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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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <comphelper/seqstream.hxx>
#include <osl/diagnose.h>
#include <memory.h>
namespace comphelper
{
using namespace ::com::sun::star::lang;
using namespace ::com::sun::star::io;
using namespace ::com::sun::star::uno;
using namespace ::osl;
// class SequenceInputStream
SequenceInputStream::SequenceInputStream(
css::uno::Sequence<sal_Int8> const & rData)
: m_aData(rData)
, m_nPos(0)
{
}
// checks if closed, returns available size, not mutex-protected
inline sal_Int32 SequenceInputStream::avail()
{
if (m_nPos == -1)
throw NotConnectedException(OUString(), *this);
return m_aData.getLength() - m_nPos;
}
// css::io::XInputStream
sal_Int32 SAL_CALL SequenceInputStream::readBytes( Sequence<sal_Int8>& aData, sal_Int32 nBytesToRead )
throw(NotConnectedException, BufferSizeExceededException,
IOException, RuntimeException, std::exception)
{
::osl::MutexGuard aGuard( m_aMutex );
sal_Int32 nAvail = avail();
if (nBytesToRead < 0)
throw BufferSizeExceededException(OUString(),*this);
if (nAvail < nBytesToRead)
nBytesToRead = nAvail;
aData.realloc(nBytesToRead);
memcpy(aData.getArray(), m_aData.getConstArray() + m_nPos, nBytesToRead);
m_nPos += nBytesToRead;
return nBytesToRead;
}
sal_Int32 SAL_CALL SequenceInputStream::readSomeBytes( Sequence<sal_Int8>& aData, sal_Int32 nMaxBytesToRead )
throw(NotConnectedException, BufferSizeExceededException,
IOException, RuntimeException, std::exception)
{
// all data is available at once
return readBytes(aData, nMaxBytesToRead);
}
void SAL_CALL SequenceInputStream::skipBytes( sal_Int32 nBytesToSkip )
throw(NotConnectedException, BufferSizeExceededException,
IOException, RuntimeException, std::exception)
{
::osl::MutexGuard aGuard( m_aMutex );
sal_Int32 nAvail = avail();
if (nBytesToSkip < 0)
throw BufferSizeExceededException(OUString(),*this);
if (nAvail < nBytesToSkip)
nBytesToSkip = nAvail;
m_nPos += nBytesToSkip;
}
sal_Int32 SAL_CALL SequenceInputStream::available( )
throw(NotConnectedException, IOException, RuntimeException, std::exception)
{
::osl::MutexGuard aGuard( m_aMutex );
return avail();
}
void SAL_CALL SequenceInputStream::closeInput( )
throw(NotConnectedException, IOException, RuntimeException, std::exception)
{
if (m_nPos == -1)
throw NotConnectedException(OUString(), *this);
m_nPos = -1;
}
void SAL_CALL SequenceInputStream::seek( sal_Int64 location ) throw (IllegalArgumentException, IOException, RuntimeException, std::exception)
{
if ( location > m_aData.getLength() || location < 0 || location > SAL_MAX_INT32 )
throw IllegalArgumentException();
m_nPos = (sal_Int32) location;
}
sal_Int64 SAL_CALL SequenceInputStream::getPosition() throw (IOException, RuntimeException, std::exception)
{
return m_nPos;
}
sal_Int64 SAL_CALL SequenceInputStream::getLength( ) throw (IOException, RuntimeException, std::exception)
{
return m_aData.getLength();
}
OSequenceOutputStream::OSequenceOutputStream(Sequence< sal_Int8 >& _rSeq, double _nResizeFactor, sal_Int32 _nMinimumResize, sal_Int32 _nMaximumResize)
:m_rSequence(_rSeq)
,m_nResizeFactor(_nResizeFactor)
,m_nMinimumResize(_nMinimumResize)
,m_nMaximumResize(_nMaximumResize)
,m_nSize(0) // starting at position 0
,m_bConnected(true)
{
OSL_ENSURE(m_nResizeFactor > 1, "OSequenceOutputStream::OSequenceOutputStream : invalid resize factor !");
OSL_ENSURE((m_nMaximumResize < 0) || (m_nMaximumResize > m_nMinimumResize),
"OSequenceOutputStream::OSequenceOutputStream : these limits don't make any sense !");
if (m_nResizeFactor <= 1)
m_nResizeFactor = 1.3;
if ((m_nMaximumResize >= 0) && (m_nMaximumResize <= m_nMinimumResize))
m_nMaximumResize = m_nMinimumResize * 2;
// this heuristic is as good as any other ... supply better parameters if you don't like it :)
}
void SAL_CALL OSequenceOutputStream::writeBytes( const Sequence< sal_Int8 >& _rData ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException, std::exception)
{
MutexGuard aGuard(m_aMutex);
if (!m_bConnected)
throw NotConnectedException();
// ensure the sequence has enough space left
if (m_nSize + _rData.getLength() > m_rSequence.getLength())
{
sal_Int32 nCurrentLength = m_rSequence.getLength();
sal_Int32 nNewLength = static_cast< sal_Int32 >(
nCurrentLength * m_nResizeFactor);
if (m_nMinimumResize > nNewLength - nCurrentLength)
// we have a minimum so it's not too inefficient for small sequences and small write requests
nNewLength = nCurrentLength + m_nMinimumResize;
if ((m_nMaximumResize > 0) && (nNewLength - nCurrentLength > m_nMaximumResize))
// such a large step is not allowed
nNewLength = nCurrentLength + m_nMaximumResize;
if (nNewLength < m_nSize + _rData.getLength())
{ // it's not enough .... the data would not fit
// let's take the double amount of the length of the data to be written, as the next write
// request could be as large as this one
sal_Int32 nNewGrowth = _rData.getLength() * 2;
if ((m_nMaximumResize > 0) && (nNewGrowth > m_nMaximumResize))
{ // we came to the limit, again ...
nNewGrowth = m_nMaximumResize;
if (nNewGrowth + nCurrentLength < m_nSize + _rData.getLength())
// but it would not fit if we respect the limit
nNewGrowth = m_nSize + _rData.getLength() - nCurrentLength;
}
nNewLength = nCurrentLength + nNewGrowth;
}
// round it off to the next multiple of 4 ...
nNewLength = (nNewLength + 3) / 4 * 4;
m_rSequence.realloc(nNewLength);
}
OSL_ENSURE(m_rSequence.getLength() >= m_nSize + _rData.getLength(),
"ooops ... the realloc algorithm seems to be wrong :( !");
memcpy(m_rSequence.getArray() + m_nSize, _rData.getConstArray(), _rData.getLength());
m_nSize += _rData.getLength();
}
void SAL_CALL OSequenceOutputStream::flush( ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException, std::exception)
{
MutexGuard aGuard(m_aMutex);
if (!m_bConnected)
throw NotConnectedException();
// cut the sequence to the real size
m_rSequence.realloc(m_nSize);
}
void SAL_CALL OSequenceOutputStream::closeOutput( ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException, std::exception)
{
MutexGuard aGuard(m_aMutex);
if (!m_bConnected)
throw NotConnectedException();
// cut the sequence to the real size
m_rSequence.realloc(m_nSize);
// and don't allow any further accesses
m_bConnected = false;
}
} // namespace comphelper
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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