bool CCImage::_initWithJpgData(void * data, int nSize, bool bNeedDecode /*= false*/){    int nRandomBytes = 0;    if (bNeedDecode) nRandomBytes = RANDOM_BYTES;

    if (bNeedDecode)    {        data = (unsigned char *)data + nRandomBytes;        nSize = nSize - nRandomBytes;    }

    /* these are standard libjpeg structures for reading(decompression) */    struct jpeg_decompress_struct cinfo;    struct jpeg_error_mgr jerr;    /* libjpeg data structure for storing one row, that is, scanline of an image */    JSAMPROW row_pointer[1] = {0};    unsigned long location = 0;    unsigned int i = 0;

    bool bRet = false;    do     {        /* here we set up the standard libjpeg error handler */        cinfo.err = jpeg_std_error( &jerr );

        /* setup decompression process and source, then read JPEG header */        jpeg_create_decompress( &cinfo );

        jpeg_mem_src( &cinfo, (unsigned char *) data, nSize );

        /* reading the image header which contains image information */        jpeg_read_header( &cinfo, true );

        // we only support RGB or grayscale        if (cinfo.jpeg_color_space != JCS_RGB)        {            if (cinfo.jpeg_color_space == JCS_GRAYSCALE || cinfo.jpeg_color_space == JCS_YCbCr)            {                cinfo.out_color_space = JCS_RGB;            }        }        else        {            break;        }

        /* Start decompression jpeg here */        jpeg_start_decompress( &cinfo );

        /* init image info */        m_nWidth  = (short)(cinfo.image_width);        m_nHeight = (short)(cinfo.image_height);        m_bHasAlpha = false;        m_bPreMulti = false;        m_nBitsPerComponent = 8;        row_pointer[0] = new unsigned char[cinfo.output_width*cinfo.output_components];        CC_BREAK_IF(! row_pointer[0]);

        m_pData = new unsigned char[cinfo.output_width*cinfo.output_height*cinfo.output_components];        CC_BREAK_IF(! m_pData);

        /* now actually read the jpeg into the raw buffer */        /* read one scan line at a time */        while( cinfo.output_scanline < cinfo.image_height )        {            jpeg_read_scanlines( &cinfo, row_pointer, 1 );            for( i=0; i<cinfo.image_width*cinfo.output_components;i++)             {                m_pData[location++] = row_pointer[0][i];            }        }

        jpeg_finish_decompress( &cinfo );        jpeg_destroy_decompress( &cinfo );        /* wrap up decompression, destroy objects, free pointers and close open files */                bRet = true;    } while (0);

    CC_SAFE_DELETE_ARRAY(row_pointer[0]);    return bRet;}