| /* |
| * Copyright 2004,2005 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. |
| */ |
| |
| package org.apache.axis2.util; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.io.Writer; |
| |
| 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); |
| } |
| } |
| } |