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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 .
+ */
+
+#ifndef INCLUDED_IO_SOURCE_STM_STREAMHELPER_HXX
+#define INCLUDED_IO_SOURCE_STM_STREAMHELPER_HXX
+
+#include <com/sun/star/uno/Sequence.hxx>
+
+#include <assert.h>
+
+using namespace com::sun::star::uno;
+
+namespace io_stm
+{
+
+class MemRingBuffer
+{
+public:
+ MemRingBuffer();
+ virtual ~MemRingBuffer();
+
+ /***
+ * overwrites data at given position. Size is automatically extended, when
+ * data is written beyond end.
+ ***/
+ /// @throws css::io::BufferSizeExceededException
+ void writeAt( sal_Int32 nPos, const Sequence<sal_Int8> &);
+ /// @throws css::io::BufferSizeExceededException
+ void readAt( sal_Int32 nPos, Sequence<sal_Int8> & , sal_Int32 nBytesToRead ) const;
+ sal_Int32 getSize() const throw();
+ /// @throws css::io::BufferSizeExceededException
+ void forgetFromStart(sal_Int32 nBytesToForget);
+
+private:
+ /// @throws css::io::BufferSizeExceededException
+ void resizeBuffer(sal_Int32 nMinSize);
+ void checkInvariants() const {
+ assert( m_nBufferLen >= 0 );
+ assert( m_nOccupiedBuffer >= 0 );
+ assert( m_nOccupiedBuffer <= m_nBufferLen );
+ assert( m_nStart >= 0 );
+ assert( 0 == m_nStart || m_nStart < m_nBufferLen );
+ (void) this; // avoid loplugin:staticmethods
+ }
+
+ sal_Int8 *m_p;
+ sal_Int32 m_nBufferLen;
+ sal_Int32 m_nStart;
+ sal_Int32 m_nOccupiedBuffer;
+};
+
+
+class MemFIFO :
+ private MemRingBuffer
+{
+public:
+ /// @throws css::io::BufferSizeExceededException
+ void write( const Sequence<sal_Int8> &);
+ /// @throws css::io::BufferSizeExceededException
+ void read( Sequence<sal_Int8> & , sal_Int32 nBytesToRead );
+ /// @throws css::io::BufferSizeExceededException
+ void skip( sal_Int32 nBytesToSkip );
+ sal_Int32 getSize() const throw()
+ { return MemRingBuffer::getSize(); }
+
+};
+
+}
+
+#endif // INCLUDED_IO_SOURCE_STM_STREAMHELPER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */