org.fabric3.spi.util.Base64 Maven / Gradle / Ivy
/*
* Fabric3
* Copyright (c) 2009-2011 Metaform Systems
*
* Fabric3 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 3 of
* the License, or (at your option) any later version, with the
* following exception:
*
* Linking this software statically or dynamically with other
* modules is making a combined work based on this software.
* Thus, the terms and conditions of the GNU General Public
* License cover the whole combination.
*
* As a special exception, the copyright holders of this software
* give you permission to link this software with independent
* modules to produce an executable, regardless of the license
* terms of these independent modules, and to copy and distribute
* the resulting executable under terms of your choice, provided
* that you also meet, for each linked independent module, the
* terms and conditions of the license of that module. An
* independent module is a module which is not derived from or
* based on this software. If you modify this software, you may
* extend this exception to your version of the software, but
* you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version.
*
* Fabric3 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 Fabric3.
* If not, see This class implements section 6.8. Base64
* Content-Transfer-Encoding from RFC 2045 Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message
* Bodies by Freed and Borenstein.
*
* @version $Rev: 9763 $ $Date: 2011-01-03 00:48:06 +0000 (Mon, 03 Jan 2011) $
*/
public class Base64 {
private static final char[] S_BASE64CHAR = {'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', '+', '/'};
private static final char S_BASE64PAD = '=';
private static final byte[] S_DECODETABLE = new byte[128];
static {
for (int i = 0; i < S_DECODETABLE.length; i++)
S_DECODETABLE[i] = Byte.MAX_VALUE; // 127
for (int i = 0; i < S_BASE64CHAR.length; i++)
// 0 to 63
S_DECODETABLE[S_BASE64CHAR[i]] = (byte) i;
}
private static int decode0(char[] ibuf, byte[] obuf, int wp) {
int outlen = 3;
if (ibuf[3] == S_BASE64PAD)
outlen = 2;
if (ibuf[2] == S_BASE64PAD)
outlen = 1;
int b0 = S_DECODETABLE[ibuf[0]];
int b1 = S_DECODETABLE[ibuf[1]];
int b2 = S_DECODETABLE[ibuf[2]];
int b3 = S_DECODETABLE[ibuf[3]];
switch (outlen) {
case 1:
obuf[wp] = (byte) (b0 << 2 & 0xfc | b1 >> 4 & 0x3);
return 1;
case 2:
obuf[wp++] = (byte) (b0 << 2 & 0xfc | b1 >> 4 & 0x3);
obuf[wp] = (byte) (b1 << 4 & 0xf0 | b2 >> 2 & 0xf);
return 2;
case 3:
obuf[wp++] = (byte) (b0 << 2 & 0xfc | b1 >> 4 & 0x3);
obuf[wp++] = (byte) (b1 << 4 & 0xf0 | b2 >> 2 & 0xf);
obuf[wp] = (byte) (b2 << 6 & 0xc0 | b3 & 0x3f);
return 3;
default:
throw new RuntimeException("internalError00");
}
}
/**
*
*/
public static byte[] decode(char[] data, int off, int len) {
char[] ibuf = new char[4];
int ibufcount = 0;
byte[] obuf = new byte[len / 4 * 3 + 3];
int obufcount = 0;
for (int i = off; i < off + len; i++) {
char ch = data[i];
if (ch == S_BASE64PAD || ch < S_DECODETABLE.length
&& S_DECODETABLE[ch] != Byte.MAX_VALUE) {
ibuf[ibufcount++] = ch;
if (ibufcount == ibuf.length) {
ibufcount = 0;
obufcount += decode0(ibuf, obuf, obufcount);
}
}
}
if (obufcount == obuf.length)
return obuf;
byte[] ret = new byte[obufcount];
System.arraycopy(obuf, 0, ret, 0, obufcount);
return ret;
}
/**
*
*/
public static byte[] decode(String data) {
char[] ibuf = new char[4];
int ibufcount = 0;
byte[] obuf = new byte[data.length() / 4 * 3 + 3];
int obufcount = 0;
for (int i = 0; i < data.length(); i++) {
char ch = data.charAt(i);
if (ch == S_BASE64PAD || ch < S_DECODETABLE.length
&& S_DECODETABLE[ch] != Byte.MAX_VALUE) {
ibuf[ibufcount++] = ch;
if (ibufcount == ibuf.length) {
ibufcount = 0;
obufcount += decode0(ibuf, obuf, obufcount);
}
}
}
if (obufcount == obuf.length)
return obuf;
byte[] ret = new byte[obufcount];
