Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib-imap/imap-quote.c @ 339:6f4eeb6a0a0d HEAD

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Several fields in BODY were unquoted.
author Timo Sirainen <tss@iki.fi>
date Tue, 01 Oct 2002 00:18:12 +0300
parents
children e524da896d92
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
339
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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 "temp-string.h"
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5
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6 #define IS_BREAK_CHAR(c) \
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7 ((c) == ' ' || (c) == '\t' || \
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8 (c) == ',' || (c) == ':' || (c) == ';' || (c) == '@' || \
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9 (c) == '<' || (c) == '>' || (c) == '(' || (c) == ')' || \
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10 (c) == '[' || (c) == ']' || (c) == '=')
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11
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12 #define IS_BREAK_OR_CRLF_CHAR(c) \
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13 (IS_BREAK_CHAR(c) || (c) == '\r' || (c) == '\n')
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14
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15 static size_t next_token_quoted(const char *value, size_t len,
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16 int *need_qp, int *quoted)
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17 {
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18 size_t i;
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19
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20 *need_qp = FALSE;
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21 *quoted = TRUE;
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22
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23 for (i = *quoted ? 0 : 1; i < len; i++) {
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24 if ((unsigned char)value[i] & 0x80)
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25 *need_qp = TRUE;
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26
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27 if (value[i] == '"' || value[i] == '\r' || value[i] == '\n') {
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28 i++;
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29 *quoted = value[i] == '"';
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30 break;
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31 }
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32 }
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33
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34 return i;
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35 }
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36
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37 static size_t next_token(const char *value, size_t len,
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38 int *need_qp, int *quoted, int qp_on)
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39 {
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40 size_t i = 0;
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41
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42 if (value[0] == '"' || *quoted)
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43 return next_token_quoted(value, len, need_qp, quoted);
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44
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45 *need_qp = FALSE;
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46
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47 if (qp_on) {
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48 /* skip spaces, so we don't end up QP'ing word at a time */
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49 for (i = 0; i < len; i++) {
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50 if (value[i] != ' ')
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51 break;
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52 }
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53
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54 if (i == len)
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55 return i;
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56 }
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57
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58 if (IS_BREAK_OR_CRLF_CHAR(value[i])) {
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59 /* return all break-chars in one token */
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60 for (i++; i < len; i++) {
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61 if (!IS_BREAK_CHAR(value[i]))
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62 break;
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63 }
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64
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65 return i;
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66 }
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67
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68 /* then stop at break-char */
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69 for (; i < len; i++) {
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70 if ((unsigned char)value[i] & 0x80)
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71 *need_qp = TRUE;
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72
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73 if (IS_BREAK_OR_CRLF_CHAR(value[i]))
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74 break;
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75 }
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76
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77 return i;
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78 }
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79
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80 static void append_quoted_qp(TempString *str, const char *value, size_t len)
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81 {
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82 size_t i;
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83 unsigned char c;
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84
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85 /* do this the easy way, it's already broken behaviour to leave the
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86 8bit text in mailbox, so we shouldn't need to try too hard to make
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87 it readable. Keep 'A'..'Z', 'a'..'z' and '0'..'9', QP rest */
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88
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89 for (i = 0; i < len; i++) {
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90 if (value[i] == ' ')
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91 t_string_append_c(str, '_');
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92 else if ((value[i] >= 'A' && value[i] <= 'Z') ||
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93 (value[i] >= 'a' && value[i] <= 'z') ||
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94 (value[i] >= '0' && value[i] <= '9')) {
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95 t_string_append_c(str, value[i]);
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96 } else {
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97 t_string_append_c(str, '=');
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98 c = (unsigned char)value[i] >> 4;
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99 t_string_append_c(str, c < 10 ? (c+'0') : (c-10+'A'));
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100 c = (unsigned char)value[i] & 0x0f;
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101 t_string_append_c(str, c < 10 ? (c+'0') : (c-10+'A'));
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102 }
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103 }
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104 }
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105
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106 static void append_quoted(TempString *str, const char *value, size_t len)
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107 {
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108 size_t i;
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109
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110 for (i = 0; i < len; i++) {
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111 if (value[i] == '\\' || value[i] == '"')
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112 t_string_append_c(str, '\\');
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113 t_string_append_c(str, value[i]);
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114 }
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115 }
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116
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117 /* does two things: 1) escape '\' and '"' characters, 2) 8bit text -> QP */
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118 static TempString *get_quoted_str(const char *value, size_t value_len)
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119 {
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120 TempString *str;
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121 size_t token_len;
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122 int qp, need_qp, quoted;
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123
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124 str = t_string_new(value_len * 2);
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125 qp = FALSE;
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126 quoted = FALSE;
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127
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128 t_string_append_c(str, '"');
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129 while (value_len > 0) {
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130 token_len = next_token(value, value_len, &need_qp, &quoted, qp);
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131 i_assert(token_len > 0 && token_len <= value_len);
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132
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133 /* header may be split to multiple lines, we don't want them */
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134 while (token_len > 0 && (value[0] == '\r' ||
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135 value[0] == '\n')) {
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136 value++;
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137 token_len--;
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138 value_len--;
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139 }
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140
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141 if (need_qp && !qp) {
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142 t_string_append(str, "=?x-unknown?Q?");
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143 qp = TRUE;
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144 } else if (!need_qp && qp) {
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145 t_string_append(str, "?=");
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146 qp = FALSE;
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147 }
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148
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149 if (need_qp)
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150 append_quoted_qp(str, value, token_len);
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151 else
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152 append_quoted(str, value, token_len);
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153
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154 value += token_len;
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155 value_len -= token_len;
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156 }
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157
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158 if (qp) t_string_append(str, "?=");
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159 t_string_append_c(str, '"');
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160
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161 return str;
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162 }
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163
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164 const char *imap_quote_str_nil(const char *value)
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165 {
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166 return value == NULL ? "NIL" :
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167 get_quoted_str(value, strlen(value))->str;
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168 }
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169
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170 char *imap_quote_value(Pool pool, const char *value, size_t value_len)
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171 {
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172 TempString *str;
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173
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174 str = get_quoted_str(value, value_len);
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175 return p_strndup(pool, str->str, str->len);
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176 }