package com.iambookmaster.client.common;
import java.io.UnsupportedEncodingException;
/**
* Source: http://www.source-code.biz/snippets/java/2.htm
* @author ggadyatskiy
*
*/
public class Base64Coder {
private static final byte BYTE_EQUAL = (byte)'=';
// Mapping table from 6-bit nibbles to Base64 characters.
private static byte[] map1 = new byte[64];
static {
int i=0;
for (char c='A'; c<='Z'; c++) map1[i++] = (byte)c;
for (char c='a'; c<='z'; c++) map1[i++] = (byte)c;
for (char c='0'; c<='9'; c++) map1[i++] = (byte)c;
map1[i++] = '+'; map1[i++] = '/'; }
// Mapping table from Base64 characters to 6-bit nibbles.
private static byte[] map2 = new byte[128];
static {
for (int i=0; i<map2.length; i++) map2[i] = -1;
for (int i=0; i<64; i++) map2[map1[i]] = (byte)i;
}
/**
* Encodes a string into Base64 format.
* No blanks or line breaks are inserted.
* @param s a String to be encoded.
* @return A String with the Base64 encoded data.
*/
public static String encodeString (String s) {
try {
return new String(encode(s.getBytes("UTF-8")));
} catch (UnsupportedEncodingException e) {
return null;
}
}
/**
* Encodes a byte array into Base64 format.
* No blanks or line breaks are inserted.
* @param in an array containing the data bytes to be encoded.
* @return A character array with the Base64 encoded data.
*/
public static byte[] encode (byte[] in) {
return encode(in,in.length); }
/**
* Encodes a byte array into Base64 format.
* No blanks or line breaks are inserted.
* @param in an array containing the data bytes to be encoded.
* @param iLen number of bytes to process in <code>in</code>.
* @return A character array with the Base64 encoded data.
*/
public static byte[] encode (byte[] in, int iLen) {
int oDataLen = (iLen*4+2)/3; // output length without padding
int oLen = ((iLen+2)/3)*4; // output length including padding
byte[] out = new byte[oLen];
int ip = 0;
int op = 0;
while (ip < iLen) {
int i0 = in[ip++] & 0xff;
int i1 = ip < iLen ? in[ip++] & 0xff : 0;
int i2 = ip < iLen ? in[ip++] & 0xff : 0;
int o0 = i0 >>> 2;
int o1 = ((i0 & 3) << 4) | (i1 >>> 4);
int o2 = ((i1 & 0xf) << 2) | (i2 >>> 6);
int o3 = i2 & 0x3F;
out[op++] = map1[o0];
out[op++] = map1[o1];
out[op] = op < oDataLen ? map1[o2] : BYTE_EQUAL; op++;
out[op] = op < oDataLen ? map1[o3] : BYTE_EQUAL; op++;
}
return out; }
/**
* Decodes a string from Base64 format.
* @param s a Base64 String to be decoded.
* @return A String containing the decoded data.
* @throws IllegalArgumentException if the input is not valid Base64 encoded data.
*/
public static String decodeString (String s) {
return new String(decode(s)); }
/**
* Decodes a byte array from Base64 format.
* @param s a Base64 String to be decoded.
* @return An array containing the decoded data bytes.
* @throws IllegalArgumentException if the input is not valid Base64 encoded data.
*/
public static byte[] decode (String s) {
try {
return decode(s.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
return null;
}
}
/**
* Decodes a byte array from Base64 format.
* @param s a Base64 String to be decoded.
* @return An array containing the decoded data bytes.
* @throws IllegalArgumentException if the input is not valid Base64 encoded data.
*/
public static String decode (String s,String encoding) {
try {
return new String(decode(s.getBytes()),encoding);
} catch (UnsupportedEncodingException e) {
return null;
}
}
/**
* Decodes a byte array from Base64 format.
* No blanks or line breaks are allowed within the Base64 encoded data.
* @param in a character array containing the Base64 encoded data.
* @return An array containing the decoded data bytes.
* @throws IllegalArgumentException if the input is not valid Base64 encoded data.
*/
public static byte[] decode (byte[] in) {
int iLen = in.length;
if (iLen%4 != 0) throw new IllegalArgumentException ("Length of Base64 encoded input string is not a multiple of 4.");
while (iLen > 0 && in[iLen-1] == '=') iLen--;
int oLen = (iLen*3) / 4;
byte[] out = new byte[oLen];
int ip = 0;
int op = 0;
while (ip < iLen) {
int i0 = in[ip++];
int i1 = in[ip++];
int i2 = ip < iLen ? in[ip++] : 'A';
int i3 = ip < iLen ? in[ip++] : 'A';
if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127)
throw new IllegalArgumentException ("Illegal character in Base64 encoded data.");
int b0 = map2[i0];
int b1 = map2[i1];
int b2 = map2[i2];
int b3 = map2[i3];
if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0)
throw new IllegalArgumentException ("Illegal character in Base64 encoded data.");
int o0 = ( b0 <<2) | (b1>>>4);
int o1 = ((b1 & 0xf)<<4) | (b2>>>2);
int o2 = ((b2 & 3)<<6) | b3;
out[op++] = (byte)o0;
if (op<oLen) out[op++] = (byte)o1;
if (op<oLen) out[op++] = (byte)o2; }
return out;
}
// /**
// * Decodes a byte array from Base64 format.
// * No blanks or line breaks are allowed within the Base64 encoded data.
// * @param in a character array containing the Base64 encoded data.
// * @return An array containing the decoded data bytes.
// * @throws IllegalArgumentException if the input is not valid Base64 encoded data.
// */
// public static byte[] decode (b[] in) {
// int iLen = in.length;
// if (iLen%4 != 0) throw new IllegalArgumentException ("Length of Base64 encoded input string is not a multiple of 4.");
// while (iLen > 0 && in[iLen-1] == '=') iLen--;
// int oLen = (iLen*3) / 4;
// byte[] out = new byte[oLen];
// int ip = 0;
// int op = 0;
// while (ip < iLen) {
// int i0 = in[ip++];
// int i1 = in[ip++];
// int i2 = ip < iLen ? in[ip++] : 'A';
// int i3 = ip < iLen ? in[ip++] : 'A';
// if (i0 > 127 || i1 > 127 || i2 > 127 || i3 > 127)
// throw new IllegalArgumentException ("Illegal character in Base64 encoded data.");
// int b0 = map2[i0];
// int b1 = map2[i1];
// int b2 = map2[i2];
// int b3 = map2[i3];
// if (b0 < 0 || b1 < 0 || b2 < 0 || b3 < 0)
// throw new IllegalArgumentException ("Illegal character in Base64 encoded data.");
// int o0 = ( b0 <<2) | (b1>>>4);
// int o1 = ((b1 & 0xf)<<4) | (b2>>>2);
// int o2 = ((b2 & 3)<<6) | b3;
// out[op++] = (byte)o0;
// if (op<oLen) out[op++] = (byte)o1;
// if (op<oLen) out[op++] = (byte)o2; }
// return out; }
public static void main(String[] params) {
if (params.length>0) {
System.out.println(encodeString(params[0]));
} else {
System.err.println("Set text in command line");
}
}
}