CompressUtils.h

#pragma once
 
#include <cstddef>
#include <filesystem>
#include <functional>
#include <memory>
#include <string>
#include <string_view>
 
#include "ll/api/Expected.h"
#include "ll/api/base/Macro.h"
 
namespace ll::inline utils::compress_utils {

enum class CompressFormat : int {
    Gzip,
    Zlib,
};

enum class CompressLevel : int {
    Store,   
    Fastest, 
    Default, 
    Best,    
};

LLNDAPI std::string_view extensionOf(CompressFormat format);

using SinkFn = std::function<Expected<>(std::string_view)>;

class Compressor {
    struct Impl;
    std::unique_ptr<Impl> impl;
 
public:
    LLAPI
    Compressor(SinkFn sink, CompressFormat format = CompressFormat::Gzip, CompressLevel level = CompressLevel::Default);
 
    LLAPI ~Compressor();
 
    LLAPI             Compressor(Compressor&&) noexcept;
    LLAPI Compressor& operator=(Compressor&&) noexcept;

    LLNDAPI Expected<> status() const;
 
    LLAPI Expected<> write(std::string_view data);

    LLAPI Expected<> finish();
};

class Decompressor {
    struct Impl;
    std::unique_ptr<Impl> impl;
 
public:
    LLAPI Decompressor(SinkFn sink, CompressFormat format = CompressFormat::Gzip);
 
    LLAPI ~Decompressor();
 
    LLAPI               Decompressor(Decompressor&&) noexcept;
    LLAPI Decompressor& operator=(Decompressor&&) noexcept;
 
    LLNDAPI Expected<> status() const;
 
    LLAPI Expected<> write(std::string_view data);

    LLAPI Expected<> finish();
};

LLNDAPI Expected<std::string> compress(
    std::string_view data,
    CompressFormat   format = CompressFormat::Gzip,
    CompressLevel    level  = CompressLevel::Default
);

LLNDAPI Expected<std::string>
        decompress(std::string_view data, CompressFormat format = CompressFormat::Gzip, size_t maxSize = 0);

LLNDAPI Expected<> compressFile(
    std::filesystem::path const& src,
    std::filesystem::path const& dst,
    CompressFormat               format = CompressFormat::Gzip,
    CompressLevel                level  = CompressLevel::Default
);

LLNDAPI Expected<> decompressFile(
    std::filesystem::path const& src,
    std::filesystem::path const& dst,
    CompressFormat               format = CompressFormat::Gzip
);
 
} // namespace ll::inline utils::compress_utils