pckunpck.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

	res = pTempBuf->SetSize(4096);
	HX_ASSERT(SUCCEEDED(res));
	if (SUCCEEDED(res))
	{
	    // fill up the buffer
	    UCHAR* pData = pTempBuf->GetBuffer();
	    int i;
	    for (i = 0; i < 4096; i++)
	    {
		pData[i] = i & 0xff;
	    }
	    
	    res = PackBuffer(pParams, "ufbau", 69, FALSE, pTempBuf, "foobar", 666);
	    HX_ASSERT(SUCCEEDED(res));
	    if (SUCCEEDED(res))
	    {
		UINT32 nArg1, nArg5;
		BOOL bArg2;
		IHXBuffer* pArg3;
		CHXString sArg4;
		
		const char* pTemp = (const char*)pParams->GetBuffer();
		int nCount = UnpackBuffer(pTemp, "ufbau", &nArg1, &bArg2, &pArg3, &sArg4, &nArg5);
		HX_ASSERT(nCount == 5);
		HX_ASSERT(*pTemp == '\0');
		
		HX_ASSERT(nArg1 == 69 && bArg2 == FALSE && nArg5 == 666);
		HX_ASSERT(sArg4 == "foobar");
		HX_ASSERT(pArg3 && pArg3->GetSize() == 4096);
		if (pArg3 && pArg3->GetSize() == 4096)
		{
		    pData = pArg3->GetBuffer();
		    for (i = 0; i < 4096; i++)
		    {
			HX_ASSERT(pData[i] == (i & 0xff));
		    }
		}
		HX_RELEASE(pArg3);
	    }
	}
	
	HX_RELEASE(pTempBuf);
    }
}
#endif

UINT32 GetBinaryPackedSize(IHXValues* pValues)
{
    UINT32 ulRet = 0;

    if (pValues)
    {
        // Run through the ULONG32 properties
        const char* pszName = NULL;
        UINT32      ulValue = 0;
        HX_RESULT rv = pValues->GetFirstPropertyULONG32(pszName, ulValue);
        while (SUCCEEDED(rv))
        {
            // Add size of name/value type character: 'u'
            ulRet += 1;
            // Add size of name string plus NULL terminator
            ulRet += (UINT32) strlen(pszName) + 1;
            // Add 4 bytes for packing ULONG32
            ulRet += 4;
            // Get next ULONG32 prop
            rv = pValues->GetNextPropertyULONG32(pszName, ulValue);
        }
        // Run through the CString properties
        IHXBuffer* pValue = NULL;
        rv = pValues->GetFirstPropertyCString(pszName, pValue);
        while (SUCCEEDED(rv))
        {
            // Add size of name/value type character: 'c'
            ulRet += 1;
            // Add size of name string plus NULL terminator
            ulRet += (UINT32) strlen(pszName) + 1;
            // Add size of value string plus NULL terminator
            ulRet += strlen((const char*) pValue->GetBuffer()) + 1;
            // Get next CString prop
            HX_RELEASE(pValue);
            rv = pValues->GetNextPropertyCString(pszName, pValue);
        }
        // Run through the Buffer properties
        rv = pValues->GetFirstPropertyBuffer(pszName, pValue);
        while (SUCCEEDED(rv))
        {
            // Add size of name/value type character: 'b'
            ulRet += 1;
            // Add size of name string plus NULL terminator
            ulRet += (UINT32) strlen(pszName) + 1;
            // Add size of value buffer size (4 bytes)
            ulRet += 4;
            // Add size of value buffer
            ulRet += pValue->GetSize();
            // Get next Buffer prop
            HX_RELEASE(pValue);
            rv = pValues->GetNextPropertyBuffer(pszName, pValue);
        }
    }

    return ulRet;
}

HX_RESULT PackValuesBinary(IHXBuffer* pBuffer,
                           IHXValues* pValues)
{
    HX_RESULT retVal = HXR_FAIL;

