245 lines
8.9 KiB
C++
245 lines
8.9 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#include <comphelper/seqstream.hxx>
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#include <memory.h> // for memcpy
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namespace comphelper
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{
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using namespace ::com::sun::star::lang;
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using namespace ::com::sun::star::io;
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using namespace ::com::sun::star::uno;
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using namespace ::osl;
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//---------------------------------------------------------------------------------------------
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// class SequenceInputStream
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//---------------------------------------------------------------------------------------------
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//------------------------------------------------------------------
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SequenceInputStream::SequenceInputStream(const ByteSequence& rData)
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: m_aData(rData)
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, m_nPos(0)
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{
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}
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// checks if closed, returns available size, not mutex-protected
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//------------------------------------------------------------------
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inline sal_Int32 SequenceInputStream::avail()
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{
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if (m_nPos == -1)
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throw NotConnectedException(::rtl::OUString(), *this);
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return m_aData.getLength() - m_nPos;
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}
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// com::sun::star::io::XInputStream
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//------------------------------------------------------------------
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sal_Int32 SAL_CALL SequenceInputStream::readBytes( Sequence<sal_Int8>& aData, sal_Int32 nBytesToRead )
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throw(NotConnectedException, BufferSizeExceededException,
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IOException, RuntimeException)
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{
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::osl::MutexGuard aGuard( m_aMutex );
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sal_Int32 nAvail = avail();
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if (nBytesToRead < 0)
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throw BufferSizeExceededException(::rtl::OUString(),*this);
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if (nAvail < nBytesToRead)
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nBytesToRead = nAvail;
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aData.realloc(nBytesToRead);
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memcpy(aData.getArray(), m_aData.getConstArray() + m_nPos, nBytesToRead);
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m_nPos += nBytesToRead;
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return nBytesToRead;
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}
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//------------------------------------------------------------------
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sal_Int32 SAL_CALL SequenceInputStream::readSomeBytes( Sequence<sal_Int8>& aData, sal_Int32 nMaxBytesToRead )
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throw(NotConnectedException, BufferSizeExceededException,
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IOException, RuntimeException)
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{
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// all data is available at once
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return readBytes(aData, nMaxBytesToRead);
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}
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//------------------------------------------------------------------
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void SAL_CALL SequenceInputStream::skipBytes( sal_Int32 nBytesToSkip )
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throw(NotConnectedException, BufferSizeExceededException,
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IOException, RuntimeException)
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{
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::osl::MutexGuard aGuard( m_aMutex );
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sal_Int32 nAvail = avail();
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if (nBytesToSkip < 0)
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throw BufferSizeExceededException(::rtl::OUString(),*this);
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if (nAvail < nBytesToSkip)
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nBytesToSkip = nAvail;
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m_nPos += nBytesToSkip;
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}
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//------------------------------------------------------------------
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sal_Int32 SAL_CALL SequenceInputStream::available( )
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throw(NotConnectedException, IOException, RuntimeException)
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{
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::osl::MutexGuard aGuard( m_aMutex );
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return avail();
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}
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//------------------------------------------------------------------
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void SAL_CALL SequenceInputStream::closeInput( )
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throw(NotConnectedException, IOException, RuntimeException)
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{
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if (m_nPos == -1)
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throw NotConnectedException(::rtl::OUString(), *this);
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m_nPos = -1;
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}
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void SAL_CALL SequenceInputStream::seek( sal_Int64 location ) throw (IllegalArgumentException, IOException, RuntimeException)
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{
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if ( location > m_aData.getLength() || location < 0 || location > SAL_MAX_INT32 )
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throw IllegalArgumentException();
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m_nPos = (sal_Int32) location;
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}
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sal_Int64 SAL_CALL SequenceInputStream::getPosition() throw (IOException, RuntimeException)
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{
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return m_nPos;
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}
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sal_Int64 SAL_CALL SequenceInputStream::getLength( ) throw (IOException, RuntimeException)
