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/*
 * Copyright 2005-2014 Red Hat, Inc.
 * Red Hat 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.hornetq.utils;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;

/**
 * 

Encodes and decodes to and from Base64 notation.

*

Homepage: http://iharder.net/base64.

*

The options parameter, which appears in a few places, is used to pass * several pieces of information to the encoder. In the "higher level" methods such as * encodeBytes( bytes, options ) the options parameter can be used to indicate such * things as first gzipping the bytes before encoding them, not inserting linefeeds * (though that breaks strict Base64 compatibility), and encoding using the URL-safe * and Ordered dialects.

*

The constants defined in Base64 can be OR-ed together to combine options, so you * might make a call like this:

*

* String encoded = Base64.encodeBytes( mybytes, Base64.GZIP | Base64.DONT_BREAK_LINES ); *

*

to compress the data before encoding it and then making the output have no newline characters.

*

* Change Log: *

*
    *
  • v2.2.2 - Fixed encodeFileToFile and decodeFileToFile to use the * Base64.InputStream class to encode and decode on the fly which uses * less memory than encoding/decoding an entire file into memory before writing.
  • *
  • v2.2.1 - Fixed bug using URL_SAFE and ORDERED encodings. Fixed bug * when using very small files (~< 40 bytes).
  • *
  • v2.2 - Added some helper methods for encoding/decoding directly from * one file to the next. Also added a main() method to support command line * encoding/decoding from one file to the next. Also added these Base64 dialects: *
      *
    1. The default is RFC3548 format.
    2. *
    3. Calling Base64.setFormat(Base64.BASE64_FORMAT.URLSAFE_FORMAT) generates * URL and file name friendly format as described in Section 4 of RFC3548. * http://www.faqs.org/rfcs/rfc3548.html
    4. *
    5. Calling Base64.setFormat(Base64.BASE64_FORMAT.ORDERED_FORMAT) generates * URL and file name friendly format that preserves lexical ordering as described * in http://www.faqs.org/qa/rfcc-1940.html
    6. *
    * Special thanks to Jim Kellerman at http://www.powerset.com/ * for contributing the new Base64 dialects. *
  • *
  • v2.1 - Cleaned up javadoc comments and unused variables and methods. Added * some convenience methods for reading and writing to and from files.
  • *
  • v2.0.2 - Now specifies UTF-8 encoding in places where the code fails on systems * with other encodings (like EBCDIC).
  • *
  • v2.0.1 - Fixed an error when decoding a single byte, that is, when the * encoded data was a single byte.
  • *
  • v2.0 - I got rid of methods that used booleans to set options. * Now everything is more consolidated and cleaner. The code now detects * when data that's being decoded is gzip-compressed and will decompress it * automatically. Generally things are cleaner. You'll probably have to * change some method calls that you were making to support the new * options format (ints that you "OR" together).
  • *
  • v1.5.1 - Fixed bug when decompressing and decoding to a * byte[] using decode( String s, boolean gzipCompressed ). * Added the ability to "suspend" encoding in the Output Stream so * you can turn on and off the encoding if you need to embed base64 * data in an otherwise "normal" stream (like an XML file).
  • *
  • v1.5 - Output stream pases on flush() command but doesn't do anything itself. * This helps when using GZIP streams. * Added the ability to GZip-compress objects before encoding them.
  • *
  • v1.4 - Added helper methods to read/write files.
  • *
  • v1.3.6 - Fixed OutputStream.flush() so that 'position' is reset.
  • *
  • v1.3.5 - Added flag to turn on and off line breaks. Fixed bug in input stream * where last buffer being read, if not completely full, was not returned.
  • *
  • v1.3.4 - Fixed when "improperly padded stream" error was thrown at the wrong time.
  • *
  • v1.3.3 - Fixed I/O streams which were totally messed up.
  • *
*

* I am placing this code in the Public Domain. Do with it as you will. * This software comes with no guarantees or warranties but with * plenty of well-wishing instead! * Please visit http://iharder.net/base64 * periodically to check for updates or to contribute improvements. *

