Base64.java
/*
** Module :Base64.java
** Abstract :String <-> byte array conversion using base64 encoding.
**
** Copyright (c) 2004-2020, Golden Code Development Corporation.
**
** -#- -I- --Date-- --JPRM-- -----------------------------------Description-----------------------------------
** 001 SIY 20041228 @20014 Created initial version
** 002 SIY 20050224 @20014 Updated for use by Directory package.
** 003 SIY 20050310 @20353 Organized imports.
** 004 SIY 20050323 @20467 Fixed formatting and comments.
** 005 SIY 20050429 @21006 Fixed formatting.
** 006 CA 20200519 Added safeBase64ToByteArray.
*/
/*
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU Affero General Public License as
** published by the Free Software Foundation, either version 3 of the
** License, or (at your option) any later version.
**
** This program 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 Affero General Public License for more details.
**
** You may find a copy of the GNU Affero GPL version 3 at the following
** location: https://www.gnu.org/licenses/agpl-3.0.en.html
**
** Additional terms under GNU Affero GPL version 3 section 7:
**
** Under Section 7 of the GNU Affero GPL version 3, the following additional
** terms apply to the works covered under the License. These additional terms
** are non-permissive additional terms allowed under Section 7 of the GNU
** Affero GPL version 3 and may not be removed by you.
**
** 0. Attribution Requirement.
**
** You must preserve all legal notices or author attributions in the covered
** work or Appropriate Legal Notices displayed by works containing the covered
** work. You may not remove from the covered work any author or developer
** credit already included within the covered work.
**
** 1. No License To Use Trademarks.
**
** This license does not grant any license or rights to use the trademarks
** Golden Code, FWD, any Golden Code or FWD logo, or any other trademarks
** of Golden Code Development Corporation. You are not authorized to use the
** name Golden Code, FWD, or the names of any author or contributor, for
** publicity purposes without written authorization.
**
** 2. No Misrepresentation of Affiliation.
**
** You may not represent yourself as Golden Code Development Corporation or FWD.
**
** You may not represent yourself for publicity purposes as associated with
** Golden Code Development Corporation, FWD, or any author or contributor to
** the covered work, without written authorization.
**
** 3. No Misrepresentation of Source or Origin.
**
** You may not represent the covered work as solely your work. All modified
** versions of the covered work must be marked in a reasonable way to make it
** clear that the modified work is not originating from Golden Code Development
** Corporation or FWD. All modified versions must contain the notices of
** attribution required in this license.
*/
package com.goldencode.p2j.directory;
import java.io.ByteArrayOutputStream;
/**
* This class provides static methods to perform base64 encoding/decoding.
* Code is based on the base64 implementation from the RXIP project. Note that
* resulting base64 output is not completely conforms canonical rules: it does
* not split string into chunks at most 76 chars long separated by CRLF
* sequence.
*
* @author SIY
* @version 1.0
*/
public class Base64
{
/**
* Character conversion table from RFC2045
*
* Value Encoding Value Encoding Value Encoding Value Encoding
* 0 A 17 R 34 i 51 z
* 1 B 18 S 35 j 52 0
* 2 C 19 T 36 k 53 1
* 3 D 20 U 37 l 54 2
* 4 E 21 V 38 m 55 3
* 5 F 22 W 39 n 56 4
* 6 G 23 X 40 o 57 5
* 7 H 24 Y 41 p 58 6
* 8 I 25 Z 42 q 59 7
* 9 J 26 a 43 r 60 8
* 10 K 27 b 44 s 61 9
* 11 L 28 c 45 t 62 +
* 12 M 29 d 46 u 63 /
* 13 N 30 e 47 v
* 14 O 31 f 48 w (pad) =
* 15 P 32 g 49 x
* 16 Q 33 h 50 y
*/
private static char table1[]=
{
'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', '+', '/',
'='
};
/**
* Decode input <code>String</code> into byte array.
* <p>
* If the input's length is not a multiple of 4, chars will be removed from its end.
* <p>
* If the input is null, then the returned value will be null.
*
* @param input
* Source data consisting.
*
* @return byte array converted into <code>String</code> consisting characters from limited range.
*/
public static byte[] safeBase64ToByteArray(String input)
{
if (input == null)
{
return null;
}
String s = "";
for (int i = 0; i < input.length(); i++)
{
char c = input.charAt(i);
if (c == '+' || c == '/' || c == '=' ||
(c >= '0' && c <= '9') ||
(c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z'))
{
s = s + c;
}
}
while (s.length() % 4 != 0)
{
s = s.substring(0, s.length() - 1);
}
return base64ToByteArray(s);
}
/**
* Convert input byte array into <code>String</code>.
*
* @param src
* Input byte array.
* @return byte array converted into <code>String</code> consisting
* characters from limited range.
*/
static public String byteArrayToBase64(byte[] src)
{
if (src == null)
return null;
int cout[] = new int[4];
char buf[] = new char[(src.length + 2) * 2];
int iOut = 0;
int iPos = 0;
while (iPos < src.length)
{
cout[0] = (src[iPos] & 0xFC) >> 2;
cout[1] = (src[iPos] & 0x03) << 4;
iPos++;
if (iPos == src.length)
{
cout[2] = 64;
}
else
{
cout[1] |= (src[iPos] & 0xF0) >> 4;
cout[2] = (src[iPos] & 0x0F) << 2;
iPos++;
}
if (iPos == src.length)
{
cout[3] = 64;
}
else
{
cout[2] |= (src[iPos] & 0xC0) >> 6;
cout[3] = (src[iPos] & 0x3F);
iPos++;
}
buf[iOut++] = table1[cout[0]];
buf[iOut++] = table1[cout[1]];
buf[iOut++] = table1[cout[2]];
buf[iOut++] = table1[cout[3]];
}
return new String(buf, 0, iOut);
}
/**
* Decode input <code>String</code> into byte array.
*
* @param input
* Source data consisting.
* @return decoded byte array.
*/
static public byte[] base64ToByteArray(String input)
{
if (input == null)
return null;
ByteArrayOutputStream buf = new ByteArrayOutputStream(input.length());
int uBuf = 0;
int iCnt = 0;
for (int i = 0; i < input.length(); i++)
{
int chr = input.charAt(i);
do
{
if (chr >= 'A' && chr <= 'Z')
{
uBuf <<= 6;
uBuf |= (chr - 'A') & 0x3F;
iCnt += 6;
break;
}
if (chr >= 'a' && chr <= 'z')
{
uBuf <<= 6;
uBuf |= (chr - 'a' + 26) & 0x3F;
iCnt += 6;
break;
}
if (chr >= '0' && chr <= '9')
{
uBuf <<= 6;
uBuf |= (chr - '0' + 52) & 0x3F;
iCnt += 6;
break;
}
if (chr == '+' || chr == '/')
{
uBuf <<= 6;
uBuf |= ((chr == '+') ? 62 : 63) & 0x3F;
iCnt += 6;
break;
}
continue;
}
while (false);
if (iCnt >= 8)
{
buf.write((uBuf >> (iCnt - 8)) & 0xFF);
iCnt -= 8;
}
}
try
{
buf.close();
}
catch (Exception e)
{
}
return buf.toByteArray();
}
}