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comimgff.cpp：源码内容
							/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 
#include "hxcom.h"
#include "hxtypes.h"
#include "hxwintyp.h"
#include "hxcomm.h"
#include "ihxpckts.h"
#include "hxfiles.h"
#include "hxformt.h"
#include "hxplugn.h"
#include "hxver.h"
#include "baseobj.h"
#include "pckunpck.h"
#include "jpegdef.h"
#include "wbmphdr.h"
#include "unifimg.h"
#include "comimgff.h"
#include "comimgff.ver"
#include "hxheap.h"
#ifdef _DEBUG
#undef HX_THIS_FILE
static const char HX_THIS_FILE[] = __FILE__;
#endif
const char* const CCommonImageFileFormat::m_pszDescription       = "Helix Common Image File Format Plugin";
const char* const CCommonImageFileFormat::m_pszCopyright         = HXVER_COPYRIGHT;
const char* const CCommonImageFileFormat::m_pszMoreInfoURL       = HXVER_MOREINFO;
const char* const CCommonImageFileFormat::m_ppszFileMimeTypes[]  = {"image/jpeg", "image/png", "image/x-wap.wbmp", NULL};
const char* const CCommonImageFileFormat::m_ppszFileExtensions[] = {"jpg", "jpeg", "jpe", "jfif", "png",  "wbmp", NULL};
const char* const CCommonImageFileFormat::m_ppszFileOpenNames[]  = {"Images (*.jpg,*.png,*.wbmp)", NULL};
const char* const CCommonImageFileFormat::m_ppszStreamMimeType[] = {"image/jpeg", "image/png", "image/x-wap.wbmp", NULL};
CCommonImageFileFormat::CCommonImageFileFormat()
{
    m_lRefCount             = 0;
    m_pContext              = NULL;
    m_pFileObject           = NULL;
    m_pFormatResponse       = NULL;
    m_pCommonClassFactory   = NULL;
    m_pFileMimeMapper       = NULL;
    m_pURLStr               = NULL;
    m_pMimeTypeStr          = NULL;
    m_ulState               = kStateReady;
    m_ulFileOffset          = 0;
    m_ulDesiredFileOffset   = 0;
    m_ulRequestedFileOffset = 0;
    m_ulHeaderReadSize      = kInitialHeaderReadSize;
    m_bFileObjectOpen       = FALSE;
};
CCommonImageFileFormat::~CCommonImageFileFormat()
{
    if (m_pFileObject)
    {
        m_pFileObject->Close();
    }
    HX_RELEASE(m_pContext);
    HX_RELEASE(m_pFileObject);
    HX_RELEASE(m_pFormatResponse);
    HX_RELEASE(m_pCommonClassFactory);
    HX_RELEASE(m_pFileMimeMapper);
    HX_RELEASE(m_pURLStr);
    HX_RELEASE(m_pMimeTypeStr);
};
STDMETHODIMP CCommonImageFileFormat::QueryInterface(REFIID riid, void** ppvObj)
{
    HX_RESULT retVal = HXR_FAIL;
    if (ppvObj)
    {
        // Set defaults
        *ppvObj = NULL;
        retVal  = HXR_OK;
        // Switch on iid
        if (IsEqualIID(riid, IID_IUnknown))
        {
            AddRef();
            *ppvObj = (IUnknown*) (CHXBaseCountingObject*) (IHXPlugin*) this;
        }
        else if (IsEqualIID(riid, IID_IHXPlugin))
        {
            AddRef();
            *ppvObj = (IHXPlugin*) this;
        }
        else if (IsEqualIID(riid, IID_IHXFileFormatObject))
        {
            AddRef();
            *ppvObj = (IHXFileFormatObject*) this;
        }
        else if (IsEqualIID(riid, IID_IHXFileResponse))
        {
            AddRef();
            *ppvObj = (IHXFileResponse*) this;
        }
        else if (IsEqualIID(riid, IID_IHXFileMimeMapperResponse))
        {
            AddRef();
            *ppvObj = (IHXFileMimeMapperResponse*) this;
        }
        else
        {
            retVal = HXR_NOINTERFACE;
        }
    }
    return retVal;
}
STDMETHODIMP_(UINT32) CCommonImageFileFormat::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}
STDMETHODIMP_(UINT32) CCommonImageFileFormat::Release()
{
    if (InterlockedDecrement(&m_lRefCount) > 0)
    {
        return m_lRefCount;
    }
    delete this;
    return 0;
}
STDMETHODIMP CCommonImageFileFormat::GetPluginInfo(REF(BOOL)        rbLoadMultiple,