    if (pValues && pBuffer)
    {
        // Make sure the buffer is big enough
        UINT32 ulMinSize = GetBinaryPackedSize(pValues);
        // Is our buffer big enough?
        if (ulMinSize && pBuffer->GetSize() >= ulMinSize)
        {
            // Ok, pack that puppy
            BYTE* pBuf = pBuffer->GetBuffer();
            if (pBuf)
            {
                // Clear the return value
                retVal = HXR_OK;
                // Run through the ULONG32 properties
                const char* pszName = NULL;
                UINT32      ulValue = 0;
                HX_RESULT rv = pValues->GetFirstPropertyULONG32(pszName, ulValue);
                while (SUCCEEDED(rv))
                {
                    // Copy name/value type character: 'u'
                    *pBuf++ = (BYTE) 'u';
                    // Copy name string plus NULL terminator
                    UINT32 ulBytes = (UINT32) strlen(pszName) + 1;
                    memcpy(pBuf, pszName, ulBytes);
                    pBuf += ulBytes;
                    // Copy ULONG32 in big-endian format (high byte first)
                    *pBuf++ = (BYTE) ((ulValue >> 24) & 0x000000FF);
                    *pBuf++ = (BYTE) ((ulValue >> 16) & 0x000000FF);
                    *pBuf++ = (BYTE) ((ulValue >>  8) & 0x000000FF);
                    *pBuf++ = (BYTE) ( ulValue        & 0x000000FF);
                    // Get next ULONG32 prop
                    rv = pValues->GetNextPropertyULONG32(pszName, ulValue);
                }
                // Run through the CString properties
                IHXBuffer* pValue = NULL;
                rv = pValues->GetFirstPropertyCString(pszName, pValue);
                while (SUCCEEDED(rv))
                {
                    // Copy name/value type character: 'c'
                    *pBuf++ = (BYTE) 'c';
                    // Copy name string plus NULL terminator
                    UINT32 ulBytes = (UINT32) strlen(pszName) + 1;
                    memcpy(pBuf, pszName, ulBytes);
                    pBuf += ulBytes;
                    // Copy value string plus NULL terminator
                    const char* pszValue = (const char*) pValue->GetBuffer();
                    ulBytes = (UINT32) strlen(pszValue) + 1;
                    memcpy(pBuf, pszValue, ulBytes);
                    pBuf += ulBytes;
                    // Get next CString prop
                    HX_RELEASE(pValue);
                    rv = pValues->GetNextPropertyCString(pszName, pValue);
                }
                // Run through the Buffer properties
                rv = pValues->GetFirstPropertyBuffer(pszName, pValue);
                while (SUCCEEDED(rv))
                {
                    // Copy name/value type character: 'b'
                    *pBuf++ = (BYTE) 'b';
                    // Copy name string plus NULL terminator
                    UINT32 ulBytes = (UINT32) strlen(pszName) + 1;
                    memcpy(pBuf, pszName, ulBytes);
                    pBuf += ulBytes;
                    // Copy value buffer size in big-endian format
                    UINT32 ulSize = pValue->GetSize();
                    *pBuf++ = (BYTE) ((ulSize >> 24) & 0x000000FF);
                    *pBuf++ = (BYTE) ((ulSize >> 16) & 0x000000FF);
                    *pBuf++ = (BYTE) ((ulSize >>  8) & 0x000000FF);
                    *pBuf++ = (BYTE) ( ulSize        & 0x000000FF);
                    // Copy value buffer
                    memcpy(pBuf, pValue->GetBuffer(), ulSize);
                    pBuf += ulSize;
                    // Get next Buffer prop
                    HX_RELEASE(pValue);
                    rv = pValues->GetNextPropertyBuffer(pszName, pValue);
                }
            }
        }
    }

    return retVal;
}

HX_RESULT CreateBuffer(REF(IHXBuffer*) rpBuffer,
                       IUnknown*        pContext)
{
    HX_RESULT retVal = HXR_FAIL;