* * @author Robert Harder * @author [email protected] * @version 2.2.2 */ public class Base64 { /* ******** P U B L I C F I E L D S ******** */ /** * No options specified. Value is zero. */ public static final int NO_OPTIONS = 0; /** * Specify encoding. */ public static final int ENCODE = 1; /** * Specify decoding. */ public static final int DECODE = 0; /** * Specify that data should be gzip-compressed. */ public static final int GZIP = 2; /** * Don't break lines when encoding (violates strict Base64 specification) */ public static final int DONT_BREAK_LINES = 8; /** * Encode using Base64-like encoding that is URL- and Filename-safe as described * in Section 4 of RFC3548: * http://www.faqs.org/rfcs/rfc3548.html. * It is important to note that data encoded this way is not officially valid Base64, * or at the very least should not be called Base64 without also specifying that is * was encoded using the URL- and Filename-safe dialect. */ public static final int URL_SAFE = 16; /** * Encode using the special "ordered" dialect of Base64 described here: * http://www.faqs.org/qa/rfcc-1940.html. */ public static final int ORDERED = 32; /* ******** P R I V A T E F I E L D S ******** */ /** * Maximum line length (76) of Base64 output. */ private static final int MAX_LINE_LENGTH = 76; /** * The equals sign (=) as a byte. */ private static final byte EQUALS_SIGN = (byte) '='; /** * The new line character (\n) as a byte. */ private static final byte NEW_LINE = (byte) '\n'; /** * Preferred encoding. */ private static final Charset PREFERRED_ENCODING = StandardCharsets.UTF_8; // I think I end up not using the BAD_ENCODING indicator. // private final static byte BAD_ENCODING = -9; // Indicates error in encoding private static final byte WHITE_SPACE_ENC = -5; // Indicates white space in encoding private static final byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in encoding /* ******** S T A N D A R D B A S E 6 4 A L P H A B E T ******** */ /** * The 64 valid Base64 values. */ // private final static byte[] ALPHABET; /* Host platform me be something funny like EBCDIC, so we hardcode these values. */ private static final byte[] _STANDARD_ALPHABET = {(byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z', (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) '+', (byte) '/'}; /** * Translates a Base64 value to either its 6-bit reconstruction value * or a negative number indicating some other meaning. */ private static final byte[] _STANDARD_DECODABET = { -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 0 - 8 -5, -5, // Whitespace: Tab and Linefeed -9, -9, // Decimal 11 - 12 -5, // Whitespace: Carriage Return -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - 26 -9, -9, -9, -9, -9, // Decimal 27 - 31 -5, // Whitespace: Space -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42 62, // Plus sign at decimal 43 -9, -9, -9, // Decimal 44 - 46 63, // Slash at decimal 47 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine -9, -9, -9, // Decimal 58 - 60 -1, // Equals sign at decimal 61 -9, -9, -9, // Decimal 62 - 64 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, // Letters 'A' through 'N' 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // Letters 'O' through 'Z' -9, -9, -9, -9, -9, -9, // Decimal 91 - 96 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' through 'm' 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' through 'z' -9, -9, -9, -9 // Decimal 123 - 126 /*,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 127 - 139 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255 */ }; /* ******** U R L S A F E B A S E 6 4 A L P H A B E T ******** */ /** * Used in the URL- and Filename-safe dialect described in Section 4 of RFC3548: * http://www.faqs.org/rfcs/rfc3548.html. * Notice that the last two bytes become "hyphen" and "underscore" instead of "plus" and "slash." */ private static final byte[] _URL_SAFE_ALPHABET = { (byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z', (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) '-', (byte) '_'}; /** * Used in decoding URL- and Filename-safe dialects of Base64. */ private static final byte[] _URL_SAFE_DECODABET = { -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 0 - 8 -5, -5, // Whitespace: Tab and Linefeed -9, -9, // Decimal 11 - 12 -5, // Whitespace: Carriage Return -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - 26 -9, -9, -9, -9, -9, // Decimal 27 - 31 -5, // Whitespace: Space -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42 -9, // Plus sign at decimal 43 -9, // Decimal 44 62, // Minus sign at decimal 45 -9, // Decimal 46 -9, // Slash at decimal 47 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine -9, -9, -9, // Decimal 58 - 60 -1, // Equals sign at decimal 61 -9, -9, -9, // Decimal 62 - 64 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, // Letters 'A' through 'N' 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // Letters 'O' through 'Z' -9, -9, -9, -9, // Decimal 91 - 94 63, // Underscore at decimal 95 -9, // Decimal 96 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' through 'm' 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' through 'z' -9, -9, -9, -9 // Decimal 123 - 126 /*,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 127 - 139 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255 */ }; /* ******** O R D E R E D B A S E 6 4 A L P H A B E T ******** */ /** * I don't get the point of this technique, but it is described here: * http://www.faqs.org/qa/rfcc-1940.html. */ private static final byte[] _ORDERED_ALPHABET = { (byte) '-', (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) '_', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z'}; /** * Used in decoding the "ordered" dialect of Base64. */ private static final byte[] _ORDERED_DECODABET = { -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 0 - 8 -5, -5, // Whitespace: Tab and Linefeed -9, -9, // Decimal 11 - 12 -5, // Whitespace: Carriage Return -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - 26 -9, -9, -9, -9, -9, // Decimal 27 - 31 -5, // Whitespace: Space -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42 -9, // Plus sign at decimal 43 -9, // Decimal 44 0, // Minus sign at decimal 45 -9, // Decimal 46 -9, // Slash at decimal 47 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, // Numbers zero through nine -9, -9, -9, // Decimal 58 - 60 -1, // Equals sign at decimal 61 -9, -9, -9, // Decimal 62 - 64 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, // Letters 'A' through 'M' 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, // Letters 'N' through 'Z' -9, -9, -9, -9, // Decimal 91 - 94 37, // Underscore at decimal 95 -9, // Decimal 96 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, // Letters 'a' through 'm' 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, // Letters 'n' through 'z' -9, -9, -9, -9 // Decimal 123 - 126 /*,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 127 - 139 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 140 - 152 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 153 - 165 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 166 - 178 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 179 - 191 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 192 - 204 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 205 - 217 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 218 - 230 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9, // Decimal 231 - 243 -9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9,-9 // Decimal 244 - 255 */ }; /* ******** D E T E R M I N E W H I C H A L H A B E T ******** */ /** * Returns one of the _SOMETHING_ALPHABET byte arrays depending on * the options specified. * It's possible, though silly, to specify ORDERED and URLSAFE * in which case one of them will be picked, though there is * no guarantee as to which one will be picked. */ private static byte[] getAlphabet(final int options) { if ((options & Base64.URL_SAFE) == Base64.URL_SAFE) { return Base64._URL_SAFE_ALPHABET; } else if ((options & Base64.ORDERED) == Base64.ORDERED) { return Base64._ORDERED_ALPHABET; } else { return Base64._STANDARD_ALPHABET; } } // end getAlphabet /** * Returns one of the _SOMETHING_DECODABET byte arrays depending on * the options specified. * It's possible, though silly, to specify ORDERED and URL_SAFE * in which case one of them will be picked, though there is * no guarantee as to which one will be picked. */ private static byte[] getDecodabet(final int options) { if ((options & Base64.URL_SAFE) == Base64.URL_SAFE) { return Base64._URL_SAFE_DECODABET; } else if ((options & Base64.ORDERED) == Base64.ORDERED) { return Base64._ORDERED_DECODABET; } else { return Base64._STANDARD_DECODABET; } } // end getAlphabet /** * Defeats instantiation. */ private Base64() { } /** * Encodes or decodes two files from the command line; * feel free to delete this method (in fact you probably should) * if you're embedding this code into a larger program. */ public static final void main(final String[] args) { if (args.length < 3) { Base64.usage("Not enough arguments."); } // end if: args.length < 3 else { String flag = args[0]; String infile = args[1]; String outfile = args[2]; if (flag.equals("-e")) { Base64.encodeFileToFile(infile, outfile); } // end if: encode else if (flag.equals("-d")) { Base64.decodeFileToFile(infile, outfile); } // end else if: decode else { Base64.usage("Unknown flag: " + flag); } // end else } // end else } // end main /** * Prints command line usage. * * @param msg A message to include with usage info. */ private static void usage(final String msg) { System.err.println(msg); System.err.println("Usage: java Base64 -e|-d inputfile outputfile"); } // end usage /* ******** E N C O D I N G M E T H O D S ******** */ /** * Encodes up to the first three bytes of array threeBytes * and returns a four-byte array in Base64 notation. * The actual number of significant bytes in your array is * given by numSigBytes. * The array threeBytes needs only be as big as * numSigBytes. * Code can reuse a byte array by passing a four-byte array as b4. * * @param b4 A reusable byte array to reduce array instantiation * @param threeBytes the array to convert * @param numSigBytes the number of significant bytes in your array * @return four byte array in Base64 notation. * @since 1.5.1 */ private static byte[] encode3to4(final byte[] b4, final byte[] threeBytes, final int numSigBytes, final int options) { Base64.encode3to4(threeBytes, 0, numSigBytes, b4, 0, options); return b4; } // end encode3to4 /** *

