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22 <div class=
"contents">
23 <h1>base64.cc
</h1><div class=
"fragment"><pre class=
"fragment"><a name=
"l00001"></a>00001 <span class=
"comment">/*
</span>
24 <a name=
"l00002"></a>00002 <span class=
"comment"> * Encode or decode file as MIME base64 (RFC
1341)
</span>
25 <a name=
"l00003"></a>00003 <span class=
"comment"> * Public domain by John Walker, August
11 1997</span>
26 <a name=
"l00004"></a>00004 <span class=
"comment"> * http://www.fourmilab.ch/
</span>
27 <a name=
"l00005"></a>00005 <span class=
"comment"> * Modified slightly for the Citadel/UX system, June
1999</span>
28 <a name=
"l00006"></a>00006 <span class=
"comment"> *
</span>
29 <a name=
"l00007"></a>00007 <span class=
"comment"> * Taken from the Citadel/UX GPL source tree, at version
6.01</span>
30 <a name=
"l00008"></a>00008 <span class=
"comment"> * Modified into a C++ API by Chris Frey for Net Direct Inc., November
2005</span>
31 <a name=
"l00009"></a>00009 <span class=
"comment"> * http://www.netdirect.ca/
</span>
32 <a name=
"l00010"></a>00010 <span class=
"comment"> *
</span>
33 <a name=
"l00011"></a>00011 <span class=
"comment"> */
</span>
34 <a name=
"l00012"></a>00012
35 <a name=
"l00013"></a>00013 <span class=
"preprocessor">#include
"base64.h"</span>
36 <a name=
"l00014"></a>00014 <span class=
"preprocessor">#include
<string
></span>
37 <a name=
"l00015"></a>00015 <span class=
"preprocessor">#include
<iterator
></span>
38 <a name=
"l00016"></a>00016 <span class=
"preprocessor">#include
<stdio.h
></span>
39 <a name=
"l00017"></a>00017
40 <a name=
"l00018"></a>00018 <span class=
"preprocessor">#define TRUE
1</span>
41 <a name=
"l00019"></a>00019 <span class=
"preprocessor"></span><span class=
"preprocessor">#define FALSE
0</span>
42 <a name=
"l00020"></a>00020 <span class=
"preprocessor"></span>
43 <a name=
"l00021"></a>00021 <span class=
"preprocessor">#define LINELEN
72 </span><span class=
"comment">/* Encoded line length (max
76) */
</span>
44 <a name=
"l00022"></a>00022
45 <a name=
"l00023"></a>00023 <span class=
"keyword">typedef
</span> <span class=
"keywordtype">unsigned
</span> <span class=
"keywordtype">char
</span> byte;
<span class=
"comment">/* Byte type */
</span>
46 <a name=
"l00024"></a>00024
47 <a name=
"l00025"></a>00025 <span class=
"keyword">static
</span> byte dtable[
256];
<span class=
"comment">/* Encode / decode table */
</span>
48 <a name=
"l00026"></a>00026 <span class=
"comment">//static char eol[] =
"\r\n"; /* End of line sequence */
</span>
49 <a name=
"l00027"></a>00027 <span class=
"keyword">static
</span> <span class=
"keywordtype">int
</span> errcheck = TRUE;
<span class=
"comment">/* Check decode input for errors ? */
</span>
50 <a name=
"l00028"></a>00028
51 <a name=
"l00029"></a>00029
52 <a name=
"l00030"></a>00030 <span class=
"comment">/* INCHAR -- Return next character from input */
</span>
53 <a name=
"l00031"></a>00031
54 <a name=
"l00032"></a>00032 <span class=
"keyword">class
</span>base64_input
55 <a name=
"l00033"></a>00033 {
56 <a name=
"l00034"></a>00034 std::string::const_iterator begin, end;
57 <a name=
"l00035"></a>00035 <span class=
"keyword">public
</span>:
58 <a name=
"l00036"></a>00036 base64_input(
<span class=
"keyword">const
</span> std::string
&input)
59 <a name=
"l00037"></a>00037 : begin(input.begin()), end(input.end()) {}
60 <a name=
"l00038"></a>00038
61 <a name=
"l00039"></a>00039 <span class=
"keywordtype">int
</span> operator()()
62 <a name=
"l00040"></a>00040 {
63 <a name=
"l00041"></a>00041 <span class=
"keywordflow">if
