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+/*************************************************************************
+ *
+ * $RCSfile: streamhelper.cxx,v $
+ *
+ * $Revision: 1.1.1.1 $
+ *
+ * last change: $Author: hr $ $Date: 2000-09-18 17:24:18 $
+ *
+ * The Contents of this file are made available subject to the terms of
+ * either of the following licenses
+ *
+ * - GNU Lesser General Public License Version 2.1
+ * - Sun Industry Standards Source License Version 1.1
+ *
+ * Sun Microsystems Inc., October, 2000
+ *
+ * GNU Lesser General Public License Version 2.1
+ * =============================================
+ * Copyright 2000 by Sun Microsystems, Inc.
+ * 901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software Foundation.
+ *
+ * This library 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 for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ *
+ * Sun Industry Standards Source License Version 1.1
+ * =================================================
+ * The contents of this file are subject to the Sun Industry Standards
+ * Source License Version 1.1 (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.openoffice.org/license.html.
+ *
+ * Software provided under this License is provided on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+ * WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
+ * MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
+ * See the License for the specific provisions governing your rights and
+ * obligations concerning the Software.
+ *
+ * The Initial Developer of the Original Code is: Sun Microsystems, Inc.
+ *
+ * Copyright: 2000 by Sun Microsystems, Inc.
+ *
+ * All Rights Reserved.
+ *
+ * Contributor(s): _______________________________________
+ *
+ *
+ ************************************************************************/
+#include <rtl/alloc.h>
+
+#include <assert.h>
+#include <string.h>
+
+#include <com/sun/star/uno/Sequence.hxx>
+
+#include <com/sun/star/uno/Exception.hpp>
+
+using namespace ::com::sun::star::uno;
+
+#include "streamhelper.hxx"
+
+namespace io_stm {
+
+void MemFIFO::write( const Sequence< sal_Int8 > &seq )
+ throw ( IFIFO_OutOfMemoryException,
+ IFIFO_OutOfBoundsException )
+{
+ try
+ {
+ writeAt(getSize(), seq );
+ }
+ catch( IRingBuffer_OutOfMemoryException & )
+ {
+ throw IFIFO_OutOfMemoryException();
+ }
+ catch( IRingBuffer_OutOfBoundsException & )
+ {
+ throw IFIFO_OutOfBoundsException();
+ }
+}
+
+void MemFIFO::read( Sequence<sal_Int8> &seq , sal_Int32 nBufferLen ) throw (IFIFO_OutOfBoundsException)
+{
+ try
+ {
+ readAt(0, seq , nBufferLen);
+ forgetFromStart( nBufferLen );
+ }
+ catch ( IRingBuffer_OutOfBoundsException & )
+ {
+ throw IFIFO_OutOfBoundsException();
+ }
+}
+
+void MemFIFO::skip( sal_Int32 nBytesToSkip ) throw ( IFIFO_OutOfBoundsException )
+{
+ try
+ {
+ forgetFromStart( nBytesToSkip );
+ }
+ catch( IRingBuffer_OutOfBoundsException & )
+ {
+ throw IFIFO_OutOfBoundsException();
+ }
+}
+
+
+
+MemRingBuffer::MemRingBuffer()
+{
+ m_nBufferLen = 0;
+ m_p = 0;
+ m_nStart = 0;
+ m_nOccupiedBuffer = 0;
+}
+
+MemRingBuffer::~MemRingBuffer()
+{
+ if( m_p ) {
+ rtl_freeMemory( m_p );
+ }
+}
+
+void MemRingBuffer::resizeBuffer( sal_Int32 nMinSize ) throw( IRingBuffer_OutOfMemoryException)
+{
+ sal_Int32 nNewLen = 1;
+
+ while( nMinSize > nNewLen ) {
+ nNewLen = nNewLen << 1;
+ }
+
+ // buffer never shrinks !
