jpgsrc.h

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// $Id: jpgsrc.h 809 2006-04-13 11:28:42Z phil $
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 */
//

#ifndef INC_JPGSRC
#define INC_JPGSRC



/**************************************************************************************

>   class JPEGDataSource : public jpeg_source_mgr

    Author:     Colin_Barfoot (Xara Group Ltd) <camelotdev@xara.com>
    Created:    10/08/96
    Purpose:    Provides an overridden version of the IJG library source manager,
                using CCFile's.

**************************************************************************************/
class JPEGDataSource : public libJPEG::jpeg_source_mgr
{
    // Declare the class for memory tracking
//  CC_DECLARE_MEMDUMP(CCWobJob);

    BOOL        m_bStartOfFile;     // Do we have any data yet?
    CCFile*     m_pInputFile;       // source file
    libJPEG::JOCTET *m_pBuffer;         // start of read buffer

public:
    JPEGDataSource(CCFile* pInputFile);

    enum
    {
        INPUT_BUF_SIZE = 4096   /* choose an efficiently fread'able size */
    };

    libJPEG::boolean    InitBuffer(libJPEG::j_decompress_ptr cinfo);
    static void InitSource(libJPEG::j_decompress_ptr cinfo);
    static libJPEG::boolean FillInputBuffer(libJPEG::j_decompress_ptr cinfo);
    static void SkipInputData(libJPEG::j_decompress_ptr cinfo, long /*TYPENOTE: Correct*/ num_bytes);
    static void TerminateSource(libJPEG::j_decompress_ptr cinfo);
};


#endif  // INC_JPGSRC

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