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com.sshtools.common.util.Base64 Maven / Gradle / Ivy

/**
 * (c) 2002-2021 JADAPTIVE Limited. All Rights Reserved.
 *
 * This file is part of the Maverick Synergy Java SSH API.
 *
 * Maverick Synergy is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Maverick Synergy is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Maverick Synergy.  If not, see .
 */
/* HEADER */
package com.sshtools.common.util;

/**
 * 
 * 
 * @author $author$
 */
public class Base64 {
	/**  */
	public final static boolean ENCODE = true;

	/**  */
	public final static boolean DECODE = false;
	private final static int MAX_LINE_LENGTH = 64;
	private final static byte EQUALS_SIGN = (byte) '=';
	private final static byte NEW_LINE = (byte) '\n';
	private final static byte[] 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) '/' };
	private final static byte[] DECODABET = { -9, -9, -9, -9, -9, -9, -9, -9,
			-9, -5, -5, -9, -9, -5, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9,
			-9, -9, -9, -9, -9, -9, -9, -5, -9, -9, -9, -9, -9, -9, -9, -9, -9,
			-9,
			// Decimal 33 - 42
			62, -9, -9, -9,
			// Decimal 44 - 46
			63,
			// Slash at decimal 47
			52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -9, -9, -9, -1, -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, -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, -9, -9, -9, -9 };
	@SuppressWarnings("unused")
	private final static byte BAD_ENCODING = -9;

	// Indicates error in encoding
	private final static byte white_SPACE_ENC = -5;

	// Indicates white space in encoding
	private final static byte EQUALS_SIGN_ENC = -1;

	// Indicates equals sign in encoding
	private Base64() {
	}

	/**
	 * 
	 * 
	 * @param s
	 * 
	 * @return
	 */
	public static byte[] decode(String s) {
		byte[] bytes = s.getBytes();

		return decode(bytes, 0, bytes.length);
	}

	// end decode
	public static byte[] decode(byte[] source, int off, int len) {
		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 < len; i++) {
			sbiCrop = (byte) (source[i] & 0x7f);

			// Only the low seven bits
			sbiDecode = DECODABET[sbiCrop];

			if (sbiDecode >= white_SPACE_ENC) {
				// White space, Equals sign or better
				if (sbiDecode >= EQUALS_SIGN_ENC) {
					b4[b4Posn++] = sbiCrop;

					if (b4Posn > 3) {
						outBuffPosn += decode4to3(b4, 0, outBuff, outBuffPosn);
						b4Posn = 0;

						// If that was the equals sign, break out of 'for' loop
						if (sbiCrop == 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
	public static Object decodeToObject(String encodedObject) {
		byte[] objBytes = decode(encodedObject);

		java.io.ByteArrayInputStream bais = null;
		java.io.ObjectInputStream ois = null;

		try {
			bais = new java.io.ByteArrayInputStream(objBytes);
			ois = new java.io.ObjectInputStream(bais);

			return ois.readObject();
		}
		// end try
		catch (java.io.IOException e) {
			return null;
		}
		// end catch
		catch (java.lang.ClassNotFoundException e) {
			return null;
		}
		// end catch
		finally {
			try {
				bais.close();
			} catch (Exception e) {
			}

			try {
				ois.close();
			} catch (Exception e) {
			}
		}

		// end finally
	}

	// end decodeObject
	public static String decodeToString(String s) {
		return new String(decode(s));
	}

	// end decodeToString
	public static String encodeBytes(byte[] source, boolean ignoreMaxLineLength) {
		return encodeBytes(source, 0, source.length, ignoreMaxLineLength);
	}

	// end encodeBytes
	public static String encodeBytes(byte[] source, int off, int len,
			boolean ignoreMaxLineLength) {
		int len43 = (len * 4) / 3;
		byte[] outBuff = new byte[(len43) + (((len % 3) > 0) ? 4 : 0)
				+ (len43 / MAX_LINE_LENGTH)];

		// New lines
		int d = 0;
		int e = 0;
		int len2 = len - 2;
		int lineLength = 0;

		for (; d < len2; d += 3, e += 4) {
			encode3to4(source, d + off, 3, outBuff, e);

			lineLength += 4;

			if (!ignoreMaxLineLength) {
				if (lineLength == MAX_LINE_LENGTH) {
					outBuff[e + 4] = NEW_LINE;
					e++;
					lineLength = 0;
				}

