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authorslewis2008-06-11 20:03:59 -0400
committerslewis2008-06-11 20:03:59 -0400
commitad7e97c8fab8d7e44334da9d194d4726bd73ab9d (patch)
tree9a3caa402ad41f7a3a6a3d2a7427b41e67f31d8c /framework/bundles/org.eclipse.ecf.identity/src
parentb773764875cc7ec6008616bacbbbbab4d2065736 (diff)
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Fix for 236759v20080611-2118
Diffstat (limited to 'framework/bundles/org.eclipse.ecf.identity/src')
-rw-r--r--framework/bundles/org.eclipse.ecf.identity/src/org/eclipse/ecf/core/util/Base64.java298
1 files changed, 196 insertions, 102 deletions
diff --git a/framework/bundles/org.eclipse.ecf.identity/src/org/eclipse/ecf/core/util/Base64.java b/framework/bundles/org.eclipse.ecf.identity/src/org/eclipse/ecf/core/util/Base64.java
index d573dfd30..253192b8e 100644
--- a/framework/bundles/org.eclipse.ecf.identity/src/org/eclipse/ecf/core/util/Base64.java
+++ b/framework/bundles/org.eclipse.ecf.identity/src/org/eclipse/ecf/core/util/Base64.java
@@ -1,123 +1,217 @@
/*******************************************************************************
- * Copyright (c) 2004 Composent, Inc. 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
+ * 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: Composent, Inc. - initial API and implementation
- ******************************************************************************/
+ * Contributors:
+ * IBM Corporation - initial API and implementation
+ * Composent, Inc. - enhanced API
+ *******************************************************************************/
package org.eclipse.ecf.core.util;
-import org.eclipse.ecf.internal.core.identity.Messages;
-import org.eclipse.osgi.util.NLS;
+import java.io.UnsupportedEncodingException;
+
+public class Base64 {
+
+ private static final byte equalSign = (byte) '=';
+
+ static char digits[] = {'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', '+', '/'};
-/**
- *
- * Encode/decode byte arrays into base64 strings. Code originally acquired from
- * ftp://ftp.ora.com/pub/examples/java/crypto/files/oreilly/jonathan/util/
- *
- * Several small modifications were made: the '_' character was substituted for
- * the '/' character, the '-' char substituted for the '=' char, and the '.'
- * substituted for the '+' char so that the resulting string does not use any of
- * the reserved characters in the reserved character set as described in
- * RFC2396. See ftp://ftp.isi.edu/in-notes/rfc2396.txt for details.
- *
- */
-public final class Base64 {
/**
- * Encode a byte array into a String
+ * This method decodes the byte array in base 64 encoding into a char array
+ * Base 64 encoding has to be according to the specification given by the
+ * RFC 1521 (5.2).
*
- * @param raw
- * the raw data to encode
- * @return String that is base64 encoded
+ * @param data the encoded byte array
+ * @return the decoded byte array
*/
- public static String encode(byte[] raw) {
- if (raw == null)
- throw new NumberFormatException(Messages.Base64_Input_Data_Not_Null);
- StringBuffer encoded = new StringBuffer();
- for (int i = 0; i < raw.length; i += 3) {
- encoded.append(encodeBlock(raw, i));
- }
- return encoded.toString();
- }
-
- protected static char[] encodeBlock(byte[] raw, int offset) {
- int block = 0;
- int slack = raw.length - offset - 1;
- int end = (slack >= 2) ? 2 : slack;
- for (int i = 0; i <= end; i++) {
- byte b = raw[offset + i];
- int neuter = (b < 0) ? b + 256 : b;
- block += neuter << (8 * (2 - i));
+ public static byte[] decodeFromCharArray(byte[] data) {
+ if (data.length == 0)
+ return data;
+ int lastRealDataIndex = data.length - 1;
+ while (data[lastRealDataIndex] == equalSign)
+ lastRealDataIndex--;
+ // original data digit is 8 bits long, but base64 digit is 6 bits long
+ int padBytes = data.length - 1 - lastRealDataIndex;
+ int byteLength = data.length * 6 / 8 - padBytes;
+ byte[] result = new byte[byteLength];
