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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 noexcept
{
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: */
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