616 lines
23 KiB
Java
616 lines
23 KiB
Java
/*
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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.apache.tomcat.util.codec.binary;
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import org.apache.tomcat.util.buf.HexUtils;
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import org.apache.tomcat.util.codec.BinaryDecoder;
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import org.apache.tomcat.util.codec.BinaryEncoder;
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import org.apache.tomcat.util.codec.DecoderException;
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import org.apache.tomcat.util.codec.EncoderException;
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import org.apache.tomcat.util.res.StringManager;
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/**
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* Abstract superclass for Base-N encoders and decoders.
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*
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* <p>
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* This class is thread-safe.
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* </p>
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*/
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@SuppressWarnings("deprecation")
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public abstract class BaseNCodec implements BinaryEncoder, BinaryDecoder {
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protected static final StringManager sm = StringManager.getManager(BaseNCodec.class);
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/**
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* Holds thread context so classes can be thread-safe.
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*
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* This class is not itself thread-safe; each thread must allocate its own copy.
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*
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* @since 1.7
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*/
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static class Context {
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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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int ibitWorkArea;
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/**
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* Buffer for streaming.
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*/
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byte[] buffer;
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/**
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* Position where next character should be written in the buffer.
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*/
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int pos;
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/**
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* Position where next character should be read from the buffer.
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*/
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int readPos;
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/**
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* Boolean flag to indicate the EOF has been reached. Once EOF has been reached, this object becomes useless,
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* and must be thrown away.
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*/
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boolean eof;
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/**
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* Variable tracks how many characters have been written to the current line. Only used when encoding. We use
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* it to make sure each encoded line never goes beyond lineLength (if lineLength > 0).
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*/
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int currentLinePos;
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/**
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* Writes to the buffer only occur after every 3/5 reads when encoding, and every 4/8 reads when decoding. This
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* variable helps track that.
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*/
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int modulus;
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Context() {
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}
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/**
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* Returns a String useful for debugging (especially within a debugger.)
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*
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* @return a String useful for debugging.
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*/
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@SuppressWarnings("boxing") // OK to ignore boxing here
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@Override
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public String toString() {
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return String.format("%s[buffer=%s, currentLinePos=%s, eof=%s, " +
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"ibitWorkArea=%s, modulus=%s, pos=%s, " +
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"readPos=%s]", this.getClass().getSimpleName(),
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HexUtils.toHexString(buffer), currentLinePos, eof,
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ibitWorkArea, modulus, pos, readPos);
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}
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}
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/**
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* EOF
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*
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* @since 1.7
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*/
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static final int EOF = -1;
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/**
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* MIME chunk size per RFC 2045 section 6.8.
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*
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* <p>
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* The {@value} character limit does not count the trailing CRLF, but counts all other characters, including any
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* equal signs.
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* </p>
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*
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* @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 6.8</a>
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*/
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public static final int MIME_CHUNK_SIZE = 76;
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/**
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* PEM chunk size per RFC 1421 section 4.3.2.4.
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*
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* <p>
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* The {@value} character limit does not count the trailing CRLF, but counts all other characters, including any
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* equal signs.
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* </p>
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*
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* @see <a href="http://tools.ietf.org/html/rfc1421">RFC 1421 section 4.3.2.4</a>
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*/
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public static final int PEM_CHUNK_SIZE = 64;
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private static final int DEFAULT_BUFFER_RESIZE_FACTOR = 2;
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/**
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* Defines the default buffer size - currently {@value}
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* - must be large enough for at least one encoded block+separator
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*/
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private static final int DEFAULT_BUFFER_SIZE = 128;
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/**
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* The maximum size buffer to allocate.
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*
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* <p>This is set to the same size used in the JDK {@code java.util.ArrayList}:</p>
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* <blockquote>
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* Some VMs reserve some header words in an array.
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* Attempts to allocate larger arrays may result in
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* OutOfMemoryError: Requested array size exceeds VM limit.
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* </blockquote>
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*/
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private static final int MAX_BUFFER_SIZE = Integer.MAX_VALUE - 8;
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/** Mask used to extract 8 bits, used in decoding bytes */
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protected static final int MASK_8BITS = 0xff;
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/**
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* Byte used to pad output.
