1.9.10/src/java/org/codehaus/jackson/Base64Variant.java - jackson - Git at Google

 /* Jackson JSON-processor.
  *
  * Copyright (c) 2007- Tatu Saloranta, tatu.saloranta@iki.fi
  *
  * Licensed under the License specified in file LICENSE, included with
  * the source code and binary code bundles.
  * You may not use this file except in compliance with the License.
  *
  * 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.codehaus.jackson;

 import java.util.Arrays;

 /**
  * Abstract base class used to define specific details of which
  * variant of Base64 encoding/decoding is to be used. Although there is
  * somewhat standard basic version (so-called "MIME Base64"), other variants
  * exists, see <a href="http://en.wikipedia.org/wiki/Base64">Base64 Wikipedia entry</a> for details.
  *
  * @author Tatu Saloranta
  *
  * @since 0.9.3
  */
 public final class Base64Variant
 {
     /**
      * Placeholder used by "no padding" variant, to be used when a character
      * value is needed.
      */
     final static char PADDING_CHAR_NONE = '\0';

     /**
      * Marker used to denote ascii characters that do not correspond
      * to a 6-bit value (in this variant), and is not used as a padding
      * character.
      */
     public final static int BASE64_VALUE_INVALID = -1;

     /**
      * Marker used to denote ascii character (in decoding table) that
      * is the padding character using this variant (if any).
      */
     public final static int BASE64_VALUE_PADDING = -2;

     /*
     /**********************************************************
     /* Encoding/decoding tables
     /**********************************************************
      */

     /**
      * Decoding table used for base 64 decoding.
      */
     private final int[] _asciiToBase64 = new int[128];

     /**
      * Encoding table used for base 64 decoding when output is done
      * as characters.
      */
     private final char[] _base64ToAsciiC = new char[64];

     /**
      * Alternative encoding table used for base 64 decoding when output is done
      * as ascii bytes.
      */
     private final byte[] _base64ToAsciiB = new byte[64];

     /*
     /**********************************************************
     /* Other configuration
     /**********************************************************
      */

     /**
      * Symbolic name of variant; used for diagnostics/debugging.
      */
     final String _name;

     /**
      * Whether this variant uses padding or not.
      */
     final boolean _usesPadding;

     /**
      * Characted used for padding, if any ({@link #PADDING_CHAR_NONE} if not).
      */
     final char _paddingChar;

     /**
      * Maximum number of encoded base64 characters to output during encoding
      * before adding a linefeed, if line length is to be limited
      * ({@link java.lang.Integer#MAX_VALUE} if not limited).
      *<p>
      * Note: for some output modes (when writing attributes) linefeeds may
      * need to be avoided, and this value ignored.
      */
     final int _maxLineLength;

     /*
     /**********************************************************
     /* Life-cycle
     /**********************************************************
      */

     public Base64Variant(String name, String base64Alphabet, boolean usesPadding, char paddingChar, int maxLineLength)
     {
         _name = name;
         _usesPadding = usesPadding;
         _paddingChar = paddingChar;
         _maxLineLength = maxLineLength;

         // Ok and then we need to create codec tables.

         // First the main encoding table:
         int alphaLen = base64Alphabet.length();
         if (alphaLen != 64) {
             throw new IllegalArgumentException("Base64Alphabet length must be exactly 64 (was "+alphaLen+")");
         }

         // And then secondary encoding table and decoding table:
         base64Alphabet.getChars(0, alphaLen, _base64ToAsciiC, 0);
         Arrays.fill(_asciiToBase64, BASE64_VALUE_INVALID);
         for (int i = 0; i < alphaLen; ++i) {
             char alpha = _base64ToAsciiC[i];
             _base64ToAsciiB[i] = (byte) alpha;
             _asciiToBase64[alpha] = i;
         }

         // Plus if we use padding, add that in too
         if (usesPadding) {
             _asciiToBase64[(int) paddingChar] = BASE64_VALUE_PADDING;
         }
     }