				// end if: end of line
			}
		}

		// en dfor: each piece of array
		if (d < len) {
			encode3to4(source, d + off, len - d, outBuff, e);
			e += 4;
		}

		// end if: some padding needed
		return new String(outBuff, 0, e);
	}

	// end encodeBytes
	public static String encodeObject(java.io.Serializable serializableObject) {
		java.io.ByteArrayOutputStream baos = null;
		java.io.OutputStream b64os = null;
		java.io.ObjectOutputStream oos = null;

		try {
			baos = new java.io.ByteArrayOutputStream();
			b64os = new Base64.OutputStream(baos, Base64.ENCODE);
			oos = new java.io.ObjectOutputStream(b64os);

			oos.writeObject(serializableObject);
		}
		// end try
		catch (java.io.IOException e) {
			return null;
		}
		// end catch
		finally {
			try {
				oos.close();
			} catch (Exception e) {
			}

			try {
				b64os.close();
			} catch (Exception e) {
			}

			try {
				baos.close();
			} catch (Exception e) {
			}
		}

		// end finally
		return new String(baos.toByteArray());
	}

	// end encode
	public static String encodeString(String s, boolean ignoreMaxLineLength) {
		return encodeBytes(s.getBytes(), ignoreMaxLineLength);
	}

	// end encodeString
	/*
	 * public static void main(String[] args) { String s =
	 * "P2/56wAAAgoAAAAmZGwtbW9kcHtzaWdue2RzYS1uaXN0LXNoYTF9LGRoe3Bs" +
	 * "YWlufX0AAAAIM2Rlcy1jYmMAAAHIifTc7/X/swWj4OHVWX9RsUxWh4citAMwGzv6X9mUG6a"
	 * +
	 * "mh5/2f6IiQ3lOeHFd5J0EAOeGNuLqE/RWJ/fFaZAzD6YTr1GZ5hflMzvRu3jbgZoLRz2TaT"
	 * +
	 * "qeRs1yWrQoqANE2nBx6uDNrRahduqalLg2P/ezRCLGpqbw3HFgXmiZvzhd/rdEgZur7ZPnm"
	 * +
	 * "EK7t4Ldypk/7xcK192JTbBXLDSKOEAqfYQb9CzW8MgEXde0DpMRZ9Fgm0KWPfz4CCJ0F9dd"
	 * +
	 * "zcWl1nuGibL3klLKQANgecTurFlrxkBaHgxgl9nIvf24wH3nscvmD/uFOzacT/LzFaD03HFj"
	 * +
	 * "/QHCiTezxVyyuJ39d3e6BBegV26vEFoGbrZ2mMf08C2MBmLmZELYdBRJ4kLpT5EZkzR8L4rT"
	 * +
	 * "GxNiWkb4dGT42gHH41p2ad053lctyFWp/uQJnvJEiEm3BMURVY7k1S7zgv2FHgHE0LssXvBHx"
	 * +
	 * "n/wnft0ne2NOqEXfs/Y4I39Nd7eDIupSVy/ZFfMmNPIhzKyC5lFMkjIMxPXNk548ZoP9Tnga"
	 * + "4NPhHNKtcMinVvO2HT6dnIKMNb/NuXooULHIMVISpslRzXiVlTcN9vL/jhJhn9S";
	 * byte[] buf = Base64.decode(s); System.out.println(new
	 * String(buf).toString()); s =
	 * "P2/56wAAAgIAAAAmZGwtbW9kcHtzaWdue2RzYS1uaXN0LXNoYTF9LGRoe3BsYWlufX0A" +
	 * "AAAEbm9uZQAAAcQAAAHAAAAAAAAABACwV9/fUska/ZHWa4YzXIPFJ4RbcFqPVV0vmyWkFekw"
	 * +
	 * "wKE1mA0GVDRq9X0HTjA2DZWcQ46suVP/8mLwpnjTKNiRdFvXWGkxEpavLp+bjPa/NXsEsjZL"
	 * +
	 * "aeO5iPZ11Xw5lx7uor8q/Ewwo9IcYOXzuOWN1EPCpdRv5OOaO3PCMq6QSQAAA/9j/IrSUDtf"
	 * +
	 * "BLBlzPHBrzboKjIMXv9O8CIRtSqnV7GV9wllgh3Cm+Eh+rd5CB698JGQD9tMdBn4s8bj/BDL"
	 * +
	 * "4qsxbQbAsZOIin6fqDKNLDxFo357eXM06I5569PgC6cuBoJXOyQTg+sLrjT8/b3/1N4TjdZN"
	 * +
	 * "JiKiSiuOzkn03tNSbgAAAKDJhI2ZNNvzOXhp+VFuoY//D9GvHwAAA/9NkAROm4wF7NCPsBXd"
	 * +
	 * "/+QfNV3NM/FSpOonZZDg2AVnCCGdLOXCWEj60EVHWEf5FbOjJ1KynbbdZA6q5JtVDIYuU9wH"
	 * +
	 * "BCsT5iCexGD5j2HYNcUXT4VG5a6qzqloR2JizlZOcjiEM2j0/hydFUei0VYmJNY5L//AprO6"
	 * + "1UJL2OGFEQAAAJ0Ts+KlcAYmJjJWODOG3mYuiTgv7A=="; buf = Base64.decode(s);
	 * System.out.println(new String(buf).toString()); buf = Base64.decode(
	 * "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"
	 * ); System.out.println(new String(buf).toString()); buf = Base64.decode(
	 * "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"
	 * ); System.out.println(new String(buf).toString()); }
	 */