+ // Each 4 bytes of input (encoded) we end up with 3 bytes of output
+ int dataIndex = 0;
+ int resultIndex = 0;
+ int allBits = 0;
+ // how many result chunks we can process before getting to pad bytes
+ int resultChunks = (lastRealDataIndex + 1) / 4;
+ for (int i = 0; i < resultChunks; i++) {
+ allBits = 0;
+ // Loop 4 times gathering input bits (4 * 6 = 24)
+ for (int j = 0; j < 4; j++)
+ allBits = (allBits << 6) | decodeDigit(data[dataIndex++]);
+ // Loop 3 times generating output bits (3 * 8 = 24)
+ for (int j = resultIndex + 2; j >= resultIndex; j--) {
+ result[j] = (byte) (allBits & 0xff); // Bottom 8 bits
+ allBits = allBits >>> 8;
+ }
+ resultIndex += 3; // processed 3 result bytes
}
- char[] base64 = new char[4];
- for (int i = 0; i < 4; i++) {
- int sixbit = (block >>> (6 * (3 - i))) & 0x3f;
- base64[i] = getChar(sixbit);
+ // Now we do the extra bytes in case the original (non-encoded) data
+ // was not multiple of 3 bytes
+ switch (padBytes) {
+ case 1 :
+ // 1 pad byte means 3 (4-1) extra Base64 bytes of input, 18
+ // bits, of which only 16 are meaningful
+ // Or: 2 bytes of result data
+ allBits = 0;
+ // Loop 3 times gathering input bits
+ for (int j = 0; j < 3; j++)
+ allBits = (allBits << 6) | decodeDigit(data[dataIndex++]);
+ // NOTE - The code below ends up being equivalent to allBits =
+ // allBits>>>2
+ // But we code it in a non-optimized way for clarity
+ // The 4th, missing 6 bits are all 0
+ allBits = allBits << 6;
+ // The 3rd, missing 8 bits are all 0
+ allBits = allBits >>> 8;
+ // Loop 2 times generating output bits
+ for (int j = resultIndex + 1; j >= resultIndex; j--) {
+ result[j] = (byte) (allBits & 0xff); // Bottom 8
+ // bits
+ allBits = allBits >>> 8;
+ }
+ break;
+ case 2 :
+ // 2 pad bytes mean 2 (4-2) extra Base64 bytes of input, 12 bits
+ // of data, of which only 8 are meaningful
+ // Or: 1 byte of result data
+ allBits = 0;
+ // Loop 2 times gathering input bits
+ for (int j = 0; j < 2; j++)
+ allBits = (allBits << 6) | decodeDigit(data[dataIndex++]);
+ // NOTE - The code below ends up being equivalent to allBits =
+ // allBits>>>4
+ // But we code it in a non-optimized way for clarity
+ // The 3rd and 4th, missing 6 bits are all 0
+ allBits = allBits << 6;
+ allBits = allBits << 6;
+ // The 3rd and 4th, missing 8 bits are all 0
+ allBits = allBits >>> 8;
+ allBits = allBits >>> 8;
+ result[resultIndex] = (byte) (allBits & 0xff); // Bottom
+ // 8
+ // bits
+ break;
}
- // modify to use '-' instead of '='
- if (slack < 1)
- base64[2] = '-';
- if (slack < 2)
- base64[3] = '-';
- return base64;
+ return result;
}
- protected static char getChar(int sixBit) {
- if (sixBit >= 0 && sixBit <= 25)
- return (char) ('A' + sixBit);
- if (sixBit >= 26 && sixBit <= 51)
- return (char) ('a' + (sixBit - 26));
- if (sixBit >= 52 && sixBit <= 61)
- return (char) ('0' + (sixBit - 52));
- if (sixBit == 62)
- return '.';
- // modify to use '_' instead of '/'
- if (sixBit == 63)
- return '_';
- return '?';
+ /**
+ * This method converts a Base 64 digit to its numeric value.
+ *
+ * @param data digit (character) to convert
+ * @return value for the digit
+ */
+ static int decodeDigit(byte data) {
+ char charData = (char) data;
+ if (charData <= 'Z' && charData >= 'A')
+ return charData - 'A';
+ if (charData <= 'z' && charData >= 'a')
+ return charData - 'a' + 26;
+ if (charData <= '9' && charData >= '0')
+ return charData - '0' + 52;
+ switch (charData) {
+ case '+' :
+ return 62;
+ case '/' :
+ return 63;
+ default :
+ throw new IllegalArgumentException("Invalid char to decode: " + data); //$NON-NLS-1$
+ }
}
/**
- * Decode base64 string into a byte array.
+ * This method encodes the byte array into a char array in base 64 according
+ * to the specification given by the RFC 1521 (5.2).
*
- * @param base64
- * the base64 encoded string
- * @return byte[] the resulting decoded data array
- * @exception NumberFormatException
- * thrown if String not in base64 format.
