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1
25 package com.scalagent.ksoap.marshal;
26
27 import java.io.*;
28
29 public class Base64 {
30 static final char[] charTab =
31 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
32
33 public static String  encode(byte [] data) {
34 return encode (data,0,data.length,null).toString();
35 }
36
37 public static StringBuffer encode(byte [] data, int start, int len, StringBuffer buf) {
38 if (buf == null)
39 buf = new StringBuffer (data.length * 3 / 2);
40
41 int end = len - 3;
42 int i = start;
43 int n = 0;
44
45 while (i <= end) {
46 int d = ((((int) data[i]) & 0x0ff) << 16)
47 | ((((int) data[i+1]) & 0x0ff) << 8)
48 | (((int) data[i+2]) & 0x0ff);
49 buf.append(charTab[(d >> 18) & 63]);
50 buf.append(charTab[(d >> 12) & 63]);
51 buf.append(charTab[(d >> 6) & 63]);
52 buf.append(charTab[d & 63]);
53 i += 3;
54 if (n++ >= 14) {
55 n = 0;
56 buf.append("\r\n");
57 }
58 }
59
60 if (i == start + len - 2) {
61 int d = ((((int) data[i]) & 0x0ff) << 16)
62 | ((((int) data[i+1]) & 255) << 8);
63 buf.append(charTab[(d >> 18) & 63]);
64 buf.append(charTab[(d >> 12) & 63]);
65 buf.append(charTab[(d >> 6) & 63]);
66 buf.append("=");
67 } else if (i == start + len - 1) {
68 int d = (((int) data[i]) & 0x0ff) << 16;
69 buf.append(charTab[(d >> 18) & 63]);
70 buf.append(charTab[(d >> 12) & 63]);
71 buf.append("==");
72 }
73 return buf;
74 }
75
76 static int decode(char c) {
77 if (c >= 'A' && c <= 'Z')
78 return ((int) c) - 65;
79 else if (c >= 'a' && c <= 'z')
80 return ((int) c) - 97 + 26;
81 else if (c >= '0' && c <= '9')
82 return ((int) c) - 48 + 26 + 26;
83 else
84 switch (c) {
85 case '+': return 62;
86 case '/': return 63;
87 case '=': return 0;
88 default:
89 throw new RuntimeException ("unexpected code: "+c);
90 }
91 }
92
93 public static byte [] decode(String s) {
94 ByteArrayOutputStream bos = new ByteArrayOutputStream();
95 decode(s,bos);
96 return bos.toByteArray();
97 }
98
99 public static void decode(String s, ByteArrayOutputStream bos) {
100 int i = 0;
101 int len = s.length();
102
103 while (true) {
104 while (i < len && s.charAt(i) <= ' ') i++;
105 if (i == len) break;
106 int tri = (decode(s.charAt(i)) << 18)
107 + (decode(s.charAt(i+1)) << 12)
108 + (decode(s.charAt(i+2)) << 6)
109 + (decode(s.charAt(i+3)));
110 bos.write((tri >> 16) & 255);
111 if (s.charAt (i+2) == '=') break;
112 bos.write((tri >> 8) & 255);
113 if (s.charAt (i+3) == '=') break;
114 bos.write(tri & 255);
115 i += 4;
116 }
117 }
118 }
119 |
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