Encodes up to three bytes of the array source * and writes the resulting four Base64 bytes to destination. * The source and destination arrays can be manipulated * anywhere along their length by specifying * srcOffset and destOffset. * This method does not check to make sure your arrays * are large enough to accommodate srcOffset + 3 for * the source array or destOffset + 4 for * the destination array. * The actual number of significant bytes in your array is * given by numSigBytes.

*

This is the lowest level of the encoding methods with * all possible parameters.

* * @param source the array to convert * @param srcOffset the index where conversion begins * @param numSigBytes the number of significant bytes in your array * @param destination the array to hold the conversion * @param destOffset the index where output will be put * @return the destination array * @since 1.3 */ private static byte[] encode3to4(final byte[] source, final int srcOffset, final int numSigBytes, final byte[] destination, final int destOffset, final int options) { byte[] ALPHABET = Base64.getAlphabet(options); // 1 2 3 // 01234567890123456789012345678901 Bit position // --------000000001111111122222222 Array position from threeBytes // --------| || || || | Six bit groups to index ALPHABET // >>18 >>12 >> 6 >> 0 Right shift necessary // 0x3f 0x3f 0x3f Additional AND // Create buffer with zero-padding if there are only one or two // significant bytes passed in the array. // We have to shift left 24 in order to flush out the 1's that appear // when Java treats a value as negative that is cast from a byte to an int. int inBuff = (numSigBytes > 0 ? source[srcOffset] << 24 >>> 8 : 0) | (numSigBytes > 1 ? source[srcOffset + 1] << 24 >>> 16 : 0) | (numSigBytes > 2 ? source[srcOffset + 2] << 24 >>> 24 : 0); switch (numSigBytes) { case 3: destination[destOffset] = ALPHABET[(inBuff >>> 18)]; destination[destOffset + 1] = ALPHABET[inBuff >>> 12 & 0x3f]; destination[destOffset + 2] = ALPHABET[inBuff >>> 6 & 0x3f]; destination[destOffset + 3] = ALPHABET[inBuff & 0x3f]; return destination; case 2: destination[destOffset] = ALPHABET[(inBuff >>> 18)]; destination[destOffset + 1] = ALPHABET[inBuff >>> 12 & 0x3f]; destination[destOffset + 2] = ALPHABET[inBuff >>> 6 & 0x3f]; destination[destOffset + 3] = Base64.EQUALS_SIGN; return destination; case 1: destination[destOffset] = ALPHABET[(inBuff >>> 18)]; destination[destOffset + 1] = ALPHABET[inBuff >>> 12 & 0x3f]; destination[destOffset + 2] = Base64.EQUALS_SIGN; destination[destOffset + 3] = Base64.EQUALS_SIGN; return destination; default: return destination; } // end switch } // end encode3to4 /** * Serializes an object and returns the Base64-encoded * version of that serialized object. If the object * cannot be serialized or there is another error, * the method will return null. * The object is not GZip-compressed before being encoded. * * @param serializableObject The object to encode * @return The Base64-encoded object * @since 1.4 */ public static String encodeObject(final java.io.Serializable serializableObject) { return Base64.encodeObject(serializableObject, Base64.NO_OPTIONS); } // end encodeObject /** * Serializes an object and returns the Base64-encoded * version of that serialized object. If the object * cannot be serialized or there is another error, * the method will return null. *

* Valid options:

    *   GZIP: gzip-compresses object before encoding it.
    *   DONT_BREAK_LINES: don't break lines at 76 characters
    *     Note: Technically, this makes your encoding non-compliant.
    * 
*

