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472 lines
22 KiB
Java
472 lines
22 KiB
Java
// Mozilla has modified this file - see http://hg.mozilla.org/ for details.
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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.mozilla.apache.commons.codec.binary;
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/**
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* Provides Base32 encoding and decoding as defined by <a href="http://www.ietf.org/rfc/rfc4648.txt">RFC 4648</a>.
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*
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* <p>
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* The class can be parameterized in the following manner with various constructors:
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* <ul>
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* <li>Whether to use the "base32hex" variant instead of the default "base32"</li>
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* <li>Line length: Default 76. Line length that aren't multiples of 8 will still essentially end up being multiples of
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* 8 in the encoded data.
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* <li>Line separator: Default is CRLF ("\r\n")</li>
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* </ul>
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* </p>
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* <p>
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* This class operates directly on byte streams, and not character streams.
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* </p>
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* <p>
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* This class is not thread-safe. Each thread should use its own instance.
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* </p>
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*
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* @see <a href="http://www.ietf.org/rfc/rfc4648.txt">RFC 4648</a>
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*
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* @since 1.5
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* @version $Revision: 1080712 $
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*/
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public class Base32 extends BaseNCodec {
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/**
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* BASE32 characters are 5 bits in length.
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* They are formed by taking a block of five octets to form a 40-bit string,
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* which is converted into eight BASE32 characters.
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*/
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private static final int BITS_PER_ENCODED_BYTE = 5;
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private static final int BYTES_PER_ENCODED_BLOCK = 8;
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private static final int BYTES_PER_UNENCODED_BLOCK = 5;
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/**
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* Chunk separator per RFC 2045 section 2.1.
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*
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* @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 2.1</a>
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*/
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private static final byte[] CHUNK_SEPARATOR = {'\r', '\n'};
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/**
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* This array is a lookup table that translates Unicode characters drawn from the "Base32 Alphabet" (as specified in
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* Table 3 of RFC 2045) into their 5-bit positive integer equivalents. Characters that are not in the Base32
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* alphabet but fall within the bounds of the array are translated to -1.
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*
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*/
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private static final byte[] DECODE_TABLE = {
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// 0 1 2 3 4 5 6 7 8 9 A B C D E F
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 00-0f
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 10-1f
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 63, // 20-2f
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-1, -1, 26, 27, 28, 29, 30, 31, -1, -1, -1, -1, -1, -1, -1, -1, // 30-3f 2-7
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-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, // 40-4f A-N
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // 50-5a O-Z
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};
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/**
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* This array is a lookup table that translates 5-bit positive integer index values into their "Base32 Alphabet"
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* equivalents as specified in Table 3 of RFC 2045.
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*/
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private static final byte[] ENCODE_TABLE = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
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'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
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'2', '3', '4', '5', '6', '7',
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};
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/**
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* This array is a lookup table that translates Unicode characters drawn from the "Base32 |Hex Alphabet" (as specified in
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* Table 3 of RFC 2045) into their 5-bit positive integer equivalents. Characters that are not in the Base32 Hex
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* alphabet but fall within the bounds of the array are translated to -1.
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*
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*/
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private static final byte[] HEX_DECODE_TABLE = {
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// 0 1 2 3 4 5 6 7 8 9 A B C D E F
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 00-0f
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, // 10-1f
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 63, // 20-2f
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, // 30-3f 2-7
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-1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, // 40-4f A-N
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25, 26, 27, 28, 29, 30, 31, 32, // 50-57 O-V
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};
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/**
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* This array is a lookup table that translates 5-bit positive integer index values into their "Base32 Hex Alphabet"
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* equivalents as specified in Table 3 of RFC 2045.
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*/
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private static final byte[] HEX_ENCODE_TABLE = {
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
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'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
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};
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/** Mask used to extract 5 bits, used when encoding Base32 bytes */
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private static final int MASK_5BITS = 0x1f;
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// The static final fields above are used for the original static byte[] methods on Base32.
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// The private member fields below are used with the new streaming approach, which requires
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// some state be preserved between calls of encode() and decode().
