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43 lines
1.8 KiB
C++
43 lines
1.8 KiB
C++
#include "compression.hpp"
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#include <lz4.h>
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#include <cstddef>
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#include <cstring>
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#include <stdexcept>
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#include <string>
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#include <vector>
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namespace Misc
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{
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std::vector<std::byte> compress(const std::vector<std::byte>& data)
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{
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const std::size_t originalSize = data.size();
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std::vector<std::byte> result(
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static_cast<std::size_t>(LZ4_compressBound(static_cast<int>(originalSize)) + sizeof(originalSize)));
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const int size = LZ4_compress_default(reinterpret_cast<const char*>(data.data()),
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reinterpret_cast<char*>(result.data()) + sizeof(originalSize), static_cast<int>(data.size()),
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static_cast<int>(result.size() - sizeof(originalSize)));
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if (size == 0)
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throw std::runtime_error("Failed to compress");
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std::memcpy(result.data(), &originalSize, sizeof(originalSize));
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result.resize(static_cast<std::size_t>(size) + sizeof(originalSize));
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return result;
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}
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std::vector<std::byte> decompress(const std::vector<std::byte>& data)
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{
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std::size_t originalSize;
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std::memcpy(&originalSize, data.data(), sizeof(originalSize));
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std::vector<std::byte> result(originalSize);
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const int size = LZ4_decompress_safe(reinterpret_cast<const char*>(data.data()) + sizeof(originalSize),
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reinterpret_cast<char*>(result.data()), static_cast<int>(data.size() - sizeof(originalSize)),
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static_cast<int>(result.size()));
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if (size < 0)
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throw std::runtime_error("Failed to decompress");
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if (originalSize != static_cast<std::size_t>(size))
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throw std::runtime_error("Size of decompressed data (" + std::to_string(size) + ") doesn't match stored ("
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+ std::to_string(originalSize) + ")");
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return result;
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}
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}
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