mirror of https://github.com/minetest/minetest.git
120 lines
3.1 KiB
C++
120 lines
3.1 KiB
C++
/*
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Minetest-c55
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Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com>
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Copyright (C) 2012 Jonathan Neuschäfer <j.neuschaefer@gmx.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "filecache.h"
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#include "clientserver.h"
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#include "log.h"
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#include "filesys.h"
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#include "hex.h"
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#include "sha1.h"
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#include <string>
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#include <iostream>
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#include <fstream>
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#include <sstream>
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bool FileCache::loadByPath(const std::string &path, std::ostream &os)
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{
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std::ifstream fis(path.c_str(), std::ios_base::binary);
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if(!fis.good()){
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verbosestream<<"FileCache: File not found in cache: "
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<<path<<std::endl;
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return false;
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}
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bool bad = false;
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for(;;){
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char buf[1024];
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fis.read(buf, 1024);
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std::streamsize len = fis.gcount();
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os.write(buf, len);
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if(fis.eof())
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break;
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if(!fis.good()){
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bad = true;
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break;
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}
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}
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if(bad){
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errorstream<<"FileCache: Failed to read file from cache: \""
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<<path<<"\""<<std::endl;
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}
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return !bad;
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}
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bool FileCache::updateByPath(const std::string &path, const std::string &data)
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{
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std::ofstream file(path.c_str(), std::ios_base::binary |
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std::ios_base::trunc);
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if(!file.good())
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{
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errorstream<<"FileCache: Can't write to file at "
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<<path<<std::endl;
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return false;
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}
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file.write(data.c_str(), data.length());
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file.close();
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return !file.fail();
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}
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bool FileCache::update(const std::string &name, const std::string &data)
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{
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std::string path = m_dir + DIR_DELIM + name;
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return updateByPath(path, data);
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}
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bool FileCache::update_sha1(const std::string &data)
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{
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SHA1 sha1;
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sha1.addBytes(data.c_str(), data.size());
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unsigned char *digest = sha1.getDigest();
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std::string sha1_raw((char*)digest, 20);
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free(digest);
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std::string sha1_hex = hex_encode(sha1_raw);
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return update(sha1_hex, data);
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}
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bool FileCache::load(const std::string &name, std::ostream &os)
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{
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std::string path = m_dir + DIR_DELIM + name;
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return loadByPath(path, os);
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}
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bool FileCache::load_sha1(const std::string &sha1_raw, std::ostream &os)
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{
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std::ostringstream tmp_os(std::ios_base::binary);
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if(!load(hex_encode(sha1_raw), tmp_os))
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return false;
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SHA1 sha1;
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sha1.addBytes(tmp_os.str().c_str(), tmp_os.str().length());
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unsigned char *digest = sha1.getDigest();
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std::string sha1_real_raw((char*)digest, 20);
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free(digest);
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if(sha1_real_raw != sha1_raw){
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verbosestream<<"FileCache["<<m_dir<<"]: filename "<<sha1_real_raw
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<<" mismatches actual checksum"<<std::endl;
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return false;
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}
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os<<tmp_os.str();
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return true;
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}
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