Base64.java — netty Source File

Source Code

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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:
 *
 *   https://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.
 */
/*
 * Written by Robert Harder and released to the public domain, as explained at
 * https://creativecommons.org/licenses/publicdomain
 */
package io.netty.handler.codec.base64;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.Unpooled;
import io.netty.util.ByteProcessor;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.PlatformDependent;

import java.nio.ByteOrder;

/**
 * Utility class for {@link ByteBuf} that encodes and decodes to and from
 * <a href="https://en.wikipedia.org/wiki/Base64">Base64</a> notation.
 * <p>
 * The encoding and decoding algorithm in this class has been derived from
 * <a href="http://iharder.sourceforge.net/current/java/base64/">Robert Harder's Public Domain
 * Base64 Encoder/Decoder</a>.
 */
public final class Base64 {

    /** Maximum line length (76) of Base64 output. */
    private static final int MAX_LINE_LENGTH = 76;

    /** The equals sign (=) as a byte. */
    private static final byte EQUALS_SIGN = (byte) '=';

    /** The new line character (\n) as a byte. */
    private static final byte NEW_LINE = (byte) '\n';

    private static final byte WHITE_SPACE_ENC = -5; // Indicates white space in encoding

    private static final byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in encoding

    private static byte[] alphabet(Base64Dialect dialect) {
        return ObjectUtil.checkNotNull(dialect, "dialect").alphabet;
    }

    private static byte[] decodabet(Base64Dialect dialect) {
        return ObjectUtil.checkNotNull(dialect, "dialect").decodabet;
    }
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