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*/
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protected static final byte PAD_DEFAULT = '='; // Allow static access to default
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protected final byte pad; // instance variable just in case it needs to vary later
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/** Number of bytes in each full block of unencoded data, e.g. 4 for Base64 and 5 for Base32 */
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private final int unencodedBlockSize;
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/** Number of bytes in each full block of encoded data, e.g. 3 for Base64 and 8 for Base32 */
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private final int encodedBlockSize;
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/**
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* Chunksize for encoding. Not used when decoding.
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* A value of zero or less implies no chunking of the encoded data.
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* Rounded down to nearest multiple of encodedBlockSize.
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*/
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protected final int lineLength;
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/**
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* Size of chunk separator. Not used unless {@link #lineLength} > 0.
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*/
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private final int chunkSeparatorLength;
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/**
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* Note <code>lineLength</code> is rounded down to the nearest multiple of the encoded block size.
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* If <code>chunkSeparatorLength</code> is zero, then chunking is disabled.
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* @param unencodedBlockSize the size of an unencoded block (e.g. Base64 = 3)
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* @param encodedBlockSize the size of an encoded block (e.g. Base64 = 4)
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* @param lineLength if > 0, use chunking with a length <code>lineLength</code>
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* @param chunkSeparatorLength the chunk separator length, if relevant
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*/
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protected BaseNCodec(final int unencodedBlockSize, final int encodedBlockSize,
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final int lineLength, final int chunkSeparatorLength) {
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this(unencodedBlockSize, encodedBlockSize, lineLength, chunkSeparatorLength, PAD_DEFAULT);
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}
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/**
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* Note <code>lineLength</code> is rounded down to the nearest multiple of the encoded block size.
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* If <code>chunkSeparatorLength</code> is zero, then chunking is disabled.
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* @param unencodedBlockSize the size of an unencoded block (e.g. Base64 = 3)
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* @param encodedBlockSize the size of an encoded block (e.g. Base64 = 4)
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* @param lineLength if > 0, use chunking with a length <code>lineLength</code>
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* @param chunkSeparatorLength the chunk separator length, if relevant
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* @param pad byte used as padding byte.
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*/
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protected BaseNCodec(final int unencodedBlockSize, final int encodedBlockSize,
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final int lineLength, final int chunkSeparatorLength, final byte pad) {
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this.unencodedBlockSize = unencodedBlockSize;
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this.encodedBlockSize = encodedBlockSize;
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final boolean useChunking = lineLength > 0 && chunkSeparatorLength > 0;
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this.lineLength = useChunking ? (lineLength / encodedBlockSize) * encodedBlockSize : 0;
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this.chunkSeparatorLength = chunkSeparatorLength;
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this.pad = pad;
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}
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/**
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* Returns true if this object has buffered data for reading.
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*
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* @param context the context to be used
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* @return true if there is data still available for reading.
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*/
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boolean hasData(final Context context) { // package protected for access from I/O streams
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return context.buffer != null;
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}
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/**
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* Returns the amount of buffered data available for reading.
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*
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* @param context the context to be used
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* @return The amount of buffered data available for reading.
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*/
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int available(final Context context) { // package protected for access from I/O streams
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return context.buffer != null ? context.pos - context.readPos : 0;
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}
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/**
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* Get the default buffer size. Can be overridden.
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*
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* @return the default buffer size.
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*/
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protected int getDefaultBufferSize() {
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return DEFAULT_BUFFER_SIZE;
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}
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/**
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* Increases our buffer by the {@link #DEFAULT_BUFFER_RESIZE_FACTOR}.
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* @param context the context to be used
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* @param minCapacity the minimum required capacity
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* @return the resized byte[] buffer
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* @throws OutOfMemoryError if the {@code minCapacity} is negative
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*/
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private static byte[] resizeBuffer(final Context context, final int minCapacity) {
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// Overflow-conscious code treats the min and new capacity as unsigned.
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final int oldCapacity = context.buffer.length;
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int newCapacity = oldCapacity * DEFAULT_BUFFER_RESIZE_FACTOR;
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if (compareUnsigned(newCapacity, minCapacity) < 0) {
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newCapacity = minCapacity;
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}
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if (compareUnsigned(newCapacity, MAX_BUFFER_SIZE) > 0) {
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newCapacity = createPositiveCapacity(minCapacity);
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}
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final byte[] b = new byte[newCapacity];
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System.arraycopy(context.buffer, 0, b, 0, context.buffer.length);
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context.buffer = b;
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return b;
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}
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/**
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* Compares two {@code int} values numerically treating the values
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* as unsigned. Taken from JDK 1.8.
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*
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* <p>TODO: Replace with JDK 1.8 Integer::compareUnsigned(int, int).</p>
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*
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* @param x the first {@code int} to compare
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* @param y the second {@code int} to compare
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* @return the value {@code 0} if {@code x == y}; a value less
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* than {@code 0} if {@code x < y} as unsigned values; and
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* a value greater than {@code 0} if {@code x > y} as
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* unsigned values
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*/
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private static int compareUnsigned(int x, int y) {
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return Integer.compare(x + Integer.MIN_VALUE, y + Integer.MIN_VALUE);
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}
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/**
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* Create a positive capacity at least as large the minimum required capacity.
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* If the minimum capacity is negative then this throws an OutOfMemoryError as no array
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* can be allocated.
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*
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* @param minCapacity the minimum capacity
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* @return the capacity
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* @throws OutOfMemoryError if the {@code minCapacity} is negative
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*/
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private static int createPositiveCapacity(int minCapacity) {
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if (minCapacity < 0) {
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// overflow
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throw new OutOfMemoryError("Unable to allocate array size: " + (minCapacity & 0xffffffffL));
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}
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// This is called when we require buffer expansion to a very big array.
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// Use the conservative maximum buffer size if possible, otherwise the biggest required.
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//
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// Note: In this situation JDK 1.8 java.util.ArrayList returns Integer.MAX_VALUE.
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// This excludes some VMs that can exceed MAX_BUFFER_SIZE but not allocate a full
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// Integer.MAX_VALUE length array.
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// The result is that we may have to allocate an array of this size more than once if
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// the capacity must be expanded again.
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return (minCapacity > MAX_BUFFER_SIZE) ?
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minCapacity :
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MAX_BUFFER_SIZE;
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}
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/**
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* Ensure that the buffer has room for <code>size</code> bytes
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*
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* @param size minimum spare space required
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* @param context the context to be used
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* @return the buffer
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*/
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protected byte[] ensureBufferSize(final int size, final Context context){
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if (context.buffer == null) {
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context.buffer = new byte[getDefaultBufferSize()];
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context.pos = 0;
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context.readPos = 0;
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// Overflow-conscious:
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// x + y > z == x + y - z > 0
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} else if (context.pos + size - context.buffer.length > 0) {
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return resizeBuffer(context, context.pos + size);
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}
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return context.buffer;
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}
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/**
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* Extracts buffered data into the provided byte[] array, starting at position bPos, up to a maximum of bAvail
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* bytes. Returns how many bytes were actually extracted.
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* <p>
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* Package protected for access from I/O streams.
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*
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* @param b
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* byte[] array to extract the buffered data into.
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* @param bPos
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* position in byte[] array to start extraction at.
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* @param bAvail
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* amount of bytes we're allowed to extract. We may extract fewer (if fewer are available).
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* @param context
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* the context to be used
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* @return The number of bytes successfully extracted into the provided byte[] array.
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*/
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int readResults(final byte[] b, final int bPos, final int bAvail, final Context context) {
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if (context.buffer != null) {
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final int len = Math.min(available(context), bAvail);
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System.arraycopy(context.buffer, context.readPos, b, bPos, len);
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context.readPos += len;
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if (context.readPos >= context.pos) {
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context.buffer = null; // so hasData() will return false, and this method can return -1
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}
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return len;
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}
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return context.eof ? EOF : 0;
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}
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/**
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* Checks if a byte value is whitespace or not.
