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108 lines
3.7 KiB
C++
108 lines
3.7 KiB
C++
/******************************************************************************
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* $Id: gdalwmscache.cpp 27554 2014-08-02 17:46:37Z rouault $
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*
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* Project: WMS Client Driver
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* Purpose: Implementation of Dataset and RasterBand classes for WMS
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* and other similar services.
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* Author: Adam Nowacki, nowak@xpam.de
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*
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******************************************************************************
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* Copyright (c) 2007, Adam Nowacki
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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****************************************************************************/
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#include "wmsdriver.h"
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GDALWMSCache::GDALWMSCache() {
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m_cache_path = "./gdalwmscache";
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m_postfix = "";
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m_cache_depth = 2;
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}
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GDALWMSCache::~GDALWMSCache() {
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}
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CPLErr GDALWMSCache::Initialize(CPLXMLNode *config) {
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const char *xmlcache_path = CPLGetXMLValue(config, "Path", NULL);
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const char *usercache_path = CPLGetConfigOption("GDAL_DEFAULT_WMS_CACHE_PATH", NULL);
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if(xmlcache_path)
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{
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m_cache_path = xmlcache_path;
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}
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else
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{
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if(usercache_path)
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{
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m_cache_path = usercache_path;
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}
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else
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{
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m_cache_path = "./gdalwmscache";
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}
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}
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const char *cache_depth = CPLGetXMLValue(config, "Depth", "2");
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m_cache_depth = atoi(cache_depth);
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const char *cache_extension = CPLGetXMLValue(config, "Extension", "");
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m_postfix = cache_extension;
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return CE_None;
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}
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CPLErr GDALWMSCache::Write(const char *key, const CPLString &file_name) {
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CPLString cache_file(KeyToCacheFile(key));
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// printf("GDALWMSCache::Write(%s, %s) -> %s\n", key, file_name.c_str());
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if (CPLCopyFile(cache_file.c_str(), file_name.c_str()) != CE_None) {
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MakeDirs(cache_file.c_str());
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CPLCopyFile(cache_file.c_str(), file_name.c_str());
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}
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return CE_None;
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}
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CPLErr GDALWMSCache::Read(const char *key, CPLString *file_name) {
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CPLErr ret = CE_Failure;
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CPLString cache_file(KeyToCacheFile(key));
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VSILFILE* fp = VSIFOpenL(cache_file.c_str(), "rb");
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if (fp != NULL)
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{
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VSIFCloseL(fp);
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*file_name = cache_file;
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ret = CE_None;
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}
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// printf("GDALWMSCache::Read(...) -> %s\n", cache_file.c_str());
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return ret;
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}
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CPLString GDALWMSCache::KeyToCacheFile(const char *key) {
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CPLString hash(MD5String(key));
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CPLString cache_file(m_cache_path);
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if (cache_file.size() && (cache_file[cache_file.size() - 1] != '/')) cache_file.append(1, '/');
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for (int i = 0; i < m_cache_depth; ++i) {
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cache_file.append(1, hash[i]);
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cache_file.append(1, '/');
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}
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cache_file.append(hash);
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cache_file.append(m_postfix);
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return cache_file;
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}
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