* Example: encodeObject( myObj, Base64.GZIP ) or *

* Example: encodeObject( myObj, Base64.GZIP | Base64.DONT_BREAK_LINES ) * * @param serializableObject The object to encode * @param options Specified options * @return The Base64-encoded object * @see Base64#GZIP * @see Base64#DONT_BREAK_LINES * @since 2.0 */ public static String encodeObject(final java.io.Serializable serializableObject, final int options) { // Streams java.io.ByteArrayOutputStream baos = null; java.io.OutputStream b64os = null; java.io.ObjectOutputStream oos = null; java.util.zip.GZIPOutputStream gzos = null; // Isolate options int gzip = options & Base64.GZIP; try { // ObjectOutputStream -> (GZIP) -> Base64 -> ByteArrayOutputStream baos = new java.io.ByteArrayOutputStream(); b64os = new Base64.OutputStream(baos, Base64.ENCODE | options); // GZip? if (gzip == Base64.GZIP) { gzos = new java.util.zip.GZIPOutputStream(b64os); oos = new java.io.ObjectOutputStream(gzos); } // end if: gzip else { oos = new java.io.ObjectOutputStream(b64os); } oos.writeObject(serializableObject); } // end try catch (java.io.IOException e) { e.printStackTrace(); return null; } // end catch finally { try { oos.close(); } catch (Exception e) { } try { gzos.close(); } catch (Exception e) { } try { b64os.close(); } catch (Exception e) { } try { baos.close(); } catch (Exception e) { } } // end finally // Return value according to relevant encoding. return new String(baos.toByteArray(), Base64.PREFERRED_ENCODING); } // end encode /** * Encodes a byte array into Base64 notation. * Does not GZip-compress data. * * @param source The data to convert * @since 1.4 */ public static String encodeBytes(final byte[] source) { return Base64.encodeBytes(source, 0, source.length, Base64.NO_OPTIONS); } // end encodeBytes /** * Encodes a byte array into Base64 notation. *

* Valid options:

    *   GZIP: gzip-compresses object before encoding it.
    *   DONT_BREAK_LINES: don't break lines at 76 characters
    *     Note: Technically, this makes your encoding non-compliant.
    * 
*

* Example: encodeBytes( myData, Base64.GZIP ) or *

* Example: encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES ) * * @param source The data to convert * @param options Specified options * @see Base64#GZIP * @see Base64#DONT_BREAK_LINES * @since 2.0 */ public static String encodeBytes(final byte[] source, final int options) { return Base64.encodeBytes(source, 0, source.length, options); } // end encodeBytes /** * Encodes a byte array into Base64 notation. * Does not GZip-compress data. * * @param source The data to convert * @param off Offset in array where conversion should begin * @param len Length of data to convert * @since 1.4 */ public static String encodeBytes(final byte[] source, final int off, final int len) { return Base64.encodeBytes(source, off, len, Base64.NO_OPTIONS); } // end encodeBytes /** * Encodes a byte array into Base64 notation. *

* Valid options:

    *   GZIP: gzip-compresses object before encoding it.
    *   DONT_BREAK_LINES: don't break lines at 76 characters
    *     Note: Technically, this makes your encoding non-compliant.
    * 
*

* Example: encodeBytes( myData, Base64.GZIP ) or *

* Example: encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES ) * * @param source The data to convert * @param off Offset in array where conversion should begin * @param len Length of data to convert * @param options options alphabet type is pulled from this (standard, url-safe, ordered) * @see Base64#GZIP * @see Base64#DONT_BREAK_LINES * @since 2.0 */ public static String encodeBytes(final byte[] source, final int off, final int len, final int options) { // Isolate options int dontBreakLines = options & Base64.DONT_BREAK_LINES; int gzip = options & Base64.GZIP; // Compress? if (gzip == Base64.GZIP) { java.io.ByteArrayOutputStream baos = null; java.util.zip.GZIPOutputStream gzos = null; Base64.OutputStream b64os = null; try { // GZip -> Base64 -> ByteArray baos = new java.io.ByteArrayOutputStream(); b64os = new Base64.OutputStream(baos, Base64.ENCODE | options); gzos = new java.util.zip.GZIPOutputStream(b64os); gzos.write(source, off, len); gzos.close(); } // end try catch (java.io.IOException e) { e.printStackTrace(); return null; } // end catch finally { try { gzos.close(); } catch (Exception e) { } try { b64os.close(); } catch (Exception e) { } try { baos.close(); } catch (Exception e) { } } // end finally // Return value according to relevant encoding. return new String(baos.toByteArray(), Base64.PREFERRED_ENCODING); } // end if: compress // Else, don't compress. Better not to use streams at all then. else { // Convert option to boolean in way that code likes it. boolean breakLines = dontBreakLines == 0; int len43 = len * 4 / 3; byte[] outBuff = new byte[len43 + (len % 3 > 0 ? 4 : 0) // Account for padding + (breakLines ? len43 / Base64.MAX_LINE_LENGTH : 0)]; // New lines int d = 0; int e = 0; int len2 = len - 2; int lineLength = 0; for (; d < len2; d += 3, e += 4) { Base64.encode3to4(source, d + off, 3, outBuff, e, options); lineLength += 4; if (breakLines && lineLength == Base64.MAX_LINE_LENGTH) { outBuff[e + 4] = Base64.NEW_LINE; e++; lineLength = 0; } // end if: end of line } // en dfor: each piece of array if (d < len) { Base64.encode3to4(source, d + off, len - d, outBuff, e, options); e += 4; } // end if: some padding needed // Return value according to relevant encoding. return new String(outBuff, 0, e, Base64.PREFERRED_ENCODING); } // end else: don't compress } // end encodeBytes /* ******** D E C O D I N G M E T H O D S ******** */ /** * Decodes four bytes from array source * and writes the resulting bytes (up to three of them) * to destination. * The source and destination arrays can be manipulated * anywhere along their length by specifying * srcOffset and destOffset. * This method does not check to make sure your arrays * are large enough to accommodate srcOffset + 4 for * the source array or destOffset + 3 for * the destination array. * This method returns the actual number of bytes that * were converted from the Base64 encoding. *

This is the lowest level of the decoding methods with * all possible parameters.

