84 lines
2.0 KiB
C++
84 lines
2.0 KiB
C++
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// StringCompression.h
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// Interfaces to the wrapping functions for compression and decompression
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#pragma once
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struct libdeflate_compressor;
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struct libdeflate_decompressor;
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namespace Compression
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{
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/** Contains the result of a compression or extraction operation. */
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struct Result
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{
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using Static = std::array<std::byte, 128 KiB>;
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using Dynamic = std::unique_ptr<std::byte[]>;
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static constexpr size_t StaticCapacity = sizeof(Compression::Result::Static) / sizeof(Compression::Result::Static::value_type);
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/** Returns a view (of type char) of the internal store. */
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std::string_view GetStringView() const;
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/** Returns a view (of type std::byte) of the internal store. */
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ContiguousByteBufferView GetView() const;
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/** A store allocated on either the stack or heap. */
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std::variant<Static, Dynamic> Storage;
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/** The length of valid data in the store. */
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size_t Size;
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};
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/** Contains routines for data compression. */
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class Compressor
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{
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public:
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/** Creates a new compressor instance with a compression factor [0-12]. */
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Compressor(int CompressionFactor = 6);
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~Compressor();
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Result CompressGZip(ContiguousByteBufferView Input);
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Result CompressZLib(ContiguousByteBufferView Input);
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Result CompressZLib(const void * Input, size_t Size);
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private:
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template <auto Algorithm>
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Result Compress(const void * Input, size_t Size);
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libdeflate_compressor * m_Handle;
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};
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/** Contains routines for data extraction. */
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class Extractor
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{
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public:
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/** Creates a new extractor instance. */
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Extractor();
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~Extractor();
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Result ExtractGZip(ContiguousByteBufferView Input);
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Result ExtractZLib(ContiguousByteBufferView Input);
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Result ExtractZLib(ContiguousByteBufferView Input, size_t UncompressedSize);
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private:
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template <auto Algorithm> Result Extract(ContiguousByteBufferView Input);
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template <auto Algorithm> Result Extract(ContiguousByteBufferView Input, size_t UncompressedSize);
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libdeflate_decompressor * m_Handle;
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};
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}
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