    // Were we given a context?
    if (pContext)
    {
        // Yes, we have a context, use it to create the buffer
        //
        // Get the CCF
        IHXCommonClassFactory* pCCF = NULL;
        retVal = pContext->QueryInterface(IID_IHXCommonClassFactory,
                                          (void**) &pCCF);
        if (SUCCEEDED(retVal))
        {
            // Create a buffer
            HX_RELEASE(rpBuffer);
            retVal = pCCF->CreateInstance(CLSID_IHXBuffer,
                                          (void**) &rpBuffer);
        }
        HX_RELEASE(pCCF);
    }
    else
    {
        // No, we don't have a context, so use CHXBuffer
        CHXBuffer* pBuffer = new CHXBuffer();
        if (pBuffer)
        {
            // Assign the out parameter
            HX_RELEASE(rpBuffer);
            rpBuffer = (IHXBuffer*) pBuffer;
            rpBuffer->AddRef();
            // Clear the return value
            retVal = HXR_OK;
        }
    }

    return retVal;
}

HX_RESULT CreateValues(REF(IHXValues*) rpValues,
                       IUnknown*        pContext)
{
    HX_RESULT retVal = HXR_FAIL;

    // Were we given a context?
    if (pContext)
    {
        // Yes, we have a context, use it to create the IHXValues
        //
        // Get the CCF
        IHXCommonClassFactory* pCCF = NULL;
        retVal = pContext->QueryInterface(IID_IHXCommonClassFactory,
                                          (void**) &pCCF);
        if (SUCCEEDED(retVal))
        {
            // Create an IHXValues
            HX_RELEASE(rpValues);
            retVal = pCCF->CreateInstance(CLSID_IHXValues,
                                          (void**) &rpValues);
        }
        HX_RELEASE(pCCF);
    }
    else
    {
        // No, we don't have a context, so use CHXBuffer
        CHXHeader* pValues = new CHXHeader();
        if (pValues)
        {
            // Assign the out parameter
            HX_RELEASE(rpValues);
            rpValues = (IHXValues*) pValues;
            rpValues->AddRef();
            // Clear the return value
            retVal = HXR_OK;
        }
    }

    return retVal;
}

HX_RESULT CreateStringBuffer(REF(IHXBuffer*) rpBuffer,
                             const char*      pszStr,
                             IUnknown*        pContext)
{
    HX_RESULT retVal = HXR_FAIL;

    if (pszStr)
    {
        // Create a buffer
        IHXBuffer* pBuffer = NULL;
        retVal = CreateBuffer(pBuffer, pContext);
        if (SUCCEEDED(retVal))
        {
            // Set the string into the buffer
            retVal = pBuffer->Set((const UCHAR*) pszStr, strlen(pszStr) + 1);
            if (SUCCEEDED(retVal))
            {
                // Assign the out parameters
                HX_RELEASE(rpBuffer);
                rpBuffer = pBuffer;
                rpBuffer->AddRef();
            }
        }
        HX_RELEASE(pBuffer);
    }

    return retVal;
}

HX_RESULT SetCStringProperty(IHXValues* pValues,
                             const char* pszName,
                             const char* pszValue,
                             IUnknown*   pContext,
                             BOOL        bSetAsBufferProp)
{
    HX_RESULT retVal = HXR_FAIL;

    if (pValues && pszName && pszValue)
    {
        // Create value buffer
        IHXBuffer* pValue = NULL;
        retVal = CreateStringBuffer(pValue, pszValue, pContext);
        if (SUCCEEDED(retVal))
        {
            // Set the property
            if (bSetAsBufferProp)
            {
                retVal = pValues->SetPropertyBuffer(pszName, pValue);
            }
            else
            {
                retVal = pValues->SetPropertyCString(pszName, pValue);
            }
        }
        HX_RELEASE(pValue);
    }

    return retVal;
}

HX_RESULT SetCStringPropertyWithNullTerm(IHXValues*  pValues,
                                         const char* pszName,
                                         BYTE*       pBuf,
                                         UINT32      ulLen,
                                         IUnknown*   pContext,
                                         BOOL        bSetAsBufferProp)
{
    HX_RESULT retVal = HXR_FAIL;

