Initial import from SVN

database/Checksum.cpp

@@ -0,0 +1,44 @@
+#include <fstream>
+#include <stdexcept>
+
+#include <boost/crc.hpp>  // for boost::crc_32_type
+
+#include "Checksum.hpp"
+
+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
+	{
+		std::cerr << "Failed to open file '" << p << "'" << std::endl;
+		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]);
+	}
+
+}
+