base64.java

网络游戏天堂1的java源代码。。。。。

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * http://www.gnu.org/copyleft/gpl.html
 */
package l1j.server;

import l1j.server.server.utils.StreamUtil;

public class Base64 {

	/* ******** P U B L I C F I E L D S ******** */

	public final static int NO_OPTIONS = 0;

	public final static int ENCODE = 1;

	public final static int DECODE = 0;

	public final static int GZIP = 2;

	public final static int DONT_BREAK_LINES = 8;

	/* ******** P R I V A T E F I E L D S ******** */

	private final static int MAX_LINE_LENGTH = 76;

	private final static byte EQUALS_SIGN = (byte) '=';

	private final static byte NEW_LINE = (byte) '\n';

	private final static String PREFERRED_ENCODING = "UTF-8";

	private final static byte[] ALPHABET;

	private final static byte[] _NATIVE_ALPHABET = /*
													 * May be something funny
													 * like EBCDIC
													 */
	{ (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) '/' };

	static {
		byte[] __bytes;
		try {
			__bytes = new String(
					"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/")
					.getBytes(PREFERRED_ENCODING);
		} // end try
		catch (java.io.UnsupportedEncodingException use) {
			__bytes = _NATIVE_ALPHABET; // Fall back to native encoding
		} // end catch
		ALPHABET = __bytes;
	} // end static

	private final static byte[] 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
	 */
	};

	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() {
	}

	/* ******** 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[] b4, byte[] threeBytes,
			int numSigBytes) {
		encode3to4(threeBytes, 0, numSigBytes, b4, 0);
		return b4;
	} // end encode3to4

	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

	public static String encodeObject(java.io.Serializable serializableObject) {
		return encodeObject(serializableObject, NO_OPTIONS);
	} // end encodeObject

	public static String encodeObject(java.io.Serializable serializableObject,
			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 & GZIP);
		int dontBreakLines = (options & DONT_BREAK_LINES);

		try {
			// ObjectOutputStream -> (GZIP) -> Base64 -> ByteArrayOutputStream
			baos = new java.io.ByteArrayOutputStream();
			b64os = new Base64.OutputStream(baos, ENCODE | dontBreakLines);

			// GZip?
			if (gzip == 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 {
			StreamUtil.close(oos, gzos, b64os, baos);
		} // end finally

		// Return value according to relevant encoding.
		try {
			return new String(baos.toByteArray(), PREFERRED_ENCODING);
		} // end try
		catch (java.io.UnsupportedEncodingException uue) {
			return new String(baos.toByteArray());
		} // end catch

	} // end encode

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

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

	public static String encodeBytes(byte[] source, int off, int len) {
		return encodeBytes(source, off, len, NO_OPTIONS);
	} // end encodeBytes

	public static String encodeBytes(byte[] source, int off, int len,
			int options) {
		// Isolate options
		int dontBreakLines = (options & DONT_BREAK_LINES);
		int gzip = (options & GZIP);

		// Compress?
		if (gzip == 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, ENCODE | dontBreakLines);
				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 {
				StreamUtil.close(gzos, b64os, baos);
			} // end finally

			// Return value according to relevant encoding.
			try {
				return new String(baos.toByteArray(), PREFERRED_ENCODING);
			} // end try
			catch (java.io.UnsupportedEncodingException uue) {
				return new String(baos.toByteArray());
			} // end catch
		} // 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) // Main 4:3
					+ ((len % 3) > 0 ? 4 : 0) // Account for padding
					+ (breakLines ? (len43 / 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) {
				encode3to4(source, d + off, 3, outBuff, e);

				lineLength += 4;
				if (breakLines && 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 value according to relevant encoding.
			try {
				return new String(outBuff, 0, e, PREFERRED_ENCODING);
			} // end try
			catch (java.io.UnsupportedEncodingException uue) {
				return new String(outBuff, 0, e);
			} // end catch

		} // end else: don't compress

	} // end encodeBytes

	/* ******** D E C O D I N G M E T H O D S ******** */

	/**
	 * Decodes the first four bytes of array <var>fourBytes</var> and returns
	 * an array up to three bytes long with the decoded values.
	 * 
	 * @param fourBytes
	 *            the array with Base64 content
	 * @return array with decoded values
	 * @since 1.3
	 */
	private static byte[] decode4to3(byte[] fourBytes) {
		byte[] outBuff1 = new byte[3];
		int count = decode4to3(fourBytes, 0, outBuff1, 0);