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Diffstat (limited to 'comphelper/source/streaming/seqstream.cxx')
| -rw-r--r-- | comphelper/source/streaming/seqstream.cxx | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/comphelper/source/streaming/seqstream.cxx b/comphelper/source/streaming/seqstream.cxx new file mode 100644 index 000000000..2837f27f5 --- /dev/null +++ b/comphelper/source/streaming/seqstream.cxx @@ -0,0 +1,220 @@ +/* -*- 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 <sal/config.h> + +#include <com/sun/star/io/BufferSizeExceededException.hpp> +#include <com/sun/star/io/NotConnectedException.hpp> +#include <com/sun/star/lang/IllegalArgumentException.hpp> +#include <comphelper/seqstream.hxx> + +#include <osl/diagnose.h> + +namespace comphelper +{ +using namespace ::com::sun::star::lang; +using namespace ::com::sun::star::io; +using namespace ::com::sun::star::uno; +using namespace ::osl; + + + + +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 ) +{ + ::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 ) +{ + // all data is available at once + return readBytes(aData, nMaxBytesToRead); +} + + +void SAL_CALL SequenceInputStream::skipBytes( sal_Int32 nBytesToSkip ) +{ + ::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( ) +{ + ::osl::MutexGuard aGuard( m_aMutex ); + + return avail(); +} + + +void SAL_CALL SequenceInputStream::closeInput( ) +{ + if (m_nPos == -1) + throw NotConnectedException(OUString(), *this); + + m_nPos = -1; +} + +void SAL_CALL SequenceInputStream::seek( sal_Int64 location ) +{ + if ( location > m_aData.getLength() || location < 0 || location > SAL_MAX_INT32 ) + throw IllegalArgumentException(); + m_nPos = static_cast<sal_Int32>(location); +} + +sal_Int64 SAL_CALL SequenceInputStream::getPosition() +{ + return m_nPos; +} + +sal_Int64 SAL_CALL SequenceInputStream::getLength( ) +{ + return m_aData.getLength(); +} + + +OSequenceOutputStream::OSequenceOutputStream(Sequence< sal_Int8 >& _rSeq, double _nResizeFactor, sal_Int32 _nMinimumResize) + :m_rSequence(_rSeq) + ,m_nResizeFactor(_nResizeFactor) + ,m_nMinimumResize(_nMinimumResize) + ,m_nSize(0) // starting at position 0 + ,m_bConnected(true) +{ + OSL_ENSURE(m_nResizeFactor > 1, "OSequenceOutputStream::OSequenceOutputStream : invalid resize factor !"); + + if (m_nResizeFactor <= 1) + m_nResizeFactor = 1.3; +} + + +void SAL_CALL OSequenceOutputStream::writeBytes( const Sequence< sal_Int8 >& _rData ) +{ + 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 (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; + 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( ) +{ + MutexGuard aGuard(m_aMutex); + if (!m_bConnected) + throw NotConnectedException(); + + // cut the sequence to the real size + m_rSequence.realloc(m_nSize); +} + +void OSequenceOutputStream::finalizeOutput() +{ + MutexGuard aGuard(m_aMutex); + + // cut the sequence to the real size + m_rSequence.realloc(m_nSize); + // and don't allow any further accesses + m_bConnected = false; +} + +void SAL_CALL OSequenceOutputStream::closeOutput() +{ + MutexGuard aGuard(m_aMutex); + if (!m_bConnected) + throw NotConnectedException(); + + finalizeOutput(); +} + +} // namespace comphelper + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |