1 files changed, 445 insertions, 0 deletions
diff --git a/mobile/android/thirdparty/org/mozilla/apache/commons/codec/binary/BaseNCodec.java b/mobile/android/thirdparty/org/mozilla/apache/commons/codec/binary/BaseNCodec.java
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index 000000000..c2ed4efef
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+++ b/mobile/android/thirdparty/org/mozilla/apache/commons/codec/binary/BaseNCodec.java
@@ -0,0 +1,445 @@
+// Mozilla has modified this file - see http://hg.mozilla.org/ for details.
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF 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
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.mozilla.apache.commons.codec.binary;
+
+import org.mozilla.apache.commons.codec.BinaryDecoder;
+import org.mozilla.apache.commons.codec.BinaryEncoder;
+import org.mozilla.apache.commons.codec.DecoderException;
+import org.mozilla.apache.commons.codec.EncoderException;
+
+/**
+ * Abstract superclass for Base-N encoders and decoders.
+ *
+ * <p>
+ * This class is not thread-safe.
+ * Each thread should use its own instance.
+ * </p>
+ */
+public abstract class BaseNCodec implements BinaryEncoder, BinaryDecoder {
+
+    /**
+     *  MIME chunk size per RFC 2045 section 6.8.
+     *
+     * <p>
+     * The {@value} character limit does not count the trailing CRLF, but counts all other characters, including any
+     * equal signs.
+     * </p>
+     *
+     * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 6.8</a>
+     */
+    public static final int MIME_CHUNK_SIZE = 76;
+
+    /**
+     * PEM chunk size per RFC 1421 section 4.3.2.4.
+     *
+     * <p>
+     * The {@value} character limit does not count the trailing CRLF, but counts all other characters, including any
+     * equal signs.
+     * </p>
+     *
+     * @see <a href="http://tools.ietf.org/html/rfc1421">RFC 1421 section 4.3.2.4</a>
+     */
+    public static final int PEM_CHUNK_SIZE = 64;
+
+    private static final int DEFAULT_BUFFER_RESIZE_FACTOR = 2;
+
+    /**
+     * Defines the default buffer size - currently {@value}
+     * - must be large enough for at least one encoded block+separator
+     */
+    private static final int DEFAULT_BUFFER_SIZE = 8192;
+
+    /** Mask used to extract 8 bits, used in decoding bytes */
+    protected static final int MASK_8BITS = 0xff;
+
+    /**
+     * Byte used to pad output.
+     */
+    protected static final byte PAD_DEFAULT = '='; // Allow static access to default
+    
+    protected final byte PAD = PAD_DEFAULT; // instance variable just in case it needs to vary later
+
+    /** Number of bytes in each full block of unencoded data, e.g. 4 for Base64 and 5 for Base32 */
+    private final int unencodedBlockSize;
+
+    /** Number of bytes in each full block of encoded data, e.g. 3 for Base64 and 8 for Base32 */
+    private final int encodedBlockSize;
+
+    /**
+     * Chunksize for encoding. Not used when decoding. 
+     * A value of zero or less implies no chunking of the encoded data.
+     * Rounded down to nearest multiple of encodedBlockSize.
+     */
+    protected final int lineLength;
+    
+    /**
+     * Size of chunk separator. Not used unless {@link #lineLength} > 0. 
+     */
+    private final int chunkSeparatorLength;
+
+    /**
+     * Buffer for streaming.
+     */
+    protected byte[] buffer;
+
+    /**
+     * Position where next character should be written in the buffer.
+     */
+    protected int pos;
+
+    /**
+     * Position where next character should be read from the buffer.
+     */
+    private int readPos;
+
+    /**
+     * Boolean flag to indicate the EOF has been reached. Once EOF has been reached, this object becomes useless,
+     * and must be thrown away.
+     */
+    protected boolean eof;
+
+    /**
+     * Variable tracks how many characters have been written to the current line. Only used when encoding. We use it to
+     * make sure each encoded line never goes beyond lineLength (if lineLength > 0).
+     */
+    protected int currentLinePos;
+
+    /**
+     * Writes to the buffer only occur after every 3/5 reads when encoding, and every 4/8 reads when decoding.
+     * This variable helps track that.
+     */
+    protected int modulus;
+
+    /**
+     * Note <code>lineLength</code> is rounded down to the nearest multiple of {@link #encodedBlockSize}
+     * If <code>chunkSeparatorLength</code> is zero, then chunking is disabled.
+     * @param unencodedBlockSize the size of an unencoded block (e.g. Base64 = 3)
+     * @param encodedBlockSize the size of an encoded block (e.g. Base64 = 4)
+     * @param lineLength if &gt; 0, use chunking with a length <code>lineLength</code>
+     * @param chunkSeparatorLength the chunk separator length, if relevant
+     */
+    protected BaseNCodec(int unencodedBlockSize, int encodedBlockSize, int lineLength, int chunkSeparatorLength){
+        this.unencodedBlockSize = unencodedBlockSize;
+        this.encodedBlockSize = encodedBlockSize;
+        this.lineLength = (lineLength > 0  && chunkSeparatorLength > 0) ? (lineLength / encodedBlockSize) * encodedBlockSize : 0;
+        this.chunkSeparatorLength = chunkSeparatorLength;
+    }
+
+    /**
+     * Returns true if this object has buffered data for reading.
+     *
+     * @return true if there is data still available for reading.
+     */
+    boolean hasData() {  // package protected for access from I/O streams
+        return this.buffer != null;
+    }
+
+    /**
+     * Returns the amount of buffered data available for reading.
+     *
+     * @return The amount of buffered data available for reading.
+     */
+    int available() {  // package protected for access from I/O streams
+        return buffer != null ? pos - readPos : 0;
+    }
+
+    /**
+     * Get the default buffer size. Can be overridden.
+     *
+     * @return {@link #DEFAULT_BUFFER_SIZE}
+     */
+    protected int getDefaultBufferSize() {
+        return DEFAULT_BUFFER_SIZE;
+    }
+
+    /** Increases our buffer by the {@link #DEFAULT_BUFFER_RESIZE_FACTOR}. */
+    private void resizeBuffer() {
+        if (buffer == null) {
+            buffer = new byte[getDefaultBufferSize()];
+            pos = 0;
+            readPos = 0;
+        } else {
+            byte[] b = new byte[buffer.length * DEFAULT_BUFFER_RESIZE_FACTOR];
+            System.arraycopy(buffer, 0, b, 0, buffer.length);
+            buffer = b;
+        }
+    }
+
+    /**
+     * Ensure that the buffer has room for <code>size</code> bytes
+     *
+     * @param size minimum spare space required
+     */
+    protected void ensureBufferSize(int size){
+        if ((buffer == null) || (buffer.length < pos + size)){
+            resizeBuffer();
+        }
+    }
+
+    /**
+     * Extracts buffered data into the provided byte[] array, starting at position bPos, 
+     * up to a maximum of bAvail bytes. Returns how many bytes were actually extracted.
+     *
+     * @param b
+     *            byte[] array to extract the buffered data into.
+     * @param bPos
+     *            position in byte[] array to start extraction at.
+     * @param bAvail
+     *            amount of bytes we're allowed to extract. We may extract fewer (if fewer are available).
+     * @return The number of bytes successfully extracted into the provided byte[] array.
+     */
+    int readResults(byte[] b, int bPos, int bAvail) {  // package protected for access from I/O streams
+        if (buffer != null) {
+            int len = Math.min(available(), bAvail);
+            System.arraycopy(buffer, readPos, b, bPos, len);
+            readPos += len;
+            if (readPos >= pos) {
+                buffer = null; // so hasData() will return false, and this method can return -1
+            }
+            return len;
+        }
+        return eof ? -1 : 0;
+    }
+
+    /**
+     * Checks if a byte value is whitespace or not.
+     * Whitespace is taken to mean: space, tab, CR, LF
+     * @param byteToCheck
+     *            the byte to check
+     * @return true if byte is whitespace, false otherwise
+     */
+    protected static boolean isWhiteSpace(byte byteToCheck) {
+        switch (byteToCheck) {
+            case ' ' :
+            case '\n' :
+            case '\r' :
+            case '\t' :
+                return true;
+            default :
+                return false;
+        }
+    }
+
+    /**
+     * Resets this object to its initial newly constructed state.
+     */
+    private void reset() {
+        buffer = null;
+        pos = 0;
+        readPos = 0;
+        currentLinePos = 0;
+        modulus = 0;
+        eof = false;
+    }
+
+    /**
+     * Encodes an Object using the Base-N algorithm. This method is provided in order to satisfy the requirements of the
+     * Encoder interface, and will throw an EncoderException if the supplied object is not of type byte[].
