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/*
Miranda IM: the free IM client for Microsoft* Windows*
Copyright 2000-12 Miranda IM, 2012-13 Miranda NG project,
all portions of this codebase are copyrighted to the people
listed in contributors.txt.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "commonheaders.h"
#include "m_string.h"
/////////////////////////////////////////////////////////////////////////////////////////
// CMBaseString
class CNilMStringData : public CMStringData
{
public:
CNilMStringData();
public:
wchar_t achNil[2];
};
CNilMStringData::CNilMStringData()
{
nRefs = 2; // Never gets freed
nDataLength = 0;
nAllocLength = 0;
achNil[0] = 0;
achNil[1] = 0;
}
static CNilMStringData m_nil;
/////////////////////////////////////////////////////////////////////////////////////////
// CMBaseString
MIR_CORE_DLL(CMStringData*) mirstr_allocate(int nChars, int nCharSize)
{
nChars++; // nil char
size_t nDataBytes = nCharSize * nChars;
size_t nTotalSize = nDataBytes + sizeof(CMStringData);
CMStringData *pData = static_cast<CMStringData*>(malloc(nTotalSize));
if (pData == NULL)
return NULL;
pData->nRefs = 1;
pData->nAllocLength = nChars - 1;
pData->nDataLength = 0;
return pData;
}
MIR_CORE_DLL(void) mirstr_free(CMStringData *pData)
{
free(pData);
}
MIR_CORE_DLL(CMStringData*) mirstr_realloc(CMStringData* pData, int nChars, int nCharSize)
{
nChars++; // nil char
ULONG nDataBytes = nCharSize * nChars;
ULONG nTotalSize = nDataBytes + sizeof(CMStringData);
CMStringData *pNewData = static_cast<CMStringData*>(realloc(pData, nTotalSize));
if (pNewData == NULL)
return NULL;
pNewData->nAllocLength = nChars - 1;
return pNewData;
}
MIR_CORE_DLL(CMStringData*) mirstr_getNil()
{
m_nil.AddRef();
return &m_nil;
}
/////////////////////////////////////////////////////////////////////////////////////////
// CMStringData
MIR_CORE_DLL(void) mirstr_lock(CMStringData* pThis)
{
pThis->nRefs--; // Locked buffers can't be shared, so no interlocked operation necessary
if (pThis->nRefs == 0)
pThis->nRefs = -1;
}
MIR_CORE_DLL(void) mirstr_release(CMStringData* pThis)
{
if (InterlockedDecrement(&pThis->nRefs) <= 0)
mirstr_free(pThis);
}
MIR_CORE_DLL(void) mirstr_unlock(CMStringData* pThis)
{
if (pThis->IsLocked())
{
pThis->nRefs++; // Locked buffers can't be shared, so no interlocked operation necessary
if (pThis->nRefs == 0)
pThis->nRefs = 1;
}
}
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