68 lines
1.7 KiB
C++
68 lines
1.7 KiB
C++
/* Copyright (C) Teemu Suutari */
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#include "FRLEDecompressor.hpp"
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#include "InputStream.hpp"
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#include "OutputStream.hpp"
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#include "common/Common.hpp"
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namespace ancient::internal
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{
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bool FRLEDecompressor::detectHeaderXPK(uint32_t hdr) noexcept
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{
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return hdr==FourCC("FRLE");
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}
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std::shared_ptr<XPKDecompressor> FRLEDecompressor::create(uint32_t hdr,uint32_t recursionLevel,const Buffer &packedData,std::shared_ptr<XPKDecompressor::State> &state,bool verify)
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{
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return std::make_shared<FRLEDecompressor>(hdr,recursionLevel,packedData,state,verify);
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}
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FRLEDecompressor::FRLEDecompressor(uint32_t hdr,uint32_t recursionLevel,const Buffer &packedData,std::shared_ptr<XPKDecompressor::State> &state,bool verify) :
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XPKDecompressor(recursionLevel),
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_packedData(packedData)
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{
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if (!detectHeaderXPK(hdr)) throw Decompressor::InvalidFormatError();
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}
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FRLEDecompressor::~FRLEDecompressor()
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{
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// nothing needed
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}
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const std::string &FRLEDecompressor::getSubName() const noexcept
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{
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static std::string name="XPK-FRLE: RLE-compressor";
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return name;
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}
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void FRLEDecompressor::decompressImpl(Buffer &rawData,const Buffer &previousData,bool verify)
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{
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ForwardInputStream inputStream(_packedData,0,_packedData.size());
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ForwardOutputStream outputStream(rawData,0,rawData.size());
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while (!outputStream.eof())
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{
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auto countMod=[](uint32_t count)->uint32_t
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{
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return (32-(count&0x1f))+(count&0x60);
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};
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uint32_t count=uint32_t(inputStream.readByte());
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if (count<128)
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{
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count=countMod(count);
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for (uint32_t i=0;i<count;i++) outputStream.writeByte(inputStream.readByte());
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} else {
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count=countMod(count)+1;
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uint8_t ch=inputStream.readByte();
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for (uint32_t i=0;i<count;i++) outputStream.writeByte(ch);
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}
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}
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}
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}
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