MjpgUtil.java

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.LinkedList;
import java.util.List;

public class MjpgUtil {

    public static int trataHeader(InputStream in) throws IOException {
        // --myboundary\r\n
        // Content-Type: image/jpeg\r\n
        // Content-Length: 37459\r\n\r\n
        byte buf1[] = new byte[1];
        int four = 0;
        List<Byte> bytes = new LinkedList<Byte>();
        while (four < 4) {
            in.read(buf1);
            if (buf1[0] == 13 || buf1[0] == 10) {
                four++;
            } else {
                four = 0;
                bytes.add(buf1[0]);
            }
        }
        byte bts[] = new byte[bytes.size()];
        int i = bts.length;
        while (i-- > 0) {
            bts[i] = bytes.get(i);
        }
        String header = new String(bts);
        header = header.replaceFirst(".*Content-Length: (\\d+).*", "$1");
//      System.out.println(header);
        return Integer.parseInt(header);
    }

    public static byte[] trataImagem(int len, InputStream in) throws Exception {
        try (ByteArrayOutputStream out = new ByteArrayOutputStream(len)) {
            byte buf[] = new byte[len];
            int i = -1;
            int tot = 0;
            while (tot < len && (i = in.read(buf)) > -1) {
                tot += i;
                out.write(buf, 0, i);
            }
            return out.toByteArray();
        }
    }
}