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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 <buffer.hxx>
#include <parser.hxx>
#include <basic/sberrors.hxx>
const static sal_uInt32 UP_LIMIT=0xFFFFFF00;
// The SbiBuffer will be expanded in increments of at least 16 Bytes.
// This is necessary, because many classes emanate from a buffer length
// of x*16 Bytes.
SbiBuffer::SbiBuffer( SbiParser* p, short n )
{
pParser = p;
n = ( (n + 15 ) / 16 ) * 16;
if( !n ) n = 16;
pBuf = nullptr;
pCur = nullptr;
nInc = n;
nSize =
nOff = 0;
}
SbiBuffer::~SbiBuffer()
{
}
// Reach out the buffer
// This lead to the deletion of the buffer!
char* SbiBuffer::GetBuffer()
{
char* p = pBuf.release();
pCur = nullptr;
return p;
}
// Test, if the buffer can contain n Bytes.
// In case of doubt it will be enlarged
bool SbiBuffer::Check( sal_Int32 n )
{
if( !n )
{
return true;
}
if( nOff + n > nSize )
{
if( nInc == 0 )
{
return false;
}
sal_Int32 nn = 0;
while( nn < n )
{
nn = nn + nInc;
}
char* p;
if( ( nSize + nn ) > UP_LIMIT )
{
p = nullptr;
}
else
{
p = new char [nSize + nn];
}
if( !p )
{
pParser->Error( ERRCODE_BASIC_PROG_TOO_LARGE );
nInc = 0;
pBuf.reset();
return false;
}
else
{
if( nSize ) memcpy( p, pBuf.get(), nSize );
pBuf.reset(p);
pCur = pBuf.get() + nOff;
nSize = nSize + nn;
}
}
return true;
}
// Patch of a Location
void SbiBuffer::Patch( sal_uInt32 off, sal_uInt32 val )
{
if( ( off + sizeof( sal_uInt32 ) ) < nOff )
{
sal_uInt16 val1 = static_cast<sal_uInt16>( val & 0xFFFF );
sal_uInt16 val2 = static_cast<sal_uInt16>( val >> 16 );
sal_uInt8* p = reinterpret_cast<sal_uInt8*>(pBuf.get()) + off;
*p++ = static_cast<char>( val1 & 0xFF );
*p++ = static_cast<char>( val1 >> 8 );
*p++ = static_cast<char>( val2 & 0xFF );
*p = static_cast<char>( val2 >> 8 );
}
}
// Forward References upon label and procedures
// establish a linkage. The beginning of the linkage is at the passed parameter,
// the end of the linkage is 0.
void SbiBuffer::Chain( sal_uInt32 off )
{
if( !(off && pBuf) )
return;
sal_uInt8 *ip;
sal_uInt32 i = off;
sal_uInt32 val1 = (nOff & 0xFFFF);
sal_uInt32 val2 = (nOff >> 16);
do
{
ip = reinterpret_cast<sal_uInt8*>(pBuf.get()) + i;
sal_uInt8* pTmp = ip;
i = *pTmp++; i |= *pTmp++ << 8; i |= *pTmp++ << 16; i |= *pTmp++ << 24;
if( i >= nOff )
{
pParser->Error( ERRCODE_BASIC_INTERNAL_ERROR, "BACKCHAIN" );
break;
}
*ip++ = static_cast<char>( val1 & 0xFF );
*ip++ = static_cast<char>( val1 >> 8 );
*ip++ = static_cast<char>( val2 & 0xFF );
*ip = static_cast<char>( val2 >> 8 );
} while( i );
}
void SbiBuffer::operator +=( sal_Int8 n )
{
if( Check( 1 ) )
{
*pCur++ = static_cast<char>(n);
nOff += 1;
}
}
bool SbiBuffer::operator +=( sal_uInt8 n )
{
if( Check( 1 ) )
{
*pCur++ = static_cast<char>(n);
nOff += 1;
return true;
}
else
{
return false;
}
}
void SbiBuffer::operator +=( sal_Int16 n )
{
if( Check( 2 ) )
{
*pCur++ = static_cast<char>( n & 0xFF );
*pCur++ = static_cast<char>( n >> 8 );
nOff += 2;
}
}
bool SbiBuffer::operator +=( sal_uInt16 n )
{
if( Check( 2 ) )
{
*pCur++ = static_cast<char>( n & 0xFF );
*pCur++ = static_cast<char>( n >> 8 );
nOff += 2;
return true;
}
else
{
return false;
}
}
bool SbiBuffer::operator +=( sal_uInt32 n )
{
if( Check( 4 ) )
{
sal_uInt16 n1 = static_cast<sal_uInt16>( n & 0xFFFF );
sal_uInt16 n2 = static_cast<sal_uInt16>( n >> 16 );
operator +=(n1) && operator +=(n2);
return true;
}
else
{
return false;
}
}
void SbiBuffer::operator +=( sal_Int32 n )
{
operator +=( static_cast<sal_uInt32>(n) );
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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