</span> (begin == end) {
64 <a name=
"l00042"></a>00042 <span class=
"keywordflow">return
</span> EOF;
65 <a name=
"l00043"></a>00043 }
66 <a name=
"l00044"></a>00044 <span class=
"keywordflow">return
</span> (
<span class=
"keywordtype">int
</span>)((
<span class=
"keywordtype">unsigned
</span> int)(
<span class=
"keywordtype">unsigned
</span> <span class=
"keywordtype">char
</span>) *begin++);
67 <a name=
"l00045"></a>00045 }
68 <a name=
"l00046"></a>00046 };
69 <a name=
"l00047"></a>00047
70 <a name=
"l00048"></a>00048
71 <a name=
"l00049"></a>00049 <span class=
"comment">/* OCHAR -- Output an encoded character, inserting line breaks
</span>
72 <a name=
"l00050"></a>00050 <span class=
"comment"> where required. */
</span>
73 <a name=
"l00051"></a>00051
74 <a name=
"l00052"></a>00052 <span class=
"keyword">class
</span>base64_output
75 <a name=
"l00053"></a>00053 {
76 <a name=
"l00054"></a>00054 std::back_insert_iterator
<std::string
> insert;
77 <a name=
"l00055"></a>00055 <span class=
"keywordtype">int
</span> linelength;
<span class=
"comment">/* Length of encoded output line */
</span>
78 <a name=
"l00056"></a>00056
79 <a name=
"l00057"></a>00057 <span class=
"keyword">public
</span>:
80 <a name=
"l00058"></a>00058 base64_output(std::string
&output)
81 <a name=
"l00059"></a>00059 : insert(back_inserter(output)),
82 <a name=
"l00060"></a>00060 linelength(
0)
83 <a name=
"l00061"></a>00061 {}
84 <a name=
"l00062"></a>00062
85 <a name=
"l00063"></a>00063 <span class=
"keywordtype">void
</span> operator()(
<span class=
"keywordtype">int
</span> c)
86 <a name=
"l00064"></a>00064 {
87 <a name=
"l00065"></a>00065 <span class=
"keywordflow">if
</span> (linelength
>= LINELEN) {
88 <a name=
"l00066"></a>00066 *insert++ =
<span class=
"charliteral">'\n'
</span>;
89 <a name=
"l00067"></a>00067 *insert++ =
<span class=
"charliteral">' '
</span>;
90 <a name=
"l00068"></a>00068 linelength =
0;
91 <a name=
"l00069"></a>00069 }
92 <a name=
"l00070"></a>00070 *insert++ = (
<span class=
"keywordtype">unsigned
</span> char) c;
93 <a name=
"l00071"></a>00071 linelength++;
94 <a name=
"l00072"></a>00072 }
95 <a name=
"l00073"></a>00073 };
96 <a name=
"l00074"></a>00074
97 <a name=
"l00075"></a>00075 <span class=
"comment">/* ENCODE -- Encode binary file into base64. */
</span>
98 <a name=
"l00076"></a>00076
99 <a name=
"l00077"></a>00077 <span class=
"keyword">static
</span> <span class=
"keywordtype">bool
</span> encode(base64_input
&inchar, base64_output
&ochar)
100 <a name=
"l00078"></a>00078 {
101 <a name=
"l00079"></a>00079 <span class=
"keywordtype">int
</span> i, hiteof = FALSE;
102 <a name=
"l00080"></a>00080
103 <a name=
"l00081"></a>00081 <span class=
"comment">/* Fill dtable with character encodings. */
</span>
104 <a name=
"l00082"></a>00082
105 <a name=
"l00083"></a>00083 <span class=
"keywordflow">for
</span> (i =
0; i
< 26; i++) {
106 <a name=
"l00084"></a>00084 dtable[i] =
<span class=
"charliteral">'A'
</span> + i;
107 <a name=
"l00085"></a>00085 dtable[
26 + i] =
<span class=
"charliteral">'a'
</span> + i;
108 <a name=
"l00086"></a>00086 }
109 <a name=
"l00087"></a>00087 <span class=
"keywordflow">for
</span> (i =
0; i
< 10; i++) {
110 <a name=
"l00088"></a>00088 dtable[
52 + i] =
<span class=
"charliteral">'
0'
</span> + i;
111 <a name=
"l00089"></a>00089 }
112 <a name=
"l00090"></a>00090 dtable[
62] =
<span class=
"charliteral">'+'
</span>;
113 <a name=
"l00091"></a>00091 dtable[
63] =
<span class=
"charliteral">'/'
</span>;
114 <a name=
"l00092"></a>00092
115 <a name=
"l00093"></a>00093 <span class=
"keywordflow">while