	/*
	 * ******** D E C O D I N G M E T H O D S ********
	 */
	private static byte[] decode4to3(byte[] fourBytes) {
		byte[] outBuff1 = new byte[3];
		int count = decode4to3(fourBytes, 0, outBuff1, 0);
		byte[] outBuff2 = new byte[count];

		for (int i = 0; i < count; i++) {
			outBuff2[i] = outBuff1[i];
		}

		return outBuff2;
	}

	private static int decode4to3(byte[] source, int srcOffset,
			byte[] destination, int destOffset) {
		// Example: Dk==
		if (source[srcOffset + 2] == EQUALS_SIGN) {
			int outBuff = ((DECODABET[source[srcOffset]] << 24) >>> 6)
					| ((DECODABET[source[srcOffset + 1]] << 24) >>> 12);

			destination[destOffset] = (byte) (outBuff >>> 16);

			return 1;
		}
		// Example: DkL=
		else if (source[srcOffset + 3] == EQUALS_SIGN) {
			int outBuff = ((DECODABET[source[srcOffset]] << 24) >>> 6)
					| ((DECODABET[source[srcOffset + 1]] << 24) >>> 12)
					| ((DECODABET[source[srcOffset + 2]] << 24) >>> 18);

			destination[destOffset] = (byte) (outBuff >>> 16);
			destination[destOffset + 1] = (byte) (outBuff >>> 8);

			return 2;
		}
		// Example: DkLE
		else {
			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);

			destination[destOffset] = (byte) (outBuff >> 16);
			destination[destOffset + 1] = (byte) (outBuff >> 8);
			destination[destOffset + 2] = (byte) (outBuff);

			return 3;
		}
	}

	// end decodeToBytes

	/*
	 * ******** E N C O D I N G M E T H O D S ********
	 */
	// private static byte[] encode3to4(byte[] threeBytes) {
	// return encode3to4(threeBytes, 3);
	// }

	// end encodeToBytes
	private static byte[] encode3to4(byte[] threeBytes, int numSigBytes) {
		byte[] dest = new byte[4];
		encode3to4(threeBytes, 0, numSigBytes, dest, 0);

		return dest;
	}

	private static byte[] encode3to4(byte[] source, int srcOffset,
			int numSigBytes, byte[] destination, int destOffset) {
		// 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] = EQUALS_SIGN;

			return destination;

		case 1:
			destination[destOffset] = ALPHABET[(inBuff >>> 18)];
			destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f];
			destination[destOffset + 2] = EQUALS_SIGN;
			destination[destOffset + 3] = EQUALS_SIGN;

			return destination;

		default:
			return destination;
		}

		// end switch
	}

	// end encode3to4

	/*
	 * ******** I N N E R C L A S S I N P U T S T R E A M ********
	 */
	public static class InputStream extends java.io.FilterInputStream {
		private byte[] buffer;

