package org.apache.axiom.om.util; | |
import java.io.IOException; | |
import java.io.OutputStream; | |
import java.io.Writer; | |
/* | |
* Copyright 2001-2004 The Apache Software Foundation. | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
* | |
*/ | |
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; | |
} | |
/** | |
* | |
*/ | |
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 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); | |
} | |
} | |
} |