+     *
+     * @param pObject
+     *            Object to encode
+     * @return An object (of type byte[]) containing the Base-N encoded data which corresponds to the byte[] supplied.
+     * @throws EncoderException
+     *             if the parameter supplied is not of type byte[]
+     */
+    public Object encode(Object pObject) throws EncoderException {
+        if (!(pObject instanceof byte[])) {
+            throw new EncoderException("Parameter supplied to Base-N encode is not a byte[]");
+        }
+        return encode((byte[]) pObject);
+    }
+
+    /**
+     * Encodes a byte[] containing binary data, into a String containing characters in the Base-N alphabet.
+     *
+     * @param pArray
+     *            a byte array containing binary data
+     * @return A String containing only Base-N character data
+     */
+    public String encodeToString(byte[] pArray) {
+        return StringUtils.newStringUtf8(encode(pArray));
+    }
+
+    /**
+     * Decodes an Object using the Base-N algorithm. This method is provided in order to satisfy the requirements of the
+     * Decoder interface, and will throw a DecoderException if the supplied object is not of type byte[] or String.
+     *
+     * @param pObject
+     *            Object to decode
+     * @return An object (of type byte[]) containing the binary data which corresponds to the byte[] or String supplied.
+     * @throws DecoderException
+     *             if the parameter supplied is not of type byte[]
+     */
+    public Object decode(Object pObject) throws DecoderException {        
+        if (pObject instanceof byte[]) {
+            return decode((byte[]) pObject);
+        } else if (pObject instanceof String) {
+            return decode((String) pObject);
+        } else {
+            throw new DecoderException("Parameter supplied to Base-N decode is not a byte[] or a String");
+        }
+    }
+
+    /**
+     * Decodes a String containing characters in the Base-N alphabet.
+     *
+     * @param pArray
+     *            A String containing Base-N character data
+     * @return a byte array containing binary data
+     */
+    public byte[] decode(String pArray) {
+        return decode(StringUtils.getBytesUtf8(pArray));
+    }
+
+    /**
+     * Decodes a byte[] containing characters in the Base-N alphabet.
+     * 
+     * @param pArray
+     *            A byte array containing Base-N character data
+     * @return a byte array containing binary data
+     */
+    public byte[] decode(byte[] pArray) {
+        reset();
+        if (pArray == null || pArray.length == 0) {
+            return pArray;
+        }
+        decode(pArray, 0, pArray.length);
+        decode(pArray, 0, -1); // Notify decoder of EOF.
+        byte[] result = new byte[pos];
+        readResults(result, 0, result.length);
+        return result;
+    }
+
+    /**
+     * Encodes a byte[] containing binary data, into a byte[] containing characters in the alphabet.
+     *
+     * @param pArray
+     *            a byte array containing binary data
+     * @return A byte array containing only the basen alphabetic character data
+     */
+    public byte[] encode(byte[] pArray) {
+        reset();        
+        if (pArray == null || pArray.length == 0) {
+            return pArray;
+        }
+        encode(pArray, 0, pArray.length);
+        encode(pArray, 0, -1); // Notify encoder of EOF.
+        byte[] buf = new byte[pos - readPos];
+        readResults(buf, 0, buf.length);
+        return buf;
+    }
+    
+    /**
+     * Encodes a byte[] containing binary data, into a String containing characters in the appropriate alphabet.
+     * Uses UTF8 encoding.
+     *
+     * @param pArray a byte array containing binary data
+     * @return String containing only character data in the appropriate alphabet.
+    */
+    public String encodeAsString(byte[] pArray){
+        return StringUtils.newStringUtf8(encode(pArray));
+    }
+
+    abstract void encode(byte[] pArray, int i, int length);  // package protected for access from I/O streams
+
+    abstract void decode(byte[] pArray, int i, int length); // package protected for access from I/O streams
+    
+    /**
+     * 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(byte[] arrayOctet, boolean allowWSPad) {
+        for (int i = 0; i < arrayOctet.length; i++) {
+            if (!isInAlphabet(arrayOctet[i]) &&
+                    (!allowWSPad || (arrayOctet[i] != PAD) && !isWhiteSpace(arrayOctet[i]))) {
+                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(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(byte[] arrayOctet) {
+        if (arrayOctet == null) {
+            return false;
+        }
+        for (int i = 0; i < arrayOctet.length; i++) {
+            if (PAD == arrayOctet[i] || isInAlphabet(arrayOctet[i])) {
+                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(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;
+    }
+}