base64.java

网络游戏天堂1的java源代码。。。。。

		byte[] outBuff2 = new byte[count];

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

		return outBuff2;
	}

	/**
	 * Decodes four bytes from array <var>source</var> and writes the resulting
	 * bytes (up to three of them) to <var>destination</var>. The source and
	 * destination arrays can be manipulated anywhere along their length by
	 * specifying <var>srcOffset</var> and <var>destOffset</var>. This method
	 * does not check to make sure your arrays are large enough to accomodate
	 * <var>srcOffset</var> + 4 for the <var>source</var> array or
	 * <var>destOffset</var> + 3 for the <var>destination</var> array. This
	 * method returns the actual number of bytes that were converted from the
	 * Base64 encoding.
	 * 
	 * 
	 * @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
	 * @return the number of decoded bytes converted
	 * @since 1.3
	 */
	private static int decode4to3(byte[] source, int srcOffset,
			byte[] destination, int destOffset) {
		// Example: Dk==
		if (source[srcOffset + 2] == 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] == 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) {
				l1j.eric.gui.J_Main.getInstance().addConsolPost("" + source[srcOffset] + ": "
						+ (DECODABET[source[srcOffset]]));
				l1j.eric.gui.J_Main.getInstance().addConsolPost("" + source[srcOffset + 1] + ": "
						+ (DECODABET[source[srcOffset + 1]]));
				l1j.eric.gui.J_Main.getInstance().addConsolPost("" + source[srcOffset + 2] + ": "
						+ (DECODABET[source[srcOffset + 2]]));
				l1j.eric.gui.J_Main.getInstance().addConsolPost("" + source[srcOffset + 3] + ": "
						+ (DECODABET[source[srcOffset + 3]]));
				return -1;
			} // e nd 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(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 < off + 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

	/**
	 * 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(String s) {
		byte[] bytes;
		try {
			bytes = s.getBytes(PREFERRED_ENCODING);
		} // end try
		catch (java.io.UnsupportedEncodingException uee) {
			bytes = s.getBytes();
		} // end catch
		// </change>

		// Decode
		bytes = decode(bytes, 0, bytes.length);

		// Check to see if it's gzip-compressed
		// GZIP Magic Two-Byte Number: 0x8b1f (35615)
		if (bytes.length >= 2) {

			int head = (bytes[0] & 0xff) | ((bytes[1] << 8) & 0xff00);
			if (bytes != null && // In case decoding returned null
					bytes.length >= 4 && // Don't want to get
					// ArrayIndexOutOfBounds exception
					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 {
					StreamUtil.close(baos, gzis, bais);
				} // 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 <tt>null</tt> 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(String encodedObject) {
		// Decode and gunzip if necessary
		byte[] objBytes = 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();
		} // end catch
		catch (java.lang.ClassNotFoundException e) {
			e.printStackTrace();
		} // end catch
		finally {
			StreamUtil.close(bais, ois);
		} // end finally

		return obj;
	} // end decodeObject

	/* ******** 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
	 * {@link java.io.InputStream}, given in the constructor, and encode/decode
	 * to/from Base64 notation on the fly.
	 * 
	 * @see Base64
	 * @see java.io.FilterInputStream
	 * @since 1.3
	 */
	public static class InputStream extends java.io.FilterInputStream {
		private int options; // Options specified

		private boolean encode; // Encoding or decoding

		private int position; // Current position in the buffer

		private byte[] buffer; // Small buffer holding converted data

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

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

		private int lineLength;

		private boolean breakLines; // Break lines at less than 80 characters

		/**
		 * Constructs a {@link Base64#InputStream} in DECODE mode.
		 * 
		 * @param in
		 *            the {@link java.io.InputStream} from which to read data.
		 * @since 1.3
		 */
		public InputStream(java.io.InputStream in) {
			this(in, DECODE);
		} // end constructor

		/**
		 * Constructs a {@link Base64#InputStream} in either ENCODE or DECODE
		 * mode.
		 * <p>
		 * Valid options:
		 * 
		 * <pre>
		 *      ENCODE or DECODE: Encode or Decode as data is read.
		 *      DONT_BREAK_LINES: don't break lines at 76 characters
		 *        (only meaningful when encoding)
		 *        &lt;i&gt;Note: Technically, this makes your encoding non-compliant.&lt;/i&gt;
		 * </pre>
		 * 
		 * <p>
		 * Example: <code>new Base64.InputStream( in, Base64.DECODE )</code>
		 * 
		 * 
		 * @param in
		 *            the {@link 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(java.io.InputStream in, int options) {
			super(in);
			this.options = options;
			this.breakLines = (options & DONT_BREAK_LINES) != DONT_BREAK_LINES;
			this.encode = (options & ENCODE) == ENCODE;
			this.bufferLength = encode ? 4 : 3;
			this.buffer = new byte[bufferLength];
			this.position = -1;
			this.lineLength = 0;
		} // 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