</span> (!hiteof) {
116 <a name=
"l00094"></a>00094 byte igroup[
3], ogroup[
4];
117 <a name=
"l00095"></a>00095 <span class=
"keywordtype">int
</span> c, n;
118 <a name=
"l00096"></a>00096
119 <a name=
"l00097"></a>00097 igroup[
0] = igroup[
1] = igroup[
2] =
0;
120 <a name=
"l00098"></a>00098 <span class=
"keywordflow">for
</span> (n =
0; n
< 3; n++) {
121 <a name=
"l00099"></a>00099 c = inchar();
122 <a name=
"l00100"></a>00100 <span class=
"keywordflow">if
</span> (c == EOF) {
123 <a name=
"l00101"></a>00101 hiteof = TRUE;
124 <a name=
"l00102"></a>00102 <span class=
"keywordflow">break
</span>;
125 <a name=
"l00103"></a>00103 }
126 <a name=
"l00104"></a>00104 igroup[n] = (byte) c;
127 <a name=
"l00105"></a>00105 }
128 <a name=
"l00106"></a>00106 <span class=
"keywordflow">if
</span> (n
> 0) {
129 <a name=
"l00107"></a>00107 ogroup[
0] = dtable[igroup[
0]
>> 2];
130 <a name=
"l00108"></a>00108 ogroup[
1] = dtable[((igroup[
0]
& 3)
<< 4) | (igroup[
1]
>> 4)];
131 <a name=
"l00109"></a>00109 ogroup[
2] = dtable[((igroup[
1]
& 0xF)
<< 2) | (igroup[
2]
>> 6)];
132 <a name=
"l00110"></a>00110 ogroup[
3] = dtable[igroup[
2]
& 0x3F];
133 <a name=
"l00111"></a>00111
134 <a name=
"l00112"></a>00112 <span class=
"comment">/* Replace characters in output stream with
"=" pad
</span>
135 <a name=
"l00113"></a>00113 <span class=
"comment"> characters if fewer than three characters were
</span>
136 <a name=
"l00114"></a>00114 <span class=
"comment"> read from the end of the input stream. */
</span>
137 <a name=
"l00115"></a>00115
138 <a name=
"l00116"></a>00116 <span class=
"keywordflow">if
</span> (n
< 3) {
139 <a name=
"l00117"></a>00117 ogroup[
3] =
<span class=
"charliteral">'='
</span>;
140 <a name=
"l00118"></a>00118 <span class=
"keywordflow">if
</span> (n
< 2) {
141 <a name=
"l00119"></a>00119 ogroup[
2] =
<span class=
"charliteral">'='
</span>;
142 <a name=
"l00120"></a>00120 }
143 <a name=
"l00121"></a>00121 }
144 <a name=
"l00122"></a>00122 <span class=
"keywordflow">for
</span> (i =
0; i
< 4; i++) {
145 <a name=
"l00123"></a>00123 ochar(ogroup[i]);
146 <a name=
"l00124"></a>00124 }
147 <a name=
"l00125"></a>00125 }
148 <a name=
"l00126"></a>00126 }
149 <a name=
"l00127"></a>00127 <span class=
"keywordflow">return
</span> <span class=
"keyword">true
</span>;
150 <a name=
"l00128"></a>00128 }
151 <a name=
"l00129"></a>00129
152 <a name=
"l00130"></a>00130 <span class=
"comment">/* INSIG -- Return next significant input */
</span>
153 <a name=
"l00131"></a>00131
154 <a name=
"l00132"></a>00132 <span class=
"keyword">static
</span> <span class=
"keywordtype">int
</span> insig(base64_input
&inchar)
155 <a name=
"l00133"></a>00133 {
156 <a name=
"l00134"></a>00134 <span class=
"keywordtype">int
</span> c;
157 <a name=
"l00135"></a>00135
158 <a name=
"l00136"></a>00136 <span class=
"comment">/*CONSTANTCONDITION*/
</span>
159 <a name=
"l00137"></a>00137 <span class=
"keywordflow">while
</span> (TRUE) {
160 <a name=
"l00138"></a>00138 c = inchar();
161 <a name=
"l00139"></a>00139 <span class=
"keywordflow">if
</span> (c == EOF || (c
> <span class=
"charliteral">' '
</span>)) {
162 <a name=
"l00140"></a>00140 <span class=
"keywordflow">return
</span> c;
163 <a name=
"l00141"></a>00141 }
164 <a name=
"l00142"></a>00142 }
165 <a name=
"l00143"></a>00143 <span class=
"comment">/*NOTREACHED*/
</span>
166 <a name=
"l00144"></a>00144 }
167 <a name=
"l00145"></a>00145
168 <a name=
"l00146"></a>00146 <span class=
"comment">/* DECODE -- Decode base64. */
</span>
169 <a name=
"l00147"></a>00147
170 <a name=
"l00148"></a>00148 <span class=
