78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
#pragma once
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#include "../../stddef.hpp"
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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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constexpr operator bool() const {
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return this->progress != Progress::Error;
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}
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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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Disabled,
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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::Disabled;
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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 = 0;
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State() = default;
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void enable() {
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this->step = Step::ReadToken;
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this->literal_length = 0;
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this->match_length = 0;
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this->match_offset = 0xFFFF;
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}
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void disable() {
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this->step = Step::Disabled;
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}
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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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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 disable();
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Result process(ArrayRange<const uint8_t> data, bool is_last);
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};
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} |