                                                   REF(const char*) rpszDescription,
                                                   REF(const char*) rpszCopyright,
                                                   REF(const char*) rpszMoreInfoURL,
                                                   REF(UINT32)      rulVersionNumber)
{
    rbLoadMultiple   = TRUE;
    rpszDescription  = (const char*) m_pszDescription;
    rpszCopyright    = (const char*) m_pszCopyright;
    rpszMoreInfoURL  = (const char*) m_pszMoreInfoURL;
    rulVersionNumber = TARVER_ULONG32_VERSION;
    return HXR_OK;
}
STDMETHODIMP CCommonImageFileFormat::InitPlugin(IUnknown* pContext)
{
    HX_RESULT retVal = HXR_FAIL;
    if (pContext)
    {
        // Save a copy of the calling context
        HX_RELEASE(m_pContext);
        m_pContext = pContext;
        m_pContext->AddRef();
        // Get an interface to the common class factory
        HX_RELEASE(m_pCommonClassFactory);
        retVal = m_pContext->QueryInterface(IID_IHXCommonClassFactory,
                                            (void**) &m_pCommonClassFactory);
    }
    return retVal;
}
STDMETHODIMP CCommonImageFileFormat::GetFileFormatInfo(REF(const char**) rppszFileMimeTypes,
                                                       REF(const char**) rppszFileExtensions,  
                                                       REF(const char**) rppszFileOpenNames)
{
    rppszFileMimeTypes  = (const char**) m_ppszFileMimeTypes;
    rppszFileExtensions = (const char**) m_ppszFileExtensions;
    rppszFileOpenNames  = (const char**) m_ppszFileOpenNames;
    return HXR_OK;
}
STDMETHODIMP CCommonImageFileFormat::InitFileFormat(IHXRequest*        pRequest, 
                                                    IHXFormatResponse* pFormatResponse,
                                                    IHXFileObject*     pFileObject)
{
    HX_RESULT retVal = HXR_FAIL;
    if (pRequest && pFormatResponse && pFileObject)
    {
        if (m_ulState == kStateReady)
        {
            // Save members
            HX_RELEASE(m_pFormatResponse);
            m_pFormatResponse = pFormatResponse;
            m_pFormatResponse->AddRef();
            HX_RELEASE(m_pFileObject);
            m_pFileObject = pFileObject;
            m_pFileObject->AddRef();
            // Get the URL from the request
            const char* pszURL = NULL;
            retVal = pRequest->GetURL(pszURL);
            if (SUCCEEDED(retVal))
            {
                // Save the URL
                HX_RELEASE(m_pURLStr);
                retVal = CreateStringBuffer(m_pURLStr, pszURL, m_pContext);
                if (SUCCEEDED(retVal))
                {
                    // Set the state
                    m_ulState = kStateIFFInitDonePending;
                    // Clear the return value
                    retVal = HXR_OK;
                    // Init the file object
                    m_pFileObject->Init(HX_FILE_READ | HX_FILE_BINARY, this);
                }
            }
        }
    }
    if (FAILED(retVal) && pFormatResponse)
    {
        pFormatResponse->InitDone(HXR_FAIL);
    }
    return retVal;
}
STDMETHODIMP CCommonImageFileFormat::GetFileHeader()
{
    HX_RESULT retVal = HXR_UNEXPECTED;
    if (m_ulState == kStateReady)
    {
        // Get an IHXValues object
        IHXValues* pHeader = NULL;
        retVal = m_pCommonClassFactory->CreateInstance(CLSID_IHXValues,
                                            (void**) &pHeader);
        if (SUCCEEDED(retVal))
        {
            // Set the stream count
            pHeader->SetPropertyULONG32("StreamCount", 1);
            // Call the response interface
            m_pFormatResponse->FileHeaderReady(HXR_OK, pHeader);
        }
        HX_RELEASE(pHeader);
