org.wildfly.common.codec.Base32Alphabet Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2017 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed 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.wildfly.common.codec;
import org.wildfly.common.iteration.ByteIterator;
import org.wildfly.common.iteration.CodePointIterator;
/**
* A base-32 alphabet.
*
* @see ByteIterator#base32Encode(Base32Alphabet)
* @see CodePointIterator#base32Decode(Base32Alphabet)
*/
public abstract class Base32Alphabet extends Alphabet {
/**
* Construct a new instance.
*
* @param littleEndian {@code true} if the alphabet is little-endian (LSB first), {@code false} otherwise
*/
protected Base32Alphabet(final boolean littleEndian) {
super(littleEndian);
}
/**
* Encode the given 5-bit value to a code point.
*
* @param val the 5-bit value
* @return the Unicode code point
*/
public abstract int encode(int val);
/**
* Decode the given code point. If the code point is not valid, -1 is returned.
*
* @param codePoint the code point
* @return the decoded 5-bit value or -1 if the code point is not valid
*/
public abstract int decode(int codePoint);
/**
* The standard RFC 4648 base-32 alphabet.
*/
public static final Base32Alphabet STANDARD = new Base32Alphabet(false) {
public int encode(final int val) {
if (val <= 25) {
return 'A' + val;
} else {
assert val < 32;
return '2' + val - 26;
}
}
public int decode(final int codePoint) {
if ('A' <= codePoint && codePoint <= 'Z') {
return codePoint - 'A';
} else if ('2' <= codePoint && codePoint <= '7') {
return codePoint - '2' + 26;
} else {
return -1;
}
}
};
/**
* The standard RFC 4648 base-32 alphabet mapped to lowercase.
*/
public static final Base32Alphabet LOWERCASE = new Base32Alphabet(false) {
public int encode(final int val) {
if (val <= 25) {
return 'a' + val;
} else {
assert val < 32;
return '2' + val - 26;
}
}
public int decode(final int codePoint) {
if ('a' <= codePoint && codePoint <= 'z') {
return codePoint - 'a';
} else if ('2' <= codePoint && codePoint <= '7') {
return codePoint - '2' + 26;
} else {
return -1;
}
}
};
}