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/******************************************************************************
* $Id$
*
* Project: MapServer
* Purpose: MapCache tile caching support file: automatic expanding buffer
* Author: Thomas Bonfort and the MapServer team.
*
******************************************************************************
* Copyright (c) 1996-2011 Regents of the University of Minnesota.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies of this Software or works derived from this Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include "mapcache.h"
#include <stdlib.h>
#define INITIAL_BUFFER_SIZE 100
static void _mapcache_buffer_realloc(mapcache_buffer *buffer, apr_off_t len)
{
if(buffer->avail) {
unsigned char* newbuf ;
while ( len > buffer->avail ) {
buffer->avail += buffer->avail;
}
newbuf = realloc(buffer->buf, buffer->avail) ;
if ( newbuf != buffer->buf ) {
if ( buffer->buf )
apr_pool_cleanup_kill(buffer->pool, buffer->buf, (void*)free) ;
apr_pool_cleanup_register(buffer->pool, newbuf,(void*)free, apr_pool_cleanup_null);
buffer->buf = newbuf ;
}
} else {
buffer->avail = len;
buffer->buf = malloc(buffer->avail);
apr_pool_cleanup_register(buffer->pool, buffer->buf,(void*)free, apr_pool_cleanup_null);
}
}
mapcache_buffer *mapcache_buffer_create(size_t initialStorage, apr_pool_t* pool)
{
mapcache_buffer *buffer = apr_pcalloc(pool, sizeof(mapcache_buffer));
if(!buffer) return NULL;
buffer->pool = pool;
if(initialStorage <=0) initialStorage = 1;
buffer->avail = initialStorage;
if(buffer->avail) {
buffer->buf = malloc(buffer->avail);
apr_pool_cleanup_register(buffer->pool, buffer->buf,(void*)free, apr_pool_cleanup_null);
} else {
buffer->buf = NULL;
}
return buffer;
}
int mapcache_buffer_append(mapcache_buffer *buffer, size_t len, void *data)
{
size_t total = buffer->size + len;
if(total > buffer->avail)
_mapcache_buffer_realloc(buffer,total);
memcpy(((unsigned char*)buffer->buf) + buffer->size, data, len);
buffer->size += len;
return len;
}
/* vim: ts=2 sts=2 et sw=2
*/
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