/*
* 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.
*/
package org.apache.harmony.archive.util;
/**
* Helpers for the archive module.
*/
public class Util {
/**
* Returns whether the given source string ends with the suffix, ignoring
* case and assuming that the strings are ascii encoded.
*
* @param source
* the string to match.
* @param suffix
* the suffix to test.
* @return {@code true} if the source does end with the given suffix, or
* {@code false} if not.
*/
public static boolean asciiEndsWithIgnoreCase(String source, String suffix) {
int length = suffix.length();
if (length > source.length()) {
return false;
}
int offset = source.length() - length;
for (int i = 0; i < length; i++) {
char c1 = source.charAt(i + offset);
char c2 = suffix.charAt(i);
if (c1 != c2 && toASCIIUpperCase(c1) != toASCIIUpperCase(c2)) {
return false;
}
}
return true;
}
/**
* 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;
}
}