98 lines
2.4 KiB
C++
98 lines
2.4 KiB
C++
/*
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* Copyright (C) 2016 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* LMS 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "Path.hpp"
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#include <array>
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#include <fstream>
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#include <boost/crc.hpp> // for boost::crc_32_type
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#include <boost/tokenizer.hpp>
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#include "utils/Exception.hpp"
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#include "utils/Logger.hpp"
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boost::filesystem::path searchExecPath(std::string filename)
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{
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std::string path;
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path = ::getenv("PATH");
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if (path.empty())
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throw LmsException("Environment variable PATH not found");
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std::string result;
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using tokenizer = boost::tokenizer<boost::char_separator<char>>;
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boost::char_separator<char> sep(":");
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tokenizer tok(path, sep);
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for (tokenizer::iterator it = tok.begin(); it != tok.end(); ++it)
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{
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boost::filesystem::path p = *it;
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p /= filename;
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if (!::access(p.c_str(), X_OK))
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{
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result = p.string();
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break;
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}
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}
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return result;
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}
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void computeCrc(const boost::filesystem::path& p, std::vector<unsigned char>& crc)
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{
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using crc_type = boost::crc_32_type;
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crc_type result;
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std::ifstream ifs( p.string().c_str(), std::ios_base::binary );
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if (ifs)
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{
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do
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{
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std::array<char,1024> buffer;
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ifs.read( buffer.data(), buffer.size() );
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result.process_bytes( buffer.data(), ifs.gcount() );
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}
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while ( ifs );
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}
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else
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{
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LMS_LOG(DBUPDATER, ERROR) << "Failed to open file '" << p.string() << "'";
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throw LmsException("Failed to open file '" + p.string() + "'" );
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}
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// Copy the result into a vector of unsigned char
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const crc_type::value_type checksum = result.checksum();
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for (std::size_t i = 0; (i+1)*8 <= crc_type::bit_count; i++)
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{
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const unsigned char* data = reinterpret_cast<const unsigned char*>( &checksum );
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crc.push_back(data[i]);
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}
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}
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bool ensureDirectory(boost::filesystem::path dir)
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{
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if (boost::filesystem::exists(dir))
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return boost::filesystem::is_directory(dir);
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else
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return boost::filesystem::create_directory(dir);
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}
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