     /**
      * "Copy constructor" that can be used when the base alphabet is identical
      * to one used by another variant except for the maximum line length
      * (and obviously, name).
      */
     public Base64Variant(Base64Variant base, String name, int maxLineLength)
     {
         this(base, name, base._usesPadding, base._paddingChar, maxLineLength);
     }

     /**
      * "Copy constructor" that can be used when the base alphabet is identical
      * to one used by another variant, but other details (padding, maximum
      * line length) differ
      */
     public Base64Variant(Base64Variant base, String name, boolean usesPadding, char paddingChar, int maxLineLength)
     {
         _name = name;
         byte[] srcB = base._base64ToAsciiB;
         System.arraycopy(srcB, 0, this._base64ToAsciiB, 0, srcB.length);
         char[] srcC = base._base64ToAsciiC;
         System.arraycopy(srcC, 0, this._base64ToAsciiC, 0, srcC.length);
         int[] srcV = base._asciiToBase64;
         System.arraycopy(srcV, 0, this._asciiToBase64, 0, srcV.length);

         _usesPadding = usesPadding;
         _paddingChar = paddingChar;
         _maxLineLength = maxLineLength;
     }

     /*
     /**********************************************************
     /* Public accessors
     /**********************************************************
      */

     public String getName() { return _name; }

     public boolean usesPadding() { return _usesPadding; }
     public boolean usesPaddingChar(char c) { return c == _paddingChar; }
     public boolean usesPaddingChar(int ch) { return ch == (int) _paddingChar; }
     public char getPaddingChar() { return _paddingChar; }
     public byte getPaddingByte() { return (byte)_paddingChar; }

     public int getMaxLineLength() { return _maxLineLength; }

     /*
     /**********************************************************
     /* Decoding support
     /**********************************************************
      */

     /**
      * @return 6-bit decoded value, if valid character;
      */
     public int decodeBase64Char(char c)
     {
         int ch = (int) c;
         return (ch <= 127) ? _asciiToBase64[ch] : BASE64_VALUE_INVALID;
     }

     public int decodeBase64Char(int ch)
     {
         return (ch <= 127) ? _asciiToBase64[ch] : BASE64_VALUE_INVALID;
     }

     public int decodeBase64Byte(byte b)
     {
         int ch = (int) b;
         return (ch <= 127) ? _asciiToBase64[ch] : BASE64_VALUE_INVALID;
     }

     /*
     /**********************************************************
     /* Encoding support
     /**********************************************************
      */

     public char encodeBase64BitsAsChar(int value)
     {
         /* Let's assume caller has done necessary checks; this
          * method must be fast and inlinable
          */
         return _base64ToAsciiC[value];
     }

     /**
      * Method that encodes given right-aligned (LSB) 24-bit value
      * into 4 base64 characters, stored in given result buffer.
      */
     public int encodeBase64Chunk(int b24, char[] buffer, int ptr)
     {
         buffer[ptr++] = _base64ToAsciiC[(b24 >> 18) & 0x3F];
         buffer[ptr++] = _base64ToAsciiC[(b24 >> 12) & 0x3F];
         buffer[ptr++] = _base64ToAsciiC[(b24 >> 6) & 0x3F];
         buffer[ptr++] = _base64ToAsciiC[b24 & 0x3F];
         return ptr;
     }

     public void encodeBase64Chunk(StringBuilder sb, int b24)
     {
         sb.append(_base64ToAsciiC[(b24 >> 18) & 0x3F]);
         sb.append(_base64ToAsciiC[(b24 >> 12) & 0x3F]);
         sb.append(_base64ToAsciiC[(b24 >> 6) & 0x3F]);
         sb.append(_base64ToAsciiC[b24 & 0x3F]);
     }

