Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib-mail/message-header-decode.c @ 956:26cafa3dc09c HEAD

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minor optimization
author Timo Sirainen <tss@iki.fi>
date Sun, 12 Jan 2003 01:49:45 +0200
parents 411006be3c66
children 60646878858e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
783
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1 /* Copyright (C) 2002 Timo Sirainen */
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2
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3 #include "lib.h"
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4 #include "base64.h"
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5 #include "buffer.h"
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6 #include "quoted-printable.h"
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7 #include "message-header-decode.h"
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8
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9 static int split_encoded(const unsigned char *data, size_t *size_p,
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10 const char **charset, const char **encoding,
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11 const unsigned char **text, size_t *text_size_r)
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12 {
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13 size_t size, pos, textpos;
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14
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15 size = *size_p;
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16
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17 /* get charset */
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18 for (pos = 0; pos < size && data[pos] != '?'; pos++) ;
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19 if (data[pos] != '?') return FALSE;
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20 *charset = t_strndup(data, pos);
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21
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22 /* get encoding */
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23 pos++;
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24 if (pos+2 >= size || data[pos+1] != '?')
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25 return FALSE;
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26
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27 if (data[pos] == 'Q' || data[pos] == 'q')
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28 *encoding = "Q";
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29 else if (data[pos] == 'B' || data[pos] == 'b')
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30 *encoding = "B";
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31 else
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32 return FALSE;
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33
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34 /* get text */
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35 pos += 2;
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36 textpos = pos;
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37 while (pos < size && data[pos] != '?') pos++;
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38 if (data[pos] != '?' || pos+1 >= size || data[pos+1] != '=')
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39 return FALSE;
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40
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41 *text = data + textpos;
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42 *text_size_r = pos - textpos;
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43 *size_p = pos+2;
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44 return TRUE;
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45 }
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46
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47 static int
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48 message_header_decode_encoded(const unsigned char *data, size_t *size,
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49 message_header_decode_callback_t callback,
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50 void *context)
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51 {
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52 const unsigned char *text;
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53 const char *charset, *encoding;
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54 buffer_t *decodebuf;
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55 size_t text_size;
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56 int ret;
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57
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58 t_push();
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59
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60 /* first split the string charset?encoding?text?= */
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61 if (!split_encoded(data, size, &charset, &encoding,
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62 &text, &text_size)) {
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63 t_pop();
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64 return TRUE;
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65 }
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66
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67 decodebuf = buffer_create_static_hard(data_stack_pool, text_size);
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68
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69 if (*encoding == 'Q')
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70 quoted_printable_decode(text, text_size, NULL, decodebuf);
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71 else {
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72 if (base64_decode(text, text_size, NULL, decodebuf) < 0) {
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73 /* corrupted encoding */
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74 t_pop();
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75 return TRUE;
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76 }
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77 }
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78
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79 ret = callback(buffer_get_data(decodebuf, NULL),
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80 buffer_get_used_size(decodebuf), charset, context);
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81
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82 t_pop();
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83 return ret;
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84 }
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85
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86 void message_header_decode(const unsigned char *data, size_t size,
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87 message_header_decode_callback_t callback,
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88 void *context)
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89 {
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90 size_t pos, start_pos, subsize;
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91
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92 start_pos = pos = 0;
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93 while (pos < size) {
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94 if (data[pos] == '=' && pos+1 < size && data[pos+1] == '?') {
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95 /* encoded string beginning */
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96 if (pos != start_pos) {
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97 /* send the unencoded data so far */
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98 if (!callback(data + start_pos, pos - start_pos,
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99 NULL, context))
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100 return;
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101 }
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102
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103 pos += 2;
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104 subsize = size - pos;
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105 if (!message_header_decode_encoded(data + pos, &subsize,
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106 callback, context))
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107 return;
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108
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109 pos += subsize;
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110 start_pos = pos;
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111 } else {
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112 pos++;
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113 }
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114 }
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115
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116 (void)callback(data + start_pos, size - start_pos, NULL, context);
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117 }