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/******************************************************************************
* $Id: cache.cpp 21880 2011-02-27 14:28:26Z rouault $
*
* Project: WMS Client Driver
* Purpose: Implementation of Dataset and RasterBand classes for WMS
* and other similar services.
* Author: Adam Nowacki, nowak@xpam.de
*
******************************************************************************
* Copyright (c) 2007, Adam Nowacki
*
* 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 or substantial portions of the 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 "stdinc.h"
GDALWMSCache::GDALWMSCache() {
m_cache_path = "./gdalwmscache";
m_postfix = "";
m_cache_depth = 2;
}
GDALWMSCache::~GDALWMSCache() {
}
CPLErr GDALWMSCache::Initialize(CPLXMLNode *config) {
const char *cache_path = CPLGetXMLValue(config, "Path", "./gdalwmscache");
m_cache_path = cache_path;
const char *cache_depth = CPLGetXMLValue(config, "Depth", "2");
m_cache_depth = atoi(cache_depth);
const char *cache_extension = CPLGetXMLValue(config, "Extension", "");
m_postfix = cache_extension;
return CE_None;
}
CPLErr GDALWMSCache::Write(const char *key, const CPLString &file_name) {
CPLString cache_file(KeyToCacheFile(key));
// printf("GDALWMSCache::Write(%s, %s) -> %s\n", key, file_name.c_str());
if (CPLCopyFile(cache_file.c_str(), file_name.c_str()) != CE_None) {
MakeDirs(cache_file.c_str());
CPLCopyFile(cache_file.c_str(), file_name.c_str());
}
return CE_None;
}
CPLErr GDALWMSCache::Read(const char *key, CPLString *file_name) {
CPLErr ret = CE_Failure;
CPLString cache_file(KeyToCacheFile(key));
VSILFILE* fp = VSIFOpenL(cache_file.c_str(), "rb");
if (fp != NULL)
{
VSIFCloseL(fp);
*file_name = cache_file;
ret = CE_None;
}
// printf("GDALWMSCache::Read(...) -> %s\n", cache_file.c_str());
return ret;
}
CPLString GDALWMSCache::KeyToCacheFile(const char *key) {
CPLString hash(MD5String(key));
CPLString cache_file(m_cache_path);
if (cache_file.size() && (cache_file[cache_file.size() - 1] != '/')) cache_file.append(1, '/');
for (int i = 0; i < m_cache_depth; ++i) {
cache_file.append(1, hash[i]);
cache_file.append(1, '/');
}
cache_file.append(hash);
cache_file.append(m_postfix);
return cache_file;
}
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