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/**
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* Place holder for the bytes we're dealing with for our based logic.
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* Bitwise operations store and extract the encoding or decoding from this variable.
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*/
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private long bitWorkArea;
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/**
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* Convenience variable to help us determine when our buffer is going to run out of room and needs resizing.
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* <code>decodeSize = {@link BYTES_PER_ENCODED_BLOCK} - 1 + lineSeparator.length;</code>
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*/
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private final int decodeSize;
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/**
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* Decode table to use.
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*/
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private final byte[] decodeTable;
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/**
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* Convenience variable to help us determine when our buffer is going to run out of room and needs resizing.
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* <code>encodeSize = {@link BYTES_PER_ENCODED_BLOCK} + lineSeparator.length;</code>
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*/
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private final int encodeSize;
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/**
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* Encode table to use.
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*/
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private final byte[] encodeTable;
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/**
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* Line separator for encoding. Not used when decoding. Only used if lineLength > 0.
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*/
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private final byte[] lineSeparator;
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/**
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* Creates a Base32 codec used for decoding and encoding.
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* <p>
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* When encoding the line length is 0 (no chunking).
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* </p>
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*
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*/
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public Base32() {
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this(false);
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}
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/**
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* Creates a Base32 codec used for decoding and encoding.
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* <p>
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* When encoding the line length is 0 (no chunking).
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* </p>
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* @param useHex if <code>true</code> then use Base32 Hex alphabet
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*/
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public Base32(boolean useHex) {
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this(0, null, useHex);
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}
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/**
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* Creates a Base32 codec used for decoding and encoding.
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* <p>
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* When encoding the line length is given in the constructor, the line separator is CRLF.
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* </p>
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*
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* @param lineLength
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* Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 8).
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* If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.
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*/
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public Base32(int lineLength) {
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this(lineLength, CHUNK_SEPARATOR);
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}
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/**
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* Creates a Base32 codec used for decoding and encoding.
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* <p>
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* When encoding the line length and line separator are given in the constructor.
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* </p>
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* <p>
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* Line lengths that aren't multiples of 8 will still essentially end up being multiples of 8 in the encoded data.
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* </p>
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*
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* @param lineLength
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* Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 8).
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* If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.
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* @param lineSeparator
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* Each line of encoded data will end with this sequence of bytes.
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* @throws IllegalArgumentException
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* The provided lineSeparator included some Base32 characters. That's not going to work!
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*/
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public Base32(int lineLength, byte[] lineSeparator) {
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this(lineLength, lineSeparator, false);
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}
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/**
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* Creates a Base32 / Base32 Hex codec used for decoding and encoding.
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* <p>
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* When encoding the line length and line separator are given in the constructor.
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* </p>
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* <p>
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* Line lengths that aren't multiples of 8 will still essentially end up being multiples of 8 in the encoded data.
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* </p>
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*
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* @param lineLength
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* Each line of encoded data will be at most of the given length (rounded down to nearest multiple of 8).
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* If lineLength <= 0, then the output will not be divided into lines (chunks). Ignored when decoding.
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* @param lineSeparator
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* Each line of encoded data will end with this sequence of bytes.
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* @param useHex if <code>true</code>, then use Base32 Hex alphabet, otherwise use Base32 alphabet
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* @throws IllegalArgumentException
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* The provided lineSeparator included some Base32 characters. That's not going to work!
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* Or the lineLength > 0 and lineSeparator is null.
