author | zautrix <zautrix> | 2004-07-03 16:33:12 (UTC) |
---|---|---|
committer | zautrix <zautrix> | 2004-07-03 16:33:12 (UTC) |
commit | e3b89230f065c48c84b48c88edb6eb088374c487 (patch) (unidiff) | |
tree | 162ea2ef909a6f82ccfcedf45d80d6c821174912 /kmicromail/libetpan/tools/base64.c | |
parent | 2dd6ac0b2d24c91d35ce674a6c26351352df2b15 (diff) | |
download | kdepimpi-e3b89230f065c48c84b48c88edb6eb088374c487.zip kdepimpi-e3b89230f065c48c84b48c88edb6eb088374c487.tar.gz kdepimpi-e3b89230f065c48c84b48c88edb6eb088374c487.tar.bz2 |
Initial revision
Diffstat (limited to 'kmicromail/libetpan/tools/base64.c') (more/less context) (ignore whitespace changes)
-rw-r--r-- | kmicromail/libetpan/tools/base64.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/kmicromail/libetpan/tools/base64.c b/kmicromail/libetpan/tools/base64.c new file mode 100644 index 0000000..1532bac --- a/dev/null +++ b/kmicromail/libetpan/tools/base64.c | |||
@@ -0,0 +1,143 @@ | |||
1 | /* | ||
2 | * libEtPan! -- a mail stuff library | ||
3 | * | ||
4 | * Copyright (C) 2001, 2002 - Juergen Graf | ||
5 | * All rights reserved. | ||
6 | * | ||
7 | * Redistribution and use in source and binary forms, with or without | ||
8 | * modification, are permitted provided that the following conditions | ||
9 | * are met: | ||
10 | * 1. Redistributions of source code must retain the above copyright | ||
11 | * notice, this list of conditions and the following disclaimer. | ||
12 | * 2. Redistributions in binary form must reproduce the above copyright | ||
13 | * notice, this list of conditions and the following disclaimer in the | ||
14 | * documentation and/or other materials provided with the distribution. | ||
15 | * 3. Neither the name of the libEtPan! project nor the names of its | ||
16 | * contributors may be used to endorse or promote products derived | ||
17 | * from this software without specific prior written permission. | ||
18 | * | ||
19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | ||
20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | ||
23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | ||
25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||
26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||
29 | * SUCH DAMAGE. | ||
30 | */ | ||
31 | |||
32 | /* | ||
33 | * $Id$ | ||
34 | */ | ||
35 | |||
36 | #include "base64.h" | ||
37 | |||
38 | #include <stdlib.h> | ||
39 | |||
40 | #define OUTPUT_SIZE 513 | ||
41 | #define CHAR64(c) (((c) < 0 || (c) > 127) ? -1 : index_64[(c)]) | ||
42 | |||
43 | static char index_64[128] = { | ||
44 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, | ||
45 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, | ||
46 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63, | ||
47 | 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1, | ||
48 | -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, | ||
49 | 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1, | ||
50 | -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, | ||
51 | 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1 | ||
52 | }; | ||
53 | |||
54 | static char basis_64[] = | ||
55 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; | ||
56 | |||
57 | char * encode_base64(const char * in, int len) | ||
58 | { | ||
59 | char * output, * tmp; | ||
60 | unsigned char oval; | ||
61 | int out_len; | ||
62 | |||
63 | out_len = ((len + 2) / 3 * 4) + 1; | ||
64 | |||
65 | if ((len > 0) && (in == NULL)) | ||
66 | return NULL; | ||
67 | |||
68 | output = malloc(out_len); | ||
69 | if (!output) | ||
70 | return NULL; | ||
71 | |||
72 | tmp = output; | ||
73 | while (len >= 3) { | ||
74 | *tmp++ = basis_64[in[0] >> 2]; | ||
75 | *tmp++ = basis_64[((in[0] << 4) & 0x30) | (in[1] >> 4)]; | ||
76 | *tmp++ = basis_64[((in[1] << 2) & 0x3c) | (in[2] >> 6)]; | ||
77 | *tmp++ = basis_64[in[2] & 0x3f]; | ||
78 | in += 3; | ||
79 | len -= 3; | ||
80 | } | ||
81 | if (len > 0) { | ||
82 | *tmp++ = basis_64[in[0] >> 2]; | ||
83 | oval = (in[0] << 4) & 0x30; | ||
84 | if (len > 1) oval |= in[1] >> 4; | ||
85 | *tmp++ = basis_64[oval]; | ||
86 | *tmp++ = (len < 2) ? '=' : basis_64[(in[1] << 2) & 0x3c]; | ||
87 | *tmp++ = '='; | ||
88 | } | ||
89 | |||
90 | *tmp = '\0'; | ||
91 | |||
92 | return output; | ||
93 | } | ||
94 | |||
95 | char * decode_base64(const char * in, int len) | ||
96 | { | ||
97 | char * output, * out; | ||
98 | int i, c1, c2, c3, c4, out_len; | ||
99 | |||
100 | out_len = 0; | ||
101 | |||
102 | output = malloc(OUTPUT_SIZE); | ||
103 | if (output == NULL) | ||
104 | return NULL; | ||
105 | out = output; | ||
106 | |||
107 | if (in[0] == '+' && in[1] == ' ') | ||
108 | in += 2; | ||
109 | |||
110 | for (i = 0; i < (len / 4); i++) { | ||
111 | c1 = in[0]; | ||
112 | c2 = in[1]; | ||
113 | c3 = in[2]; | ||
114 | c4 = in[3]; | ||
115 | if (CHAR64(c1) == -1 || CHAR64(c2) == -1 || | ||
116 | (c3 != '=' && CHAR64(c3) == -1) || | ||
117 | (c4 != '=' && CHAR64(c4) == -1)) | ||
118 | return NULL; | ||
119 | |||
120 | in += 4; | ||
121 | *output++ = (CHAR64(c1) << 2) | (CHAR64(c2) >> 4); | ||
122 | if (++out_len >= OUTPUT_SIZE) | ||
123 | return NULL; | ||
124 | |||
125 | if (c3 != '=') { | ||
126 | *output++ = ((CHAR64(c2) << 4) & 0xf0) | (CHAR64(c3) >> 2); | ||
127 | if (++out_len >= OUTPUT_SIZE) | ||
128 | return NULL; | ||
129 | |||
130 | if (c4 != '=') { | ||
131 | *output++ = ((CHAR64(c3) << 6) & 0xc0) | CHAR64(c4); | ||
132 | if (++out_len >= OUTPUT_SIZE) | ||
133 | return NULL; | ||
134 | } | ||
135 | } | ||
136 | } | ||
137 | |||
138 | *output = 0; | ||
139 | |||
140 | return out; | ||
141 | } | ||
142 | |||
143 | |||