72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
#ifndef __JABYENGINE_LZ4_DECOMPRESSOR_HPP__
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#define __JABYENGINE_LZ4_DECOMPRESSOR_HPP__
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#include "../../stddef.h"
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#include "array_range.hpp"
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#include "types.hpp"
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namespace JabyEngine {
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class LZ4Decompressor {
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public:
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struct Result {
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Progress progress;
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size_t bytes_ready;
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static constexpr Result new_error() {
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return {Progress::Error, 0};
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}
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static constexpr Result new_done(size_t bytes_ready) {
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return {Progress::Done, bytes_ready};
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}
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static constexpr Result new_in_progress(size_t bytes_ready) {
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return {Progress::InProgress, bytes_ready};
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}
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};
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private:
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struct State {
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enum struct Step {
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ReadToken,
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ObtainLiteralLength,
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CopyLiterals,
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ObtainMatchOffset,
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ObtainMatchLength,
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CopyMatch,
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};
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Step step = Step::ReadToken;
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size_t literal_length = 0;
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size_t match_length = 0;
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uint16_t match_offset = 0xFFFF;
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State() = default;
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};
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private:
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uint8_t* dst_adr = nullptr;
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State state;
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static bool obtain_any_length(ArrayRange<const uint8_t>& data, uint32_t &dst_length);
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pair<bool, Result> read_token(ArrayRange<const uint8_t>& data);
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pair<bool, Result> obtain_literal_length(ArrayRange<const uint8_t>& data);
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pair<bool, Result> copy_literals(ArrayRange<const uint8_t>& data);
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pair<bool, Result> obtain_match_offset(ArrayRange<const uint8_t>& data);
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pair<bool, Result> obtain_match_length(ArrayRange<const uint8_t>& data);
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pair<bool, Result> copy_match(ArrayRange<const uint8_t>& data);
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public:
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LZ4Decompressor() = default;
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LZ4Decompressor(uint8_t* dst_adr) : LZ4Decompressor() {
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LZ4Decompressor::setup(dst_adr);
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}
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void setup(uint8_t* dst_adr);
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void reset();
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Result process(ArrayRange<const uint8_t> data);
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};
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}
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#endif //!__JABYENGINE_LZ4_DECOMPRESSOR_HPP__
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