    }
    if (FAILED(retVal) && m_pFormatResponse)
    {
        m_pFormatResponse->FileHeaderReady(retVal, NULL);
    }
    return retVal;
}
STDMETHODIMP CCommonImageFileFormat::GetStreamHeader(UINT16 usStreamNum)
{
    HX_RESULT retVal = HXR_UNEXPECTED;
    if (m_ulState == kStateReady)
    {
        // Clear the return value
        retVal = HXR_OK;
        // Init the seeked file offset
        m_ulRequestedFileOffset = 0;
        // Set the state
        m_ulState = kStateGSHSeekDonePending;
        // Seek the file object to the beginning
        m_pFileObject->Seek(m_ulRequestedFileOffset, FALSE);
    }
    if (FAILED(retVal) && m_pFormatResponse)
    {
        m_pFormatResponse->StreamHeaderReady(retVal, NULL);
    }
    return retVal;
}
STDMETHODIMP CCommonImageFileFormat::GetPacket(UINT16 usStreamNum)
{
    HX_RESULT retVal = HXR_UNEXPECTED;
    if (m_ulState == kStateReady && usStreamNum == 0)
    {
        // Clear the return value
        retVal = HXR_OK;
        // Are we already at the desired file offset?
        if (m_ulDesiredFileOffset == m_ulFileOffset)
        {
            // Set the state
            m_ulState = kStateGPReadDonePending;
            // Read kPacketSize bytes
            HX_RESULT res = m_pFileObject->Read(kPacketSize);
            if( HXR_FAIL == res) 
            {
                //All the data has been read.
                ReadDone(HXR_FAIL, NULL );
            }
        }
        else
        {
            // Set the state
            m_ulState = kStateGPSeekDonePending;
            // Save the value we are trying to seek to
            m_ulRequestedFileOffset = m_ulDesiredFileOffset;
            // Seek to the desired file offset
            m_pFileObject->Seek(m_ulRequestedFileOffset, FALSE);
        }
    }
    if (FAILED(retVal) && m_pFormatResponse)
    {
        m_pFormatResponse->StreamDone(0);
    }
    return retVal;
}
STDMETHODIMP CCommonImageFileFormat::Seek(UINT32 ulOffset)
{
    HX_RESULT retVal = HXR_UNEXPECTED;
    if (m_pFormatResponse)
    {
        // Clear the return value
        retVal = HXR_OK;
        // Set the desired file offset back to the beginning
        m_ulDesiredFileOffset = 0;
        // Is the file object currently open?
        if (m_bFileObjectOpen)
        {
            // The file object is still currently open,
            // so all we have to do is start reading
            // again back at the beginning of the file.
            //
            // Tell the response we're ready to start
            // giving packets again.
            m_pFormatResponse->SeekDone(HXR_OK);
        }
        else
        {
            // The file object has been closed. We need
            // to reopen it.
            //
            // Set the state
            m_ulState = kStateSeekInitDonePending;
            // Init the file object
            m_pFileObject->Init(HX_FILE_READ | HX_FILE_BINARY, this);
        }
    }
    return retVal;
}
STDMETHODIMP CCommonImageFileFormat::Close()
{
    HX_RESULT retVal = HXR_OK;
    if (m_pFileObject)
    {
        m_pFileObject->Close();
    }
    HX_RELEASE(m_pContext);
    HX_RELEASE(m_pFileObject);
    HX_RELEASE(m_pFormatResponse);
    HX_RELEASE(m_pCommonClassFactory);
    HX_RELEASE(m_pFileMimeMapper);
    HX_RELEASE(m_pURLStr);
    HX_RELEASE(m_pMimeTypeStr);
    m_ulState               = kStateReady;
    m_ulFileOffset          = 0;
    m_ulDesiredFileOffset   = 0;
    m_ulRequestedFileOffset = 0;
    return retVal;
}
STDMETHODIMP CCommonImageFileFormat::InitDone(HX_RESULT status)
{
    HX_RESULT retVal = HXR_UNEXPECTED;
    if (m_ulState == kStateIFFInitDonePending)
    {
        // Clear the return value
        retVal = HXR_OK;
        // Did the init succeed?