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*/
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public Base32(int lineLength, byte[] lineSeparator, boolean useHex) {
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super(BYTES_PER_UNENCODED_BLOCK, BYTES_PER_ENCODED_BLOCK,
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lineLength,
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lineSeparator == null ? 0 : lineSeparator.length);
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if (useHex){
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this.encodeTable = HEX_ENCODE_TABLE;
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this.decodeTable = HEX_DECODE_TABLE;
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} else {
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this.encodeTable = ENCODE_TABLE;
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this.decodeTable = DECODE_TABLE;
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}
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if (lineLength > 0) {
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if (lineSeparator == null) {
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throw new IllegalArgumentException("lineLength "+lineLength+" > 0, but lineSeparator is null");
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}
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// Must be done after initializing the tables
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if (containsAlphabetOrPad(lineSeparator)) {
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String sep = StringUtils.newStringUtf8(lineSeparator);
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throw new IllegalArgumentException("lineSeparator must not contain Base32 characters: [" + sep + "]");
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}
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this.encodeSize = BYTES_PER_ENCODED_BLOCK + lineSeparator.length;
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this.lineSeparator = new byte[lineSeparator.length];
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System.arraycopy(lineSeparator, 0, this.lineSeparator, 0, lineSeparator.length);
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} else {
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this.encodeSize = BYTES_PER_ENCODED_BLOCK;
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this.lineSeparator = null;
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}
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this.decodeSize = this.encodeSize - 1;
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}
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/**
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* <p>
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* Decodes all of the provided data, starting at inPos, for inAvail bytes. Should be called at least twice: once
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* with the data to decode, and once with inAvail set to "-1" to alert decoder that EOF has been reached. The "-1"
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* call is not necessary when decoding, but it doesn't hurt, either.
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* </p>
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* <p>
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* Ignores all non-Base32 characters. This is how chunked (e.g. 76 character) data is handled, since CR and LF are
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* silently ignored, but has implications for other bytes, too. This method subscribes to the garbage-in,
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* garbage-out philosophy: it will not check the provided data for validity.
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* </p>
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*
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* @param in
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* byte[] array of ascii data to Base32 decode.
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* @param inPos
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* Position to start reading data from.
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* @param inAvail
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* Amount of bytes available from input for encoding.
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*
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* Output is written to {@link #buffer} as 8-bit octets, using {@link pos} as the buffer position
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*/
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void decode(byte[] in, int inPos, int inAvail) { // package protected for access from I/O streams
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if (eof) {
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return;
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}
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if (inAvail < 0) {
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eof = true;
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}
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for (int i = 0; i < inAvail; i++) {
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byte b = in[inPos++];
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if (b == PAD) {
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// We're done.
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eof = true;
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break;
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} else {
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ensureBufferSize(decodeSize);
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if (b >= 0 && b < this.decodeTable.length) {
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int result = this.decodeTable[b];
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if (result >= 0) {
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modulus = (modulus+1) % BYTES_PER_ENCODED_BLOCK;
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bitWorkArea = (bitWorkArea << BITS_PER_ENCODED_BYTE) + result; // collect decoded bytes
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if (modulus == 0) { // we can output the 5 bytes
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buffer[pos++] = (byte) ((bitWorkArea >> 32) & MASK_8BITS);
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buffer[pos++] = (byte) ((bitWorkArea >> 24) & MASK_8BITS);
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buffer[pos++] = (byte) ((bitWorkArea >> 16) & MASK_8BITS);
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buffer[pos++] = (byte) ((bitWorkArea >> 8) & MASK_8BITS);
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buffer[pos++] = (byte) (bitWorkArea & MASK_8BITS);
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}
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}
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}
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}
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}
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// Two forms of EOF as far as Base32 decoder is concerned: actual
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// EOF (-1) and first time '=' character is encountered in stream.
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// This approach makes the '=' padding characters completely optional.
