source: downloads/ogre/Tools/3dsmaxExport/LEXIExporter/SharedUtilities/Sources/DataStream.cpp @ 45

/*
-----------------------------------------------------------------------------
This source file is part of LEXIExporter

Copyright 2006 NDS Limited

Author(s):
Lasse Tassing

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser 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, or go to
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/

#include "StdAfx.h"

CDataStream::CDataStream(unsigned iInitSize, unsigned iGrow)
{
        // Initialize data
        m_iAllocSize=iInitSize;
        m_iGrowSize=iGrow;
        m_iPosition=0;
        m_pData=new char[m_iAllocSize];
        m_bOwnData=true;
        m_pDataOwner=NULL;
#ifdef _DEBUG
        m_iReallocCount=0; 
#endif
}
CDataStream::CDataStream(const CDataStream &other)
{
        // Setup data from other instance (reference only, data will be copied if needed)
        m_iAllocSize=other.m_iAllocSize;
        m_iGrowSize=other.m_iGrowSize;
        m_iPosition=other.m_iPosition;
        m_pData=other.m_pData;  
        m_bOwnData=false;
        m_pDataOwner=&other;
        other.AddRef();
#ifdef _DEBUG
        m_iReallocCount=0; 
#endif
}
CDataStream::CDataStream(const void *pOther, unsigned iSize, CRefCount *pDataOwner)
{
        // Setup data, optionally including data owner
        m_iAllocSize=iSize;
        m_iGrowSize=512;
        m_iPosition=0;
        m_pData=(char*)pOther;
        m_bOwnData=false;
        m_pDataOwner=pDataOwner;
        if(m_pDataOwner) m_pDataOwner->AddRef();
#ifdef _DEBUG
        m_iReallocCount=0; 
#endif
}
CDataStream::CDataStream(void *pOther, unsigned iSize)
{
        // Setup data, optionally including data owner
        m_iAllocSize=iSize;
        m_iGrowSize=512;
        m_iPosition=0;
        m_pData=(char*)pOther;
        m_bOwnData=true;        
        m_pDataOwner=0;
#ifdef _DEBUG
        m_iReallocCount=0; 
#endif
}

CDataStream::~CDataStream(void)
{
        if(m_bOwnData)  delete[] m_pData;
        else if(m_pDataOwner) m_pDataOwner->Release();
}

// Insert integer at a position
void CDataStream::InsertInt(int iData, int iPosition)
{
        if(m_iPosition+4>m_iAllocSize) Realloc(4);
        memmove(m_pData+iPosition+4, m_pData+iPosition, m_iPosition-iPosition);
        *((int*)(m_pData+iPosition))=iData;
        m_iPosition+=4;
}
void CDataStream::InsertString(const char *pszData, int iPosition)
{
        int iLen=strlen(pszData)+1;

        if(m_iPosition+iLen>m_iAllocSize) Realloc(iLen);
        memmove(m_pData+iPosition+iLen, m_pData+iPosition, m_iPosition-iPosition);
        memcpy(m_pData+iPosition, pszData, iLen);       
        m_iPosition+=iLen;
}