        if (SUCCEEDED(status))
        {
            // Set the flag saying the file is open
            m_bFileObjectOpen = TRUE;
            // Try and get the IHXFileMimeMapper interface
            HX_RELEASE(m_pFileMimeMapper);
            m_pFileObject->QueryInterface(IID_IHXFileMimeMapper, (void**) &m_pFileMimeMapper);
            if (m_pFileMimeMapper)
            {
                // We got the IHXFileMimeMapper interface,
                // so get our own IHXFileMimeMapperResponse interface
                IHXFileMimeMapperResponse* pResponse = NULL;
                QueryInterface(IID_IHXFileMimeMapperResponse, (void**) &pResponse);
                // Set the state
                m_ulState = kStateIFFMimeTypeFoundPending;
                // Get the mime type
                m_pFileMimeMapper->FindMimeType((const char*) m_pURLStr->GetBuffer(), pResponse);
                // Now we can release our response interface
                HX_RELEASE(pResponse);
            }
            else
            {
                // We didn't get an IHXFileMimeMapper interface,
                // but that's not a reason to fail
                //
                // Set state
                m_ulState = kStateReady;
                // Call back to response interface
                m_pFormatResponse->InitDone(status);
            }
        }
        else
        {
            // Set the state
            m_ulState = kStateIFFCloseDonePending;
            // Close the file
            m_pFileObject->Close();
        }
    }
    else if (m_ulState == kStateSeekInitDonePending)
    {
        // Clear the return value
        retVal = HXR_OK;
        // Set the state
        m_ulState = kStateReady;
        // Did the init succeed?
        if (SUCCEEDED(status))
        {
            // Set the flag saying the file is open
            m_bFileObjectOpen = TRUE;
        }
        // Tell the response interface whether
        // or not the seek succeeded
        m_pFormatResponse->SeekDone(status);
    }
    return retVal;
}
STDMETHODIMP CCommonImageFileFormat::ReadDone(HX_RESULT status, IHXBuffer* pBuffer)
{
    HX_RESULT retVal = HXR_UNEXPECTED;
    if (m_ulState == kStateGSHReadDonePending)
    {
        retVal = status;
        if (SUCCEEDED(retVal))
        {
            // Update the file offset
            m_ulFileOffset += pBuffer->GetSize();
            // Determine if this is a WBMP file based on the mime
            // type and the URL. We need to know this because WBMP
            // does not have any kind of identifying magic number
            // at the beginning of the file
            BOOL bIsWBMP = IsWBMP(m_pMimeTypeStr, m_pURLStr);
            // Determine width and height
            UINT32 ulWidth     = 0;
            UINT32 ulHeight    = 0;
            UINT32 ulImageType = 0;
            retVal = ParseWidthHeight(pBuffer, bIsWBMP, ulWidth, ulHeight, ulImageType);
            if (SUCCEEDED(retVal))
            {
                // Create a stream header
                IHXValues* pValues = NULL;
                retVal = m_pCommonClassFactory->CreateInstance(CLSID_IHXValues, (void**) &pValues);
                if (SUCCEEDED(retVal))
                {
                    // Set the mime type
                    SetCStringProperty(pValues,
                                       "MimeType",
                                       m_ppszStreamMimeType[ulImageType],
                                       m_pContext);
                    // Set the intrinsic duration property
                    SetCStringProperty(pValues,
                                       "intrinsicDurationType",
                                       "intrinsicDurationDiscrete",
                                       m_pContext);
                    // Set the ASM rulebook
                    SetCStringProperty(pValues,
                                       "ASMRuleBook",
                                       "AverageBandwidth=12000,Priority=5;",
                                       m_pContext);
                    // Set some ULONG32 properties
                    pValues->SetPropertyULONG32("StreamNumber",     0);
                    pValues->SetPropertyULONG32("MaxBitRate",       kBitrate);
                    pValues->SetPropertyULONG32("AvgBitRate",       kBitrate);
                    pValues->SetPropertyULONG32("MaxPacketSize",    kPacketSize);
                    pValues->SetPropertyULONG32("AvgPacketSize",    kPacketSize);
                    pValues->SetPropertyULONG32("StartTime",        0);
                    pValues->SetPropertyULONG32("PreRoll",          kPreroll);
                    pValues->SetPropertyULONG32("Duration",         kDuration);
                    pValues->SetPropertyULONG32("ContentVersion",   0);
                    pValues->SetPropertyULONG32("StreamVersion",    0);
                    pValues->SetPropertyULONG32("ImageWidth",       ulWidth);
                    pValues->SetPropertyULONG32("ImageHeight",      ulHeight);
                    // Set the state
                    m_ulState = kStateReady;
                    // Set the desired offset
                    m_ulDesiredFileOffset = 0;
                    // Send the stream header
                    m_pFormatResponse->StreamHeaderReady(HXR_OK, pValues);
                }
                HX_RELEASE(pValues);
            }
            else
            {
                // We failed to find a supported image signature in the
                // amount of header of header we read. This may not be
                // a JPEG, PNG, or WBMP; or we just may not have read enough.
