85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#pragma once
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#include <com/sun/star/uno/Sequence.hxx>
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#include <assert.h>
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using namespace com::sun::star::uno;
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namespace io_stm
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{
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class MemRingBuffer
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{
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public:
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MemRingBuffer();
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virtual ~MemRingBuffer();
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/***
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* overwrites data at given position. Size is automatically extended, when
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* data is written beyond end.
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***/
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/// @throws css::io::BufferSizeExceededException
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void writeAt( sal_Int32 nPos, const Sequence<sal_Int8> &);
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/// @throws css::io::BufferSizeExceededException
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void readAt( sal_Int32 nPos, Sequence<sal_Int8> & , sal_Int32 nBytesToRead ) const;
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sal_Int32 getSize() const noexcept;
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/// @throws css::io::BufferSizeExceededException
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void forgetFromStart(sal_Int32 nBytesToForget);
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private:
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/// @throws css::io::BufferSizeExceededException
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void resizeBuffer(sal_Int32 nMinSize);
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void checkInvariants() const {
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assert( m_nBufferLen >= 0 );
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assert( m_nOccupiedBuffer >= 0 );
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assert( m_nOccupiedBuffer <= m_nBufferLen );
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assert( m_nStart >= 0 );
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assert( 0 == m_nStart || m_nStart < m_nBufferLen );
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(void) this; // avoid loplugin:staticmethods
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}
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sal_Int8 *m_p;
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sal_Int32 m_nBufferLen;
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sal_Int32 m_nStart;
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sal_Int32 m_nOccupiedBuffer;
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};
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class MemFIFO :
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private MemRingBuffer
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{
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public:
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/// @throws css::io::BufferSizeExceededException
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void write( const Sequence<sal_Int8> &);
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/// @throws css::io::BufferSizeExceededException
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void read( Sequence<sal_Int8> & , sal_Int32 nBytesToRead );
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/// @throws css::io::BufferSizeExceededException
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void skip( sal_Int32 nBytesToSkip );
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sal_Int32 getSize() const noexcept
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{ return MemRingBuffer::getSize(); }
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};
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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