1 /******************************************************************************
2 * $Id$
3 *
4 * Project: MapServer
5 * Purpose: MapCache tile caching support file: automatic expanding buffer
6 * Author: Thomas Bonfort and the MapServer team.
7 *
8 ******************************************************************************
9 * Copyright (c) 1996-2011 Regents of the University of Minnesota.
10 *
11 * Permission is hereby granted, free of charge, to any person obtaining a
12 * copy of this software and associated documentation files (the "Software"),
13 * to deal in the Software without restriction, including without limitation
14 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15 * and/or sell copies of the Software, and to permit persons to whom the
16 * Software is furnished to do so, subject to the following conditions:
17 *
18 * The above copyright notice and this permission notice shall be included in
19 * all copies of this Software or works derived from this Software.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
22 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
24 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
26 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
27 * DEALINGS IN THE SOFTWARE.
28 *****************************************************************************/
29
30 #include "mapcache.h"
31 #include <stdlib.h>
32 #define INITIAL_BUFFER_SIZE 100
33
_mapcache_buffer_realloc(mapcache_buffer * buffer,apr_off_t len)34 static void _mapcache_buffer_realloc(mapcache_buffer *buffer, apr_off_t len)
35 {
36 if(buffer->avail) {
37 unsigned char* newbuf ;
38 while ( len > buffer->avail ) {
39 buffer->avail += buffer->avail;
40 }
41 newbuf = realloc(buffer->buf, buffer->avail) ;
42 if ( newbuf != buffer->buf ) {
43 if ( buffer->buf )
44 apr_pool_cleanup_kill(buffer->pool, buffer->buf, (void*)free) ;
45 apr_pool_cleanup_register(buffer->pool, newbuf,(void*)free, apr_pool_cleanup_null);
46 buffer->buf = newbuf ;
47 }
48 } else {
49 buffer->avail = len;
50 buffer->buf = malloc(buffer->avail);
51 apr_pool_cleanup_register(buffer->pool, buffer->buf,(void*)free, apr_pool_cleanup_null);
52 }
53 }
54
mapcache_buffer_create(size_t initialStorage,apr_pool_t * pool)55 mapcache_buffer *mapcache_buffer_create(size_t initialStorage, apr_pool_t* pool)
56 {
57 mapcache_buffer *buffer = apr_pcalloc(pool, sizeof(mapcache_buffer));
58 if(!buffer) return NULL;
59 buffer->pool = pool;
60 buffer->avail = initialStorage;
61 if(buffer->avail) {
62 buffer->buf = malloc(buffer->avail);
63 apr_pool_cleanup_register(buffer->pool, buffer->buf,(void*)free, apr_pool_cleanup_null);
64 } else {
65 buffer->buf = NULL;
66 }
67 return buffer;
68 }
69
mapcache_buffer_append(mapcache_buffer * buffer,size_t len,void * data)70 int mapcache_buffer_append(mapcache_buffer *buffer, size_t len, void *data)
71 {
72 size_t total = buffer->size + len;
73 if(total > buffer->avail)
74 _mapcache_buffer_realloc(buffer,total);
75
76 memcpy(((unsigned char*)buffer->buf) + buffer->size, data, len);
77
78 buffer->size += len;
79 return len;
80 }
81 /* vim: ts=2 sts=2 et sw=2
82 */
83