AuroraRuntime/Source/Compression/Compressors/LZMADecompressor.hpp
2023-10-17 09:28:58 +01:00

151 lines
4.0 KiB
C++

/***
Copyright (C) 2023 J Reece Wilson (a/k/a "Reece"). All rights reserved.
File: LZMADecompressor.hpp
Date: 2023-7-2
Author: Reece
***/
#pragma once
#include <lzma.h>
namespace Aurora::Compression
{
struct LZMAInflate : BaseStream
{
DecompressInfo meta;
lzma_stream stream;
LZMAInflate(const DecompressInfo &meta) : meta(meta), BaseStream(meta.uInternalStreamSize)
{
}
~LZMAInflate()
{
if (this->init_)
{
lzma_end(&this->stream);
}
}
bool Init(const AuSPtr<IO::IStreamReader> &pReader) override
{
this->pReader_ = pReader;
if (!this->IsValid())
{
SysPushErrorMem();
return false;
}
lzma_ret ret {};
AuUInt32 uFlags {};
if (meta.bErrorCheck)
{
uFlags = 0;
}
else
{
uFlags = LZMA_IGNORE_CHECK | LZMA_TELL_NO_CHECK;
}
if (meta.uThreads > 1)
{
lzma_mt options {};
options.threads = AuMin(AuHwInfo::GetCPUInfo().uThreads, meta.uThreads);
options.flags = uFlags;
ret = lzma_stream_decoder_mt(&this->stream, &options);
if (ret != LZMA_OK)
{
this->SetLastError(ret);
AuResetMember(this->pReader_);
return false;
}
}
else
{
ret = lzma_stream_decoder(&this->stream, UINT64_MAX, uFlags);
if (ret != LZMA_OK)
{
this->SetLastError(ret);
AuResetMember(this->pReader_);
return false;
}
}
this->init_ = true;
this->SetArray(this->din_);
this->SetOutArray(this->dout_);
return true;
}
AuStreamReadWrittenPair_t Ingest_s(AuUInt32 input) override
{
AuUInt32 done {}, read {};
if (!this->pReader_)
{
return {};
}
while (read < input)
{
z_stream ctx_ {};
read += IngestForInPointer<const uint8_t, size_t>(this->pReader_, this->stream.next_in, this->stream.avail_in, input - read, this);
if (!this->stream.avail_in)
{
return { read, done };
}
do
{
auto [pMainDOut, uMainDOutLength] = this->GetDOutPair();
this->stream.avail_out = uMainDOutLength;
this->stream.next_out = (Bytef *)pMainDOut;
if (!this->stream.avail_out)
{
break;
}
auto ret = lzma_code(&this->stream, LZMA_RUN);
if (ret != LZMA_OK &&
ret != LZMA_STREAM_END)
{
this->SetLastError(ret);
this->pReader_.reset();
return AuMakePair(read, 0);
}
auto have = uMainDOutLength - this->stream.avail_out;
done += have;
if (!Write2(reinterpret_cast<const AuUInt8 *>(pMainDOut),
have))
{
this->pReader_.reset();
SysPushErrorIO("Compression Out of Overhead");
return AuMakePair(read, 0);
}
}
while (this->stream.avail_out == 0);
}
return { read, done };
}
private:
AuSPtr<IO::IStreamReader> pReader_;
bool init_ {};
unsigned char din_[kChunkSize];
unsigned char dout_[kChunkSize];
};
}