65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
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/* Copyright (C) Teemu Suutari */
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#include "CBR0Decompressor.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 CBR0Decompressor::detectHeaderXPK(uint32_t hdr) noexcept
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{
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// CBR1 is practical joke: it is the same as CBR0 but with ID changed
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return hdr==FourCC("CBR0") || hdr==FourCC("CBR1");
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}
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std::shared_ptr<XPKDecompressor> CBR0Decompressor::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<CBR0Decompressor>(hdr,recursionLevel,packedData,state,verify);
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}
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CBR0Decompressor::CBR0Decompressor(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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_isCBR0(hdr==FourCC("CBR0"))
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{
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if (!detectHeaderXPK(hdr)) throw Decompressor::InvalidFormatError();
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}
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CBR0Decompressor::~CBR0Decompressor()
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{
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// nothing needed
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}
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const std::string &CBR0Decompressor::getSubName() const noexcept
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{
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static std::string nameCBR0="XPK-CBR0: RLE-compressor";
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static std::string nameCBR1="XPK-CBR1: RLE-compressor";
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return (_isCBR0)?nameCBR0:nameCBR1;
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}
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void CBR0Decompressor::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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// barely different than RLEN, however the count is well defined here.
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while (!outputStream.eof())
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{
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uint32_t count=inputStream.readByte();
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if (count<128)
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{
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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=257-count;
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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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