* * @param source the array to convert * @param srcOffset the index where conversion begins * @param destination the array to hold the conversion * @param destOffset the index where output will be put * @param options alphabet type is pulled from this (standard, url-safe, ordered) * @return the number of decoded bytes converted * @since 1.3 */ private static int decode4to3(final byte[] source, final int srcOffset, final byte[] destination, final int destOffset, final int options) { byte[] DECODABET = Base64.getDecodabet(options); // Example: Dk== if (source[srcOffset + 2] == Base64.EQUALS_SIGN) { // Two ways to do the same thing. Don't know which way I like best. // int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 ) // | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 ); int outBuff = (DECODABET[source[srcOffset]] & 0xFF) << 18 | (DECODABET[source[srcOffset + 1]] & 0xFF) << 12; destination[destOffset] = (byte) (outBuff >>> 16); return 1; } // Example: DkL= else if (source[srcOffset + 3] == Base64.EQUALS_SIGN) { // Two ways to do the same thing. Don't know which way I like best. // int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 ) // | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 ) // | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 ); int outBuff = (DECODABET[source[srcOffset]] & 0xFF) << 18 | (DECODABET[source[srcOffset + 1]] & 0xFF) << 12 | (DECODABET[source[srcOffset + 2]] & 0xFF) << 6; destination[destOffset] = (byte) (outBuff >>> 16); destination[destOffset + 1] = (byte) (outBuff >>> 8); return 2; } // Example: DkLE else { try { // Two ways to do the same thing. Don't know which way I like best. // int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 ) // | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 ) // | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 ) // | ( ( DECODABET[ source[ srcOffset + 3 ] ] << 24 ) >>> 24 ); int outBuff = (DECODABET[source[srcOffset]] & 0xFF) << 18 | (DECODABET[source[srcOffset + 1]] & 0xFF) << 12 | (DECODABET[source[srcOffset + 2]] & 0xFF) << 6 | DECODABET[source[srcOffset + 3]] & 0xFF; destination[destOffset] = (byte) (outBuff >> 16); destination[destOffset + 1] = (byte) (outBuff >> 8); destination[destOffset + 2] = (byte) outBuff; return 3; } catch (Exception e) { System.out.println("" + source[srcOffset] + ": " + DECODABET[source[srcOffset]]); System.out.println("" + source[srcOffset + 1] + ": " + DECODABET[source[srcOffset + 1]]); System.out.println("" + source[srcOffset + 2] + ": " + DECODABET[source[srcOffset + 2]]); System.out.println("" + source[srcOffset + 3] + ": " + DECODABET[source[srcOffset + 3]]); return -1; } // end catch } } // end decodeToBytes /** * Very low-level access to decoding ASCII characters in * the form of a byte array. Does not support automatically * gunzipping or any other "fancy" features. * * @param source The Base64 encoded data * @param off The offset of where to begin decoding * @param len The length of characters to decode * @return decoded data * @since 1.3 */ public static byte[] decode(final byte[] source, final int off, final int len, final int options) { byte[] DECODABET = Base64.getDecodabet(options); int len34 = len * 3 / 4; byte[] outBuff = new byte[len34]; // Upper limit on size of output int outBuffPosn = 0; byte[] b4 = new byte[4]; int b4Posn = 0; int i = 0; byte sbiCrop = 0; byte sbiDecode = 0; for (i = off; i < off + len; i++) { sbiCrop = (byte) (source[i] & 0x7f); // Only the low seven bits sbiDecode = DECODABET[sbiCrop]; if (sbiDecode >= Base64.WHITE_SPACE_ENC) // White space, Equals sign or better { if (sbiDecode >= Base64.EQUALS_SIGN_ENC) { b4[b4Posn++] = sbiCrop; if (b4Posn > 3) { outBuffPosn += Base64.decode4to3(b4, 0, outBuff, outBuffPosn, options); b4Posn = 0; // If that was the equals sign, break out of 'for' loop if (sbiCrop == Base64.EQUALS_SIGN) { break; } } // end if: quartet built } // end if: equals sign or better } // end if: white space, equals sign or better else { System.err.println("Bad Base64 input character at " + i + ": " + source[i] + "(decimal)"); return null; } // end else: } // each input character byte[] out = new byte[outBuffPosn]; System.arraycopy(outBuff, 0, out, 0, outBuffPosn); return out; } // end decode /** * Decodes data from Base64 notation, automatically * detecting gzip-compressed data and decompressing it. * * @param s the string to decode * @return the decoded data * @since 1.4 */ public static byte[] decode(final String s) { return Base64.decode(s, Base64.NO_OPTIONS); } /** * Decodes data from Base64 notation, automatically * detecting gzip-compressed data and decompressing it. * * @param s the string to decode * @param options encode options such as URL_SAFE * @return the decoded data * @since 1.4 */ public static byte[] decode(final String s, final int options) { byte[] bytes = s.getBytes(Base64.PREFERRED_ENCODING); // // Decode bytes = Base64.decode(bytes, 0, bytes.length, options); // Check to see if it's gzip-compressed // GZIP Magic Two-Byte Number: 0x8b1f (35615) if (bytes != null && bytes.length >= 4) { int head = bytes[0] & 0xff | bytes[1] << 8 & 0xff00; if (java.util.zip.GZIPInputStream.GZIP_MAGIC == head) { java.io.ByteArrayInputStream bais = null; java.util.zip.GZIPInputStream gzis = null; java.io.ByteArrayOutputStream baos = null; byte[] buffer = new byte[2048]; int length = 0; try { baos = new java.io.ByteArrayOutputStream(); bais = new java.io.ByteArrayInputStream(bytes); gzis = new java.util.zip.GZIPInputStream(bais); while ((length = gzis.read(buffer)) >= 0) { baos.write(buffer, 0, length); } // end while: reading input // No error? Get new bytes. bytes = baos.toByteArray(); } // end try catch (java.io.IOException e) { // Just return originally-decoded bytes } // end catch finally { try { baos.close(); } catch (Exception e) { } try { gzis.close(); } catch (Exception e) { } try { bais.close(); } catch (Exception e) { } } // end finally } // end if: gzipped } // end if: bytes.length >= 2 return bytes; } // end decode /** * Attempts to decode Base64 data and deserialize a Java * Object within. Returns null if there was an error. * * @param encodedObject The Base64 data to decode * @return The decoded and deserialized object * @since 1.5 */ public static Object decodeToObject(final String encodedObject) { // Decode and gunzip if necessary byte[] objBytes = Base64.decode(encodedObject); java.io.ByteArrayInputStream bais = null; java.io.ObjectInputStream ois = null; Object obj = null; try { bais = new java.io.ByteArrayInputStream(objBytes); ois = new java.io.ObjectInputStream(bais); obj = ois.readObject(); } // end try catch (java.io.IOException e) { e.printStackTrace(); obj = null; } // end catch catch (java.lang.ClassNotFoundException e) { e.printStackTrace(); obj = null; } // end catch finally { try { bais.close(); } catch (Exception e) { } try { ois.close(); } catch (Exception e) { } } // end finally return obj; } // end decodeObject /** * Convenience method for encoding data to a file. * * @param