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annotate f-demime/msgstate.c @ 4:612c4d0df768

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f-demime: rework for unboundedly long lines
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 06 May 2023 09:02:12 +0000
parents 7e0d08176f32
children
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7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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2 * This module implements the message state machine, receiving input lines
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3 * and message start/end markers from the input processing main loop.
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4 */
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5
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6 #include <ctype.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include "defs.h"
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12
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13 enum msg_state msg_state;
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14 enum msg_hdr_state hdr_state;
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15 unsigned mp_nest_level;
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16 char mp_boundaries[MAX_MP_NESTING][MAX_MP_BOUNDARY+1];
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17 int mp_is_digest[MAX_MP_NESTING];
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18 char cont_type_buf[HDR_BUF_SIZE], cont_te_buf[HDR_BUF_SIZE];
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19 int got_cont_type, got_cont_te;
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20
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21 void
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22 start_entity_hdr()
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23 {
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24 msg_state = MSG_STATE_HEADER;
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25 hdr_state = HDR_STATE_BEGIN;
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26 got_cont_type = 0;
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27 got_cont_te = 0;
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28 }
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29
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30 void
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31 begin_new_message()
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32 {
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33 mp_nest_level = 0;
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34 start_entity_hdr();
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35 }
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36
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37 static void
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38 emit_prefrom_warning()
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39 {
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40 static int done;
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41
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42 if (done)
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43 return;
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44 fprintf(stderr,
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45 "f-demime warning: data present before the first From\n");
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46 done = 1;
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47 }
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48
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49 static int
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50 check_mp_terminator(line, unterm)
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51 char *line;
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52 {
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53 unsigned lev, bndlen;
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54 char *bnd, *cp;
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55
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56 if (line[0] != '-' || line[1] != '-')
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57 return(0);
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58 for (lev = 0; lev < mp_nest_level; lev++) {
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59 bnd = mp_boundaries[lev];
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60 bndlen = strlen(bnd);
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61 if (strncmp(line+2, bnd, bndlen))
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62 continue;
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63 finish_msg_body();
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64 fputs(line, stdout);
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65 cp = line + 2 + bndlen;
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66 if (!*cp || isspace(*cp)) {
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67 mp_nest_level = lev + 1;
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68 start_entity_hdr();
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69 if (unterm)
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70 msg_state = MSG_STATE_DELIM_UNTERM;
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71 return(1);
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72 }
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73 if (cp[0] != '-' || cp[1] != '-') {
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74 if (!unterm)
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75 puts("X-Fdemime-Error: invalid delimiter line");
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76 }
0
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77 mp_nest_level = lev;
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78 msg_state = MSG_STATE_BODY_PASS;
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79 return(1);
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80 }
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81 return(0);
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82 }
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83
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84 void
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85 message_input_line(line, unterm, prev_unterm)
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86 char *line;
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87 {
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88 if (!prev_unterm && check_mp_terminator(line, unterm))
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89 return;
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90 switch (msg_state) {
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91 case MSG_STATE_UNDEF:
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92 emit_prefrom_warning();
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93 fputs(line, stdout);
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94 return;
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95 case MSG_STATE_DELIM_UNTERM:
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96 fputs(line, stdout);
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97 if (!unterm)
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98 msg_state = MSG_STATE_HEADER;
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99 return;
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100 case MSG_STATE_HEADER:
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101 header_input_line(line, unterm, prev_unterm);
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102 return;
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103 case MSG_STATE_BODY_PASS:
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104 fputs(line, stdout);
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105 return;
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106 case MSG_STATE_PTEXT_B64:
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107 case MSG_STATE_BLOB_B64:
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108 case MSG_STATE_B64_TO_QP:
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109 base64_input_line(line);
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110 return;
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111 case MSG_STATE_PTEXT_QP:
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112 qpdec_input_line(line, unterm);
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113 return;
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114 default:
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115 fprintf(stderr,
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116 "f-demime internal error: bad state in message_input_line()\n");
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117 abort();
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118 }
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119 }