                // Sometimes JPEGs have lots of unnecessary header information
                // at the beginning of the file left there by Photoshop or
                // other image-editing tools. We will keep increasing the 
                // header size that we read until we have read the entire
                // file. At that point, we will fail. We know we are not yet
                // reading the entire file when our buffer size matches
                // the header read size
                if (pBuffer->GetSize() == m_ulHeaderReadSize)
                {
                    // We will assume we just haven't read enough bytes
                    // at the beginning of the file, so double the header
                    // read size
                    m_ulHeaderReadSize = (m_ulHeaderReadSize << 1);
                    // Clear the return value
                    retVal = HXR_OK;
                    // Init the seeked file offset
                    m_ulRequestedFileOffset = 0;
                    // Set the state
                    m_ulState = kStateGSHSeekDonePending;
                    // Seek the file object to the beginning
                    m_pFileObject->Seek(m_ulRequestedFileOffset, FALSE);
                }
            }
        }
        if (FAILED(retVal))
        {
            // Set the state
            m_ulState = kStateGSHCloseDonePending;
            // Close the file
            m_pFileObject->Close();
        }
    }
    else if (m_ulState == kStateGPReadDonePending)
    {
        // Copy the read status
        retVal = status;
        // Did the read succeed?
        if (SUCCEEDED(retVal))
        {
            // Update the file offset
            m_ulFileOffset += pBuffer->GetSize();
            // Create a packet
            IHXPacket* pPacket = NULL;
            retVal = m_pCommonClassFactory->CreateInstance(CLSID_IHXPacket, (void**) &pPacket);
            if (SUCCEEDED(retVal))
            {
                // Set the packet
                retVal = pPacket->Set(pBuffer,           // data
                                      0,                 // time stamp
                                      0,                 // stream 0
                                      HX_ASM_SWITCH_ON,  // ASM flag
                                      0);                // ASM rule
                if (SUCCEEDED(retVal))
                {
                    // Update the desired file offset
                    m_ulDesiredFileOffset = m_ulFileOffset;
                    // Set the state
                    m_ulState = kStateReady;
                    // Return the packet
                    m_pFormatResponse->PacketReady(HXR_OK, pPacket);
                }
            }
            HX_RELEASE(pPacket);
        }
        if (FAILED(retVal))
        {
            // Clear the return value
            retVal = HXR_OK;
            // Set the state
            m_ulState = kStateGPCloseDonePending;
            // Close the file
            m_pFileObject->Close();
        }
    }
    return retVal;
}
STDMETHODIMP CCommonImageFileFormat::SeekDone(HX_RESULT status)
{
    HX_RESULT retVal = HXR_UNEXPECTED;
    if (m_ulState == kStateGSHSeekDonePending)
    {
        // Clear the return value
        retVal = HXR_OK;
        // Did the seek succeed?
        if (SUCCEEDED(status))
        {
            // Assign the actual file offset
            m_ulFileOffset = m_ulRequestedFileOffset;
            // Set the state
            m_ulState = kStateGSHReadDonePending;
            // Read the header
            m_pFileObject->Read(m_ulHeaderReadSize);
        }
        else
        {
            // Set the state
            m_ulState = kStateGSHCloseDonePending;
            // Close the file
            m_pFileObject->Close();
        }
    }
    else if (m_ulState == kStateGPSeekDonePending)
    {
        // Clear the return value
        retVal = HXR_OK;
        // Did the seek succeed?
