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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include "XBufferedThreadedStream.hxx"
using namespace css::uno;
namespace {
class UnzippingThread: public salhelper::Thread
{
XBufferedThreadedStream &mxStream;
public:
explicit UnzippingThread(XBufferedThreadedStream &xStream): Thread("Unzipping"), mxStream(xStream) {}
private:
virtual void execute() override
{
try
{
mxStream.produce();
}
catch (...)
{
mxStream.saveException(std::current_exception());
}
mxStream.setTerminateThread();
}
};
}
XBufferedThreadedStream::XBufferedThreadedStream(
const Reference<XInputStream>& xSrcStream,
sal_Int64 nStreamSize)
: mxSrcStream( xSrcStream )
, mnPos(0)
, mnStreamSize( nStreamSize )
, mnOffset( 0 )
, mxUnzippingThread( new UnzippingThread(*this) )
, mbTerminateThread( false )
{
mxUnzippingThread->launch();
}
XBufferedThreadedStream::~XBufferedThreadedStream()
{
setTerminateThread();
mxUnzippingThread->join();
}
/**
* Reads from UnbufferedStream in a separate thread and stores the buffer blocks
* in maPendingBuffers queue for further use.
*/
void XBufferedThreadedStream::produce()
{
Buffer pProducedBuffer;
sal_Int64 nTotalBytesRead(0);
std::unique_lock<std::mutex> aGuard( maBufferProtector );
do
{
if( !maUsedBuffers.empty() )
{
pProducedBuffer = maUsedBuffers.front();
maUsedBuffers.pop();
}
aGuard.unlock();
nTotalBytesRead += mxSrcStream->readBytes( pProducedBuffer, nBufferSize );
aGuard.lock();
maPendingBuffers.push( pProducedBuffer );
maBufferConsumeResume.notify_one();
if (!mbTerminateThread)
maBufferProduceResume.wait( aGuard, [&]{return canProduce(); } );
} while( !mbTerminateThread && nTotalBytesRead < mnStreamSize );
}
/**
* Fetches next available block from maPendingBuffers for use in Reading thread.
*/
const Buffer& XBufferedThreadedStream::getNextBlock()
{
std::unique_lock<std::mutex> aGuard( maBufferProtector );
const sal_Int32 nBufSize = maInUseBuffer.getLength();
if( nBufSize <= 0 || mnOffset >= nBufSize )
{
if( mnOffset >= nBufSize )
maUsedBuffers.push( maInUseBuffer );
maBufferConsumeResume.wait( aGuard, [&]{return canConsume(); } );
if( maPendingBuffers.empty() )
{
maInUseBuffer = Buffer();
if (maSavedException)
std::rethrow_exception(maSavedException);
}
else
{
maInUseBuffer = maPendingBuffers.front();
maPendingBuffers.pop();
mnOffset = 0;
if( maPendingBuffers.size() <= nBufferLowWater )
maBufferProduceResume.notify_one();
}
}
return maInUseBuffer;
}
void XBufferedThreadedStream::setTerminateThread()
{
std::scoped_lock<std::mutex> aGuard( maBufferProtector );
mbTerminateThread = true;
maBufferProduceResume.notify_one();
maBufferConsumeResume.notify_one();
}
sal_Int32 SAL_CALL XBufferedThreadedStream::readBytes( Sequence< sal_Int8 >& rData, sal_Int32 nBytesToRead )
{
if( !hasBytes() )
return 0;
const sal_Int32 nAvailableSize = static_cast< sal_Int32 > ( std::min< sal_Int64 >( nBytesToRead, remainingSize() ) );
rData.realloc( nAvailableSize );
auto pData = rData.getArray();
sal_Int32 i = 0, nPendingBytes = nAvailableSize;
while( nPendingBytes )
{
const Buffer &pBuffer = getNextBlock();
if( !pBuffer.hasElements() )
{
rData.realloc( nAvailableSize - nPendingBytes );
return nAvailableSize - nPendingBytes;
}
const sal_Int32 limit = std::min<sal_Int32>( nPendingBytes, pBuffer.getLength() - mnOffset );
memcpy( &pData[i], &pBuffer[mnOffset], limit );
nPendingBytes -= limit;
mnOffset += limit;
mnPos += limit;
i += limit;
}
return nAvailableSize;
}
sal_Int32 SAL_CALL XBufferedThreadedStream::readSomeBytes( Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead )
{
return readBytes( aData, nMaxBytesToRead );
}
void SAL_CALL XBufferedThreadedStream::skipBytes( sal_Int32 nBytesToSkip )
{
if( nBytesToSkip )
{
Sequence < sal_Int8 > aSequence( nBytesToSkip );
readBytes( aSequence, nBytesToSkip );
}
}
sal_Int32 SAL_CALL XBufferedThreadedStream::available()
{
if( !hasBytes() )
return 0;
return static_cast< sal_Int32 > ( std::min< sal_Int64 >( SAL_MAX_INT32, remainingSize() ) );
}
void SAL_CALL XBufferedThreadedStream::closeInput()
{
setTerminateThread();
mxUnzippingThread->join();
mxSrcStream->closeInput();
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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