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/**
* Copyright (c) 2011, 2013, Jonathan Giles, Johan Vos, Hendrik Ebbers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of DataFX, the website javafxdata.org, nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.datafx.reader;
import java.io.ByteArrayOutputStream;
class Base64 {
private final static String base64 =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
public static byte[] decode(String encoded) {
int i;
byte output[] = new byte[3];
int state;
ByteArrayOutputStream data = new ByteArrayOutputStream(encoded.length());
state = 1;
for (i = 0; i < encoded.length(); i++) {
byte c;
{
char alpha = encoded.charAt(i);
if (Character.isWhitespace(alpha)) {
continue;
}
if ((alpha >= 'A') && (alpha <= 'Z')) {
c = (byte) (alpha - 'A');
} else if ((alpha >= 'a') && (alpha <= 'z')) {
c = (byte) (26 + (alpha - 'a'));
} else if ((alpha >= '0') && (alpha <= '9')) {
c = (byte) (52 + (alpha - '0'));
} else if (alpha == '+') {
c = 62;
} else if (alpha == '/') {
c = 63;
} else if (alpha == '=') {
break;
} else {
return null;
}
}
switch (state) {
case 1:
output[0] = (byte) (c << 2);
break;
case 2:
output[0] |= (byte) (c >>> 4);
output[1] = (byte) ((c & 0x0F) << 4);
break;
case 3:
output[1] |= (byte) (c >>> 2);
output[2] = (byte) ((c & 0x03) << 6);
break;
case 4:
output[2] |= c;
data.write(output, 0, output.length);
break;
}
state = (state < 4 ? state + 1 : 1);
}
if (i < encoded.length()) {
switch (state) {
case 3:
data.write(output, 0, 1);
return (encoded.charAt(i) == '=') && (encoded.charAt(i + 1) == '=')
? data.toByteArray() : null;
case 4:
data.write(output, 0, 2);
return (encoded.charAt(i) == '=') ? data.toByteArray() : null;
default:
return null;
}
} else {
return (state == 1 ? data.toByteArray() : null);
}
}
public static String encode(byte[] data) {
char output[] = new char[4];
int state = 1;
int restbits = 0;
int chunks = 0;
StringBuilder encoded = new StringBuilder();
for (int i = 0; i < data.length; i++) {
int ic = (data[i] >= 0 ? data[i] : (data[i] & 0x7F) + 128);
switch (state) {
case 1:
output[0] = base64.charAt(ic >>> 2);
restbits = ic & 0x03;
break;
case 2:
output[1] = base64.charAt((restbits << 4) | (ic >>> 4));
restbits = ic & 0x0F;
break;
case 3:
output[2] = base64.charAt((restbits << 2) | (ic >>> 6));
output[3] = base64.charAt(ic & 0x3F);
encoded.append(output);
chunks++;
if ((chunks % 19) == 0) {
encoded.append("\r\n");
}
break;
}
state = (state < 3 ? state + 1 : 1);
}
switch (state) {
case 2:
output[1] = base64.charAt((restbits << 4));
output[2] = output[3] = '=';
encoded.append(output);
break;
case 3:
output[2] = base64.charAt((restbits << 2));
output[3] = '=';
encoded.append(output);
break;
}
return encoded.toString();
}
}
