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Diffstat (limited to 'src/filecache.cpp')
-rw-r--r-- | src/filecache.cpp | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/filecache.cpp b/src/filecache.cpp new file mode 100644 index 000000000..28d6bbc80 --- /dev/null +++ b/src/filecache.cpp @@ -0,0 +1,117 @@ +/* +Minetest-c55 +Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com> +Copyright (C) 2012 Jonathan Neuschäfer <j.neuschaefer@gmx.net> + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License along +with this program; if not, write to the Free Software Foundation, Inc., +51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +*/ + +#include "filecache.h" +#include "clientserver.h" +#include "log.h" +#include "filesys.h" +#include "utility.h" +#include "hex.h" + +#include <string> +#include <iostream> + +bool FileCache::loadByPath(const std::string &name, std::ostream &os, + const std::string &path) +{ + std::ifstream fis(path.c_str(), std::ios_base::binary); + + if(!fis.good()){ + infostream<<"FileCache: File not found in cache: " + <<name << " expected it at: "<<path<<std::endl; + return false; + } + + bool bad = false; + for(;;){ + char buf[1024]; + fis.read(buf, 1024); + std::streamsize len = fis.gcount(); + os.write(buf, len); + if(fis.eof()) + break; + if(!fis.good()){ + bad = true; + break; + } + } + if(bad){ + infostream<<"FileCache: Failed to read file from cache: \"" + <<path<<"\""<<std::endl; + } + + return !bad; +} + +bool FileCache::updateByPath(const std::string &name, const std::string &data, + const std::string &path) +{ + std::ofstream file(path.c_str(), std::ios_base::binary | + std::ios_base::trunc); + + if(!file.good()) + { + errorstream<<"FileCache: Can't write to file at " + <<path<<std::endl; + return false; + } + + file.write(data.c_str(), data.length()); + file.close(); + + return !file.fail(); +} + +bool FileCache::loadByName(const std::string &name, std::ostream &os) +{ + std::string path = m_dir + DIR_DELIM + name; + return loadByPath(name, os, path); +} + + +bool FileCache::updateByName(const std::string &name, const std::string &data) +{ + std::string path = m_dir + DIR_DELIM + name; + return updateByPath(name, data, path); +} + +std::string FileCache::getPathFromChecksum(const std::string &name, + const std::string &checksum) +{ + std::string checksum_hex = hex_encode(checksum.c_str(), checksum.length()); + size_t dot = name.find_last_of('.');; + std::string ext = (dot == std::string::npos)? "" : + name.substr(dot, std::string::npos); + return m_dir + DIR_DELIM + checksum_hex + ext; +} + +bool FileCache::loadByChecksum(const std::string &name, std::ostream &os, + const std::string &checksum) +{ + std::string path = getPathFromChecksum(name, checksum); + return loadByPath(name, os, path); +} + +bool FileCache::updateByChecksum(const std::string &name, + const std::string &data, const std::string &checksum) +{ + std::string path = getPathFromChecksum(name, checksum); + return updateByPath(name, data, path); +} |