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* Whitespace is taken to mean: space, tab, CR, LF
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* @param byteToCheck
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* the byte to check
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* @return true if byte is whitespace, false otherwise
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*/
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protected static boolean isWhiteSpace(final byte byteToCheck) {
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switch (byteToCheck) {
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case ' ' :
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case '\n' :
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case '\r' :
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case '\t' :
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return true;
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default :
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return false;
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}
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}
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/**
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* Encodes an Object using the Base-N algorithm. This method is provided in order to satisfy the requirements of
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* the Encoder interface, and will throw an EncoderException if the supplied object is not of type byte[].
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*
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* @param obj
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* Object to encode
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* @return An object (of type byte[]) containing the Base-N encoded data which corresponds to the byte[] supplied.
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* @throws EncoderException
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* if the parameter supplied is not of type byte[]
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* @deprecated This unused method will be removed in Tomcat 9
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*/
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@Override
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@Deprecated
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public Object encode(final Object obj) throws EncoderException {
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if (!(obj instanceof byte[])) {
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throw new EncoderException("Parameter supplied to Base-N encode is not a byte[]");
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}
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return encode((byte[]) obj);
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}
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/**
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* Encodes a byte[] containing binary data, into a String containing characters in the Base-N alphabet.
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* Uses UTF8 encoding.
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*
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* @param pArray
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* a byte array containing binary data
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* @return A String containing only Base-N character data
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*/
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public String encodeToString(final byte[] pArray) {
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return StringUtils.newStringUtf8(encode(pArray));
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}
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/**
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* Encodes a byte[] containing binary data, into a String containing characters in the appropriate alphabet.
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* Uses UTF8 encoding.
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*
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* @param pArray a byte array containing binary data
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* @return String containing only character data in the appropriate alphabet.
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* @since 1.5
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* This is a duplicate of {@link #encodeToString(byte[])}; it was merged during refactoring.
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*/
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public String encodeAsString(final byte[] pArray){
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return StringUtils.newStringUtf8(encode(pArray));
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}
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/**
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* Decodes an Object using the Base-N algorithm. This method is provided in order to satisfy the requirements of
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* the Decoder interface, and will throw a DecoderException if the supplied object is not of type byte[] or String.
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*
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* @param obj
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* Object to decode
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* @return An object (of type byte[]) containing the binary data which corresponds to the byte[] or String
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* supplied.
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* @throws DecoderException
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* if the parameter supplied is not of type byte[]
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* @deprecated This unused method will be removed in Tomcat 9
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*/
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@Override
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@Deprecated
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public Object decode(final Object obj) throws DecoderException {
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if (obj instanceof byte[]) {
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return decode((byte[]) obj);
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} else if (obj instanceof String) {
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return decode((String) obj);
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} else {
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throw new DecoderException("Parameter supplied to Base-N decode is not a byte[] or a String");
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}
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}
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/**
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* Decodes a String containing characters in the Base-N alphabet.
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*
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* @param pArray
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* A String containing Base-N character data
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* @return a byte array containing binary data
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*/
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public byte[] decode(final String pArray) {
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return decode(StringUtils.getBytesUtf8(pArray));
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}
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/**
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* Decodes a byte[] containing characters in the Base-N alphabet.
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*
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* @param pArray
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* A byte array containing Base-N character data
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* @return a byte array containing binary data
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*/
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@Override
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public byte[] decode(final byte[] pArray) {
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return decode(pArray, 0, pArray.length);
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}
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public byte[] decode(final byte[] pArray, final int off, final int len) {
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if (pArray == null || len == 0) {
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return new byte[0];
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}
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final Context context = new Context();
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decode(pArray, off, len, context);
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decode(pArray, off, EOF, context); // Notify decoder of EOF.
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final byte[] result = new byte[context.pos];
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readResults(result, 0, result.length, context);
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return result;
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}
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/**
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* Encodes a byte[] containing binary data, into a byte[] containing characters in the alphabet.
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*
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* @param pArray
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* a byte array containing binary data
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* @return A byte array containing only the base N alphabetic character data
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*/
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@Override
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public byte[] encode(final byte[] pArray) {
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if (pArray == null || pArray.length == 0) {
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return pArray;
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}
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return encode(pArray, 0, pArray.length);
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}
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/**
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* Encodes a byte[] containing binary data, into a byte[] containing
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* characters in the alphabet.
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*
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* @param pArray
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* a byte array containing binary data
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* @param offset
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* initial offset of the subarray.
