130 lines
3.2 KiB
C++
130 lines
3.2 KiB
C++
/***
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Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: BZip2Decompressor.hpp
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Date: 2022-2-15
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Author: Reece
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***/
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#pragma once
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#include "bzlib.h"
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typedef struct
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{
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void * handle;
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char buf[BZ_MAX_UNUSED];
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AuInt32 bufN;
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char writing;
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bz_stream strm;
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AuInt32 lastErr;
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char initialisedOk;
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} bz2_file;
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static const char *BShitToString(int error)
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{
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int n {};
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bz2_file B;
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B.lastErr = error;
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return BZ2_bzerror((BZFILE *)&B, &n);
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}
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namespace Aurora::Compression
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{
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struct BZIPInflate : BaseStream
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{
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DecompressInfo meta;
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BZIPInflate(const DecompressInfo &meta) : meta(meta), BaseStream(meta.uInternalStreamSize)
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{}
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~BZIPInflate()
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{
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if (this->bInit_)
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{
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BZ2_bzDecompressEnd(&this->ctx_);
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}
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}
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bool Init(const AuSPtr<IO::IStreamReader> &pReader) override
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{
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this->pReader_ = pReader;
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if (!this->IsValid())
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{
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SysPushErrorMem();
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return false;
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}
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auto ret = BZ2_bzDecompressInit(&this->ctx_, 0, 0);
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if (ret < BZ_OK)
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{
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SysPushErrorMem("Error: {}", BShitToString(ret));
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return false;
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}
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this->bInit_ = true;
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this->SetArray(this->din_);
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this->SetOutArray(this->dout_);
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return true;
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}
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AuStreamReadWrittenPair_t Ingest_s(AuUInt32 input) override
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{
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AuUInt32 done {}, read {};
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if (!this->pReader_)
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{
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return {};
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}
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while (read < input)
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{
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auto [pMainDOut, uMainDOutLength] = this->GetDOutPair();
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read += IngestForInPointer<char, uInt>(this->pReader_, this->ctx_.next_in, this->ctx_.avail_in, input - read, this);
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if (!this->ctx_.avail_in)
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{
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return {read, done};
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}
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do
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{
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this->ctx_.avail_out = uMainDOutLength;
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this->ctx_.next_out = pMainDOut;
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auto ret = BZ2_bzDecompress(&this->ctx_);
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if (ret < BZ_OK)
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{
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SysPushErrorIO("Error: {}", BShitToString(ret));
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this->pReader_.reset();
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return AuMakePair(read, 0);
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}
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auto have = uMainDOutLength - this->ctx_.avail_out;
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done += have;
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if (!Write2(pMainDOut,
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have))
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{
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SysPushErrorIO("Compression Out of Overhead");
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this->pReader_.reset();
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return AuMakePair(read, 0);
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}
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}
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while (this->ctx_.avail_out == 0);
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}
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return AuMakePair(read, done);
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}
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private:
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AuSPtr<IO::IStreamReader> pReader_;
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bz_stream ctx_ {};
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bool bInit_ {};
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char dout_[kChunkSize];
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char din_[kChunkSize];
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};
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} |