     /**
      * Method that outputs partial chunk (which only encodes one
      * or two bytes of data). Data given is still aligned same as if
      * it as full data; that is, missing data is at the "right end"
      * (LSB) of int.
      *
      * @param outputBytes Number of encoded bytes included (either 1 or 2)
      */
     public int encodeBase64Partial(int bits, int outputBytes, char[] buffer, int outPtr)
     {
         buffer[outPtr++] = _base64ToAsciiC[(bits >> 18) & 0x3F];
         buffer[outPtr++] = _base64ToAsciiC[(bits >> 12) & 0x3F];
         if (_usesPadding) {
             buffer[outPtr++] = (outputBytes == 2) ?
                 _base64ToAsciiC[(bits >> 6) & 0x3F] : _paddingChar;
             buffer[outPtr++] = _paddingChar;
         } else {
             if (outputBytes == 2) {
                 buffer[outPtr++] = _base64ToAsciiC[(bits >> 6) & 0x3F];
             }
         }
         return outPtr;
     }

     public void encodeBase64Partial(StringBuilder sb, int bits, int outputBytes)
     {
         sb.append(_base64ToAsciiC[(bits >> 18) & 0x3F]);
         sb.append(_base64ToAsciiC[(bits >> 12) & 0x3F]);
         if (_usesPadding) {
             sb.append((outputBytes == 2) ?
                       _base64ToAsciiC[(bits >> 6) & 0x3F] : _paddingChar);
             sb.append(_paddingChar);
         } else {
             if (outputBytes == 2) {
                 sb.append(_base64ToAsciiC[(bits >> 6) & 0x3F]);
             }
         }
     }

     public byte encodeBase64BitsAsByte(int value)
     {
         // As with above, assuming it is 6-bit value
         return _base64ToAsciiB[value];
     }

     /**
      * Method that encodes given right-aligned (LSB) 24-bit value
      * into 4 base64 bytes (ascii), stored in given result buffer.
      */
     public int encodeBase64Chunk(int b24, byte[] buffer, int ptr)
     {
         buffer[ptr++] = _base64ToAsciiB[(b24 >> 18) & 0x3F];
         buffer[ptr++] = _base64ToAsciiB[(b24 >> 12) & 0x3F];
         buffer[ptr++] = _base64ToAsciiB[(b24 >> 6) & 0x3F];
         buffer[ptr++] = _base64ToAsciiB[b24 & 0x3F];
         return ptr;
     }

     /**
      * Method that outputs partial chunk (which only encodes one
      * or two bytes of data). Data given is still aligned same as if
      * it as full data; that is, missing data is at the "right end"
      * (LSB) of int.
      *
      * @param outputBytes Number of encoded bytes included (either 1 or 2)
      */
     public int encodeBase64Partial(int bits, int outputBytes, byte[] buffer, int outPtr)
     {
         buffer[outPtr++] = _base64ToAsciiB[(bits >> 18) & 0x3F];
         buffer[outPtr++] = _base64ToAsciiB[(bits >> 12) & 0x3F];
         if (_usesPadding) {
             byte pb = (byte) _paddingChar;
             buffer[outPtr++] = (outputBytes == 2) ?
                 _base64ToAsciiB[(bits >> 6) & 0x3F] : pb;
             buffer[outPtr++] = pb;
         } else {
             if (outputBytes == 2) {
                 buffer[outPtr++] = _base64ToAsciiB[(bits >> 6) & 0x3F];
             }
         }
         return outPtr;
     }

     /**
      * Convenience method for converting given byte array as base64 encoded
      * String using this variant's settings.
      * Resulting value is "raw", that is, not enclosed in double-quotes.
      *
      * @param input Byte array to encode
      *
      * @since 1.6
      */
     public String encode(byte[] input)
     {
         return encode(input, false);
     }