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* @param length
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* length of the subarray.
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* @return A byte array containing only the base N alphabetic character data
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* @since 1.11
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*/
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public byte[] encode(final byte[] pArray, final int offset, final int length) {
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if (pArray == null || pArray.length == 0) {
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return pArray;
|
|
}
|
|
final Context context = new Context();
|
|
encode(pArray, offset, length, context);
|
|
encode(pArray, offset, EOF, context); // Notify encoder of EOF.
|
|
final byte[] buf = new byte[context.pos - context.readPos];
|
|
readResults(buf, 0, buf.length, context);
|
|
return buf;
|
|
}
|
|
|
|
// package protected for access from I/O streams
|
|
abstract void encode(byte[] pArray, int i, int length, Context context);
|
|
|
|
// package protected for access from I/O streams
|
|
abstract void decode(byte[] pArray, int i, int length, Context context);
|
|
|
|
/**
|
|
* Returns whether or not the <code>octet</code> is in the current alphabet.
|
|
* Does not allow whitespace or pad.
|
|
*
|
|
* @param value The value to test
|
|
*
|
|
* @return <code>true</code> if the value is defined in the current alphabet, <code>false</code> otherwise.
|
|
*/
|
|
protected abstract boolean isInAlphabet(byte value);
|
|
|
|
/**
|
|
* Tests a given byte array to see if it contains only valid characters within the alphabet.
|
|
* The method optionally treats whitespace and pad as valid.
|
|
*
|
|
* @param arrayOctet byte array to test
|
|
* @param allowWSPad if <code>true</code>, then whitespace and PAD are also allowed
|
|
*
|
|
* @return <code>true</code> if all bytes are valid characters in the alphabet or if the byte array is empty;
|
|
* <code>false</code>, otherwise
|
|
*/
|
|
public boolean isInAlphabet(final byte[] arrayOctet, final boolean allowWSPad) {
|
|
for (final byte octet : arrayOctet) {
|
|
if (!isInAlphabet(octet) &&
|
|
(!allowWSPad || (octet != pad) && !isWhiteSpace(octet))) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Tests a given String to see if it contains only valid characters within the alphabet.
|
|
* The method treats whitespace and PAD as valid.
|
|
*
|
|
* @param basen String to test
|
|
* @return <code>true</code> if all characters in the String are valid characters in the alphabet or if
|
|
* the String is empty; <code>false</code>, otherwise
|
|
* @see #isInAlphabet(byte[], boolean)
|
|
*/
|
|
public boolean isInAlphabet(final String basen) {
|
|
return isInAlphabet(StringUtils.getBytesUtf8(basen), true);
|
|
}
|
|
|
|
/**
|
|
* Tests a given byte array to see if it contains any characters within the alphabet or PAD.
|
|
*
|
|
* Intended for use in checking line-ending arrays
|
|
*
|
|
* @param arrayOctet
|
|
* byte array to test
|
|
* @return <code>true</code> if any byte is a valid character in the alphabet or PAD; <code>false</code> otherwise
|
|
*/
|
|
protected boolean containsAlphabetOrPad(final byte[] arrayOctet) {
|
|
if (arrayOctet == null) {
|
|
return false;
|
|
}
|
|
for (final byte element : arrayOctet) {
|
|
if (pad == element || isInAlphabet(element)) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Calculates the amount of space needed to encode the supplied array.
|
|
*
|
|
* @param pArray byte[] array which will later be encoded
|
|
*
|
|
* @return amount of space needed to encoded the supplied array.
|
|
* Returns a long since a max-len array will require > Integer.MAX_VALUE
|
|
*/
|
|
public long getEncodedLength(final byte[] pArray) {
|
|
// Calculate non-chunked size - rounded up to allow for padding
|
|
// cast to long is needed to avoid possibility of overflow
|
|
long len = ((pArray.length + unencodedBlockSize-1) / unencodedBlockSize) * (long) encodedBlockSize;
|
|
if (lineLength > 0) { // We're using chunking
|
|
// Round up to nearest multiple
|
|
len += ((len + lineLength-1) / lineLength) * chunkSeparatorLength;
|
|
}
|
|
return len;
|
|
}
|
|
}
|