[DB] Experimental debug version of track clustering

src/utils/Path.cpp

@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2016 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS 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 LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <fstream>
+#include <stdexcept>
+
+#include <boost/crc.hpp>  // for boost::crc_32_type
+#include <boost/tokenizer.hpp>
+
+#include "logger/Logger.hpp"
+
+#include "Path.hpp"
+
+boost::filesystem::path searchExecPath(std::string filename)
+{
+	std::string path;
+
+	path = ::getenv("PATH");
+	if (path.empty())
+		throw std::runtime_error("Environment variable PATH not found");
+
+	std::string result;
+	typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
+	boost::char_separator<char> sep(":");
+	tokenizer tok(path, sep);
+	for (tokenizer::iterator it = tok.begin(); it != tok.end(); ++it)
+	{
+		boost::filesystem::path p = *it;
+		p /= filename;
+		if (!::access(p.c_str(), X_OK))
+		{
+			result = p.string();
+			break;
+		}
+	}
+	return result;
+}
+
+typedef boost::crc_32_type crc_type;
+
+void computeCrc(const boost::filesystem::path& p, std::vector<unsigned char>& crc)
+{
+	crc_type	result;
+
+	std::ifstream  ifs( p.string().c_str(), std::ios_base::binary );
+
+	if (ifs)
+	{
+		do
+		{
+			std::array<char,1024>	buffer;
+
+			ifs.read( buffer.data(), buffer.size() );
+			result.process_bytes( buffer.data(), ifs.gcount() );
+		}
+		while ( ifs );
+	}
+	else
+	{
+		LMS_LOG(DBUPDATER, ERROR) << "Failed to open file '" << p << "'";
+		throw std::runtime_error("Failed to open file '" + p.string() + "'" );
+	}
+
+	// Copy back result into the vector
+
+	// Copy the result into a vector of unsigned char
+	const crc_type::value_type checksum = result.checksum();
+	for (std::size_t i = 0; (i+1)*8 <= crc_type::bit_count; i++)
+	{
+		const unsigned char* data = reinterpret_cast<const unsigned char*>( &checksum );
+		crc.push_back(data[i]);
+	}
+}