dataToEncode byte array of data to encode in base64 form * @param filename Filename for saving encoded data * @return true if successful, false otherwise * @since 2.1 */ public static boolean encodeToFile(final byte[] dataToEncode, final String filename) { boolean success = false; Base64.OutputStream bos = null; try { bos = new Base64.OutputStream(new java.io.FileOutputStream(filename), Base64.ENCODE); bos.write(dataToEncode); success = true; } // end try catch (java.io.IOException e) { success = false; } // end catch: IOException finally { try { bos.close(); } catch (Exception e) { } } // end finally return success; } // end encodeToFile /** * Convenience method for decoding data to a file. * * @param dataToDecode Base64-encoded data as a string * @param filename Filename for saving decoded data * @return true if successful, false otherwise * @since 2.1 */ public static boolean decodeToFile(final String dataToDecode, final String filename) { boolean success = false; Base64.OutputStream bos = null; try { bos = new Base64.OutputStream(new java.io.FileOutputStream(filename), Base64.DECODE); bos.write(dataToDecode.getBytes(Base64.PREFERRED_ENCODING)); success = true; } // end try catch (java.io.IOException e) { success = false; } // end catch: IOException finally { try { bos.close(); } catch (Exception e) { } } // end finally return success; } // end decodeToFile /** * Convenience method for reading a base64-encoded * file and decoding it. * * @param filename Filename for reading encoded data * @return decoded byte array or null if unsuccessful * @since 2.1 */ public static byte[] decodeFromFile(final String filename) { byte[] decodedData = null; Base64.InputStream bis = null; try { // Set up some useful variables java.io.File file = new java.io.File(filename); byte[] buffer = null; int length = 0; int numBytes = 0; // Check for size of file if (file.length() > Integer.MAX_VALUE) { System.err.println("File is too big for this convenience method (" + file.length() + " bytes)."); return null; } // end if: file too big for int index buffer = new byte[(int) file.length()]; // Open a stream bis = new Base64.InputStream(new java.io.BufferedInputStream(new java.io.FileInputStream(file)), Base64.DECODE); // Read until done while ((numBytes = bis.read(buffer, length, 4096)) >= 0) { length += numBytes; } // Save in a variable to return decodedData = new byte[length]; System.arraycopy(buffer, 0, decodedData, 0, length); } // end try catch (java.io.IOException e) { System.err.println("Error decoding from file " + filename); } // end catch: IOException finally { try { if (bis != null) { bis.close(); } } catch (Exception e) { } } // end finally return decodedData; } // end decodeFromFile /** * Convenience method for reading a binary file * and base64-encoding it. * * @param filename Filename for reading binary data * @return base64-encoded string or null if unsuccessful * @since 2.1 */ public static String encodeFromFile(final String filename) { String encodedData = null; Base64.InputStream bis = null; try { // Set up some useful variables java.io.File file = new java.io.File(filename); byte[] buffer = new byte[Math.max((int) (file.length() * 1.4), 40)]; // Need max() for math on small files // (v2.2.1) int length = 0; int numBytes = 0; // Open a stream bis = new Base64.InputStream(new java.io.BufferedInputStream(new java.io.FileInputStream(file)), Base64.ENCODE); // Read until done while ((numBytes = bis.read(buffer, length, 4096)) >= 0) { length += numBytes; } // Save in a variable to return encodedData = new String(buffer, 0, length, Base64.PREFERRED_ENCODING); } // end try catch (java.io.IOException e) { System.err.println("Error encoding from file " + filename); } // end catch: IOException finally { try { bis.close(); } catch (Exception e) { } } // end finally return encodedData; } // end encodeFromFile /** * Reads infile and encodes it to outfile. * * @param infile Input file * @param outfile Output file * @return true if the operation is successful * @since 2.2 */ public static boolean encodeFileToFile(final String infile, final String outfile) { boolean success = false; java.io.InputStream in = null; java.io.OutputStream out = null; try { in = new Base64.InputStream(new java.io.BufferedInputStream(new java.io.FileInputStream(infile)), Base64.ENCODE); out = new java.io.BufferedOutputStream(new java.io.FileOutputStream(outfile)); byte[] buffer = new byte[65536]; // 64K int read = -1; while ((read = in.read(buffer)) >= 0) { out.write(buffer, 0, read); } // end while: through file success = true; } catch (java.io.IOException exc) { exc.printStackTrace(); } finally { try { in.close(); } catch (Exception exc) { } try { out.close(); } catch (Exception exc) { } } // end finally return success; } // end encodeFileToFile /** * Reads infile and decodes it to outfile. * * @param infile Input file * @param outfile Output file * @return true if the operation is successful * @since 2.2 */ public static boolean decodeFileToFile(final String infile, final String outfile) { boolean success = false; java.io.InputStream in = null; java.io.OutputStream out = null; try { in = new Base64.InputStream(new java.io.BufferedInputStream(new java.io.FileInputStream(infile)), Base64.DECODE); out = new java.io.BufferedOutputStream(new java.io.FileOutputStream(outfile)); byte[] buffer = new byte[65536]; // 64K int read = -1; while ((read = in.read(buffer)) >= 0) { out.write(buffer, 0, read); } // end while: through file success = true; } catch (java.io.IOException exc) { exc.printStackTrace(); } finally { try { in.close(); } catch (Exception exc) { } try { out.close(); } catch (Exception exc) { } } // end finally return success; } // end decodeFileToFile /* ******** I N N E R C L A S S I N P U T S T R E A M ******** */ /** * A {@link Base64.InputStream} will read data from another * java.io.InputStream, given in the constructor, * and encode/decode to/from Base64 notation on the fly. * * @see Base64 * @since 1.3 */ public static class InputStream extends java.io.FilterInputStream { private final boolean encode; // Encoding or decoding private int position; // Current position in the buffer private final byte[] buffer; // Small buffer holding converted data private final int bufferLength; // Length of buffer (3 or 4) private int numSigBytes; // Number of meaningful bytes in the buffer private int lineLength; private final boolean breakLines; // Break lines at less than 80 characters private final int options; // Record options used to create the stream. private final byte[] alphabet; // Local copies to avoid extra method calls private final byte[] decodabet; // Local copies to avoid extra method calls /** * Constructs a {@link Base64.InputStream} in DECODE mode. * * @param in the java.io.InputStream from which to read data. * @since 1.3 */ public InputStream(final java.io.InputStream in) { this(in, Base64.DECODE); } // end constructor /** * Constructs a {@link Base64.InputStream} in * either ENCODE or DECODE mode. *