// Add
void CDataStream::AddByte(unsigned char bData)
{
        if(m_iPosition+1>m_iAllocSize || !m_bOwnData) Realloc(1);
        *((unsigned char*)(m_pData+m_iPosition))=bData;
        m_iPosition+=1;
}
void CDataStream::AddInt(int iData)
{
        if(m_iPosition+4>m_iAllocSize || !m_bOwnData) Realloc(4);
        *((int*)(m_pData+m_iPosition))=iData;
        m_iPosition+=4;
}
void CDataStream::AddFloat(float fData)
{
        if(m_iPosition+4>m_iAllocSize || !m_bOwnData) Realloc(4);
        *((float*)(m_pData+m_iPosition))=fData;
        m_iPosition+=4;
}
/*void CDataStream::AddString(const faststring &sData)
{
        int iLen=sData.size()+1;
        if(m_iPosition+iLen>m_iAllocSize || !m_bOwnData) Realloc(iLen);
        memcpy(m_pData+m_iPosition, sData.c_str(), iLen);
        m_iPosition+=iLen;
}*/
void CDataStream::AddString(const char *pszData)
{
        int iLen=strlen(pszData)+1;
        if(m_iPosition+iLen>m_iAllocSize || !m_bOwnData) Realloc(iLen);
        memcpy(m_pData+m_iPosition, pszData, iLen);
        m_iPosition+=iLen;
}
void CDataStream::AddBinary(const void *pData, unsigned iLen)
{
        AddInt(iLen);
        if(m_iPosition+iLen>m_iAllocSize) Realloc(iLen);
        memcpy(m_pData+m_iPosition, pData, iLen);
        m_iPosition+=iLen;
}
void CDataStream::AddRAW(const void *pData, unsigned iLen)
{
        if(m_iPosition+iLen>m_iAllocSize) Realloc(iLen);
        memcpy(m_pData+m_iPosition, pData, iLen);
        m_iPosition+=iLen;
}
void CDataStream::AddBool(bool bData)
{
        if(m_iPosition+1>m_iAllocSize || !m_bOwnData) Realloc(1);
        *((bool*)(m_pData+m_iPosition))=bData;
        m_iPosition+=1;
}

// Retrieve
unsigned char CDataStream::GetByte(void) const
{
        m_iPosition+=1;
        return *(unsigned char*)((char*)(m_pData+(m_iPosition-1)));
}
int     CDataStream::GetInt(void) const
{
        m_iPosition+=4;
        return *(int*)((char*)(m_pData+(m_iPosition-4)));
}
float CDataStream::GetFloat(void) const
{
        m_iPosition+=4;
        return *(float*)((char*)(m_pData+(m_iPosition-4)));
}
const char *CDataStream::GetString(void) const
{
        const char *pStr=m_pData+m_iPosition;
        m_iPosition+=strlen(pStr)+1;
        return pStr;
}
const void *CDataStream::GetBinary(unsigned &iLen) const
{
        iLen=GetInt();
        const void *pRet=m_pData+m_iPosition;
        m_iPosition+=iLen;
        return pRet;
}
const void* CDataStream::GetRAW(unsigned int iLen) const
{
        const void *pRet=m_pData+m_iPosition;
        m_iPosition+=iLen;
        return pRet;
}
bool CDataStream::GetBool() const
{
        m_iPosition+=1;
        return *(bool*)((char*)(m_pData+(m_iPosition-1)));
}

// Reset position
void CDataStream::SetPosition(unsigned iPos) const
{
        if(iPos<=m_iAllocSize && iPos>=0) m_iPosition=iPos;
}
int     CDataStream::GetPosition(void) const
{
        return m_iPosition;
}

//
void CDataStream::Reserve(unsigned int iNewAlloc)
{
        if(m_iAllocSize<iNewAlloc) Realloc(iNewAlloc-m_iAllocSize);
}

void CDataStream::Realloc(int iSpaceNeeded)
{
        // Allocate new chunk
        char *pNewData=new char[m_iAllocSize+iSpaceNeeded+m_iGrowSize];
        memcpy(pNewData, m_pData, m_iAllocSize);
        if(m_bOwnData) delete[] m_pData;
        m_pData=pNewData;
        m_iAllocSize+=iSpaceNeeded+m_iGrowSize;

        // Did we previously own data?
        if(!m_bOwnData)
        {
                // Nope, did we have a data owner reference?
                if(m_pDataOwner) 
                {
                        // Yep, release data owner
                        m_pDataOwner->Release();
                        m_pDataOwner=NULL;
                }
                // We own the data now
                m_bOwnData=true;
        }

#ifdef _DEBUG
        if(++m_iReallocCount>5) LOGWARNING "Performance warning, datastream realloccount>5 %X, size=%d", (int)this, m_iAllocSize);
#endif
}