. |
| rolf | 0:34f4a53d4ca3 | 3 | * |
| rolf | 0:34f4a53d4ca3 | 4 | * Redistribution and use in source and binary forms, with or without |
| rolf | 0:34f4a53d4ca3 | 5 | * modification, are permitted provided that the following conditions are |
| rolf | 0:34f4a53d4ca3 | 6 | * met: |
| rolf | 0:34f4a53d4ca3 | 7 | * |
| rolf | 0:34f4a53d4ca3 | 8 | * 1. Redistributions of source code must retain the above copyright |
| rolf | 0:34f4a53d4ca3 | 9 | * notice, this list of conditions and the following disclaimer. |
| rolf | 0:34f4a53d4ca3 | 10 | * |
| rolf | 0:34f4a53d4ca3 | 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| rolf | 0:34f4a53d4ca3 | 12 | * notice, this list of conditions and the following disclaimer in |
| rolf | 0:34f4a53d4ca3 | 13 | * the documentation and/or other materials provided with the |
| rolf | 0:34f4a53d4ca3 | 14 | * distribution. |
| rolf | 0:34f4a53d4ca3 | 15 | * |
| rolf | 0:34f4a53d4ca3 | 16 | * 3. Neither the name of Lloyd Hilaiel nor the names of its |
| rolf | 0:34f4a53d4ca3 | 17 | * contributors may be used to endorse or promote products derived |
| rolf | 0:34f4a53d4ca3 | 18 | * from this software without specific prior written permission. |
| rolf | 0:34f4a53d4ca3 | 19 | * |
| rolf | 0:34f4a53d4ca3 | 20 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| rolf | 0:34f4a53d4ca3 | 21 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| rolf | 0:34f4a53d4ca3 | 22 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| rolf | 0:34f4a53d4ca3 | 23 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
| rolf | 0:34f4a53d4ca3 | 24 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| rolf | 0:34f4a53d4ca3 | 25 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| rolf | 0:34f4a53d4ca3 | 26 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| rolf | 0:34f4a53d4ca3 | 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| rolf | 0:34f4a53d4ca3 | 28 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| rolf | 0:34f4a53d4ca3 | 29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| rolf | 0:34f4a53d4ca3 | 30 | * POSSIBILITY OF SUCH DAMAGE. |
| rolf | 0:34f4a53d4ca3 | 31 | */ |
| rolf | 0:34f4a53d4ca3 | 32 | |
| rolf | 0:34f4a53d4ca3 | 33 | #ifdef __cplusplus |
| rolf | 0:34f4a53d4ca3 | 34 | extern "C" { |
| rolf | 0:34f4a53d4ca3 | 35 | #endif |
| rolf | 0:34f4a53d4ca3 | 36 | |
| rolf | 0:34f4a53d4ca3 | 37 | #include "yajl_buf.h" |
| rolf | 0:34f4a53d4ca3 | 38 | |
| rolf | 0:34f4a53d4ca3 | 39 | #include <assert.h> |
| rolf | 0:34f4a53d4ca3 | 40 | #include <stdlib.h> |
| rolf | 0:34f4a53d4ca3 | 41 | #include <string.h> |
| rolf | 0:34f4a53d4ca3 | 42 | |
| rolf | 0:34f4a53d4ca3 | 43 | #define YAJL_BUF_INIT_SIZE 2048 |
| rolf | 0:34f4a53d4ca3 | 44 | |
| rolf | 0:34f4a53d4ca3 | 45 | struct yajl_buf_t { |
| rolf | 0:34f4a53d4ca3 | 46 | unsigned int len; |
| rolf | 0:34f4a53d4ca3 | 47 | unsigned int used; |
| rolf | 0:34f4a53d4ca3 | 48 | unsigned char * data; |
| rolf | 0:34f4a53d4ca3 | 49 | yajl_alloc_funcs * alloc; |
| rolf | 0:34f4a53d4ca3 | 50 | }; |
| rolf | 0:34f4a53d4ca3 | 51 | |
| rolf | 0:34f4a53d4ca3 | 52 | static |
| rolf | 0:34f4a53d4ca3 | 53 | void yajl_buf_ensure_available(yajl_buf buf, unsigned int want) |
| rolf | 0:34f4a53d4ca3 | 54 | { |
| rolf | 0:34f4a53d4ca3 | 55 | unsigned int need; |
| rolf | 0:34f4a53d4ca3 | 56 | |
| rolf | 0:34f4a53d4ca3 | 57 | assert(buf != NULL); |
| rolf | 0:34f4a53d4ca3 | 58 | |
| rolf | 0:34f4a53d4ca3 | 59 | /* first call */ |