* Valid options:

       *   ENCODE or DECODE: Encode or Decode as data is read.
       *   DONT_BREAK_LINES: don't break lines at 76 characters
       *     (only meaningful when encoding)
       *     Note: Technically, this makes your encoding non-compliant.
       * 
*

* Example: new Base64.InputStream( in, Base64.DECODE ) * * @param in the java.io.InputStream from which to read data. * @param options Specified options * @see Base64#ENCODE * @see Base64#DECODE * @see Base64#DONT_BREAK_LINES * @since 2.0 */ public InputStream(final java.io.InputStream in, final int options) { super(in); breakLines = (options & Base64.DONT_BREAK_LINES) != Base64.DONT_BREAK_LINES; encode = (options & Base64.ENCODE) == Base64.ENCODE; bufferLength = encode ? 4 : 3; buffer = new byte[bufferLength]; position = -1; lineLength = 0; this.options = options; // Record for later, mostly to determine which alphabet to use alphabet = Base64.getAlphabet(options); decodabet = Base64.getDecodabet(options); } // end constructor /** * Reads enough of the input stream to convert * to/from Base64 and returns the next byte. * * @return next byte * @since 1.3 */ @Override public int read() throws java.io.IOException { // Do we need to get data? if (position < 0) { if (encode) { byte[] b3 = new byte[3]; int numBinaryBytes = 0; for (int i = 0; i < 3; i++) { try { int b = in.read(); // If end of stream, b is -1. if (b >= 0) { b3[i] = (byte) b; numBinaryBytes++; } // end if: not end of stream } // end try: read catch (java.io.IOException e) { // Only a problem if we got no data at all. if (i == 0) { throw e; } } // end catch } // end for: each needed input byte if (numBinaryBytes > 0) { Base64.encode3to4(b3, 0, numBinaryBytes, buffer, 0, options); position = 0; numSigBytes = 4; } // end if: got data else { return -1; } } // end if: encoding // Else decoding else { byte[] b4 = new byte[4]; int i = 0; for (i = 0; i < 4; i++) { // Read four "meaningful" bytes: int b = 0; do { b = in.read(); } while (b >= 0 && decodabet[b & 0x7f] <= Base64.WHITE_SPACE_ENC); if (b < 0) { break; // Reads a -1 if end of stream } b4[i] = (byte) b; } // end for: each needed input byte if (i == 4) { numSigBytes = Base64.decode4to3(b4, 0, buffer, 0, options); position = 0; } // end if: got four characters else if (i == 0) { return -1; } else { // Must have broken out from above. throw new java.io.IOException("Improperly padded Base64 input."); } } // end else: decode } // end else: get data // Got data? if (position >= 0) { // End of relevant data? if ( /*!encode &&*/position >= numSigBytes) { return -1; } if (encode && breakLines && lineLength >= Base64.MAX_LINE_LENGTH) { lineLength = 0; return '\n'; } // end if else { lineLength++; // This isn't important when decoding // but throwing an extra "if" seems // just as wasteful. int b = buffer[position++]; if (position >= bufferLength) { position = -1; } return b & 0xFF; // This is how you "cast" a byte that's // intended to be unsigned. } // end else } // end if: position >= 0 else { // When JDK1.4 is more accepted, use an assertion here. throw new java.io.IOException("Error in Base64 code reading stream."); } } // end read /** * Calls {@link #read()} repeatedly until the end of stream * is reached or len bytes are read. * Returns number of bytes read into array or -1 if * end of stream is encountered. * * @param dest array to hold values * @param off offset for array * @param len max number of bytes to read into array * @return bytes read into array or -1 if end of stream is encountered. * @since 1.3 */ @Override public int read(final byte[] dest, final int off, final int len) throws java.io.IOException { int i; int b; for (i = 0; i < len; i++) { b = read(); // if( b < 0 && i == 0 ) // return -1; if (b >= 0) { dest[off + i] = (byte) b; } else if (i == 0) { return -1; } else { break; // Out of 'for' loop } } // end for: each byte read return i; } // end read } // end inner class InputStream /* ******** I N N E R C L A S S O U T P U T S T R E A M ******** */ /** * A {@link Base64.OutputStream} will write data to another * java.io.OutputStream, given in the constructor, * and encode/decode to/from Base64 notation on the fly. * * @see Base64 * @since 1.3 */ public static class OutputStream extends java.io.FilterOutputStream { private final boolean encode; private int position; private byte[] buffer; private final int bufferLength; private int lineLength; private final boolean breakLines; private final byte[] b4; // Scratch used in a few places private boolean suspendEncoding; private final int options; // Record for later private final byte[] alphabet; // Local copies to avoid extra method calls private final byte[] decodabet; // Local copies to avoid extra method calls /** * Constructs a {@link Base64.OutputStream} in ENCODE mode. * * @param out the java.io.OutputStream to which data will be written. * @since 1.3 */ public OutputStream(final java.io.OutputStream out) { this(out, Base64.ENCODE); } // end constructor /** * Constructs a {@link Base64.OutputStream} in * either ENCODE or DECODE mode. *

