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Diffstat (limited to 'comphelper/source/streaming/seqstream.cxx')
| -rw-r--r-- | comphelper/source/streaming/seqstream.cxx | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/comphelper/source/streaming/seqstream.cxx b/comphelper/source/streaming/seqstream.cxx new file mode 100644 index 000000000000..d2852b70a901 --- /dev/null +++ b/comphelper/source/streaming/seqstream.cxx @@ -0,0 +1,246 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +// MARKER(update_precomp.py): autogen include statement, do not remove +#include "precompiled_comphelper.hxx" +#include <comphelper/seqstream.hxx> + +#include <memory.h> // for memcpy + +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(const ByteSequence& 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(::rtl::OUString(), *this); + + return m_aData.getLength() - m_nPos; +} + +// com::sun::star::io::XInputStream +//------------------------------------------------------------------ +sal_Int32 SAL_CALL SequenceInputStream::readBytes( Sequence<sal_Int8>& aData, sal_Int32 nBytesToRead ) + throw(NotConnectedException, BufferSizeExceededException, + IOException, RuntimeException) +{ + ::osl::MutexGuard aGuard( m_aMutex ); + + sal_Int32 nAvail = avail(); + + if (nBytesToRead < 0) + throw BufferSizeExceededException(::rtl::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) +{ + // all data is available at once + return readBytes(aData, nMaxBytesToRead); +} + +//------------------------------------------------------------------ +void SAL_CALL SequenceInputStream::skipBytes( sal_Int32 nBytesToSkip ) + throw(NotConnectedException, BufferSizeExceededException, + IOException, RuntimeException) +{ + ::osl::MutexGuard aGuard( m_aMutex ); + + sal_Int32 nAvail = avail(); + + if (nBytesToSkip < 0) + throw BufferSizeExceededException(::rtl::OUString(),*this); + + if (nAvail < nBytesToSkip) + nBytesToSkip = nAvail; + + m_nPos += nBytesToSkip; +} + +//------------------------------------------------------------------ +sal_Int32 SAL_CALL SequenceInputStream::available( ) + throw(NotConnectedException, IOException, RuntimeException) +{ + ::osl::MutexGuard aGuard( m_aMutex ); + + return avail(); +} + +//------------------------------------------------------------------ +void SAL_CALL SequenceInputStream::closeInput( ) + throw(NotConnectedException, IOException, RuntimeException) +{ + if (m_nPos == -1) + throw NotConnectedException(::rtl::OUString(), *this); + + m_nPos = -1; +} + +void SAL_CALL SequenceInputStream::seek( sal_Int64 location ) throw (IllegalArgumentException, IOException, RuntimeException) +{ + 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) +{ + return m_nPos; +} + +sal_Int64 SAL_CALL SequenceInputStream::getLength( ) throw (IOException, RuntimeException) +{ + 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(sal_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) +{ + MutexGuard aGuard(m_aMutex); + if (!m_bConnected) + throw NotConnectedException(); + + // ensure the sequence has enoungh 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) +{ + 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) +{ + 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 = sal_False; +} + +} // namespace comphelper + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |