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/*
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*
* Copyright (c) 2012 Oracle and/or its affiliates. All rights reserved.
*
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* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
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* http://glassfish.java.net/public/CDDL+GPL_1_1.html
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* language governing permissions and limitations under the License.
*
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*
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* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
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*/
package org.glassfish.jersey.internal.util;
import java.io.UnsupportedEncodingException;
/**
* Utility class that implements base64 encoding and decoding.
*
* @author Martin Matula (martin.matula at oracle.com)
*/
public class Base64 {
private static final byte[] CHAR_SET;
static {
String s = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
byte[] cs;
try {
cs = s.getBytes("ASCII");
} catch (UnsupportedEncodingException ex) {
// should never happen
cs = s.getBytes();
}
CHAR_SET = cs;
}
static final byte BASE64INDEXES[] = {
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
64, 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, 64, 64, 64, 64, 64,
64, 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, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
};
/**
* Encodes array of bytes using base64 encoding.
*
* @param buffer Array of bytes to be encoded.
* @return Encoded result as an array of bytes.
*/
public static byte[] encode(byte[] buffer) {
int ccount = buffer.length / 3;
int rest = buffer.length % 3;
byte[] result = new byte[(ccount + (rest > 0 ? 1 : 0)) * 4];
for (int i = 0; i < ccount; i++) {
result[i * 4] = CHAR_SET[(buffer[i * 3] >> 2) & 0xff];
result[i * 4 + 1] = CHAR_SET[(((buffer[i * 3] & 0x03) << 4) | (buffer[i * 3 + 1] >> 4)) & 0xff];
result[i * 4 + 2] = CHAR_SET[(((buffer[i * 3 + 1] & 0x0f) << 2) | (buffer[i * 3 + 2] >> 6)) & 0xff];
result[i * 4 + 3] = CHAR_SET[buffer[i * 3 + 2] & 0x3f];
}
int temp = 0;
if (rest > 0) {
if (rest == 2) {
result[ccount * 4 + 2] = CHAR_SET[((buffer[ccount * 3 + 1] & 0x0f) << 2) & 0xff];
temp = buffer[ccount * 3 + 1] >> 4;
} else {
result[ccount * 4 + 2] = CHAR_SET[CHAR_SET.length - 1];
}
result[ccount * 4 + 3] = CHAR_SET[CHAR_SET.length - 1];
result[ccount * 4 + 1] = CHAR_SET[(((buffer[ccount * 3] & 0x03) << 4) | temp) & 0xff];
result[ccount * 4] = CHAR_SET[(buffer[ccount * 3] >> 2) & 0xff];
}
return result;
}
/**
* Decodes Base64 data into octects.
*
* @param buffer Byte array containing Base64 data
* @return Array containing decoded data.
*/
public static byte[] decode(byte[] buffer) {
if(buffer.length < 4 && (buffer.length % 4) != 0) {
return new byte[0];
}
int ccount = buffer.length / 4;
int paddingCount = (buffer[buffer.length - 1] == '=' ? 1 : 0) + (buffer[buffer.length - 2] == '=' ? 1 : 0);
byte[] result = new byte[3 * (ccount-1) + (3 - paddingCount)];
for (int i = 0; i < (ccount-1); i++) {
result[i * 3] = (byte) ((BASE64INDEXES[buffer[i * 4]] << 2) | (BASE64INDEXES[buffer[i * 4 + 1]] >> 4));
result[i * 3 + 1] = (byte) ((BASE64INDEXES[buffer[i * 4 + 1]] << 4) | (BASE64INDEXES[buffer[i * 4 + 2]] >> 2));
result[i * 3 + 2] = (byte) ((BASE64INDEXES[buffer[i * 4 + 2]] << 6) | BASE64INDEXES[buffer[i * 4 + 3]]);
}
int i = ccount-1;
switch (paddingCount) {
case 0:
result[i * 3 + 2] = (byte) ((BASE64INDEXES[buffer[i * 4 + 2]] << 6) | BASE64INDEXES[buffer[i * 4 + 3]]);
case 1:
result[i * 3 + 1] = (byte) ((BASE64INDEXES[buffer[i * 4 + 1]] << 4) | (BASE64INDEXES[buffer[i * 4 + 2]] >> 2));
case 2:
result[i * 3] = (byte) ((BASE64INDEXES[buffer[i * 4]] << 2) | (BASE64INDEXES[buffer[i * 4 + 1]] >> 4));
}
return result;
}
/**
* Encodes array of bytes using base64 encoding and returns the result as a string.
*
* @param buffer Array of bytes to be encoded.
* @return Resulting encoded string.
*/
public static String encodeAsString(byte[] buffer) {
byte[] result = encode(buffer);
try {
return new String(result, "ASCII");
} catch (UnsupportedEncodingException ex) {
// should never happen
return new String(result);
}
}
/**
* Encodes a string using base64 and returns the result as another string.
*
* @param text String to be encoded.
* @return Resulting encoded string.
*/
public static String encodeAsString(String text) {
return encodeAsString(text.getBytes());
}
/**
* Decodes array of bytes using base64 decoding and returns the result as a string.
*
* @param buffer Array of bytes to be decoded.
* @return Resulting decoded string.
*/
public static String decodeAsString(byte[] buffer) {
byte[] result = decode(buffer);
try {
return new String(result, "ASCII");
} catch (UnsupportedEncodingException ex) {
// should never happen
return new String(result);
}
}
/**
* Decodes a string using base64 and returns the result as another string.
*
* @param text String to be decoded.
* @return Resulting decoded string.
*/
public static String decodeAsString(String text) {
return decodeAsString(text.getBytes());
}
}