        if (SUCCEEDED(status))
        {
            // Set the actual file offset
            m_ulFileOffset = m_ulRequestedFileOffset;
            // Set the state
            m_ulState = kStateGPReadDonePending;
            // Read kPacketSize bytes
            m_pFileObject->Read(kPacketSize);
        }
        else
        {
            // Set the state
            m_ulState = kStateGPCloseDonePending;
            // Close the file
            m_pFileObject->Close();
        }
    }
    return retVal;
}
STDMETHODIMP CCommonImageFileFormat::CloseDone(HX_RESULT status)
{
    HX_RESULT retVal = HXR_UNEXPECTED;
    // Clear the file open flag
    m_bFileObjectOpen = FALSE;
    if (m_ulState == kStateIFFCloseDonePending)
    {
        // Clear the return value
        retVal = HXR_OK;
        // Set the state
        m_ulState = kStateReady;
        // Report failure to the response interface
        m_pFormatResponse->InitDone(HXR_FAIL);
    }
    else if (m_ulState == kStateGSHCloseDonePending)
    {
        // Clear the return value
        retVal = HXR_OK;
        // Set the state
        m_ulState = kStateReady;
        // Report failure to the response interface
        m_pFormatResponse->StreamHeaderReady(HXR_FAIL, NULL);
    }
    else if (m_ulState == kStateGPCloseDonePending)
    {
        // Clear the return value
        retVal = HXR_OK;
        // Set the state
        m_ulState = kStateReady;
        // Terminate the stream
        m_pFormatResponse->StreamDone(0);
    }
    return retVal;
}
STDMETHODIMP CCommonImageFileFormat::WriteDone(HX_RESULT status)
{
    // We don't ever write, so we don't expect to get this...
    return HXR_UNEXPECTED;
}
STDMETHODIMP CCommonImageFileFormat::MimeTypeFound(HX_RESULT status, const char* pMimeType)
{
    HX_RESULT retVal = HXR_UNEXPECTED;
    if (m_ulState == kStateIFFMimeTypeFoundPending)
    {
        // If we succeeded, then save the mime type.
        // However, even if we fail, then just go on.
        if (SUCCEEDED(status))
        {
            HX_RELEASE(m_pMimeTypeStr);
            CreateStringBuffer(m_pMimeTypeStr, pMimeType, m_pContext);
        }
        // Clear the return value
        retVal = HXR_OK;
        // Set the state
        m_ulState = kStateReady;
        // Call back to the response interface
        m_pFormatResponse->InitDone(HXR_OK);
    }
    if (FAILED(retVal) && m_pFormatResponse)
    {
        m_pFormatResponse->InitDone(retVal);
    }
    return retVal;
}
HX_RESULT STDAPICALLTYPE CCommonImageFileFormat::HXCreateInstance(IUnknown** ppIUnknown)
{
    HX_RESULT retVal = HXR_FAIL;
    if (ppIUnknown)
    {
        // Set default
        *ppIUnknown = NULL;
        // Create the object
        CCommonImageFileFormat *pObj = new CCommonImageFileFormat();
        if (pObj)
        {
            // QI for IUnknown
            retVal = pObj->QueryInterface(IID_IUnknown, (void**) ppIUnknown);
        }
        if (FAILED(retVal))
        {
            HX_DELETE(pObj);
        }
    }
    return retVal;
}
BOOL CCommonImageFileFormat::_GetNextJPGMarker( BYTE** pBuf,
                                                BYTE* pBufEnd,
                                                BYTE* ucMarkerType )
{
    BOOL  bRetVal = FALSE;
    BYTE* pPtr    = *pBuf;
    UINT  unSize  = 0;
    
    // JPEG segment layout:
    // byte  value
    //  1    0xFF(JPEG_MARKER_FLAG)
    //  2    segment type (marker type)
    //  3    MSB segment size. Size does not include bytes 1 & 2.
    //  4    LSB segment size. Size does not include bytes 1 & 2.
    // 5..n  segment data.