"keyword">static
</span> <span class=
"keywordtype">bool
</span> decode(base64_input
&inchar, base64_output
&ochar)
171 <a name=
"l00149"></a>00149 {
172 <a name=
"l00150"></a>00150 <span class=
"keywordtype">int
</span> i;
173 <a name=
"l00151"></a>00151
174 <a name=
"l00152"></a>00152 <span class=
"keywordflow">for
</span> (i =
0; i
< 255; i++) {
175 <a name=
"l00153"></a>00153 dtable[i] =
0x80;
176 <a name=
"l00154"></a>00154 }
177 <a name=
"l00155"></a>00155 <span class=
"keywordflow">for
</span> (i =
<span class=
"charliteral">'A'
</span>; i
<=
<span class=
"charliteral">'Z'
</span>; i++) {
178 <a name=
"l00156"></a>00156 dtable[i] =
0 + (i -
<span class=
"charliteral">'A'
</span>);
179 <a name=
"l00157"></a>00157 }
180 <a name=
"l00158"></a>00158 <span class=
"keywordflow">for
</span> (i =
<span class=
"charliteral">'a'
</span>; i
<=
<span class=
"charliteral">'z'
</span>; i++) {
181 <a name=
"l00159"></a>00159 dtable[i] =
26 + (i -
<span class=
"charliteral">'a'
</span>);
182 <a name=
"l00160"></a>00160 }
183 <a name=
"l00161"></a>00161 <span class=
"keywordflow">for
</span> (i =
<span class=
"charliteral">'
0'
</span>; i
<=
<span class=
"charliteral">'
9'
</span>; i++) {
184 <a name=
"l00162"></a>00162 dtable[i] =
52 + (i -
<span class=
"charliteral">'
0'
</span>);
185 <a name=
"l00163"></a>00163 }
186 <a name=
"l00164"></a>00164 dtable[(int)
<span class=
"charliteral">'+'
</span>] =
62;
187 <a name=
"l00165"></a>00165 dtable[(int)
<span class=
"charliteral">'/'
</span>] =
63;
188 <a name=
"l00166"></a>00166 dtable[(int)
<span class=
"charliteral">'='
</span>] =
0;
189 <a name=
"l00167"></a>00167
190 <a name=
"l00168"></a>00168 <span class=
"comment">/*CONSTANTCONDITION*/
</span>
191 <a name=
"l00169"></a>00169 <span class=
"keywordflow">while
</span> (TRUE) {
192 <a name=
"l00170"></a>00170 byte a[
4], b[
4], o[
3];
193 <a name=
"l00171"></a>00171
194 <a name=
"l00172"></a>00172 <span class=
"keywordflow">for
</span> (i =
0; i
< 4; i++) {
195 <a name=
"l00173"></a>00173 <span class=
"keywordtype">int
</span> c = insig(inchar);
196 <a name=
"l00174"></a>00174
197 <a name=
"l00175"></a>00175 <span class=
"keywordflow">if
</span> (c == EOF) {
198 <a name=
"l00176"></a>00176 <span class=
"comment">// fprintf(stderr,
"Input file incomplete.\n");
</span>
199 <a name=
"l00177"></a>00177 <span class=
"keywordflow">return
</span> <span class=
"keyword">false
</span>;
200 <a name=
"l00178"></a>00178 }
201 <a name=
"l00179"></a>00179 <span class=
"keywordflow">if
</span> (dtable[c]
& 0x80) {
202 <a name=
"l00180"></a>00180 <span class=
"keywordflow">if
</span> (errcheck) {
203 <a name=
"l00181"></a>00181 <span class=
"comment">//fprintf(stderr,
"Illegal character '%c' in input file.\n", c);
</span>
204 <a name=
"l00182"></a>00182 <span class=
"keywordflow">return
</span> <span class=
"keyword">false
</span>;
205 <a name=
"l00183"></a>00183 }
206 <a name=
"l00184"></a>00184 <span class=
"comment">/* Ignoring errors: discard invalid character. */
</span>
207 <a name=
"l00185"></a>00185 i--;
208 <a name=
"l00186"></a>00186 <span class=
"keywordflow">continue
</span>;
209 <a name=
"l00187"></a>00187 }
210 <a name=
"l00188"></a>00188 a[i] = (byte) c;
211 <a name=
"l00189"></a>00189 b[i] = (byte) dtable[c];
212 <a name=
"l00190"></a>00190 }
213 <a name=
"l00191"></a>00191 o[
0] = (b[
0]
<< 2) | (b[
1]
>> 4);
214 <a name=
"l00192"></a>00192 o[
1] = (b[
1]
<< 4) | (b[
2]
>> 2);
215 <a name=
"l00193"></a>00193 o[
2] = (b[
2]
<< 6) | b[
3];
216 <a name=
"l00194"></a>00194 i = a[
2] ==
<span class=
"charliteral">'='
</span> ?