     /**
      * Convenience method for converting given byte array as base64 encoded
      * String using this variant's settings, optionally enclosed in
      * double-quotes.
      *
      * @param input Byte array to encode
      * @param addQuotes Whether to surround resulting value in double quotes
      *   or not
      *
      * @since 1.6
      */
     public String encode(byte[] input, boolean addQuotes)
     {
         int inputEnd = input.length;
         StringBuilder sb;
         {
             // let's approximate... 33% overhead, ~= 3/8 (0.375)
             int outputLen = inputEnd + (inputEnd >> 2) + (inputEnd >> 3);
             sb = new StringBuilder(outputLen);
         }
         if (addQuotes) {
             sb.append('"');
         }

         int chunksBeforeLF = getMaxLineLength() >> 2;

         // Ok, first we loop through all full triplets of data:
         int inputPtr = 0;
         int safeInputEnd = inputEnd-3; // to get only full triplets

         while (inputPtr <= safeInputEnd) {
             // First, mash 3 bytes into lsb of 32-bit int
             int b24 = ((int) input[inputPtr++]) << 8;
             b24 |= ((int) input[inputPtr++]) & 0xFF;
             b24 = (b24 << 8) | (((int) input[inputPtr++]) & 0xFF);
             encodeBase64Chunk(sb, b24);
             if (--chunksBeforeLF <= 0) {
                 // note: must quote in JSON value, so not really useful...
                 sb.append('\\');
                 sb.append('n');
                 chunksBeforeLF = getMaxLineLength() >> 2;
             }
         }

         // And then we may have 1 or 2 leftover bytes to encode
         int inputLeft = inputEnd - inputPtr; // 0, 1 or 2
         if (inputLeft > 0) { // yes, but do we have room for output?
             int b24 = ((int) input[inputPtr++]) << 16;
             if (inputLeft == 2) {
                 b24 |= (((int) input[inputPtr++]) & 0xFF) << 8;
             }
             encodeBase64Partial(sb, b24, inputLeft);
         }

         if (addQuotes) {
             sb.append('"');
         }
         return sb.toString();
     }

     /*
     /**********************************************************
     /* other methods
     /**********************************************************
      */

     @Override
     public String toString() { return _name; }
 }
	/* Jackson JSON-processor.
	*
	* Copyright (c) 2007- Tatu Saloranta, tatu.saloranta@iki.fi
	*
	* Licensed under the License specified in file LICENSE, included with
	* the source code and binary code bundles.
	* You may not use this file except in compliance with the License.
	*
	* 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.codehaus.jackson;

	import java.util.Arrays;

	/**
	* Abstract base class used to define specific details of which
	* variant of Base64 encoding/decoding is to be used. Although there is
	* somewhat standard basic version (so-called "MIME Base64"), other variants
	* exists, see <a href="http://en.wikipedia.org/wiki/Base64">Base64 Wikipedia entry</a> for details.
	*
	* @author Tatu Saloranta
	*
	* @since 0.9.3
	*/
	public final class Base64Variant
	{
	/**
	* Placeholder used by "no padding" variant, to be used when a character
	* value is needed.
	*/
	final static char PADDING_CHAR_NONE = '\0';

	/**
	* Marker used to denote ascii characters that do not correspond
	* to a 6-bit value (in this variant), and is not used as a padding
	* character.
	*/
	public final static int BASE64_VALUE_INVALID = -1;

	/**
	* Marker used to denote ascii character (in decoding table) that
	* is the padding character using this variant (if any).
	*/
	public final static int BASE64_VALUE_PADDING = -2;

	/*
	/**********************************************************
	/* Encoding/decoding tables
	/**********************************************************
	*/

	/**
	* Decoding table used for base 64 decoding.
	*/
	private final int[] _asciiToBase64 = new int[128];

	/**
	* Encoding table used for base 64 decoding when output is done
	* as characters.
	*/
	private final char[] _base64ToAsciiC = new char[64];

	/**
	* Alternative encoding table used for base 64 decoding when output is done
	* as ascii bytes.
	*/
	private final byte[] _base64ToAsciiB = new byte[64];

	/*
	/**********************************************************
	/* Other configuration
	/**********************************************************
	*/

