AuroraRuntime/Source/IO/AuIOBufferedProcessor.cpp

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/***
Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.
File: AuIOBufferedProcessor.cpp
Date: 2022-6-6
Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include <Aurora/IO/IOExperimental.hpp>
#include "AuIOBufferedProcessor.hpp"
namespace Aurora::IO
{
struct IOBufferedProcessor : IIOBufferedProcessor
{
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AuSPtr<IStreamReader> pSource;
AuSPtr<IStreamWriter> pDrain;
AuSPtr<IIOPipeInterceptor> pProcessor;
AuUInt32 uBufferSize {};
AuByteBuffer buffer;
AU_DEFINE_FOR_VA(IOBufferedProcessor,
(AU_DEFINE_CTOR_VA, // initializer-list-like ctor (extending a struct or adding a ctor will break initializer lists)
AU_DEFINE_THIS_MOVE_CTOR_VA, // add move `Object(Object &&)`
AU_DEFINE_EQUALS_VA, // add equals operator
AU_DEFINE_MOVE_VA, // add move assignment operator
AU_DEFINE_COPY_VA), // add copy assignment operator
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(pSource, pDrain, pProcessor, uBufferSize));
AuUInt32 TryProcessBuffered() override;
AuUInt32 GetRawBytesBuffered() override;
AuUInt32 GetRawBytesLimit() override;
AuUInt32 TryPump();
};
AuUInt32 IOBufferedProcessor::TryProcessBuffered()
{
if (this->buffer.IsEmpty())
{
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this->buffer.Allocate(this->uBufferSize);
this->buffer.flagCircular = true; // !!!
}
if (this->buffer.IsEmpty())
{
return TryPump();
}
AuUInt canBuffer = this->buffer.RemainingWrite();
canBuffer = AuMin(canBuffer, AuUInt((this->buffer.length + this->buffer.base) - this->buffer.writePtr));
AuUInt read {};
try
{
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if (this->pSource->Read(AuMemoryViewStreamWrite(AuMemoryViewWrite(this->buffer.writePtr, canBuffer), read)) !=
AuIO::EStreamError::eErrorNone)
{
return TryPump();
}
}
catch (...)
{
SysPushErrorCatch();
}
this->buffer.writePtr += read;
if (this->buffer.writePtr == this->buffer.base + this->buffer.length)
{
this->buffer.writePtr = this->buffer.base;
}
return TryPump();
}
AuUInt32 IOBufferedProcessor::TryPump()
{
AuUInt bytesProcessedTotal {};
AuUInt bytesProcessed {};
do
{
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if (this->buffer.flagCircular && this->buffer.readPtr == this->buffer.base + this->buffer.length)
{
this->buffer.readPtr = this->buffer.base;
}
AuUInt canRead = this->buffer.RemainingBytes();
canRead = AuMin<AuUInt>(canRead, (this->buffer.length + this->buffer.base) - this->buffer.readPtr);
try
{
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if (!this->pProcessor->OnDataAvailable(AuMemoryViewStreamRead(AuMemoryViewRead(this->buffer.readPtr, canRead), bytesProcessed), this->pDrain))
{
break;
}
}
catch (...)
{
SysPushErrorCatch();
}
this->buffer.readPtr += bytesProcessed;
bytesProcessedTotal += bytesProcessed;
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if (this->buffer.flagCircular && this->buffer.readPtr == this->buffer.base + this->buffer.length)
{
this->buffer.readPtr = this->buffer.base;
}
}
while (AuExchange(bytesProcessed, 0));
return bytesProcessedTotal;
}
AuUInt32 IOBufferedProcessor::GetRawBytesBuffered()
{
return this->buffer.RemainingBytes();
}
AuUInt32 IOBufferedProcessor::GetRawBytesLimit()
{
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return this->uBufferSize;
}
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AUKN_SYM AuSPtr<IIOBufferedProcessor> NewBufferedProcessor(const AuSPtr<IStreamReader> &pSource,
const AuSPtr<IIOPipeInterceptor> &pProcessor,
const AuSPtr<IStreamWriter> &pDrain,
AuUInt32 uBufferSize)
{
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return AuMakeShared<IOBufferedProcessor>(pSource, pDrain, pProcessor, uBufferSize);
}
}