int extract_pic_info(const BYTE *pic, const uint32_t size, int &width, int &height)

{

    int ret = -;

    width = ;

    height = ;

    size_t offset = ;

    if (pic == NULL)

        return ret;

    if ((pic[] == 'G') && (pic[] == 'I') && (pic[] == 'F') && (pic[] == '') && (pic[] == '' || '') && (pic[] == 'a'))

    {

        //gif

        offset = ;

        width = MAKEUS(pic[offset + ], pic[offset]);

        offset += ;

        height = MAKEUS(pic[offset + ], pic[offset]);

        ret = ;

        SS_DEBUG((LM_DEBUG, "extract_pic_info: gif width(%d) height(%d)!\n", width, height));

    } else if ((pic[] == 'B') && (pic[] == 'M'))

    {

        //BMP

        offset = ;

        width = MAKEUI(pic[offset + ], pic[offset + ], pic[offset + ], pic[offset + ]);

        offset += ;

        height = MAKEUS(pic[offset + ], pic[offset]);

        ret = ;

        SS_DEBUG((LM_DEBUG, "extract_pic_info: BMP width(%d) height(%d)!\n", width, height));

    } else if (pic[] == png_signature[] && pic[] == png_signature[] && pic[] == png_signature[]

            && pic[] == png_signature [] && pic[] == png_signature[]

            && pic[] == png_signature[] && pic[] == png_signature[] && pic[] == png_signature[])

    {

        //PNG

        offset = ;

        width = MAKEUI(pic[offset + ], pic[offset + ], pic[offset + ], pic[offset + ]);

        offset += ;

        height = MAKEUI(pic[offset + ], pic[offset + ], pic[offset + ], pic[offset + ]);

        ret = ;

        SS_DEBUG((LM_DEBUG, "extract_pic_info: PNG width(%d) height(%d)!\n", width, height));

    } else if (pic[] ==  && pic[] ==  && pic[size-] ==  && pic[size-] == )

    {

        //JPEG

        bool finish = false;

        offset = ;

        unsigned char id = ;

        while(!finish && offset < size)

        {

            if (pic[offset++] != 0xff || offset >= size)

            {

                ret = -;

                SS_DEBUG((LM_DEBUG, "extract_pic_info: JPEG format error!\n"));

                break;

            }

            id = pic[offset++];

            if (id >= M_APP0 && id <= M_APPF) // app data block

            {

                offset += MAKEUS(pic[offset], pic[offset + ]);

                continue;

            }

            switch(id)

            {

                case M_SOI:

                    break;

                case M_COM:

                case M_DQT:

                case M_DHT:

                case M_DNL:

                case M_DRI:

                    offset += MAKEUS(pic[offset], pic[offset + ]);

                    break;

                case M_SOF0:

                    offset += ;

                    height = MAKEUS(pic[offset], pic[offset + ]);

                    offset += ;

                    width = MAKEUS(pic[offset], pic[offset + ]);

                    finish = true;

                    ret = ;

                    SS_DEBUG((LM_DEBUG, "extract_pic_info: JPEG width(%d) height(%d)!\n", width, height));

                    break;

                case M_SOS:

                case M_EOI:

                case M_DATA:

                    finish = true;

                    ret = -;

                    SS_DEBUG((LM_DEBUG, "extract_pic_info: JPEG can't find SOF0!\n"));

                    break;

                default:

                    offset += MAKEUS(pic[offset], pic[offset + ]);

                    break;

            }

        }

    }

    return ret;

}