Load cups into easysw/current.

[thirdparty/cups.git] / scripting / java / src / com / easysw / cups / Base64Coder.java

diff --git a/scripting/java/src/com/easysw/cups/Base64Coder.java b/scripting/java/src/com/easysw/cups/Base64Coder.java
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+++ b/scripting/java/src/com/easysw/cups/Base64Coder.java
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+package com.easysw.cups;
+
+/**
+* A Base64 Encoder/Decoder.
+*
+* <p>
+* This class is used to encode and decode data in Base64 format as described in RFC 1521.
+*
+* <p>
+* This is "Open Source" software and released under the <a href="http://www.gnu.org/licenses/lgpl.html">GNU/LGPL</a> license.<br>
+* It is provided "as is" without warranty of any kind.<br>
+* Copyright 2003: Christian d'Heureuse, Inventec Informatik AG, Switzerland.<br>
+* Home page: <a href="http://www.source-code.biz">www.source-code.biz</a><br>
+*
+* <p>
+* Version history:<br>
+* 2003-07-22 Christian d'Heureuse (chdh): Module created.<br>
+* 2005-08-11 chdh: Lincense changed from GPL to LGPL.<br>
+* 2006-11-21 chdh:<br>
+*  &nbsp; Method encode(String) renamed to encodeString(String).<br>
+*  &nbsp; Method decode(String) renamed to decodeString(String).<br>
+*  &nbsp; New method encode(byte[],int) added.<br>
+*  &nbsp; New method decode(String) added.<br>
+*/
+
+public class Base64Coder {
+
+// Mapping table from 6-bit nibbles to Base64 characters.
+private static char[]    map1 = new char[64];
+   static {
+      int i=0;
+      for (char c='A'; c<='Z'; c++) map1[i++] = c;
+      for (char c='a'; c<='z'; c++) map1[i++] = c;
+      for (char c='0'; c<='9'; c++) map1[i++] = 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) {
+   return new String(encode(s.getBytes())); }
+
+/**
+* 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 char[] 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 char[] 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
+   char[] out = new char[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] : '='; op++;
+      out[op] = op < oDataLen ? map1[o3] : '='; 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) {
+   return decode(s.toCharArray()); }
+
+/**
+* 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 (char[] 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; }
+
+// Dummy constructor.
+private Base64Coder() {}
+
+} // end class Base64Coder