Commit | Line | Data |
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f8beb284 MW |
1 | #include "stralloc.h" |
2 | #include "strerr.h" | |
3 | #include "uint32.h" | |
4 | #include "errtxt.h" | |
5 | ||
6 | /* Characters and translation as per rfc2047. */ | |
7 | static char char64table[128] = { | |
8 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, | |
9 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, | |
10 | -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63, | |
11 | 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1,-1,-1,-1, | |
12 | -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, | |
13 | 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1, | |
14 | -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, | |
15 | 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1 | |
16 | }; | |
17 | ||
18 | #define char64enc(c) (((c) & 0x80) ? -1 : char64table[(c)]) | |
19 | ||
20 | static void die_nomem(fatal) | |
21 | char *fatal; | |
22 | { | |
23 | strerr_die2x(111,fatal,ERR_NOMEM); | |
24 | } | |
25 | ||
26 | void decodeB(cpfrom,n,outdata,fatal) | |
27 | char *cpfrom; | |
28 | unsigned int n; | |
29 | stralloc *outdata; | |
30 | char *fatal; | |
31 | /* does B decoding of the string pointed to by cpfrom up to the character */ | |
32 | /* before the one pointed to by cpnext, and appends the results to mimeline*/ | |
33 | { | |
34 | uint32 hold32; | |
35 | char holdch[4] = "???"; | |
36 | int i,j; | |
37 | char c; /* needs to be signed */ | |
38 | char *cp, *cpnext; | |
39 | ||
40 | cp = cpfrom; | |
41 | cpnext = cp + n; | |
42 | i = 0; | |
43 | hold32 = 0L; | |
44 | if (!stralloc_readyplus(outdata,n)) die_nomem(fatal); | |
45 | for (;;) { | |
46 | if (i == 4) { | |
47 | for (j = 2; j >= 0; --j) { | |
48 | holdch[j] = hold32 & 0xff; | |
49 | hold32 = hold32 >> 8; | |
50 | } | |
51 | if (!stralloc_cats(outdata,holdch)) die_nomem(fatal); | |
52 | if (cp >= cpnext) | |
53 | break; | |
54 | hold32 = 0L; | |
55 | i = 0; | |
56 | } | |
57 | if (cp >= cpnext) { /* pad */ | |
58 | c = 0; | |
59 | } else { | |
60 | c = char64enc(*cp); | |
61 | ++cp; | |
62 | } | |
63 | if (c < 0) /* ignore illegal characters */ | |
64 | continue; | |
65 | else { | |
66 | hold32 = (hold32 << 6) | (c & 0x7f); | |
67 | ++i; | |
68 | } | |
69 | } | |
70 | } | |
71 |