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{
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return m_aData.getLength();
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}
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//--------------------------------------------------------------------------
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OSequenceOutputStream::OSequenceOutputStream(Sequence< sal_Int8 >& _rSeq, double _nResizeFactor, sal_Int32 _nMinimumResize, sal_Int32 _nMaximumResize)
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:m_rSequence(_rSeq)
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,m_nResizeFactor(_nResizeFactor)
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,m_nMinimumResize(_nMinimumResize)
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,m_nMaximumResize(_nMaximumResize)
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,m_nSize(0) // starting at position 0
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,m_bConnected(sal_True)
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{
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OSL_ENSURE(m_nResizeFactor > 1, "OSequenceOutputStream::OSequenceOutputStream : invalid resize factor !");
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OSL_ENSURE((m_nMaximumResize < 0) || (m_nMaximumResize > m_nMinimumResize),
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"OSequenceOutputStream::OSequenceOutputStream : these limits don't make any sense !");
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if (m_nResizeFactor <= 1)
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m_nResizeFactor = 1.3;
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if ((m_nMaximumResize >= 0) && (m_nMaximumResize <= m_nMinimumResize))
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m_nMaximumResize = m_nMinimumResize * 2;
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// this heuristic is as good as any other ... supply better parameters if you don't like it :)
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}
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//--------------------------------------------------------------------------
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void SAL_CALL OSequenceOutputStream::writeBytes( const Sequence< sal_Int8 >& _rData ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
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{
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MutexGuard aGuard(m_aMutex);
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if (!m_bConnected)
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throw NotConnectedException();
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// ensure the sequence has enoungh space left
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if (m_nSize + _rData.getLength() > m_rSequence.getLength())
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{
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sal_Int32 nCurrentLength = m_rSequence.getLength();
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sal_Int32 nNewLength = static_cast< sal_Int32 >(
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nCurrentLength * m_nResizeFactor);
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if (m_nMinimumResize > nNewLength - nCurrentLength)
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// we have a minimum so it's not too inefficient for small sequences and small write requests
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nNewLength = nCurrentLength + m_nMinimumResize;
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if ((m_nMaximumResize > 0) && (nNewLength - nCurrentLength > m_nMaximumResize))
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// such a large step is not allowed
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nNewLength = nCurrentLength + m_nMaximumResize;
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if (nNewLength < m_nSize + _rData.getLength())
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{ // it's not enough .... the data would not fit
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// let's take the double amount of the length of the data to be written, as the next write
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// request could be as large as this one
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sal_Int32 nNewGrowth = _rData.getLength() * 2;
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if ((m_nMaximumResize > 0) && (nNewGrowth > m_nMaximumResize))
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{ // we came to the limit, again ...
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nNewGrowth = m_nMaximumResize;
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if (nNewGrowth + nCurrentLength < m_nSize + _rData.getLength())
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// but it would not fit if we respect the limit
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nNewGrowth = m_nSize + _rData.getLength() - nCurrentLength;
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}
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nNewLength = nCurrentLength + nNewGrowth;
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}
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// round it off to the next multiple of 4 ...
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nNewLength = (nNewLength + 3) / 4 * 4;
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m_rSequence.realloc(nNewLength);
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}
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OSL_ENSURE(m_rSequence.getLength() >= m_nSize + _rData.getLength(),
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"ooops ... the realloc algorithm seems to be wrong :( !");
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memcpy(m_rSequence.getArray() + m_nSize, _rData.getConstArray(), _rData.getLength());
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m_nSize += _rData.getLength();
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}
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//--------------------------------------------------------------------------
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void SAL_CALL OSequenceOutputStream::flush( ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
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{
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MutexGuard aGuard(m_aMutex);
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if (!m_bConnected)
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throw NotConnectedException();
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// cut the sequence to the real size
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m_rSequence.realloc(m_nSize);
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}
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//--------------------------------------------------------------------------
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void SAL_CALL OSequenceOutputStream::closeOutput( ) throw(NotConnectedException, BufferSizeExceededException, IOException, RuntimeException)
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{
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MutexGuard aGuard(m_aMutex);
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if (!m_bConnected)
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throw NotConnectedException();
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// cut the sequence to the real size
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m_rSequence.realloc(m_nSize);
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// and don't allow any further accesses
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m_bConnected = sal_False;
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}
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} // namespace comphelper
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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