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// StringCompression.h
// Interfaces to the wrapping functions for compression and decompression
#pragma once
class cByteBuffer;
struct libdeflate_compressor;
struct libdeflate_decompressor;
namespace Compression
{
/** Contains the result of a compression or extraction operation. */
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);
/** Returns a view (of type char) of the internal store. */
std::string_view GetStringView() const;
/** Returns a view (of type std::byte) of the internal store. */
ContiguousByteBufferView GetView() const;
/** A store allocated on either the stack or heap. */
std::variant<Static, Dynamic> Storage;
/** The length of valid data in the store. */
size_t Size;
};
/** Contains routines for data compression. */
class Compressor
{
public:
/** Creates a new compressor instance with a compression factor [0-12]. */
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;
};
/** Contains routines for data extraction. */
class Extractor
{
public:
/** Creates a new extractor instance. */
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;
};
}
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