Java ASCII asciiEqualsIgnoreCase(byte[] buf1, byte[] buf2)

Description

Compares the given byte arrays and returns whether they are equal, ignoring case differences and assuming they are ascii-encoded strings.

License

Apache License

Parameter

Parameter	Description
buf1	first byte array to compare.
buf2	second byte array to compare.

Return

the result of the comparison.

Declaration

public static boolean asciiEqualsIgnoreCase(byte[] buf1, byte[] buf2) 

Method Source Code

//package com.java2s;
/*//from   w  ww  .ja  v  a 2 s  .com
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    /**
     * Compares the given byte arrays and returns whether they are equal,
     * ignoring case differences and assuming they are ascii-encoded strings.
     *
     * @param buf1
     *            first byte array to compare.
     * @param buf2
     *            second byte array to compare.
     * @return the result of the comparison.
     */
    public static boolean asciiEqualsIgnoreCase(byte[] buf1, byte[] buf2) {
        if (buf1 == null || buf2 == null) {
            return false;
        }
        if (buf1 == buf2) {
            return true;
        }
        if (buf1.length != buf2.length) {
            return false;
        }

        for (int i = 0; i < buf1.length; i++) {
            byte b1 = buf1[i];
            byte b2 = buf2[i];
            if (b1 != b2 && toASCIIUpperCase(b1) != toASCIIUpperCase(b2)) {
                return false;
            }
        }
        return true;
    }

    /**
     * Compares the given strings and returns whether they are equal, ignoring
     * case differences and assuming they are ascii-encoded strings.
     *
     * @param s1
     *            first string to compare.
     * @param s2
     *            second string to compare.
     * @return the result of the comparison.
     */
    public static boolean asciiEqualsIgnoreCase(String s1, String s2) {
        if (s1 == null || s2 == null) {
            return false;
        }
        if (s1 == s2) {
            return true;
        }

        int length = s1.length();
        if (length != s2.length()) {
            return false;
        }

        for (int i = 0; i < length; i++) {
            char c1 = s1.charAt(i);
            char c2 = s2.charAt(i);
            if (c1 != c2 && toASCIIUpperCase(c1) != toASCIIUpperCase(c2)) {
                return false;
            }
        }
        return true;
    }

    private static final byte toASCIIUpperCase(byte b) {
        if ('a' <= b && b <= 'z') {
            return (byte) (b - ('a' - 'A'));
        }
        return b;
    }

    private static final char toASCIIUpperCase(char c) {
        if ('a' <= c && c <= 'z') {
            return (char) (c - ('a' - 'A'));
        }
        return c;
    }
}

Related

1. asciiCharToBytes(char[] chars)
2. asciiDump(byte[] in)
3. asciiEbcdic(String source)
4. asciiEndsWithIgnoreCase(String source, String suffix)
5. asciiEqualsIgnoreCase(byte[] a, byte[] b)
6. asciiFill2(String str, int startIdx, String fillStr)
7. asciify(String s)
8. asciiIdx2StrIdx(String str, int asciiIdx)
9. asciiLength(String str)