* Valid options:

       *   ENCODE or DECODE: Encode or Decode as data is read.
       *   DONT_BREAK_LINES: don't break lines at 76 characters
       *     (only meaningful when encoding)
       *     Note: Technically, this makes your encoding non-compliant.
       * 
*

* Example: new Base64.OutputStream( out, Base64.ENCODE ) * * @param out the java.io.OutputStream to which data will be written. * @param options Specified options. * @see Base64#ENCODE * @see Base64#DECODE * @see Base64#DONT_BREAK_LINES * @since 1.3 */ public OutputStream(final java.io.OutputStream out, final int options) { super(out); breakLines = (options & Base64.DONT_BREAK_LINES) != Base64.DONT_BREAK_LINES; encode = (options & Base64.ENCODE) == Base64.ENCODE; bufferLength = encode ? 3 : 4; buffer = new byte[bufferLength]; position = 0; lineLength = 0; suspendEncoding = false; b4 = new byte[4]; this.options = options; alphabet = Base64.getAlphabet(options); decodabet = Base64.getDecodabet(options); } // end constructor /** * Writes the byte to the output stream after * converting to/from Base64 notation. * When encoding, bytes are buffered three * at a time before the output stream actually * gets a write() call. * When decoding, bytes are buffered four * at a time. * * @param theByte the byte to write * @since 1.3 */ @Override public void write(final int theByte) throws java.io.IOException { // Encoding suspended? if (suspendEncoding) { super.out.write(theByte); return; } // end if: supsended // Encode? if (encode) { buffer[position++] = (byte) theByte; if (position >= bufferLength) // Enough to encode. { out.write(Base64.encode3to4(b4, buffer, bufferLength, options)); lineLength += 4; if (breakLines && lineLength >= Base64.MAX_LINE_LENGTH) { out.write(Base64.NEW_LINE); lineLength = 0; } // end if: end of line position = 0; } // end if: enough to output } // end if: encoding // Else, Decoding else { // Meaningful Base64 character? if (decodabet[theByte & 0x7f] > Base64.WHITE_SPACE_ENC) { buffer[position++] = (byte) theByte; if (position >= bufferLength) // Enough to output. { int len = Base64.decode4to3(buffer, 0, b4, 0, options); out.write(b4, 0, len); // out.write( Base64.decode4to3( buffer ) ); position = 0; } // end if: enough to output } // end if: meaningful base64 character else if (decodabet[theByte & 0x7f] != Base64.WHITE_SPACE_ENC) { throw new java.io.IOException("Invalid character in Base64 data."); } } // end else: decoding } // end write /** * Calls {@link #write(int)} repeatedly until len * bytes are written. * * @param theBytes array from which to read bytes * @param off offset for array * @param len max number of bytes to read into array * @since 1.3 */ @Override public void write(final byte[] theBytes, final int off, final int len) throws java.io.IOException { // Encoding suspended? if (suspendEncoding) { super.out.write(theBytes, off, len); return; } // end if: supsended for (int i = 0; i < len; i++) { write(theBytes[off + i]); } // end for: each byte written } // end write /** * Method added by PHIL. [Thanks, PHIL. -Rob] * This pads the buffer without closing the stream. */ public void flushBase64() throws java.io.IOException { if (position > 0) { if (encode) { out.write(Base64.encode3to4(b4, buffer, position, options)); position = 0; } // end if: encoding else { throw new java.io.IOException("Base64 input not properly padded."); } } // end if: buffer partially full } // end flush /** * Flushes and closes (I think, in the superclass) the stream. * * @since 1.3 */ @Override public void close() throws java.io.IOException { // 1. Ensure that pending characters are written flushBase64(); // 2. Actually close the stream // Base class both flushes and closes. super.close(); buffer = null; out = null; } // end close /** * Suspends encoding of the stream. * May be helpful if you need to embed a piece of * base640-encoded data in a stream. * * @since 1.5.1 */ public void suspendEncoding() throws java.io.IOException { flushBase64(); suspendEncoding = true; } // end suspendEncoding /** * Resumes encoding of the stream. * May be helpful if you need to embed a piece of * base640-encoded data in a stream. * * @since 1.5.1 */ public void resumeEncoding() { suspendEncoding = false; } // end resumeEncoding } // end inner class OutputStream } // end class Base64





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