System.arraycopy(obuf, 0, ret, 0, obufcount);
return ret;
}
/**
* checks input string for invalid Base64 characters
*
* @param data
* @return true, if String contains only valid Base64 characters. false, otherwise
*/
public static boolean isValidBase64Encoding(String data) {
for (int i = 0; i < data.length(); i++) {
char ch = data.charAt(i);
if (ch == S_BASE64PAD || ch < S_DECODETABLE.length
&& S_DECODETABLE[ch] != Byte.MAX_VALUE) {
//valid character.Do nothing
} else if (ch == '\r' || ch == '\n') {
//do nothing
} else {
return false;
}
}//iterate over all characters in the string
return true;
}
/**
*
*/
public static void decode(char[] data, int off, int len,
OutputStream ostream) throws IOException {
char[] ibuf = new char[4];
int ibufcount = 0;
byte[] obuf = new byte[3];
for (int i = off; i < off + len; i++) {
char ch = data[i];
if (ch == S_BASE64PAD || ch < S_DECODETABLE.length
&& S_DECODETABLE[ch] != Byte.MAX_VALUE) {
ibuf[ibufcount++] = ch;
if (ibufcount == ibuf.length) {
ibufcount = 0;
int obufcount = decode0(ibuf, obuf, 0);
ostream.write(obuf, 0, obufcount);
}
}
}
}
/**
*
*/
public static void decode(String data, OutputStream ostream)
throws IOException {
char[] ibuf = new char[4];
int ibufcount = 0;
byte[] obuf = new byte[3];
for (int i = 0; i < data.length(); i++) {
char ch = data.charAt(i);
if (ch == S_BASE64PAD || ch < S_DECODETABLE.length
&& S_DECODETABLE[ch] != Byte.MAX_VALUE) {
ibuf[ibufcount++] = ch;
if (ibufcount == ibuf.length) {
ibufcount = 0;
int obufcount = decode0(ibuf, obuf, 0);
ostream.write(obuf, 0, obufcount);
}
}
}
}
/**
* Returns base64 representation of specified byte array.
*/
public static String encode(byte[] data) {
return encode(data, 0, data.length);
}
/**
* Returns base64 representation of specified byte array.
*/
public static String encode(byte[] data, int off, int len) {
if (len <= 0)
return "";
char[] out = new char[len / 3 * 4 + 4];
int rindex = off;
int windex = 0;
int rest = len - off;
while (rest >= 3) {
int i = ((data[rindex] & 0xff) << 16)
+ ((data[rindex + 1] & 0xff) << 8)
+ (data[rindex + 2] & 0xff);
out[windex++] = S_BASE64CHAR[i >> 18];
out[windex++] = S_BASE64CHAR[(i >> 12) & 0x3f];
out[windex++] = S_BASE64CHAR[(i >> 6) & 0x3f];
out[windex++] = S_BASE64CHAR[i & 0x3f];
rindex += 3;
rest -= 3;
}
if (rest == 1) {
int i = data[rindex] & 0xff;
out[windex++] = S_BASE64CHAR[i >> 2];
out[windex++] = S_BASE64CHAR[(i << 4) & 0x3f];
out[windex++] = S_BASE64PAD;
out[windex++] = S_BASE64PAD;
} else if (rest == 2) {
int i = ((data[rindex] & 0xff) << 8) + (data[rindex + 1] & 0xff);
out[windex++] = S_BASE64CHAR[i >> 10];
out[windex++] = S_BASE64CHAR[(i >> 4) & 0x3f];
out[windex++] = S_BASE64CHAR[(i << 2) & 0x3f];
out[windex++] = S_BASE64PAD;
}
return new String(out, 0, windex);
}
/**
* Outputs base64 representation of the specified byte array to the specified String Buffer
*/
public static void encode(byte[] data, int off, int len, StringBuffer buffer) {
if (len <= 0) {
return;
}
char[] out = new char[4];
int rindex = off;
int rest = len - off;
while (rest >= 3) {
int i = ((data[rindex] & 0xff) << 16)
+ ((data[rindex + 1] & 0xff) << 8)
+ (data[rindex + 2] & 0xff);
out[0] = S_BASE64CHAR[i >> 18];
out[1] = S_BASE64CHAR[(i >> 12) & 0x3f];
out[2] = S_BASE64CHAR[(i >> 6) & 0x3f];
out[3] = S_BASE64CHAR[i & 0x3f];
buffer.append(out);
rindex += 3;
rest -= 3;
}
if (rest == 1) {
int i = data[rindex] & 0xff;
out[0] = S_BASE64CHAR[i >> 2];
out[1] = S_BASE64CHAR[(i << 4) & 0x3f];
out[2] = S_BASE64PAD;
out[3] = S_BASE64PAD;
buffer.append(out);
} else if (rest == 2) {
int i = ((data[rindex] & 0xff) << 8) + (data[rindex + 1] & 0xff);
out[0] = S_BASE64CHAR[i >> 10];
out[1] = S_BASE64CHAR[(i >> 4) & 0x3f];
out[2] = S_BASE64CHAR[(i << 2) & 0x3f];
out[3] = S_BASE64PAD;
buffer.append(out);
}
}
/**
* Outputs base64 representation of the specified byte array to a byte stream.
