1 files changed, 244 insertions, 0 deletions
diff --git a/io/source/stm/streamhelper.cxx b/io/source/stm/streamhelper.cxx
new file mode 100644
index 000000000000..408581f6667d
--- /dev/null
+++ b/io/source/stm/streamhelper.cxx
@@ -0,0 +1,244 @@
+/*************************************************************************
+ *
+ * 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_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();
+}
+
+}