gifvsrc.cpp

来自「symbian 下的helix player源代码」· C++ 代码 · 共 606 行 · 第 1/2 页

	return HXR_UNEXPECTED;
    }
    HX_RESULT ret = HXR_OK;

    if ( SUCCEEDED(status) )
    {
	HX_ASSERT(m_pViewSourceResponse != NULL);
	HX_ASSERT(m_pFileObject != NULL);
	m_ulFileSize = ulSize;
	m_ulModTime = ulModificationTime;
        // Now we read we only need the first 13 bytes -
	m_state = kStateReadPending;
        ret = m_pFileObject->Read(13);
    }
    else
    {
	m_state = kStateReady;
 	ret = m_pViewSourceResponse->SourceReady(status, NULL);
    }
    return ret;
}


/************************************************************************
 *  Method:
 *    IHXFileResponse::InitDone
 *  Purpose:
 *    Notification interface provided by users of the IHXFileObject
 *    interface. This method is called by the IHXFileObject when the
 *    initialization of the file is complete.
 */
STDMETHODIMP
CGIFViewSource::InitDone( HX_RESULT status )
{
    if ( m_state != kStateInitFilePending )
    {
	return HXR_UNEXPECTED;
    }
    HX_ASSERT(m_pViewSourceResponse != NULL);
    m_state = kStateReady;
    return m_pViewSourceResponse->InitDone(status);
}

/************************************************************************
 *  Method:
 *	IHXFileResponse::ReadDone
 *  Purpose:
 *	Notification interface provided by users of the IHXFileObject
 *	interface. This method is called by the IHXFileObject when the
 *	last read from the file is complete and a buffer is available.
 */
STDMETHODIMP
CGIFViewSource::ReadDone(HX_RESULT status, 
				       IHXBuffer* pBuffer)
{
    if ( m_state != kStateReadPending )
    {
	return HXR_UNEXPECTED;
    }

    HX_RESULT result = HXR_OK;
    HX_ASSERT(m_pViewSourceResponse != NULL);
    
    m_state = kStateReady;
    if ( SUCCEEDED(status) )
    {
        // Have we read all we were supposed to?
        if (pBuffer->GetSize() == 13)
        {
	    HX_RELEASE(m_pFileBuffer);
	    m_pFileBuffer = pBuffer;
	    m_pFileBuffer->AddRef();

	    IHXBuffer* pReturnBuffer = NULL;
	    result = CreateInfoBuffer(pReturnBuffer);
	    if ( SUCCEEDED(result) )
	    {
		result = m_pViewSourceResponse->SourceReady(HXR_OK, 
		    pReturnBuffer);
	    }
	    else
	    {
		//  don't like the File format 
		result = m_pViewSourceResponse->SourceReady(result, 
		    NULL);
	    }
	    HX_RELEASE(pReturnBuffer);
        }
        else
        {
	    result = m_pViewSourceResponse->SourceReady(HXR_FAIL,
		NULL);
        }
    }
    else
    {
	result = m_pViewSourceResponse->SourceReady(status, 
    	    NULL);
    }
    return result;
}

/************************************************************************
 *  Method:
 *	IHXFileResponse::WriteDone
 *  Purpose:
 *	Notification interface provided by users of the IHXFileObject
 *	interface. This method is called by the IHXFileObject when the
 *	last write to the file is complete.
 */
STDMETHODIMP
CGIFViewSource::WriteDone(HX_RESULT status)
{
    // We don't ever write, so we don't expect to get this...
    return HXR_UNEXPECTED;
}

/************************************************************************
 *  Method:
 *	IHXFileResponse::SeekDone
 *  Purpose:
 *	Notification interface provided by users of the IHXFileObject
 *	interface. This method is called by the IHXFileObject when the
 *	last seek in the file is complete.
 */
STDMETHODIMP
CGIFViewSource::SeekDone(HX_RESULT status)
{
    return HXR_UNEXPECTED;
}

/************************************************************************
 *  Method:
 *	IHXFileResponse::CloseDone
 *  Purpose:
 *	Notification interface provided by users of the IHXFileObject
 *	interface. This method is called by the IHXFileObject when the
 *	close of the file is complete.
 */
STDMETHODIMP
CGIFViewSource::CloseDone(HX_RESULT status)
{
    return HXR_OK;
}

/************************************************************************
 *  Method:
 *	CGIFViewSource::CreateInfoBuffer
 */
STDMETHODIMP 
CGIFViewSource::CreateInfoBuffer(REF(IHXBuffer*) pBuffer)
{
    char buf[128]; /* Flawfinder: ignore */

    CGIFCodec::LogicalScreenDescriptor lsd;
    HX_RESULT ret = ParseGif(lsd);
    if ( FAILED(ret) )
    {
	return ret;
    }

