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Broken LZ4 algorithm! The decompression seems to work now (needs improvement?) but the conversion tools emit 64K block sizes which is unhelpfull for us

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jaby
2022-12-29 23:18:37 +01:00
parent 3554394e11
commit 3d56532a3b
7 changed files with 250 additions and 15 deletions
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30
include/PSX/Auxiliary/lz4_decompressor.hpp
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@@ -1,6 +1,7 @@
#ifndef __JABYENGINE_LZ4_DECOMPRESSOR_HPP__
#define __JABYENGINE_LZ4_DECOMPRESSOR_HPP__
#include "../../stddef.h"
#include "array_range.hpp"
#include "types.hpp"
namespace JabyEngine {
@@ -24,12 +25,37 @@ namespace JabyEngine {
};
private:
struct State {};
struct State {
enum struct Step {
ReadToken,
ObtainLiteralLength,
CopyLiterals,
ObtainMatchOffset,
ObtainMatchLength,
CopyMatch,
};
Step step = Step::ReadToken;
size_t literal_length = 0;
size_t match_length = 0;
uint16_t match_offset = 0xFFFF;
State() = default;
};
private:
uint8_t* dst_adr = nullptr;
State state;
static bool obtain_any_length(ArrayRange<const uint8_t>& data, uint32_t &dst_length);
pair<bool, Result> read_token(ArrayRange<const uint8_t>& data);
pair<bool, Result> obtain_literal_length(ArrayRange<const uint8_t>& data);
pair<bool, Result> copy_literals(ArrayRange<const uint8_t>& data);
pair<bool, Result> obtain_match_offset(ArrayRange<const uint8_t>& data);
pair<bool, Result> obtain_match_length(ArrayRange<const uint8_t>& data);
pair<bool, Result> copy_match(ArrayRange<const uint8_t>& data);
public:
LZ4Decompressor() = default;
LZ4Decompressor(uint8_t* dst_adr) : LZ4Decompressor() {
@@ -39,7 +65,7 @@ namespace JabyEngine {
void setup(uint8_t* dst_adr);
void reset();
Result process(const uint8_t* data, size_t size);
Result process(ArrayRange<const uint8_t> data);
};
}