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46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
#include "hash.hpp"
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#include <extern/smhasher/MurmurHash3.h>
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#include <array>
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#include <cstdint>
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#include <istream>
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#include <string>
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namespace Files
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{
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std::array<std::uint64_t, 2> getHash(std::string_view fileName, std::istream& stream)
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{
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std::array<std::uint64_t, 2> hash{ 0, 0 };
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try
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{
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const auto start = stream.tellg();
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const auto exceptions = stream.exceptions();
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stream.exceptions(std::ios_base::badbit);
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while (stream)
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{
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std::array<char, 4096> value;
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stream.read(value.data(), value.size());
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const std::streamsize read = stream.gcount();
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if (read == 0)
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break;
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std::array<std::uint64_t, 2> blockHash{ 0, 0 };
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MurmurHash3_x64_128(value.data(), static_cast<int>(read), hash.data(), blockHash.data());
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hash = blockHash;
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}
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stream.clear();
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stream.exceptions(exceptions);
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stream.seekg(start);
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}
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catch (const std::exception& e)
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{
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std::string message = "Error while reading \"";
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message += fileName;
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message += "\" to get hash: ";
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message += e.what();
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throw std::runtime_error(message);
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}
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return hash;
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}
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}
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