FreeCalypso > hg > falcon-mail-tools

annotate f-demime/b2q_out.c @ 2:1857d0d5a7bd

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f-demime: fix parsing of Content-* headers
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 06 May 2023 06:33:26 +0000
parents 7e0d08176f32
children
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Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This module implements the output side of base64-to-QP conversion.
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3 */
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4
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5 #include <stdio.h>
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6 #include <stdlib.h>
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7 #include <string.h>
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8 #include <strings.h>
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9 #include "defs.h"
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10
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11 extern FILE *tempfile;
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12
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13 static char linebuf[QP_MAX_LINE];
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14 static unsigned line_len, trailing_newline;
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15
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16 static void
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17 add_plain_char(ch)
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18 {
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19 linebuf[line_len++] = ch;
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20 linebuf[line_len] = '\0';
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21 if (!strcmp(linebuf, "From ")) {
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22 strcpy(linebuf, "=46rom ");
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23 line_len = 7;
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24 } else if (!strcmp(linebuf, "--")) {
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25 strcpy(linebuf, "=2D-");
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26 line_len = 4;
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27 } else if (!strcmp(linebuf, ".")) {
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28 strcpy(linebuf, "=2E");
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29 line_len = 3;
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30 }
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31 }
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32
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33 static void
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34 add_octet_char(ch)
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35 {
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36 sprintf(linebuf + line_len, "=%02X", ch);
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37 line_len += 3;
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38 }
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39
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40 static void
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41 process_newline()
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42 {
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43 if (line_len) {
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44 if (linebuf[line_len-1] == ' ')
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45 strcpy(linebuf + line_len - 1, "=20");
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46 fputs(linebuf, stdout);
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47 line_len = 0;
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48 }
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49 putchar('\n');
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50 }
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51
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52 static void
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53 process_char(ch)
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54 {
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55 if (ch == '\n') {
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56 process_newline();
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57 trailing_newline++;
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58 if (trailing_newline > 2)
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59 trailing_newline = 2;
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60 return;
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61 }
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62 if (line_len >= QP_MAX_LINE - 2) {
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63 printf("%s=\n", linebuf);
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64 line_len = 0;
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65 }
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66 if (ch == '=')
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67 add_octet_char(ch);
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68 else if (ch >= ' ' && ch <= '~')
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69 add_plain_char(ch);
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70 else
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71 add_octet_char(ch);
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72 trailing_newline = 0;
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73 }
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74
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75 void
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76 b2q_emit_output()
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77 {
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78 int c;
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79
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80 rewind(tempfile);
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81 line_len = 0;
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82 trailing_newline = 1;
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83 while ((c = getc(tempfile)) != EOF)
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84 process_char(c);
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85 fclose(tempfile);
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86 while (trailing_newline < 2) {
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87 process_newline();
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88 trailing_newline++;
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89 }
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90 }