    
    //If we are called pointing to the start of a segment, then we get
    //the size and skip to the end of the segment before scanning for
    //the next marker.
    if( pBufEnd-pPtr >= 2 && *pPtr==JPEG_MARKER_FLAG )
    {
        unSize = 0;
        if( _HasSize(*(pPtr+1)) && pBufEnd-pPtr>=4 )
        {
            unSize = (*(pPtr+2)<<8)|*(pPtr+3);
        }
        pPtr += unSize+2; //first 2 segment bytes not included.
        
    }
    
    //Scan for the next JPEG_MARKER_FLAG
    while(pPtr<pBufEnd && JPEG_MARKER_FLAG!=*pPtr)
        pPtr++;
    //Did we find a marker and have at least 4 bytes for the header?
    if( pBufEnd-pPtr>=4 && JPEG_MARKER_FLAG==*pPtr )
    {
        *ucMarkerType = *(pPtr+1);
        *pBuf = pPtr;
        bRetVal = TRUE;
    }
    return bRetVal;
}
BOOL CCommonImageFileFormat::_ParseJPGSOFSegment( BYTE* pBuf,
                                                  BYTE* pBufEnd,
                                                  UINT32& ulWidth,
                                                  UINT32& ulHeight )
{
    // JPEG SOF0, SOF1, SOF2 segments....
    // byte1:  0xFF(JPEG_MARKER_FLAG)
    // byte2:  SOF marker tag
    // byte3:  MSB segment size
    // byte4:  LSB segment size
    //         Size does not include byte1 or byte2
    // byte5:  percision, bits/pixel
    // byte6:  MSB image height
    // byte7:  LSB image height
    // byte8:  MSB image width
    // byte9:  LSB image width
    BOOL bRetVal = FALSE;
    if( pBufEnd-pBuf>=9 )
    {
        ulHeight = (pBuf[5] << 8) | pBuf[6];
        ulWidth  = (pBuf[7] << 8) | pBuf[8];
        bRetVal  = HXR_OK;
    }
    return bRetVal;
}
BOOL CCommonImageFileFormat::_HasSize( BYTE marker )
{
    BOOL bRet = TRUE;
    switch(marker)
    {
       case JPEG_MARKER_RST0: //fall through
       case JPEG_MARKER_RST1: //fall through
       case JPEG_MARKER_RST2: //fall through
       case JPEG_MARKER_RST3: //fall through
       case JPEG_MARKER_RST4: //fall through
       case JPEG_MARKER_RST5: //fall through
       case JPEG_MARKER_RST6: //fall through
       case JPEG_MARKER_RST7: //fall through
       case JPEG_MARKER_TEM:  //fall through
       case JPEG_MARKER_SOI:  //fall through
       case JPEG_MARKER_EOI:
        bRet = FALSE;
        break;
    };
    return bRet;
}
BOOL CCommonImageFileFormat::_IsJPEG( BYTE* pBuf, BYTE* pBufEnd )
{
    BOOL bRetVal = FALSE;
    if( pBufEnd-pBuf >=2 )
    {
        if( JPEG_MARKER_FLAG==pBuf[0] && JPEG_MARKER_SOI==pBuf[1] )
            bRetVal = TRUE;
    }
    return bRetVal;
}
HX_RESULT CCommonImageFileFormat::ParseWidthHeight(IHXBuffer* pBuffer,
                                                   BOOL bIsWBMP,
                                                   REF(UINT32) rulWidth,
                                                   REF(UINT32) rulHeight,
                                                   REF(UINT32) rulImageType)
{
    HX_RESULT retVal = HXR_FAIL;
    
    if (pBuffer)
    {
        // Set the parsing variables
        BYTE* pBuf      = pBuffer->GetBuffer();
        BYTE* pBufLimit = pBuf + pBuffer->GetSize();
        // Do we already know this is WBMP?
