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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: streamhelper.cxx,v $
*
* $Revision: 1.4 $
*
* last change: $Author: hr $ $Date: 2006-06-20 00:18:25 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 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
*
************************************************************************/
#include <rtl/alloc.h>
#include <limits>
#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 < 0 || nPos > std::numeric_limits< sal_Int32 >::max() - nLen )
{
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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