1 : (a[
3] ==
<span class=
"charliteral">'='
</span> ?
2 :
3);
217 <a name=
"l00195"></a>00195 <span class=
"keywordflow">for
</span> (
<span class=
"keywordtype">int
</span> w =
0; w
< i; w++ )
218 <a name=
"l00196"></a>00196 ochar(o[w]);
219 <a name=
"l00197"></a>00197 <span class=
"keywordflow">if
</span> (i
< 3) {
220 <a name=
"l00198"></a>00198 <span class=
"keywordflow">return
</span> <span class=
"keyword">true
</span>;
221 <a name=
"l00199"></a>00199 }
222 <a name=
"l00200"></a>00200 }
223 <a name=
"l00201"></a>00201 }
224 <a name=
"l00202"></a>00202
225 <a name=
"l00203"></a>00203 <span class=
"comment">// in-memory encode / decode API
</span>
226 <a name=
"l00204"></a>00204 <span class=
"keywordtype">bool
</span> base64_encode(
<span class=
"keyword">const
</span> std::string
&in, std::string
&out)
227 <a name=
"l00205"></a>00205 {
228 <a name=
"l00206"></a>00206 out.clear();
229 <a name=
"l00207"></a>00207 base64_input input(in);
230 <a name=
"l00208"></a>00208 base64_output output(out);
231 <a name=
"l00209"></a>00209 <span class=
"keywordflow">return
</span> encode(input, output);
232 <a name=
"l00210"></a>00210 }
233 <a name=
"l00211"></a>00211
234 <a name=
"l00212"></a>00212 <span class=
"keywordtype">bool
</span> base64_decode(
<span class=
"keyword">const
</span> std::string
&in, std::string
&out)
235 <a name=
"l00213"></a>00213 {
236 <a name=
"l00214"></a>00214 out.clear();
237 <a name=
"l00215"></a>00215 base64_input input(in);
238 <a name=
"l00216"></a>00216 base64_output output(out);
239 <a name=
"l00217"></a>00217 <span class=
"keywordflow">return
</span> decode(input, output);
240 <a name=
"l00218"></a>00218 }
241 <a name=
"l00219"></a>00219
242 <a name=
"l00220"></a>00220
243 <a name=
"l00221"></a>00221 <span class=
"preprocessor">#ifdef __TEST_MODE__
</span>
244 <a name=
"l00222"></a>00222 <span class=
"preprocessor"></span>
245 <a name=
"l00223"></a>00223 <span class=
"preprocessor">#include
<iostream
></span>
246 <a name=
"l00224"></a>00224 <span class=
"keyword">using namespace
</span>std;
247 <a name=
"l00225"></a>00225
248 <a name=
"l00226"></a>00226 <span class=
"comment">/* Main program */
</span>
249 <a name=
"l00227"></a>00227
250 <a name=
"l00228"></a>00228 <span class=
"keywordtype">int
</span> main()
251 <a name=
"l00229"></a>00229 {
252 <a name=
"l00230"></a>00230 <span class=
"keywordtype">string
</span> test =
<span class=
"stringliteral">"This is a test."</span>, encoded, decoded;
253 <a name=
"l00231"></a>00231 base64_encode(test, encoded);
254 <a name=
"l00232"></a>00232 base64_decode(encoded, decoded);
255 <a name=
"l00233"></a>00233 <span class=
"keywordflow">if
</span>( test != decoded )
256 <a name=
"l00234"></a>00234 cerr
<< <span class=
"stringliteral">"Test failed"</span> << endl;
257 <a name=
"l00235"></a>00235 <span class=
"keywordflow">else
</span>
258 <a name=
"l00236"></a>00236 cerr
<< <span class=
"stringliteral">"Success"</span> << endl;
259 <a name=
"l00237"></a>00237 }
260 <a name=
"l00238"></a>00238
261 <a name=
"l00239"></a>00239 <span class=
"preprocessor">#endif
</span>
262 <a name=
"l00240"></a>00240 <span class=
"preprocessor"></span>
264 <hr size=
"1"><address style=
"text-align: right;"><small>Generated on Thu Feb
10 16:
13:
57 2011 for Barry by
265 <a href=
"http://www.doxygen.org/index.html">
266 <img src=
"doxygen.png" alt=
"doxygen" align=
"middle" border=
"0"></a> 1.5.6 </small></address>