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-rw-r--r--io/source/stm/streamhelper.cxx173
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diff --git a/io/source/stm/streamhelper.cxx b/io/source/stm/streamhelper.cxx
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+/* -*- 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 <limits>
+#include <string.h>
+
+#include <com/sun/star/uno/Sequence.hxx>
+
+#include <com/sun/star/io/BufferSizeExceededException.hpp>
+
+using namespace ::com::sun::star::uno;
+
+#include "streamhelper.hxx"
+
+namespace io_stm {
+
+void MemFIFO::write( const Sequence< sal_Int8 > &seq )
+{
+ writeAt(getSize(), seq);
+}
+
+void MemFIFO::read( Sequence<sal_Int8> &seq , sal_Int32 nBufferLen )
+{
+ readAt(0, seq , nBufferLen);
+ forgetFromStart( nBufferLen );
+}
+
+void MemFIFO::skip( sal_Int32 nBytesToSkip )
+{
+ forgetFromStart( nBytesToSkip );
+}
+
+MemRingBuffer::MemRingBuffer() : m_p(nullptr), m_nBufferLen(0), m_nStart(0), m_nOccupiedBuffer(0)
+{
+}
+
+MemRingBuffer::~MemRingBuffer()
+{
+ std::free( m_p );
+}
+
+void MemRingBuffer::resizeBuffer( sal_Int32 nMinSize )
+{
+ sal_Int32 nNewLen = 1;
+
+ while( nMinSize > nNewLen ) {
+ nNewLen = nNewLen << 1;
+ }
+
+ // buffer never shrinks !
+ if( nNewLen < m_nBufferLen ) {
+ nNewLen = m_nBufferLen;
+ }
+
+ if( nNewLen == m_nBufferLen )
+ return;
+
+ auto p = static_cast<sal_Int8*>(std::realloc(m_p, nNewLen));
+ if (!p)
+ throw css::io::BufferSizeExceededException(
+ "MemRingBuffer::resizeBuffer BufferSizeExceededException");
+
+ m_p = p;
+
+
+ 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
+{
+ if( nPos + nBytesToRead > m_nOccupiedBuffer ) {
+ throw css::io::BufferSizeExceededException(
+ "MemRingBuffer::readAt BufferSizeExceededException");
+ }
+
+ 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 )
+{
+ checkInvariants();
+ const sal_Int32 nLen = seq.getLength();
+
+ if( nPos < 0 || nPos > std::numeric_limits< sal_Int32 >::max() - nLen )
+ {
+ throw css::io::BufferSizeExceededException(
+ "MemRingBuffer::writeAt BufferSizeExceededException");
+ }
+
+ if( nPos + nLen - m_nOccupiedBuffer > 0 ) {
+ resizeBuffer( nPos + nLen );
+ m_nOccupiedBuffer = nPos + nLen;
+ }
+
+ sal_Int32 nStartWritingIndex = m_nStart + nPos;
+ if( nStartWritingIndex >= m_nBufferLen ) {
+ nStartWritingIndex -= m_nBufferLen;
+ }
+
+ if( const sal_Int32 nBufferRestLen = m_nBufferLen-nStartWritingIndex; nLen > nBufferRestLen ) {
+ // two area copy
+ memcpy( &(m_p[nStartWritingIndex]) , seq.getConstArray(), nBufferRestLen );
+ memcpy( m_p , &( seq.getConstArray()[nBufferRestLen] ), nLen - nBufferRestLen );
+
+ }
+ else {
+ // one area copy
+ memcpy( &( m_p[nStartWritingIndex]), seq.getConstArray() , nLen );
+ }
+ checkInvariants();
+}
+
+
+sal_Int32 MemRingBuffer::getSize() const throw()
+{
+ return m_nOccupiedBuffer;
+}
+
+void MemRingBuffer::forgetFromStart( sal_Int32 nBytesToForget )
+{
+ checkInvariants();
+ if( nBytesToForget > m_nOccupiedBuffer ) {
+ throw css::io::BufferSizeExceededException(
+ "MemRingBuffer::forgetFromStart BufferSizeExceededException");
+ }
+ m_nStart += nBytesToForget;
+ if( m_nStart >= m_nBufferLen ) {
+ m_nStart = m_nStart - m_nBufferLen;
+ }
+ m_nOccupiedBuffer -= nBytesToForget;
+ checkInvariants();
+}
+
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */