63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
|
/* Copyright (C) Teemu Suutari */
|
||
|
|
|
||
|
|
#include "RLENDecompressor.hpp"
|
||
|
|
#include "InputStream.hpp"
|
||
|
|
#include "OutputStream.hpp"
|
||
|
|
#include "common/Common.hpp"
|
||
|
|
|
||
|
|
|
||
|
|
namespace ancient::internal
|
||
|
|
{
|
||
|
|
|
||
|
|
bool RLENDecompressor::detectHeaderXPK(uint32_t hdr) noexcept
|
||
|
|
{
|
||
|
|
return hdr==FourCC("RLEN");
|
||
|
|
}
|
||
|
|
|
||
|
|
std::shared_ptr<XPKDecompressor> RLENDecompressor::create(uint32_t hdr,uint32_t recursionLevel,const Buffer &packedData,std::shared_ptr<XPKDecompressor::State> &state,bool verify)
|
||
|
|
{
|
||
|
|
return std::make_shared<RLENDecompressor>(hdr,recursionLevel,packedData,state,verify);
|
||
|
|
}
|
||
|
|
|
||
|
|
RLENDecompressor::RLENDecompressor(uint32_t hdr,uint32_t recursionLevel,const Buffer &packedData,std::shared_ptr<XPKDecompressor::State> &state,bool verify) :
|
||
|
|
XPKDecompressor(recursionLevel),
|
||
|
|
_packedData(packedData)
|
||
|
|
{
|
||
|
|
if (!detectHeaderXPK(hdr)) throw Decompressor::InvalidFormatError();
|
||
|
|
}
|
||
|
|
|
||
|
|
RLENDecompressor::~RLENDecompressor()
|
||
|
|
{
|
||
|
|
// nothing needed
|
||
|
|
}
|
||
|
|
|
||
|
|
const std::string &RLENDecompressor::getSubName() const noexcept
|
||
|
|
{
|
||
|
|
static std::string name="XPK-RLEN: RLE-compressor";
|
||
|
|
return name;
|
||
|
|
}
|
||
|
|
|
||
|
|
void RLENDecompressor::decompressImpl(Buffer &rawData,const Buffer &previousData,bool verify)
|
||
|
|
{
|
||
|
|
ForwardInputStream inputStream(_packedData,0,_packedData.size());
|
||
|
|
ForwardOutputStream outputStream(rawData,0,rawData.size());
|
||
|
|
|
||
|
|
while (!outputStream.eof())
|
||
|
|
{
|
||
|
|
uint32_t count=uint32_t(inputStream.readByte());
|
||
|
|
if (count<128)
|
||
|
|
{
|
||
|
|
if (!count) throw Decompressor::DecompressionError(); // lets have this as error...
|
||
|
|
for (uint32_t i=0;i<count;i++) outputStream.writeByte(inputStream.readByte());
|
||
|
|
} else {
|
||
|
|
// I can see from different implementations that count=0x80 is buggy...
|
||
|
|
// lets try to have it more or less correctly here
|
||
|
|
count=256-count;
|
||
|
|
uint8_t ch=inputStream.readByte();
|
||
|
|
for (uint32_t i=0;i<count;i++) outputStream.writeByte(ch);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|