/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2006-2009 Sun Microsystems, Inc.
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*/
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package com.sun.opends.sdk.util;
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import static com.sun.opends.sdk.messages.Messages.*;
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import static com.sun.opends.sdk.util.Validator.*;
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import org.opends.sdk.ByteSequence;
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import org.opends.sdk.ByteString;
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import org.opends.sdk.ByteStringBuilder;
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/**
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* This class provides methods for performing base64 encoding and
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* decoding. Base64 is a mechanism for encoding binary data in ASCII
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* form by converting sets of three bytes with eight significant bits
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* each to sets of four bytes with six significant bits each.
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*/
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public final class Base64
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{
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/**
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* The set of characters that may be used in base64-encoded values.
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*/
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private static final char[] BASE64_ALPHABET =
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("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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+ "0123456789+/").toCharArray();
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/**
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* Prevent instance creation.
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*/
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private Base64()
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{
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// No implementation required.
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}
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/**
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* Encodes the provided data as a base64 string.
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*
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* @param bytes
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* The data to be encoded.
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* @return The base64 encoded representation of {@code bytes}.
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* @throws NullPointerException
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* If {@code bytes} was {@code null}.
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*/
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public static String encode(ByteSequence bytes)
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throws NullPointerException
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{
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ensureNotNull(bytes);
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StringBuilder buffer = new StringBuilder(4 * bytes.length() / 3);
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int pos = 0;
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int iterations = bytes.length() / 3;
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for (int i = 0; i < iterations; i++)
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{
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int value =
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((bytes.byteAt(pos++) & 0xFF) << 16)
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| ((bytes.byteAt(pos++) & 0xFF) << 8)
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| (bytes.byteAt(pos++) & 0xFF);
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buffer.append(BASE64_ALPHABET[(value >>> 18) & 0x3F]);
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buffer.append(BASE64_ALPHABET[(value >>> 12) & 0x3F]);
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buffer.append(BASE64_ALPHABET[(value >>> 6) & 0x3F]);
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buffer.append(BASE64_ALPHABET[value & 0x3F]);
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}
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switch (bytes.length() % 3)
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{
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case 1:
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buffer.append(BASE64_ALPHABET[(bytes.byteAt(pos) >>> 2) & 0x3F]);
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buffer.append(BASE64_ALPHABET[(bytes.byteAt(pos) << 4) & 0x3F]);
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buffer.append("==");
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break;
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case 2:
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int value =
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((bytes.byteAt(pos++) & 0xFF) << 8)
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| (bytes.byteAt(pos) & 0xFF);
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buffer.append(BASE64_ALPHABET[(value >>> 10) & 0x3F]);
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buffer.append(BASE64_ALPHABET[(value >>> 4) & 0x3F]);
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buffer.append(BASE64_ALPHABET[(value << 2) & 0x3F]);
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buffer.append("=");
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break;
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}
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return buffer.toString();
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}
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/**
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* Decodes the provided base64 encoded data.
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*
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* @param base64
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* The base64 encoded data.
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* @return The decoded data.
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* @throws LocalizedIllegalArgumentException
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* If a problem occurs while attempting to decode {@code
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* base64}.
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* @throws NullPointerException
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* If {@code base64} was {@code null}.
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*/
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public static ByteString decode(String base64)
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throws LocalizedIllegalArgumentException, NullPointerException
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{
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ensureNotNull(base64);
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// The encoded value must have length that is a multiple of four
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// bytes.
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int length = base64.length();
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if ((length % 4) != 0)
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{
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Message message = ERR_BASE64_DECODE_INVALID_LENGTH.get(base64);
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throw new LocalizedIllegalArgumentException(message);
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}
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ByteStringBuilder builder = new ByteStringBuilder(length);
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for (int i = 0; i < length; i += 4)
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{
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boolean append = true;
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int value = 0;
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for (int j = 0; j < 4; j++)
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{
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switch (base64.charAt(i + j))
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{
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case 'A':
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value <<= 6;
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break;
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case 'B':
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value = (value << 6) | 0x01;
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break;
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case 'C':
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value = (value << 6) | 0x02;
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break;
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case 'D':
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value = (value << 6) | 0x03;
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break;
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case 'E':
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value = (value << 6) | 0x04;
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break;
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case 'F':
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value = (value << 6) | 0x05;
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break;
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case 'G':
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value = (value << 6) | 0x06;
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break;
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case 'H':
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value = (value << 6) | 0x07;
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break;
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case 'I':
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value = (value << 6) | 0x08;
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break;
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case 'J':
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value = (value << 6) | 0x09;
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break;
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case 'K':
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value = (value << 6) | 0x0A;
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break;
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case 'L':
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value = (value << 6) | 0x0B;
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break;
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case 'M':
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value = (value << 6) | 0x0C;
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break;
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case 'N':
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value = (value << 6) | 0x0D;
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break;
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case 'O':
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value = (value << 6) | 0x0E;
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break;
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case 'P':
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value = (value << 6) | 0x0F;
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break;
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case 'Q':
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value = (value << 6) | 0x10;
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break;
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case 'R':
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value = (value << 6) | 0x11;
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break;
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case 'S':
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value = (value << 6) | 0x12;
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break;
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case 'T':
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value = (value << 6) | 0x13;
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break;
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case 'U':
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value = (value << 6) | 0x14;
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break;
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case 'V':
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value = (value << 6) | 0x15;
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break;
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case 'W':
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value = (value << 6) | 0x16;
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break;
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case 'X':
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value = (value << 6) | 0x17;
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break;
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case 'Y':
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value = (value << 6) | 0x18;
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break;
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case 'Z':
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value = (value << 6) | 0x19;
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break;
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case 'a':
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value = (value << 6) | 0x1A;
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break;
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case 'b':
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value = (value << 6) | 0x1B;
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break;
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case 'c':
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value = (value << 6) | 0x1C;
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break;
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case 'd':
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value = (value << 6) | 0x1D;
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break;
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case 'e':
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value = (value << 6) | 0x1E;
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break;
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case 'f':
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value = (value << 6) | 0x1F;
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break;
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case 'g':
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value = (value << 6) | 0x20;
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break;
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case 'h':
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value = (value << 6) | 0x21;
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break;
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case 'i':
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value = (value << 6) | 0x22;
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break;
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case 'j':
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value = (value << 6) | 0x23;
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break;
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case 'k':
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value = (value << 6) | 0x24;
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break;
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case 'l':
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value = (value << 6) | 0x25;
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break;
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case 'm':
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value = (value << 6) | 0x26;
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break;
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case 'n':
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value = (value << 6) | 0x27;
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break;
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case 'o':
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value = (value << 6) | 0x28;
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break;
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case 'p':
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value = (value << 6) | 0x29;
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break;
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case 'q':
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value = (value << 6) | 0x2A;
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break;
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case 'r':
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value = (value << 6) | 0x2B;
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break;
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case 's':
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value = (value << 6) | 0x2C;
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break;
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case 't':
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value = (value << 6) | 0x2D;
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break;
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case 'u':
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value = (value << 6) | 0x2E;
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break;
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case 'v':
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value = (value << 6) | 0x2F;
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break;
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case 'w':
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value = (value << 6) | 0x30;
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break;
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case 'x':
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value = (value << 6) | 0x31;
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break;
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case 'y':
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value = (value << 6) | 0x32;
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break;
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case 'z':
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value = (value << 6) | 0x33;
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break;
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case '0':
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value = (value << 6) | 0x34;
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break;
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case '1':
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value = (value << 6) | 0x35;
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break;
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case '2':
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value = (value << 6) | 0x36;
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break;
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case '3':
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value = (value << 6) | 0x37;
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break;
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case '4':
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value = (value << 6) | 0x38;
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break;
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case '5':
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value = (value << 6) | 0x39;
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break;
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case '6':
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value = (value << 6) | 0x3A;
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break;
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case '7':
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value = (value << 6) | 0x3B;
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break;
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case '8':
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value = (value << 6) | 0x3C;
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break;
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case '9':
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value = (value << 6) | 0x3D;
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break;
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case '+':
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value = (value << 6) | 0x3E;
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break;
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case '/':
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value = (value << 6) | 0x3F;
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break;
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case '=':
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append = false;
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switch (j)
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{
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case 2:
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builder.append((byte) ((value >>> 4) & 0xFF));
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break;
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case 3:
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builder.append((byte) ((value >>> 10) & 0xFF));
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builder.append((byte) ((value >>> 2) & 0xFF));
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break;
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}
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break;
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default:
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Message message =
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ERR_BASE64_DECODE_INVALID_CHARACTER.get(base64, base64
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.charAt(i + j));
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throw new LocalizedIllegalArgumentException(message);
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}
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if (!append)
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{
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break;
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}
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}
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if (append)
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{
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builder.append((byte) ((value >>> 16) & 0xFF));
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builder.append((byte) ((value >>> 8) & 0xFF));
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builder.append((byte) (value & 0xFF));
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}
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else
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{
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break;
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}
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}
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return builder.toByteString();
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}
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}
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