Java InputStream Compare inputStreamEquals(InputStream is1, InputStream is2)

Description

input Stream Equals

License

Apache License

Declaration

public static boolean inputStreamEquals(InputStream is1, InputStream is2) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.InputStream;
import java.util.Arrays;

public class Main {
    private final static int BUFFSIZE = 1024;
    private static byte buff1[] = new byte[BUFFSIZE];
    private static byte buff2[] = new byte[BUFFSIZE];

    public static boolean inputStreamEquals(InputStream is1, InputStream is2) {
        if (is1 == is2)
            return true;
        if (is1 == null && is2 == null)
            return true;
        if (is1 == null || is2 == null)
            return false;
        try {//from  w  w w .j a  va2s  .  co  m
            int read1 = -1;
            int read2 = -1;

            do {
                int offset1 = 0;
                while (offset1 < BUFFSIZE
                        && (read1 = is1.read(buff1, offset1, BUFFSIZE
                                - offset1)) >= 0) {
                    offset1 += read1;
                }

                int offset2 = 0;
                while (offset2 < BUFFSIZE
                        && (read2 = is2.read(buff2, offset2, BUFFSIZE
                                - offset2)) >= 0) {
                    offset2 += read2;
                }
                if (offset1 != offset2)
                    return false;
                if (offset1 != BUFFSIZE) {
                    Arrays.fill(buff1, offset1, BUFFSIZE, (byte) 0);
                    Arrays.fill(buff2, offset2, BUFFSIZE, (byte) 0);
                }
                if (!Arrays.equals(buff1, buff2))
                    return false;
            } while (read1 >= 0 && read2 >= 0);
            if (read1 < 0 && read2 < 0)
                return true; // both at EOF
            return false;

        } catch (Exception ei) {
            return false;
        }
    }
}

Related

1. binaryStreamEquals(InputStream left, InputStream right)
2. binaryStreamEquals(InputStream left, InputStream right)