		// Small buffer holding converted data
		private boolean encode;

		// Encoding or decoding
		private int bufferLength;

		// Length of buffer (3 or 4)
		private int numSigBytes;

		// Number of meaningful bytes in the buffer
		private int position;

		// Current position in the buffer
		public InputStream(java.io.InputStream in) {
			this(in, Base64.DECODE);
		}

		// end constructor
		public InputStream(java.io.InputStream in, boolean encode) {
			super(in);
			this.encode = encode;
			this.bufferLength = encode ? 4 : 3;
			this.buffer = new byte[bufferLength];
			this.position = -1;
		}

		// end constructor
		public int read() throws java.io.IOException {
			// Do we need to get data?
			if (position < 0) {
				if (encode) {
					byte[] b3 = new byte[3];
					numSigBytes = 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;
								numSigBytes++;
							}

							// 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 (numSigBytes > 0) {
						encode3to4(b3, 0, numSigBytes, buffer, 0);
						position = 0;
					}

					// end if: got data
				}
				// end if: encoding
				// Else decoding
				else {
					byte[] b4 = new byte[4];
					int i = 0;

					for (i = 0; i < 4; i++) {
						int b = 0;

						do {
							b = in.read();
						} while ((b >= 0)
								&& (DECODABET[b & 0x7f] < 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 = decode4to3(b4, 0, buffer, 0);
						position = 0;
					}

					// end if: got four characters
				}

				// end else: decode
			}

			// end else: get data
			// Got data?
			if (position >= 0) {
				// End of relevant data?
				if (!encode && (position >= numSigBytes)) {
					return -1;
				}

				int b = buffer[position++];

				if (position >= bufferLength) {
					position = -1;
				}

				return b;
			}
			// end if: position >= 0
			// Else error
			return -1;
		}

		// end read
		public int read(byte[] dest, int off, int len)
				throws java.io.IOException {
			int i;
			int b;

			for (i = 0; i < len; i++) {
				b = read();

				if (b < 0) {
					return -1;
				}

				dest[off + i] = (byte) b;
			}

			// 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 ********
	 */
	public static class OutputStream extends java.io.FilterOutputStream {
		private byte[] buffer;
		private boolean encode;
		private int bufferLength;
		private int lineLength;
		private int position;

		public OutputStream(java.io.OutputStream out) {
			this(out, Base64.ENCODE);
		}

		// end constructor
		public OutputStream(java.io.OutputStream out, boolean encode) {
			super(out);
			this.encode = encode;
			this.bufferLength = encode ? 3 : 4;
			this.buffer = new byte[bufferLength];
			this.position = 0;
			this.lineLength = 0;
		}

		// end constructor
		public void close() throws java.io.IOException {
			this.flush();

			super.close();
			out.close();

			buffer = null;
			out = null;
		}

		// end close
		public void flush() throws java.io.IOException {
			if (position > 0) {
				if (encode) {
					out.write(Base64.encode3to4(buffer, position));
				}
				// end if: encoding
				else {
					throw new java.io.IOException(
							"Base64 input not properly padded.");
				}

				// end else: decoding
			}

			// end if: buffer partially full
			super.flush();
			out.flush();
		}

		// end flush
		public void write(int theByte) throws java.io.IOException {
			buffer[position++] = (byte) theByte;

			if (position >= bufferLength) {
				if (encode) {
					out.write(Base64.encode3to4(buffer, bufferLength));

					lineLength += 4;

					if (lineLength >= MAX_LINE_LENGTH) {
						out.write(NEW_LINE);
						lineLength = 0;
					}

					// end if: end o fline
				}
				// end if: encoding
				else {
					out.write(Base64.decode4to3(buffer));
				}

				position = 0;
			}

			// end if: convert and flush
		}

		// end write
		public void write(byte[] theBytes, int off, int len)
				throws java.io.IOException {
			for (int i = 0; i < len; i++) {
				write(theBytes[off + i]);
			}

			// end for: each byte written
		}

		// end write
	}

	// end inner class OutputStream
}
// end class Base64