| /************************************************************** |
| * |
| * 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 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| |
| // MARKER(update_precomp.py): autogen include statement, do not remove |
| #include "precompiled_io.hxx" |
| #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(); |
| } |
| |
| } |