+ * @param data the encoded char array
+ * @return the byte array that needs to be encoded
*/
- public static byte[] decode(String base64) throws NumberFormatException {
- int pad = 0;
- for (int i = base64.length() - 1; base64.charAt(i) == '-'; i--)
- pad++;
- int length = base64.length() * 6 / 8 - pad;
- byte[] raw = new byte[length];
- int rawIndex = 0;
- for (int i = 0; i < base64.length(); i += 4) {
- int block = (getValue(base64.charAt(i)) << 18) + (getValue(base64.charAt(i + 1)) << 12) + (getValue(base64.charAt(i + 2)) << 6) + (getValue(base64.charAt(i + 3)));
- for (int j = 0; j < 3 && rawIndex + j < raw.length; j++)
- raw[rawIndex + j] = (byte) ((block >> (8 * (2 - j))) & 0xff);
- rawIndex += 3;
+ public static byte[] encodeToCharArray(byte[] data) {
+ int sourceChunks = data.length / 3;
+ int len = ((data.length + 2) / 3) * 4;
+ byte[] result = new byte[len];
+ int extraBytes = data.length - (sourceChunks * 3);
+ // Each 4 bytes of input (encoded) we end up with 3 bytes of output
+ int dataIndex = 0;
+ int resultIndex = 0;
+ int allBits = 0;
+ for (int i = 0; i < sourceChunks; i++) {
+ allBits = 0;
+ // Loop 3 times gathering input bits (3 * 8 = 24)
+ for (int j = 0; j < 3; j++)
+ allBits = (allBits << 8) | (data[dataIndex++] & 0xff);
+ // Loop 4 times generating output bits (4 * 6 = 24)
+ for (int j = resultIndex + 3; j >= resultIndex; j--) {
+ result[j] = (byte) digits[(allBits & 0x3f)]; // Bottom
+ // 6
+ // bits
+ allBits = allBits >>> 6;
+ }
+ resultIndex += 4; // processed 4 result bytes
+ }
+ // Now we do the extra bytes in case the original (non-encoded) data
+ // is not multiple of 4 bytes
+ switch (extraBytes) {
+ case 1 :
+ allBits = data[dataIndex++]; // actual byte
+ allBits = allBits << 8; // 8 bits of zeroes
+ allBits = allBits << 8; // 8 bits of zeroes
+ // Loop 4 times generating output bits (4 * 6 = 24)
+ for (int j = resultIndex + 3; j >= resultIndex; j--) {
+ result[j] = (byte) digits[(allBits & 0x3f)]; // Bottom
+ // 6
+ // bits
+ allBits = allBits >>> 6;
+ }
+ // 2 pad tags
+ result[result.length - 1] = (byte) '=';
+ result[result.length - 2] = (byte) '=';
+ break;
+ case 2 :
+ allBits = data[dataIndex++]; // actual byte
+ allBits = (allBits << 8) | (data[dataIndex++] & 0xff); // actual
+ // byte
+ allBits = allBits << 8; // 8 bits of zeroes
+ // Loop 4 times generating output bits (4 * 6 = 24)
+ for (int j = resultIndex + 3; j >= resultIndex; j--) {
+ result[j] = (byte) digits[(allBits & 0x3f)]; // Bottom
+ // 6
+ // bits
+ allBits = allBits >>> 6;
+ }
+ // 1 pad tag
+ result[result.length - 1] = (byte) '=';
+ break;
}
- return raw;
+ return result;
}
- protected static int getValue(char c) throws NumberFormatException {
- if (c >= 'A' && c <= 'Z')
- return c - 'A';
- if (c >= 'a' && c <= 'z')
- return c - 'a' + 26;
- if (c >= '0' && c <= '9')
- return c - '0' + 52;
- if (c == '.')
- return 62;
- // modify to use '_' instead of '/'
- if (c == '_')
- return 63;
- // modify to use '-' instead of '='
- if (c == '-')
- return 0;
- throw new NumberFormatException(NLS.bind(Messages.Base64_Invalid_Value, String.valueOf(c)));
+ public static String encode(byte[] bytes) {
+ try {
+ return new String(encodeToCharArray(bytes), "ISO8859_1"); //$NON-NLS-1$
+ } catch (UnsupportedEncodingException e) {
+ throw new NullPointerException("Do not have ISO8859_1 encoder"); //$NON-NLS-1$
+ }
+ }
+
+ public static byte[] decode(String encoded) {
+ try {
+ return decodeFromCharArray(encoded.getBytes("ISO8859_1")); //$NON-NLS-1$
+ } catch (UnsupportedEncodingException e) {
+ throw new NullPointerException("Do not have ISO8859_1 encoder"); //$NON-NLS-1$
+ }
}
-} \ No newline at end of file
+}

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