StringCompression.h

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// StringCompression.h
 
// Interfaces to the wrapping functions for compression and decompression
 
#pragma once
 
 
 
 
 
struct libdeflate_compressor;
struct libdeflate_decompressor;
 
 
 
 
 
namespace Compression
{
    struct Result
    {
        using Static = std::array<std::byte, 128 KiB>;
        using Dynamic = std::unique_ptr<std::byte[]>;
 
        static constexpr size_t StaticCapacity = sizeof(Compression::Result::Static) / sizeof(Compression::Result::Static::value_type);
 
        std::string_view GetStringView() const;
 
        ContiguousByteBufferView GetView() const;
 
        std::variant<Static, Dynamic> Storage;
 
        size_t Size;
    };
 
    class Compressor
    {
    public:
 
        Compressor(int CompressionFactor = 6);
        ~Compressor();
 
        Result CompressGZip(ContiguousByteBufferView Input);
        Result CompressZLib(ContiguousByteBufferView Input);
        Result CompressZLib(const void * Input, size_t Size);
 
    private:
 
        template <auto Algorithm>
        Result Compress(const void * Input, size_t Size);
 
        libdeflate_compressor * m_Handle;
    };
 
    class Extractor
    {
    public:
 
        Extractor();
        ~Extractor();
 
        Result ExtractGZip(ContiguousByteBufferView Input);
        Result ExtractZLib(ContiguousByteBufferView Input);
        Result ExtractZLib(ContiguousByteBufferView Input, size_t UncompressedSize);
 
    private:
 
        template <auto Algorithm> Result Extract(ContiguousByteBufferView Input);
        template <auto Algorithm> Result Extract(ContiguousByteBufferView Input, size_t UncompressedSize);
 
        libdeflate_decompressor * m_Handle;
    };
}