| rolf | 0:34f4a53d4ca3 | 60 | if (buf->data == NULL) { |
| rolf | 0:34f4a53d4ca3 | 61 | buf->len = YAJL_BUF_INIT_SIZE; |
| rolf | 0:34f4a53d4ca3 | 62 | buf->data = (unsigned char *) YA_MALLOC(buf->alloc, buf->len); |
| rolf | 0:34f4a53d4ca3 | 63 | buf->data[0] = 0; |
| rolf | 0:34f4a53d4ca3 | 64 | } |
| rolf | 0:34f4a53d4ca3 | 65 | |
| rolf | 0:34f4a53d4ca3 | 66 | need = buf->len; |
| rolf | 0:34f4a53d4ca3 | 67 | |
| rolf | 0:34f4a53d4ca3 | 68 | while (want >= (need - buf->used)) need <<= 1; |
| rolf | 0:34f4a53d4ca3 | 69 | |
| rolf | 0:34f4a53d4ca3 | 70 | if (need != buf->len) { |
| rolf | 0:34f4a53d4ca3 | 71 | buf->data = (unsigned char *) YA_REALLOC(buf->alloc, buf->data, need); |
| rolf | 0:34f4a53d4ca3 | 72 | buf->len = need; |
| rolf | 0:34f4a53d4ca3 | 73 | } |
| rolf | 0:34f4a53d4ca3 | 74 | } |
| rolf | 0:34f4a53d4ca3 | 75 | |
| rolf | 0:34f4a53d4ca3 | 76 | yajl_buf yajl_buf_alloc(yajl_alloc_funcs * alloc) |
| rolf | 0:34f4a53d4ca3 | 77 | { |
| rolf | 0:34f4a53d4ca3 | 78 | yajl_buf b = (yajl_buf)YA_MALLOC(alloc, sizeof(struct yajl_buf_t)); |
| rolf | 0:34f4a53d4ca3 | 79 | memset((void *) b, 0, sizeof(struct yajl_buf_t)); |
| rolf | 0:34f4a53d4ca3 | 80 | b->alloc = alloc; |
| rolf | 0:34f4a53d4ca3 | 81 | return b; |
| rolf | 0:34f4a53d4ca3 | 82 | } |
| rolf | 0:34f4a53d4ca3 | 83 | |
| rolf | 0:34f4a53d4ca3 | 84 | void yajl_buf_free(yajl_buf buf) |
| rolf | 0:34f4a53d4ca3 | 85 | { |
| rolf | 0:34f4a53d4ca3 | 86 | assert(buf != NULL); |
| rolf | 0:34f4a53d4ca3 | 87 | if (buf->data) YA_FREE(buf->alloc, buf->data); |
| rolf | 0:34f4a53d4ca3 | 88 | YA_FREE(buf->alloc, buf); |
| rolf | 0:34f4a53d4ca3 | 89 | } |
| rolf | 0:34f4a53d4ca3 | 90 | |
| rolf | 0:34f4a53d4ca3 | 91 | void yajl_buf_append(yajl_buf buf, const void * data, unsigned int len) |
| rolf | 0:34f4a53d4ca3 | 92 | { |
| rolf | 0:34f4a53d4ca3 | 93 | yajl_buf_ensure_available(buf, len); |
| rolf | 0:34f4a53d4ca3 | 94 | if (len > 0) { |
| rolf | 0:34f4a53d4ca3 | 95 | assert(data != NULL); |
| rolf | 0:34f4a53d4ca3 | 96 | memcpy(buf->data + buf->used, data, len); |
| rolf | 0:34f4a53d4ca3 | 97 | buf->used += len; |
| rolf | 0:34f4a53d4ca3 | 98 | buf->data[buf->used] = 0; |
| rolf | 0:34f4a53d4ca3 | 99 | } |
| rolf | 0:34f4a53d4ca3 | 100 | } |
| rolf | 0:34f4a53d4ca3 | 101 | |
| rolf | 0:34f4a53d4ca3 | 102 | void yajl_buf_clear(yajl_buf buf) |
| rolf | 0:34f4a53d4ca3 | 103 | { |
| rolf | 0:34f4a53d4ca3 | 104 | buf->used = 0; |
| rolf | 0:34f4a53d4ca3 | 105 | if (buf->data) buf->data[buf->used] = 0; |
| rolf | 0:34f4a53d4ca3 | 106 | } |
| rolf | 0:34f4a53d4ca3 | 107 | |
| rolf | 0:34f4a53d4ca3 | 108 | const unsigned char * yajl_buf_data(yajl_buf buf) |
| rolf | 0:34f4a53d4ca3 | 109 | { |
| rolf | 0:34f4a53d4ca3 | 110 | return buf->data; |
| rolf | 0:34f4a53d4ca3 | 111 | } |
| rolf | 0:34f4a53d4ca3 | 112 | |
| rolf | 0:34f4a53d4ca3 | 113 | unsigned int yajl_buf_len(yajl_buf buf) |
| rolf | 0:34f4a53d4ca3 | 114 | { |
| rolf | 0:34f4a53d4ca3 | 115 | return buf->used; |
| rolf | 0:34f4a53d4ca3 | 116 | } |
| rolf | 0:34f4a53d4ca3 | 117 | |
| rolf | 0:34f4a53d4ca3 | 118 | void |
| rolf | 0:34f4a53d4ca3 | 119 | yajl_buf_truncate(yajl_buf buf, unsigned int len) |
| rolf | 0:34f4a53d4ca3 | 120 | { |
| rolf | 0:34f4a53d4ca3 | 121 | assert(len <= buf->used); |
| rolf | 0:34f4a53d4ca3 | 122 | buf->used = len; |
| rolf | 0:34f4a53d4ca3 | 123 | } |
| rolf | 0:34f4a53d4ca3 | 124 | |
| rolf | 0:34f4a53d4ca3 | 125 | #ifdef __cplusplus |
| rolf | 0:34f4a53d4ca3 | 126 | } |
| rolf | 0:34f4a53d4ca3 | 127 | #endif |