	/**
	* Symbolic name of variant; used for diagnostics/debugging.
	*/
	final String _name;

	/**
	* Whether this variant uses padding or not.
	*/
	final boolean _usesPadding;

	/**
	* Characted used for padding, if any ({@link #PADDING_CHAR_NONE} if not).
	*/
	final char _paddingChar;

	/**
	* Maximum number of encoded base64 characters to output during encoding
	* before adding a linefeed, if line length is to be limited
	* ({@link java.lang.Integer#MAX_VALUE} if not limited).
	*<p>
	* Note: for some output modes (when writing attributes) linefeeds may
	* need to be avoided, and this value ignored.
	*/
	final int _maxLineLength;

	/*
	/**********************************************************
	/* Life-cycle
	/**********************************************************
	*/

	public Base64Variant(String name, String base64Alphabet, boolean usesPadding, char paddingChar, int maxLineLength)
	{
	_name = name;
	_usesPadding = usesPadding;
	_paddingChar = paddingChar;
	_maxLineLength = maxLineLength;

	// Ok and then we need to create codec tables.

	// First the main encoding table:
	int alphaLen = base64Alphabet.length();
	if (alphaLen != 64) {
	throw new IllegalArgumentException("Base64Alphabet length must be exactly 64 (was "+alphaLen+")");
	}

	// And then secondary encoding table and decoding table:
	base64Alphabet.getChars(0, alphaLen, _base64ToAsciiC, 0);
	Arrays.fill(_asciiToBase64, BASE64_VALUE_INVALID);
	for (int i = 0; i < alphaLen; ++i) {
	char alpha = _base64ToAsciiC[i];
	_base64ToAsciiB[i] = (byte) alpha;
	_asciiToBase64[alpha] = i;
	}

	// Plus if we use padding, add that in too
	if (usesPadding) {
	_asciiToBase64[(int) paddingChar] = BASE64_VALUE_PADDING;
	}
	}

	/**
	* "Copy constructor" that can be used when the base alphabet is identical
	* to one used by another variant except for the maximum line length
	* (and obviously, name).
	*/
	public Base64Variant(Base64Variant base, String name, int maxLineLength)
	{
	this(base, name, base._usesPadding, base._paddingChar, maxLineLength);
	}

	/**
	* "Copy constructor" that can be used when the base alphabet is identical
	* to one used by another variant, but other details (padding, maximum
	* line length) differ
	*/
	public Base64Variant(Base64Variant base, String name, boolean usesPadding, char paddingChar, int maxLineLength)
	{
	_name = name;
	byte[] srcB = base._base64ToAsciiB;
	System.arraycopy(srcB, 0, this._base64ToAsciiB, 0, srcB.length);
	char[] srcC = base._base64ToAsciiC;
	System.arraycopy(srcC, 0, this._base64ToAsciiC, 0, srcC.length);
	int[] srcV = base._asciiToBase64;
	System.arraycopy(srcV, 0, this._asciiToBase64, 0, srcV.length);

	_usesPadding = usesPadding;
	_paddingChar = paddingChar;
	_maxLineLength = maxLineLength;
	}

	/*
	/**********************************************************
	/* Public accessors
	/**********************************************************
	*/

	public String getName() { return _name; }

	public boolean usesPadding() { return _usesPadding; }
	public boolean usesPaddingChar(char c) { return c == _paddingChar; }
	public boolean usesPaddingChar(int ch) { return ch == (int) _paddingChar; }
	public char getPaddingChar() { return _paddingChar; }
	public byte getPaddingByte() { return (byte)_paddingChar; }

	public int getMaxLineLength() { return _maxLineLength; }

	/*
	/**********************************************************
	/* Decoding support
	/**********************************************************
	*/