    if (pValues && pszName && pBuf && ulLen)
    {
        // Create value buffer
        IHXBuffer* pValue = NULL;
        retVal = CreateBuffer(pValue, pContext);
        if (SUCCEEDED(retVal))
        {
            // Set the buffer size
            retVal = pValue->SetSize(ulLen + 1);
            if (SUCCEEDED(retVal))
            {
                // Get the buffer pointer
                BYTE* pValBuf = pValue->GetBuffer();
                if (pValBuf)
                {
                    // memcpy the buffer
                    memcpy(pValBuf, pBuf, ulLen); /* Flawfinder: ignore */
                    // Add the NULL-terminator
                    pValBuf[ulLen] = (BYTE) '\0';
                    // Are we setting as a buffer property?
                    if (bSetAsBufferProp)
                    {
                        retVal = pValues->SetPropertyBuffer(pszName, pValue);
                    }
                    else
                    {
                        retVal = pValues->SetPropertyCString(pszName, pValue);
                    }
                }
                else
                {
                    retVal = HXR_OUTOFMEMORY;
                }
            }
        }
        HX_RELEASE(pValue);
    }

    return retVal;
}

HX_RESULT CreateNullTermBuffer(BYTE*  pBuf,
                               UINT32 ulLen,
                               char** ppNTBuf)
{
    HX_RESULT retVal = HXR_FAIL;

    if (pBuf && ulLen && ppNTBuf)
    {
        char* pTmp = new char [ulLen+1];
        if (pTmp)
        {
            // Copy pBuf into the new buf
            memcpy(pTmp, pBuf, ulLen); /* Flawfinder: ignore */
            // NULL-terminate the new buf
            pTmp[ulLen] = '\0';
            // Set the out parameter
            *ppNTBuf = pTmp;
            // Clear the return value
            retVal = HXR_OK;
        }
    }

    return retVal;
}

HX_RESULT SetBufferProperty(IHXValues* pValues,
                            const char* pszName,
                            BYTE*       pBuf,
                            UINT32      ulLen,
                            IUnknown*   pContext)
{
    HX_RESULT retVal = HXR_FAIL;

    if (pValues && pszName && pBuf && ulLen)
    {
        // Create value buffer
        IHXBuffer* pValue = NULL;
        retVal = CreateBuffer(pValue, pContext);
        if (SUCCEEDED(retVal))
        {
            // Set the buffer
            retVal = pValue->Set(pBuf, ulLen);
            if (SUCCEEDED(retVal))
            {
                // Set the property
                retVal = pValues->SetPropertyBuffer(pszName, pValue);
            }
        }
        HX_RELEASE(pValue);
    }

    return retVal;
}

HX_RESULT UnpackPropertyULONG32(IHXValues* pValues,
                                REF(BYTE*)  rpBuf,
                                BYTE*       pLimit,
                                IUnknown*   pContext)
{
    HX_RESULT retVal = HXR_FAIL;

    if (pValues && rpBuf && pLimit &&
        rpBuf < pLimit && rpBuf[0] == 'u')
    {
        // Skip the 'u' type character
        rpBuf++;
        // Save the beginning of the string
        const char* pszName = (const char*) rpBuf;
        // Search until we find either a NULL or 
        // the end of the buffer
        while (rpBuf < pLimit && *rpBuf != 0) ++rpBuf;
        // Did we get a NULL terminator?
        if (rpBuf < pLimit && *rpBuf == 0)
        {
            // We know now that pszName is a valid string
            //
            // Skip the NULL terminator
            ++rpBuf;
            // Now get the ULONG32
            if (rpBuf + 4 <= pLimit)
            {
                // Unpack in big-endian form
                UINT32 ulValue = ((rpBuf[0] << 24) & 0xFF000000) |
                                 ((rpBuf[1] << 16) & 0x00FF0000) |
                                 ((rpBuf[2] <<  8) & 0x0000FF00) |
                                 ( rpBuf[3]        & 0x000000FF);
                // Skip the ULONG32
                rpBuf += 4;
                // Set the property
                retVal = pValues->SetPropertyULONG32(pszName, ulValue);
            }
        }
    }

    return retVal;
}

HX_RESULT UnpackPropertyCString(IHXValues* pValues,
                                REF(BYTE*)  rpBuf,
                                BYTE*       pLimit,
                                IUnknown*   pContext)
{
    HX_RESULT retVal = HXR_FAIL;

    if (pValues && rpBuf && pLimit &&
        rpBuf < pLimit && rpBuf[0] == 'c')
    {
        // Skip the 'c' type character
        rpBuf++;