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if (eof && modulus >= 2) { // if modulus < 2, nothing to do
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ensureBufferSize(decodeSize);
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// we ignore partial bytes, i.e. only multiples of 8 count
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switch (modulus) {
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case 2 : // 10 bits, drop 2 and output one byte
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buffer[pos++] = (byte) ((bitWorkArea >> 2) & MASK_8BITS);
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break;
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case 3 : // 15 bits, drop 7 and output 1 byte
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buffer[pos++] = (byte) ((bitWorkArea >> 7) & MASK_8BITS);
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break;
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case 4 : // 20 bits = 2*8 + 4
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bitWorkArea = bitWorkArea >> 4; // drop 4 bits
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buffer[pos++] = (byte) ((bitWorkArea >> 8) & MASK_8BITS);
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buffer[pos++] = (byte) ((bitWorkArea) & MASK_8BITS);
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break;
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case 5 : // 25bits = 3*8 + 1
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bitWorkArea = bitWorkArea >> 1;
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buffer[pos++] = (byte) ((bitWorkArea >> 16) & MASK_8BITS);
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buffer[pos++] = (byte) ((bitWorkArea >> 8) & MASK_8BITS);
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buffer[pos++] = (byte) ((bitWorkArea) & MASK_8BITS);
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break;
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case 6 : // 30bits = 3*8 + 6
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bitWorkArea = bitWorkArea >> 6;
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buffer[pos++] = (byte) ((bitWorkArea >> 16) & MASK_8BITS);
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buffer[pos++] = (byte) ((bitWorkArea >> 8) & MASK_8BITS);
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buffer[pos++] = (byte) ((bitWorkArea) & MASK_8BITS);
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break;
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case 7 : // 35 = 4*8 +3
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bitWorkArea = bitWorkArea >> 3;
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buffer[pos++] = (byte) ((bitWorkArea >> 24) & MASK_8BITS);
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buffer[pos++] = (byte) ((bitWorkArea >> 16) & MASK_8BITS);
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buffer[pos++] = (byte) ((bitWorkArea >> 8) & MASK_8BITS);
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buffer[pos++] = (byte) ((bitWorkArea) & MASK_8BITS);
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break;
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}
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}
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}
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/**
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* <p>
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* Encodes all of the provided data, starting at inPos, for inAvail bytes. Must be called at least twice: once with
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* the data to encode, and once with inAvail set to "-1" to alert encoder that EOF has been reached, so flush last
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* remaining bytes (if not multiple of 5).
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* </p>
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*
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* @param in
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* byte[] array of binary data to Base32 encode.
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* @param inPos
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* Position to start reading data from.
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* @param inAvail
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* Amount of bytes available from input for encoding.
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*/
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void encode(byte[] in, int inPos, int inAvail) { // package protected for access from I/O streams
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if (eof) {
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return;
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}
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// inAvail < 0 is how we're informed of EOF in the underlying data we're
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// encoding.
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if (inAvail < 0) {
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eof = true;
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if (0 == modulus && lineLength == 0) {
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return; // no leftovers to process and not using chunking
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}
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ensureBufferSize(encodeSize);
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int savedPos = pos;
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switch (modulus) { // % 5
