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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 .
*/
static sal_Int32 ImplStringCompareWithoutZero( const STRCODE* pStr1, const STRCODE* pStr2,
sal_Int32 nCount )
{
sal_Int32 nRet = 0;
while ( nCount &&
((nRet = ((sal_Int32)((STRCODEU)*pStr1))-((sal_Int32)((STRCODEU)*pStr2))) == 0) )
{
++pStr1,
++pStr2,
--nCount;
}
return nRet;
}
static STRINGDATA* ImplAllocData( sal_Int32 nLen )
{
STRINGDATA* pData = (STRINGDATA*)rtl_allocateMemory( sizeof(STRINGDATA)+(nLen*sizeof( STRCODE )) );
pData->mnRefCount = 1;
pData->mnLen = nLen;
pData->maStr[nLen] = 0;
return pData;
}
static STRINGDATA* _ImplCopyData( STRINGDATA* pData )
{
unsigned int nSize = sizeof(STRINGDATA)+(pData->mnLen*sizeof( STRCODE ));
STRINGDATA* pNewData = (STRINGDATA*)rtl_allocateMemory( nSize );
memcpy( pNewData, pData, nSize );
pNewData->mnRefCount = 1;
STRING_RELEASE((STRING_TYPE *)pData);
return pNewData;
}
inline void STRING::ImplCopyData()
{
DBG_ASSERT( (mpData->mnRefCount != 0), "String::ImplCopyData() - RefCount == 0" );
// Dereference data if this string is referenced
if ( mpData->mnRefCount != 1 )
mpData = _ImplCopyData( mpData );
}
inline STRCODE* STRING::ImplCopyStringData( STRCODE* pStr )
{
if ( mpData->mnRefCount != 1 ) {
DBG_ASSERT( (pStr >= mpData->maStr) &&
((pStr-mpData->maStr) < mpData->mnLen),
"ImplCopyStringData - pStr from other String-Instanz" );
unsigned int nIndex = (unsigned int)(pStr-mpData->maStr);
mpData = _ImplCopyData( mpData );
pStr = mpData->maStr + nIndex;
}
return pStr;
}
inline sal_Int32 ImplGetCopyLen( sal_Int32 nStrLen, sal_Int32 nCopyLen )
{
OSL_ASSERT(nStrLen <= STRING_MAXLEN && nCopyLen <= STRING_MAXLEN);
if ( nCopyLen > STRING_MAXLEN-nStrLen )
nCopyLen = STRING_MAXLEN-nStrLen;
return nCopyLen;
}
STRING::STRING()
: mpData(NULL)
{
STRING_NEW((STRING_TYPE **)&mpData);
}
STRING::STRING( const STRING& rStr )
{
// Set pointer to argument string and increase reference counter
STRING_ACQUIRE((STRING_TYPE *)rStr.mpData);
mpData = rStr.mpData;
}
STRING::~STRING()
{
// free string data
STRING_RELEASE((STRING_TYPE *)mpData);
}
STRING& STRING::Append( const STRING& rStr )
{
// Assignment is sufficient if string is empty
sal_Int32 nLen = mpData->mnLen;
if ( !nLen )
{
STRING_ACQUIRE((STRING_TYPE *)rStr.mpData);
STRING_RELEASE((STRING_TYPE *)mpData);
mpData = rStr.mpData;
}
else
{
// Detect overflow
sal_Int32 nCopyLen = ImplGetCopyLen( nLen, rStr.mpData->mnLen );
if ( nCopyLen )
{
// allocate string of new size
STRINGDATA* pNewData = ImplAllocData( nLen+nCopyLen );
// copy string
memcpy( pNewData->maStr, mpData->maStr, nLen*sizeof( STRCODE ) );
memcpy( pNewData->maStr+nLen, rStr.mpData->maStr, nCopyLen*sizeof( STRCODE ) );
// free old string
STRING_RELEASE((STRING_TYPE *)mpData);
mpData = pNewData;
}
}
return *this;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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