	/**
	* @return 6-bit decoded value, if valid character;
	*/
	public int decodeBase64Char(char c)
	{
	int ch = (int) c;
	return (ch <= 127) ? _asciiToBase64[ch] : BASE64_VALUE_INVALID;
	}

	public int decodeBase64Char(int ch)
	{
	return (ch <= 127) ? _asciiToBase64[ch] : BASE64_VALUE_INVALID;
	}

	public int decodeBase64Byte(byte b)
	{
	int ch = (int) b;
	return (ch <= 127) ? _asciiToBase64[ch] : BASE64_VALUE_INVALID;
	}

	/*
	/**********************************************************
	/* Encoding support
	/**********************************************************
	*/

	public char encodeBase64BitsAsChar(int value)
	{
	/* Let's assume caller has done necessary checks; this
	* method must be fast and inlinable
	*/
	return _base64ToAsciiC[value];
	}

	/**
	* Method that encodes given right-aligned (LSB) 24-bit value
	* into 4 base64 characters, stored in given result buffer.
	*/
	public int encodeBase64Chunk(int b24, char[] buffer, int ptr)
	{
	buffer[ptr++] = _base64ToAsciiC[(b24 >> 18) & 0x3F];
	buffer[ptr++] = _base64ToAsciiC[(b24 >> 12) & 0x3F];
	buffer[ptr++] = _base64ToAsciiC[(b24 >> 6) & 0x3F];
	buffer[ptr++] = _base64ToAsciiC[b24 & 0x3F];
	return ptr;
	}

	public void encodeBase64Chunk(StringBuilder sb, int b24)
	{
	sb.append(_base64ToAsciiC[(b24 >> 18) & 0x3F]);
	sb.append(_base64ToAsciiC[(b24 >> 12) & 0x3F]);
	sb.append(_base64ToAsciiC[(b24 >> 6) & 0x3F]);
	sb.append(_base64ToAsciiC[b24 & 0x3F]);
	}

	/**
	* Method that outputs partial chunk (which only encodes one
	* or two bytes of data). Data given is still aligned same as if
	* it as full data; that is, missing data is at the "right end"
	* (LSB) of int.
	*
	* @param outputBytes Number of encoded bytes included (either 1 or 2)
	*/
	public int encodeBase64Partial(int bits, int outputBytes, char[] buffer, int outPtr)
	{
	buffer[outPtr++] = _base64ToAsciiC[(bits >> 18) & 0x3F];
	buffer[outPtr++] = _base64ToAsciiC[(bits >> 12) & 0x3F];
	if (_usesPadding) {
	buffer[outPtr++] = (outputBytes == 2) ?
	_base64ToAsciiC[(bits >> 6) & 0x3F] : _paddingChar;
	buffer[outPtr++] = _paddingChar;
	} else {
	if (outputBytes == 2) {
	buffer[outPtr++] = _base64ToAsciiC[(bits >> 6) & 0x3F];
	}
	}
	return outPtr;
	}

	public void encodeBase64Partial(StringBuilder sb, int bits, int outputBytes)
	{
	sb.append(_base64ToAsciiC[(bits >> 18) & 0x3F]);
	sb.append(_base64ToAsciiC[(bits >> 12) & 0x3F]);
	if (_usesPadding) {
	sb.append((outputBytes == 2) ?
	_base64ToAsciiC[(bits >> 6) & 0x3F] : _paddingChar);
	sb.append(_paddingChar);
	} else {
	if (outputBytes == 2) {
	sb.append(_base64ToAsciiC[(bits >> 6) & 0x3F]);
	}
	}
	}

	public byte encodeBase64BitsAsByte(int value)
	{
	// As with above, assuming it is 6-bit value
	return _base64ToAsciiB[value];
	}