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case 1 : // Only 1 octet; take top 5 bits then remainder
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buffer[pos++] = encodeTable[(int)(bitWorkArea >> 3) & MASK_5BITS]; // 8-1*5 = 3
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buffer[pos++] = encodeTable[(int)(bitWorkArea << 2) & MASK_5BITS]; // 5-3=2
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buffer[pos++] = PAD;
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buffer[pos++] = PAD;
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buffer[pos++] = PAD;
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buffer[pos++] = PAD;
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buffer[pos++] = PAD;
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buffer[pos++] = PAD;
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break;
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case 2 : // 2 octets = 16 bits to use
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buffer[pos++] = encodeTable[(int)(bitWorkArea >> 11) & MASK_5BITS]; // 16-1*5 = 11
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buffer[pos++] = encodeTable[(int)(bitWorkArea >> 6) & MASK_5BITS]; // 16-2*5 = 6
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buffer[pos++] = encodeTable[(int)(bitWorkArea >> 1) & MASK_5BITS]; // 16-3*5 = 1
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buffer[pos++] = encodeTable[(int)(bitWorkArea << 4) & MASK_5BITS]; // 5-1 = 4
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buffer[pos++] = PAD;
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buffer[pos++] = PAD;
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buffer[pos++] = PAD;
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buffer[pos++] = PAD;
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break;
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case 3 : // 3 octets = 24 bits to use
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buffer[pos++] = encodeTable[(int)(bitWorkArea >> 19) & MASK_5BITS]; // 24-1*5 = 19
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buffer[pos++] = encodeTable[(int)(bitWorkArea >> 14) & MASK_5BITS]; // 24-2*5 = 14
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buffer[pos++] = encodeTable[(int)(bitWorkArea >> 9) & MASK_5BITS]; // 24-3*5 = 9
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buffer[pos++] = encodeTable[(int)(bitWorkArea >> 4) & MASK_5BITS]; // 24-4*5 = 4
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buffer[pos++] = encodeTable[(int)(bitWorkArea << 1) & MASK_5BITS]; // 5-4 = 1
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buffer[pos++] = PAD;
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buffer[pos++] = PAD;
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buffer[pos++] = PAD;
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break;
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case 4 : // 4 octets = 32 bits to use
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buffer[pos++] = encodeTable[(int)(bitWorkArea >> 27) & MASK_5BITS]; // 32-1*5 = 27
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buffer[pos++] = encodeTable[(int)(bitWorkArea >> 22) & MASK_5BITS]; // 32-2*5 = 22
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buffer[pos++] = encodeTable[(int)(bitWorkArea >> 17) & MASK_5BITS]; // 32-3*5 = 17
|
|
buffer[pos++] = encodeTable[(int)(bitWorkArea >> 12) & MASK_5BITS]; // 32-4*5 = 12
|
|
buffer[pos++] = encodeTable[(int)(bitWorkArea >> 7) & MASK_5BITS]; // 32-5*5 = 7
|
|
buffer[pos++] = encodeTable[(int)(bitWorkArea >> 2) & MASK_5BITS]; // 32-6*5 = 2
|
|
buffer[pos++] = encodeTable[(int)(bitWorkArea << 3) & MASK_5BITS]; // 5-2 = 3
|
|
buffer[pos++] = PAD;
|
|
break;
|
|
}
|
|
currentLinePos += pos - savedPos; // keep track of current line position
|
|
// if currentPos == 0 we are at the start of a line, so don't add CRLF
|
|
if (lineLength > 0 && currentLinePos > 0){ // add chunk separator if required
|
|
System.arraycopy(lineSeparator, 0, buffer, pos, lineSeparator.length);
|
|
pos += lineSeparator.length;
|
|
}
|
|
} else {
|
|
for (int i = 0; i < inAvail; i++) {
|
|
ensureBufferSize(encodeSize);
|
|
modulus = (modulus+1) % BYTES_PER_UNENCODED_BLOCK;
|
|
int b = in[inPos++];
|
|
if (b < 0) {
|
|
b += 256;
|
|
}
|
|
bitWorkArea = (bitWorkArea << 8) + b; // BITS_PER_BYTE
|
|
if (0 == modulus) { // we have enough bytes to create our output
|
|
buffer[pos++] = encodeTable[(int)(bitWorkArea >> 35) & MASK_5BITS];
|
|
buffer[pos++] = encodeTable[(int)(bitWorkArea >> 30) & MASK_5BITS];
|
|
buffer[pos++] = encodeTable[(int)(bitWorkArea >> 25) & MASK_5BITS];
|
|
buffer[pos++] = encodeTable[(int)(bitWorkArea >> 20) & MASK_5BITS];
|
|
buffer[pos++] = encodeTable[(int)(bitWorkArea >> 15) & MASK_5BITS];
|
|
buffer[pos++] = encodeTable[(int)(bitWorkArea >> 10) & MASK_5BITS];
|
|
buffer[pos++] = encodeTable[(int)(bitWorkArea >> 5) & MASK_5BITS];
|
|
buffer[pos++] = encodeTable[(int)bitWorkArea & MASK_5BITS];
|
|
currentLinePos += BYTES_PER_ENCODED_BLOCK;
|
|
if (lineLength > 0 && lineLength <= currentLinePos) {
|
|
System.arraycopy(lineSeparator, 0, buffer, pos, lineSeparator.length);
|
|
pos += lineSeparator.length;
|
|
currentLinePos = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns whether or not the <code>octet</code> is in the Base32 alphabet.
|
|
*
|
|
* @param octet
|
|
* The value to test
|
|
* @return <code>true</code> if the value is defined in the the Base32 alphabet <code>false</code> otherwise.
|
|
*/
|
|
public boolean isInAlphabet(byte octet) {
|
|
return octet >= 0 && octet < decodeTable.length && decodeTable[octet] != -1;
|
|
}
|
|
}
|