152 lines
3.9 KiB
C++
152 lines
3.9 KiB
C++
|
/***
|
||
|
Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.
|
||
|
|
||
|
File: DeflateCompressor.hpp
|
||
|
Date: 2022-2-15
|
||
|
Author: Reece
|
||
|
***/
|
||
|
#pragma once
|
||
|
|
||
|
#include "zlib.h"
|
||
|
|
||
|
namespace Aurora::Compression
|
||
|
{
|
||
|
struct ZIPDeflate : public BaseStream
|
||
|
{
|
||
|
CompressionInfo meta;
|
||
|
AuInt8 bits_;
|
||
|
|
||
|
ZIPDeflate(const CompressionInfo &meta, AuInt8 bits) : meta(meta), BaseStream(meta.internalStreamSize), bits_(bits)
|
||
|
{}
|
||
|
|
||
|
~ZIPDeflate()
|
||
|
{
|
||
|
if (this->init_)
|
||
|
{
|
||
|
deflateEnd(&this->ctx_);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
bool Init(const AuSPtr<IO::IStreamReader> &reader)
|
||
|
{
|
||
|
this->reader_ = reader;
|
||
|
|
||
|
this->ctx_.next_in = this->din_;
|
||
|
|
||
|
auto ret = deflateInit2(&this->ctx_, meta.compressionLevel, Z_DEFLATED, this->bits_, 8, Z_DEFAULT_STRATEGY);
|
||
|
if (ret < Z_OK)
|
||
|
{
|
||
|
SysPushErrorMem("Error: {}", ret);
|
||
|
return false;
|
||
|
}
|
||
|
this->init_ = true;
|
||
|
|
||
|
if (!this->_outbuffer)
|
||
|
{
|
||
|
SysPushErrorMem();
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
this->SetArray(this->din_);
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
AuStreamReadWrittenPair_t Ingest_s(AuUInt32 input) override
|
||
|
{
|
||
|
AuUInt32 done {}, read {};
|
||
|
|
||
|
while (read < input)
|
||
|
{
|
||
|
read += IngestForInPointer<Bytef, uInt>(this->reader_, this->ctx_.next_in, this->ctx_.avail_in, input - read);
|
||
|
|
||
|
if (!this->ctx_.avail_in)
|
||
|
{
|
||
|
return {read, done};
|
||
|
}
|
||
|
|
||
|
do
|
||
|
{
|
||
|
this->ctx_.avail_out = AuArraySize(this->dout_);
|
||
|
this->ctx_.next_out = this->dout_;
|
||
|
|
||
|
if (!this->ctx_.avail_out)
|
||
|
{
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
auto ret = deflate(&this->ctx_, Z_NO_FLUSH);
|
||
|
if (ret < Z_OK)
|
||
|
{
|
||
|
SysPushErrorIO("Error: {}", zError(ret));
|
||
|
return AuMakePair(read, 0);
|
||
|
}
|
||
|
|
||
|
auto have = AuArraySize(this->dout_) - this->ctx_.avail_out;
|
||
|
done += have;
|
||
|
|
||
|
if (!Write(reinterpret_cast<const AuUInt8 *>(this->dout_),
|
||
|
have))
|
||
|
{
|
||
|
return AuMakePair(read, 0);
|
||
|
}
|
||
|
|
||
|
}
|
||
|
while (this->ctx_.avail_out == 0);
|
||
|
}
|
||
|
|
||
|
return {read, done};
|
||
|
}
|
||
|
|
||
|
bool Flush() override
|
||
|
{
|
||
|
return RunFlush(Z_SYNC_FLUSH);
|
||
|
}
|
||
|
|
||
|
bool Finish() override
|
||
|
{
|
||
|
return RunFlush(Z_FINISH);
|
||
|
}
|
||
|
|
||
|
bool RunFlush(int type)
|
||
|
{
|
||
|
if (!this->ctx_.avail_in)
|
||
|
{
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
while (this->ctx_.avail_in)
|
||
|
{
|
||
|
do
|
||
|
{
|
||
|
this->ctx_.avail_out = AuArraySize(this->dout_);
|
||
|
this->ctx_.next_out = this->dout_;
|
||
|
|
||
|
auto ret = deflate(&this->ctx_, type);
|
||
|
if (ret < Z_OK)
|
||
|
{
|
||
|
SysPushErrorIO("Error: {}", zError(ret));
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
auto have = AuArraySize(this->dout_) - this->ctx_.avail_out;
|
||
|
|
||
|
if (!Write(reinterpret_cast<const AuUInt8 *>(this->dout_),
|
||
|
have))
|
||
|
{
|
||
|
return false;
|
||
|
}
|
||
|
}
|
||
|
while (this->ctx_.avail_out == 0);
|
||
|
}
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
private:
|
||
|
AuSPtr<IO::IStreamReader> reader_;
|
||
|
z_stream ctx_ {};
|
||
|
bool init_ {};
|
||
|
unsigned char din_[kChunkSize];
|
||
|
unsigned char dout_[kChunkSize];
|
||
|
};
|
||
|
}
|