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comparison f-demime/msgstate.c @ 0:7e0d08176f32

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f-demime starting code
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 06 May 2023 06:14:03 +0000
parents
children 612c4d0df768
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-1:000000000000 0:7e0d08176f32
1 /*
2 * This module implements the message state machine, receiving input lines
3 * and message start/end markers from the input processing main loop.
4 */
5
6 #include <ctype.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <strings.h>
11 #include "defs.h"
12
13 enum msg_state msg_state;
14 enum msg_hdr_state hdr_state;
15 unsigned mp_nest_level;
16 char mp_boundaries[MAX_MP_NESTING][MAX_MP_BOUNDARY+1];
17 int mp_is_digest[MAX_MP_NESTING];
18 char cont_type_buf[HDR_BUF_SIZE], cont_te_buf[HDR_BUF_SIZE];
19 int got_cont_type, got_cont_te;
20
21 void
22 start_entity_hdr()
23 {
24 msg_state = MSG_STATE_HEADER;
25 hdr_state = HDR_STATE_BEGIN;
26 got_cont_type = 0;
27 got_cont_te = 0;
28 }
29
30 void
31 begin_new_message()
32 {
33 mp_nest_level = 0;
34 start_entity_hdr();
35 }
36
37 static void
38 emit_prefrom_warning()
39 {
40 static int done;
41
42 if (done)
43 return;
44 fprintf(stderr,
45 "f-demime warning: data present before the first From\n");
46 done = 1;
47 }
48
49 static int
50 check_mp_terminator(line)
51 char *line;
52 {
53 unsigned lev, bndlen;
54 char *bnd, *cp;
55
56 if (line[0] != '-' || line[1] != '-')
57 return(0);
58 for (lev = 0; lev < mp_nest_level; lev++) {
59 bnd = mp_boundaries[lev];
60 bndlen = strlen(bnd);
61 if (strncmp(line+2, bnd, bndlen))
62 continue;
63 finish_msg_body();
64 puts(line);
65 cp = line + 2 + bndlen;
66 if (!*cp || isspace(*cp)) {
67 mp_nest_level = lev + 1;
68 start_entity_hdr();
69 return(1);
70 }
71 if (cp[0] != '-' || cp[1] != '-')
72 puts("X-Fdemime-Error: invalid delimiter line");
73 mp_nest_level = lev;
74 msg_state = MSG_STATE_BODY_PASS;
75 return(1);
76 }
77 return(0);
78 }
79
80 void
81 message_input_line(line)
82 char *line;
83 {
84 if (check_mp_terminator(line))
85 return;
86 switch (msg_state) {
87 case MSG_STATE_UNDEF:
88 emit_prefrom_warning();
89 puts(line);
90 return;
91 case MSG_STATE_HEADER:
92 header_input_line(line);
93 return;
94 case MSG_STATE_BODY_PASS:
95 puts(line);
96 return;
97 case MSG_STATE_PTEXT_B64:
98 case MSG_STATE_BLOB_B64:
99 case MSG_STATE_B64_TO_QP:
100 base64_input_line(line);
101 return;
102 case MSG_STATE_PTEXT_QP:
103 qpdec_input_line(line);
104 return;
105 default:
106 fprintf(stderr,
107 "f-demime internal error: bad state in message_input_line()\n");
108 abort();
109 }
110 }