    CBigByteGrowingQueue queue(INITIAL_QUEUESIZE);
    queue.EnQueue(z_pOpen);
     
    sprintf(buf, z_pImage_ss, z_pGIFGif, z_pGIFGif); /* Flawfinder: ignore */
    queue.EnQueue(buf);
    queue.EnQueue(z_pImageType);
    if ( m_bIsGIF89a )
    {
	queue.EnQueue("GIF 89a Image");
    }
    else
    {
	queue.EnQueue("GIF 87a Image");
    }
    queue.EnQueue(z_pEndLine);
    
    queue.EnQueue(z_pFileName);
    const char* pFileName;
    m_pFileObject->GetFilename(pFileName);
    queue.EnQueue(pFileName);
    queue.EnQueue(z_pEndLine);
    
    QueueModificationTime(&queue, m_ulModTime);
    QueueFileSize(&queue, m_ulFileSize);
    
    sprintf(buf, z_pImageDimen_ii, lsd.m_ulLogicalScreenWidth, /* Flawfinder: ignore */
	lsd.m_ulLogicalScreenHeight);
    queue.EnQueue(buf);
    queue.EnQueue(z_pEndLine);

    sprintf(buf, z_pColorTableBits_i, lsd.m_ulColorTableBits); /* Flawfinder: ignore */
    queue.EnQueue(buf);
    queue.EnQueue(z_pEndLine);
    
    IHXBuffer* pRam = NULL;
    IHXBuffer* pCD = NULL;
    if (m_pViewSourceOptions &&
	SUCCEEDED(m_pViewSourceOptions->GetPropertyCString("RamGenURL",
	pRam)) && 
	SUCCEEDED(m_pViewSourceOptions->GetPropertyCString("CurrentPath",
	pCD)) )
    {
	queue.EnQueue(z_pRamLink);
	queue.EnQueue("<a href =\"");
	queue.EnQueue((const char*)pRam->GetBuffer());
	const char* p = (const char*)pCD->GetBuffer();
	if ( *p == '/' )
	{
	    p++;
	}
	queue.EnQueue(p);
	queue.EnQueue("/");
	const char* pFileName;
	m_pFileObject->GetFilename(pFileName);
	queue.EnQueue(pFileName);
	queue.EnQueue("\">");
	queue.EnQueue((const char*)pRam->GetBuffer());
	queue.EnQueue(p);
	queue.EnQueue("/");
	queue.EnQueue(pFileName);
	queue.EnQueue("</a>");
	queue.EnQueue(z_pEndLine);
    }
    HX_RELEASE(pRam);
    HX_RELEASE(pCD);

    queue.EnQueue((void*)z_pClose, strlen(z_pClose));
    HX_RELEASE(pBuffer);
    m_pCommonClassFactory->CreateInstance(IID_IHXBuffer, (void**)&pBuffer);
    if ( !pBuffer )
    {
	return HXR_OUTOFMEMORY;
    }
    if ( FAILED(pBuffer->SetSize(queue.GetQueuedItemCount())) )
    {
	HX_RELEASE(pBuffer);
	return HXR_OUTOFMEMORY;
    }
    unsigned char* chr = pBuffer->GetBuffer();
    queue.DeQueue(chr, queue.GetQueuedItemCount());
    return HXR_OK;
}

/************************************************************************
 *  Method:
 *	CGIFViewSource::ParseGif
 */
STDMETHODIMP
CGIFViewSource::ParseGif(REF(CGIFCodec::LogicalScreenDescriptor) lsd)
{
    HX_RESULT retVal = HXR_OK;

    if ( m_pFileBuffer )
    {
        // Get the buffer (this causes the initial gather)
        BYTE* pBuf = m_pFileBuffer->GetBuffer();
        if (pBuf)
        {
	    UINT32 ulBufSize = m_pFileBuffer->GetSize();
	    if ( ulBufSize < 13 )
	    {
		return HXR_FAIL;
	    }

	    BYTE  *pBufLimit = pBuf + ulBufSize;
	    /* Check the signature */
	    if (pBuf[0] != 'G' || pBuf[1] != 'I' || pBuf[2] != 'F')
	    {
		return HXR_FAIL;
	    }
	    pBuf += 3;

	    /* Check the version */
	    if (pBuf[0] == '8' && pBuf[1] == '9' && pBuf[2] == 'a')
	    {
		m_bIsGIF89a = TRUE;
	    }
	    else if (pBuf[0] == '8' && pBuf[1] == '7' && pBuf[2] == 'a')
	    {
		m_bIsGIF89a = FALSE;
	    }
	    else
	    {
		return HXR_FAIL;
	    }
	    pBuf += 3;

	    /* Get the logical screen descriptor */
	    CGIFCodec::ParseLogicalScreenDescriptor(pBuf, lsd);
        }
        else
        {
            retVal = HXR_FAIL;
        }
    }
    else
    {
        retVal = HXR_UNEXPECTED;
    }
    return retVal;
}