45 lines
988 B
C++
45 lines
988 B
C++
#include <fstream>
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#include <stdexcept>
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#include <boost/crc.hpp> // for boost::crc_32_type
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#include "Checksum.hpp"
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typedef boost::crc_32_type crc_type;
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void computeCrc(const boost::filesystem::path& p, std::vector<unsigned char>& crc)
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{
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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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std::cerr << "Failed to open file '" << p << "'" << std::endl;
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throw std::runtime_error("Failed to open file '" + p.string() + "'" );
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}
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// Copy back result into the vector
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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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