	/**
	* Method that encodes given right-aligned (LSB) 24-bit value
	* into 4 base64 bytes (ascii), stored in given result buffer.
	*/
	public int encodeBase64Chunk(int b24, byte[] buffer, int ptr)
	{
	buffer[ptr++] = _base64ToAsciiB[(b24 >> 18) & 0x3F];
	buffer[ptr++] = _base64ToAsciiB[(b24 >> 12) & 0x3F];
	buffer[ptr++] = _base64ToAsciiB[(b24 >> 6) & 0x3F];
	buffer[ptr++] = _base64ToAsciiB[b24 & 0x3F];
	return ptr;
	}

	/**
	* Method that outputs partial chunk (which only encodes one
	* or two bytes of data). Data given is still aligned same as if
	* it as full data; that is, missing data is at the "right end"
	* (LSB) of int.
	*
	* @param outputBytes Number of encoded bytes included (either 1 or 2)
	*/
	public int encodeBase64Partial(int bits, int outputBytes, byte[] buffer, int outPtr)
	{
	buffer[outPtr++] = _base64ToAsciiB[(bits >> 18) & 0x3F];
	buffer[outPtr++] = _base64ToAsciiB[(bits >> 12) & 0x3F];
	if (_usesPadding) {
	byte pb = (byte) _paddingChar;
	buffer[outPtr++] = (outputBytes == 2) ?
	_base64ToAsciiB[(bits >> 6) & 0x3F] : pb;
	buffer[outPtr++] = pb;
	} else {
	if (outputBytes == 2) {
	buffer[outPtr++] = _base64ToAsciiB[(bits >> 6) & 0x3F];
	}
	}
	return outPtr;
	}

	/**
	* Convenience method for converting given byte array as base64 encoded
	* String using this variant's settings.
	* Resulting value is "raw", that is, not enclosed in double-quotes.
	*
	* @param input Byte array to encode
	*
	* @since 1.6
	*/
	public String encode(byte[] input)
	{
	return encode(input, false);
	}

	/**
	* Convenience method for converting given byte array as base64 encoded
	* String using this variant's settings, optionally enclosed in
	* double-quotes.
	*
	* @param input Byte array to encode
	* @param addQuotes Whether to surround resulting value in double quotes
	* or not
	*
	* @since 1.6
	*/
	public String encode(byte[] input, boolean addQuotes)
	{
	int inputEnd = input.length;
	StringBuilder sb;
	{
	// let's approximate... 33% overhead, ~= 3/8 (0.375)
	int outputLen = inputEnd + (inputEnd >> 2) + (inputEnd >> 3);
	sb = new StringBuilder(outputLen);
	}
	if (addQuotes) {
	sb.append('"');
	}

	int chunksBeforeLF = getMaxLineLength() >> 2;

	// Ok, first we loop through all full triplets of data:
	int inputPtr = 0;
	int safeInputEnd = inputEnd-3; // to get only full triplets

	while (inputPtr <= safeInputEnd) {
	// First, mash 3 bytes into lsb of 32-bit int
	int b24 = ((int) input[inputPtr++]) << 8;
	b24 \|= ((int) input[inputPtr++]) & 0xFF;
	b24 = (b24 << 8) \| (((int) input[inputPtr++]) & 0xFF);
	encodeBase64Chunk(sb, b24);
	if (--chunksBeforeLF <= 0) {
	// note: must quote in JSON value, so not really useful...
	sb.append('\\');
	sb.append('n');
	chunksBeforeLF = getMaxLineLength() >> 2;
	}
	}

	// And then we may have 1 or 2 leftover bytes to encode
	int inputLeft = inputEnd - inputPtr; // 0, 1 or 2
	if (inputLeft > 0) { // yes, but do we have room for output?
	int b24 = ((int) input[inputPtr++]) << 16;
	if (inputLeft == 2) {
	b24 \|= (((int) input[inputPtr++]) & 0xFF) << 8;
	}
	encodeBase64Partial(sb, b24, inputLeft);
	}

	if (addQuotes) {
	sb.append('"');
	}
	return sb.toString();
	}

	/*
	/**********************************************************
	/* other methods
	/**********************************************************
	*/

	@Override
	public String toString() { return _name; }
	}