java获取webp格式图片宽和高

public class DownTest {
    public static void main(String[] args)throws Exception {
        FileInputStream file =  new FileInputStream("E:\\20171102_cf36c03d56fbdf6214c3e5d196b90e21.webp");
        byte[] bytes = new byte[30];

        file.read(bytes,0,bytes.length);

       int width = ((int) bytes[27] & 0xff)<<8 | ((int) bytes[26] & 0xff);
       int height = ((int) bytes[29] & 0xff)<<8 | ((int) bytes[28] & 0xff);
        System.out.println(width);
        System.out.println(height);
    }
}

 获取文件头的27 28 位计算得到宽 29 30得到高

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