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/*
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.
*/
#ifndef FILECACHE_HEADER
#define FILECACHE_HEADER
#include <string>
#include <iostream>
class FileCache
{
public:
/*
'dir' is the file cache directory to use.
*/
FileCache(std::string dir):
m_dir(dir)
{
}
/*
Searches the cache for a file with a given name.
If the file is found, lookup copies it into 'os' and
returns true. Otherwise false is returned.
*/
bool loadByName(const std::string &name, std::ostream &os);
/*
Stores a file in the cache based on its name.
Returns true on success, false otherwise.
*/
bool updateByName(const std::string &name, const std::string &data);
/*
Loads a file based on a check sum, which may be any kind of
rather unique byte sequence. Returns true, if the file could
be written into os, false otherwise.
A file name is required to give the disk file a name that
has the right file name extension (e.g. ".png").
*/
bool loadByChecksum(const std::string &name, std::ostream &os,
const std::string &checksum);
/*
Stores a file in the cache based on its checksum.
Returns true on success, false otherwise.
*/
bool updateByChecksum(const std::string &name, const std::string &data,
const std::string &checksum);
private:
std::string m_dir;
bool loadByPath(const std::string &name, std::ostream &os,
const std::string &path);
bool updateByPath(const std::string &name, const std::string &data,
const std::string &path);
std::string getPathFromChecksum(const std::string &name,
const std::string &checksum);
};
#endif
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