99 lines
2.3 KiB
C++
99 lines
2.3 KiB
C++
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/* Copyright (C) Teemu Suutari */
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#include "FBR2Decompressor.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 FBR2Decompressor::detectHeaderXPK(uint32_t hdr) noexcept
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{
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return hdr==FourCC("FBR2");
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}
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std::shared_ptr<XPKDecompressor> FBR2Decompressor::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<FBR2Decompressor>(hdr,recursionLevel,packedData,state,verify);
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}
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FBR2Decompressor::FBR2Decompressor(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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FBR2Decompressor::~FBR2Decompressor()
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{
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// nothing needed
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}
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const std::string &FBR2Decompressor::getSubName() const noexcept
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{
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static std::string name="XPK-FBR2: FBR2 CyberYAFA compressor";
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return name;
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}
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void FBR2Decompressor::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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uint8_t mode=inputStream.readByte();
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while (!outputStream.eof())
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{
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bool doCopy=false;
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uint32_t count=0;
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switch (mode)
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{
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case 33:
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count=uint32_t(inputStream.readByte())<<24;
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count|=uint32_t(inputStream.readByte())<<16;
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count|=uint32_t(inputStream.readByte())<<8;
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count|=uint32_t(inputStream.readByte());
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if (count>=0x8000'0000)
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{
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doCopy=true;
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count=0-count;
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}
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break;
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case 67:
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count=uint32_t(inputStream.readByte())<<8;
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count|=uint32_t(inputStream.readByte());
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if (count>=0x8000)
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{
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doCopy=true;
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count=0x10000-count;
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}
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break;
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case 100:
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count=uint32_t(inputStream.readByte());
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if (count>=0x80)
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{
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doCopy=true;
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count=0x100-count;
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}
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break;
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default:
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throw Decompressor::DecompressionError();
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}
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count++;
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if (doCopy) {
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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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uint8_t repeatChar=inputStream.readByte();
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for (uint32_t i=0;i<count;i++) outputStream.writeByte(repeatChar);
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}
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}
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}
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}
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