*/
public static void encode(byte[] data, int off, int len,
OutputStream ostream) throws IOException {
if (len <= 0)
return;
byte[] out = new byte[4];
int rindex = off;
int rest = len - off;
while (rest >= 3) {
int i = ((data[rindex] & 0xff) << 16)
+ ((data[rindex + 1] & 0xff) << 8)
+ (data[rindex + 2] & 0xff);
out[0] = (byte) S_BASE64CHAR[i >> 18];
out[1] = (byte) S_BASE64CHAR[(i >> 12) & 0x3f];
out[2] = (byte) S_BASE64CHAR[(i >> 6) & 0x3f];
out[3] = (byte) S_BASE64CHAR[i & 0x3f];
ostream.write(out, 0, 4);
rindex += 3;
rest -= 3;
}
if (rest == 1) {
int i = data[rindex] & 0xff;
out[0] = (byte) S_BASE64CHAR[i >> 2];
out[1] = (byte) S_BASE64CHAR[(i << 4) & 0x3f];
out[2] = (byte) S_BASE64PAD;
out[3] = (byte) S_BASE64PAD;
ostream.write(out, 0, 4);
} else if (rest == 2) {
int i = ((data[rindex] & 0xff) << 8) + (data[rindex + 1] & 0xff);
out[0] = (byte) S_BASE64CHAR[i >> 10];
out[1] = (byte) S_BASE64CHAR[(i >> 4) & 0x3f];
out[2] = (byte) S_BASE64CHAR[(i << 2) & 0x3f];
out[3] = (byte) S_BASE64PAD;
ostream.write(out, 0, 4);
}
}
/**
* Outputs base64 representation of the specified byte array to a character stream.
*/
public static void encode(byte[] data, int off, int len, Writer writer)
throws IOException {
if (len <= 0)
return;
char[] out = new char[4];
int rindex = off;
int rest = len - off;
int output = 0;
while (rest >= 3) {
int i = ((data[rindex] & 0xff) << 16)
+ ((data[rindex + 1] & 0xff) << 8)
+ (data[rindex + 2] & 0xff);
out[0] = S_BASE64CHAR[i >> 18];
out[1] = S_BASE64CHAR[(i >> 12) & 0x3f];
out[2] = S_BASE64CHAR[(i >> 6) & 0x3f];
out[3] = S_BASE64CHAR[i & 0x3f];
writer.write(out, 0, 4);
rindex += 3;
rest -= 3;
output += 4;
if (output % 76 == 0)
writer.write("\n");
}
if (rest == 1) {
int i = data[rindex] & 0xff;
out[0] = S_BASE64CHAR[i >> 2];
out[1] = S_BASE64CHAR[(i << 4) & 0x3f];
out[2] = S_BASE64PAD;
out[3] = S_BASE64PAD;
writer.write(out, 0, 4);
} else if (rest == 2) {
int i = ((data[rindex] & 0xff) << 8) + (data[rindex + 1] & 0xff);
out[0] = S_BASE64CHAR[i >> 10];
out[1] = S_BASE64CHAR[(i >> 4) & 0x3f];
out[2] = S_BASE64CHAR[(i << 2) & 0x3f];
out[3] = S_BASE64PAD;
writer.write(out, 0, 4);
}
}
}