        if (bIsWBMP)
        {
            // Parse the WBMP header
            UINT32 ulTmp = 0;
            retVal = ParseWBMPHeader(pBuf,
                                     pBuffer->GetSize(),
                                     rulWidth,
                                     rulHeight,
                                     ulTmp);
            if (SUCCEEDED(retVal))
            {
                // Set the image type
                rulImageType = UNIF_IMAGETYPE_WBMP;
            }
        }
        else
        {
            // This is not WBMP, so check for JPEG, GIF, and PNG
            //
            // Test for JPEG
            BYTE  ucMarkerType = 0;
            BOOL  bExit        = FALSE;
            if( _IsJPEG(pBuf, pBufLimit) )
            {
                // Set the image type
                rulImageType = UNIF_IMAGETYPE_JPEG;
                
                //Start searching for the SOF* 
                while( !bExit && _GetNextJPGMarker(&pBuf, pBufLimit, &ucMarkerType) )
                {
                    switch(ucMarkerType)
                    {
                       case JPEG_MARKER_SOF0: //fall through
                       case JPEG_MARKER_SOF1: //fall through
                       case JPEG_MARKER_SOF2:
                           retVal = _ParseJPGSOFSegment(pBuf, pBufLimit, rulWidth, rulHeight);
                           bExit = TRUE;
                           break;
                       case JPEG_MARKER_EOI:
                           //If we find the end of image marker its too late.
                           retVal = HXR_FAIL;
                           bExit  = TRUE;
                           break;
                       default:
                           break;
                    }
                }
            }
// Uncomment this if we support GIF in the
// future. For now, do GIF with GIF plugins (not unified)
#if 0
            else if (pBuf + 10 <= pBufLimit &&
                     pBuf[0] == 'G' && pBuf[1] == 'I' &&
                     pBuf[2] == 'F' && pBuf[3] == '8' &&
                     (pBuf[4] == '7' || pBuf[4] == '9') &&
                     pBuf[5] == 'a')
            {
                // Set the image type to GIF
                rulImageType = UNIF_IMAGETYPE_GIF;
                // Parse for width and height
                rulWidth  = (pBuf[7] << 8) | pBuf[6];
                rulHeight = (pBuf[9] << 8) | pBuf[8];
                // Clear the return value
                retVal = HXR_OK;
            }
#endif
            else if (pBuf + 8 <= pBufLimit &&
                     pBuf[0] == 0x89 && pBuf[1] == 0x50 &&
                     pBuf[2] == 0x4e && pBuf[3] == 0x47 &&
                     pBuf[4] == 0x0d && pBuf[5] == 0x0a &&
                     pBuf[6] == 0x1a && pBuf[7] == 0x0a)
            {
                // Set the image type to PNG
                rulImageType = UNIF_IMAGETYPE_PNG;
                // Skip the PNG signature
                pBuf += 8;
                // Scan for IHDR chunk, which should be first
                if (pBuf + 16 <= pBufLimit &&
                    pBuf[4] == 'I' && pBuf[5] == 'H' &&
                    pBuf[6] == 'D' && pBuf[7] == 'R')
                {
                    // Get the width and height
                    rulWidth   = (pBuf[8]  << 24) |
                        (pBuf[9]  << 16) |
                        (pBuf[10] <<  8) |
                        (pBuf[11]);
                    rulHeight  = (pBuf[12] << 24) |
                        (pBuf[13] << 16) |
                        (pBuf[14] <<  8) |
                        (pBuf[15]);
                    retVal = HXR_OK;
                }
            }
        }
    }
    return retVal;
}
BOOL CCommonImageFileFormat::IsWBMP(IHXBuffer* pMimeTypeStr, IHXBuffer* pURLStr)
{
    BOOL bRet = FALSE;
    // Check the mime type first (if we have it)
    if (pMimeTypeStr)
    {
        const char* pszMimeType = (const char*) pMimeTypeStr->GetBuffer();
        if (pszMimeType && !strcmp(pszMimeType, "image/x-wap.wbmp"))
        {
            // This *is* a WBMP file
            bRet = TRUE;
        }
    }
    if (!bRet && pURLStr)
    {
        // Do a quick-and-dirty check for the extension
        const char* pszURL = (const char*) pURLStr->GetBuffer();
        if (pszURL)
        {
            char* pszDot = strrchr(pszURL, '.');
            if (pszDot && strlen(pszDot) >= 5)
            {
                char* pszExt = pszDot + 1;
                if (!strncmp(pszExt, "wbmp", 4))
                {
                    bRet = TRUE;
                }
            }
        }
    }
    return bRet;
}

						