+ if( nNewLen < m_nBufferLen ) {
+ nNewLen = m_nBufferLen;
+ }
+
+ if( nNewLen != m_nBufferLen ) {
+ m_p = ( sal_Int8 * ) rtl_reallocateMemory( m_p , nNewLen );
+ if( !m_p ) {
+ throw IRingBuffer_OutOfMemoryException();
+ }
+
+ if( m_nStart + m_nOccupiedBuffer > m_nBufferLen ) {
+ memmove( &( m_p[m_nStart+(nNewLen-m_nBufferLen)]) , &(m_p[m_nStart]) , m_nBufferLen - m_nStart );
+ m_nStart += nNewLen - m_nBufferLen;
+ }
+ m_nBufferLen = nNewLen;
+ }
+}
+
+
+void MemRingBuffer::readAt( sal_Int32 nPos, Sequence<sal_Int8> &seq , sal_Int32 nBytesToRead ) const
+ throw(IRingBuffer_OutOfBoundsException)
+{
+ if( nPos + nBytesToRead > m_nOccupiedBuffer ) {
+ throw IRingBuffer_OutOfBoundsException();
+ }
+
+ sal_Int32 nStartReadingPos = nPos + m_nStart;
+ if( nStartReadingPos >= m_nBufferLen ) {
+ nStartReadingPos -= m_nBufferLen;
+ }
+
+ seq.realloc( nBytesToRead );
+
+ if( nStartReadingPos + nBytesToRead > m_nBufferLen ) {
+ sal_Int32 nDeltaLen = m_nBufferLen - nStartReadingPos;
+ memcpy( seq.getArray() , &(m_p[nStartReadingPos]) , nDeltaLen );
+ memcpy( &(seq.getArray()[nDeltaLen]), m_p , nBytesToRead - nDeltaLen );
+ }
+ else {
+ memcpy( seq.getArray() , &(m_p[nStartReadingPos]) , nBytesToRead );
+ }
+}
+
+
+void MemRingBuffer::writeAt( sal_Int32 nPos, const Sequence<sal_Int8> &seq )
+ throw (IRingBuffer_OutOfBoundsException,
+ IRingBuffer_OutOfMemoryException )
+{
+ checkInvariants();
+ sal_Int32 nLen = seq.getLength();
+
+ if( nPos > 0x80000000 || nPos < 0 || nPos + nLen < 0 || nPos + nLen > 0x80000000 )
+ {
+ throw IRingBuffer_OutOfBoundsException();
+ }
+
+ if( nPos + nLen - m_nOccupiedBuffer > 0 ) {
+ resizeBuffer( nPos + seq.getLength() );
+ }
+
+ sal_Int32 nStartWritingIndex = m_nStart + nPos;
+ if( nStartWritingIndex >= m_nBufferLen ) {
+ nStartWritingIndex -= m_nBufferLen;
+ }
+
+ if( nLen + nStartWritingIndex > m_nBufferLen ) {
+ // two area copy
+ memcpy( &(m_p[nStartWritingIndex]) , seq.getConstArray(), m_nBufferLen-nStartWritingIndex );
+ memcpy( m_p , &( seq.getConstArray()[m_nBufferLen-nStartWritingIndex] ),
+ nLen - (m_nBufferLen-nStartWritingIndex) );
+
+ }
+ else {
+ // one area copy
+ memcpy( &( m_p[nStartWritingIndex]), seq.getConstArray() , nLen );
+ }
+ m_nOccupiedBuffer = Max( nPos + seq.getLength() , m_nOccupiedBuffer );
+ checkInvariants();
+}
+
+
+sal_Int32 MemRingBuffer::getSize() const throw()
+{
+ return m_nOccupiedBuffer;
+}
+
+void MemRingBuffer::forgetFromStart( sal_Int32 nBytesToForget ) throw (IRingBuffer_OutOfBoundsException)
+{
+ checkInvariants();
+ if( nBytesToForget > m_nOccupiedBuffer ) {
+ throw IRingBuffer_OutOfBoundsException();
+ }
+ m_nStart += nBytesToForget;
+ if( m_nStart >= m_nBufferLen ) {
+ m_nStart = m_nStart - m_nBufferLen;
+ }
+ m_nOccupiedBuffer -= nBytesToForget;
+ checkInvariants();
+}
+
+
+void MemRingBuffer::forgetFromEnd( sal_Int32 nBytesToForget ) throw (IRingBuffer_OutOfBoundsException)
+{
+ checkInvariants();
+ if( nBytesToForget > m_nOccupiedBuffer ) {
+ throw IRingBuffer_OutOfBoundsException();
+ }
+ m_nOccupiedBuffer -= nBytesToForget;
+ checkInvariants();
+}
+
+
+void MemRingBuffer::shrink() throw ()
+{
+ checkInvariants();
+
+ // Up to now, only shrinking of while buffer works.
+ // No other shrinking supported up to now.
+ if( ! m_nOccupiedBuffer ) {
+ if( m_p ) {
+ free( m_p );
+ }
+ m_p = 0;
+ m_nBufferLen = 0;
+ m_nStart = 0;
+ }
+
+ checkInvariants();
+}
+
+}
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