| /******************************************************************************* |
| * Copyright (c) 2008 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - Initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.ptp.internal.rdt.core; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.util.zip.GZIPInputStream; |
| import java.util.zip.GZIPOutputStream; |
| |
| public class Serializer { |
| static final char[] BASE64_ALPHABET = { |
| 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', |
| 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', |
| 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', |
| 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', |
| '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/', |
| }; |
| |
| static final byte[] BASE64_ALPHABET_INVERSE = { |
| 62, 0, 0, 0, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, |
| 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, |
| 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, |
| 0, 0, 0, 0, 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, |
| 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, |
| }; |
| |
| public static String serialize(Object o) throws IOException { |
| ByteArrayOutputStream buffer = new ByteArrayOutputStream(); |
| GZIPOutputStream zipStream = new GZIPOutputStream(buffer); |
| ObjectOutputStream out = new ObjectOutputStream(zipStream); |
| out.writeObject(o); |
| out.close(); |
| return encodeBase64(buffer.toByteArray(), 0, buffer.size()); |
| } |
| |
| public static Object deserialize(String data) throws IOException, ClassNotFoundException { |
| byte[] buffer = decodeBase64(data); |
| ByteArrayInputStream stream = new ByteArrayInputStream(buffer); |
| GZIPInputStream zipStream = new GZIPInputStream(stream); |
| ObjectInputStream in = new ObjectInputStream(zipStream); |
| return in.readObject(); |
| } |
| |
| static String encodeBase64(byte[] data, int offset, int length) { |
| ByteArrayInputStream in = new ByteArrayInputStream(data); |
| StringBuilder buffer = new StringBuilder(); |
| int remainder = length % 3; |
| int i; |
| for (i = offset; i < offset + length - remainder; i += 3) { |
| int value = (in.read() << 16) + (in.read() << 8) + in.read(); |
| buffer.append(BASE64_ALPHABET[(value >>> 18) & 0x3f]); |
| buffer.append(BASE64_ALPHABET[(value >>> 12) & 0x3f]); |
| buffer.append(BASE64_ALPHABET[(value >>> 6) & 0x3f]); |
| buffer.append(BASE64_ALPHABET[value & 0x3f]); |
| } |
| switch (remainder) { |
| case 2: |
| int value = (in.read() << 16) + (in.read() << 8); |
| buffer.append(BASE64_ALPHABET[(value >>> 18) & 0x3f]); |
| buffer.append(BASE64_ALPHABET[(value >>> 12) & 0x3f]); |
| buffer.append(BASE64_ALPHABET[(value >>> 6) & 0x3f]); |
| buffer.append('='); |
| break; |
| case 1: |
| value = (in.read() << 16); |
| buffer.append(BASE64_ALPHABET[(value >>> 18) & 0x3f]); |
| buffer.append(BASE64_ALPHABET[(value >>> 12) & 0x3f]); |
| buffer.append('='); |
| buffer.append('='); |
| break; |
| } |
| return buffer.toString(); |
| } |
| |
| static byte[] decodeBase64(String data) { |
| int paddingLength = 0; |
| for (int i = 1; i < 3; i++) { |
| if (data.charAt(data.length() - i) == '=') { |
| paddingLength++; |
| } else { |
| break; |
| } |
| } |
| int length = (data.length() / 4 * 3) - paddingLength; |
| int bytesDecoded = 0; |
| byte[] buffer = new byte[length]; |
| int i; |
| int charactersToRead = paddingLength > 0 ? data.length() - 4 : data.length(); |
| for (i = 0; i < charactersToRead; i+= 4) { |
| int value = (BASE64_ALPHABET_INVERSE[data.charAt(i) - 43] << 18) |
| + (BASE64_ALPHABET_INVERSE[data.charAt(i + 1) - 43] << 12) |
| + (BASE64_ALPHABET_INVERSE[data.charAt(i + 2) - 43] << 6) |
| + BASE64_ALPHABET_INVERSE[data.charAt(i + 3) - 43]; |
| buffer[bytesDecoded++] = Integer.valueOf((value >>> 16) & 0xff).byteValue(); |
| buffer[bytesDecoded++] = Integer.valueOf((value >>> 8) & 0xff).byteValue(); |
| buffer[bytesDecoded++] = Integer.valueOf(value & 0xff).byteValue(); |
| } |
| switch (paddingLength) { |
| case 2: |
| int value = (BASE64_ALPHABET_INVERSE[data.charAt(i) - 43] << 18) |
| + (BASE64_ALPHABET_INVERSE[data.charAt(i + 1) - 43] << 12); |
| buffer[bytesDecoded++] = (byte) ((value >>> 16) & 0xff); |
| break; |
| case 1: |
| value = (BASE64_ALPHABET_INVERSE[data.charAt(i) - 43] << 18) |
| + (BASE64_ALPHABET_INVERSE[data.charAt(i + 1) - 43] << 12) |
| + (BASE64_ALPHABET_INVERSE[data.charAt(i + 2) - 43] << 6); |
| buffer[bytesDecoded++] = (byte) ((value >>> 16) & 0xff); |
| buffer[bytesDecoded++] = (byte) ((value >>> 8) & 0xff); |
| break; |
| } |
| return buffer; |
| } |
| } |