Mercurial > dovecot > core-2.2
annotate src/lib-mail/message-decoder.c @ 18153:7250ccf9ab4c
lib-mail: message-decoder now always sets output->size=0 when headers are returned.
author | Timo Sirainen <tss@iki.fi> |
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date | Thu, 15 Jan 2015 01:11:34 +0200 |
parents | 38e807433e2f |
children | 55555824f636 |
rev | line source |
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18137 | 1 /* Copyright (c) 2006-2015 Dovecot authors, see the included COPYING file */ |
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2 |
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3 #include "lib.h" |
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4 #include "buffer.h" |
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5 #include "base64.h" |
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6 #include "str.h" |
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7 #include "unichar.h" |
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8 #include "charset-utf8.h" |
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9 #include "quoted-printable.h" |
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10 #include "rfc822-parser.h" |
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11 #include "rfc2231-parser.h" |
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12 #include "message-parser.h" |
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13 #include "message-header-decode.h" |
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14 #include "message-decoder.h" |
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15 |
4885 | 16 /* base64 takes max 4 bytes per character, q-p takes max 3. */ |
17 #define MAX_ENCODING_BUF_SIZE 3 | |
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18 |
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19 struct message_decoder_context { |
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20 enum message_decoder_flags flags; |
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21 normalizer_func_t *normalizer; |
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22 struct message_part *prev_part; |
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23 |
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24 struct message_header_line hdr; |
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25 buffer_t *buf, *buf2; |
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26 |
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27 char *charset_trans_charset; |
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28 struct charset_translation *charset_trans; |
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29 char translation_buf[CHARSET_MAX_PENDING_BUF_SIZE]; |
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30 unsigned int translation_size; |
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31 |
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32 buffer_t *encoding_buf; |
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33 |
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34 char *content_charset; |
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35 enum message_cte message_cte; |
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36 |
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37 unsigned int binary_input:1; |
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38 }; |
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39 |
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40 static void |
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41 message_decode_body_init_charset(struct message_decoder_context *ctx, |
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42 struct message_part *part); |
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43 |
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44 struct message_decoder_context * |
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45 message_decoder_init(normalizer_func_t *normalizer, |
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46 enum message_decoder_flags flags) |
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47 { |
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48 struct message_decoder_context *ctx; |
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49 |
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50 ctx = i_new(struct message_decoder_context, 1); |
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51 ctx->flags = flags; |
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52 ctx->normalizer = normalizer; |
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53 ctx->buf = buffer_create_dynamic(default_pool, 8192); |
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54 ctx->buf2 = buffer_create_dynamic(default_pool, 8192); |
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55 ctx->encoding_buf = buffer_create_dynamic(default_pool, 128); |
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56 return ctx; |
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57 } |
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58 |
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59 void message_decoder_deinit(struct message_decoder_context **_ctx) |
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60 { |
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61 struct message_decoder_context *ctx = *_ctx; |
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62 |
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63 *_ctx = NULL; |
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64 |
4888 | 65 if (ctx->charset_trans != NULL) |
66 charset_to_utf8_end(&ctx->charset_trans); | |
67 | |
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68 buffer_free(&ctx->encoding_buf); |
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69 buffer_free(&ctx->buf); |
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70 buffer_free(&ctx->buf2); |
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71 i_free(ctx->charset_trans_charset); |
4888 | 72 i_free(ctx->content_charset); |
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73 i_free(ctx); |
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74 } |
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75 |
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76 void message_decoder_set_return_binary(struct message_decoder_context *ctx, |
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77 bool set) |
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78 { |
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79 if (set) |
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80 ctx->flags |= MESSAGE_DECODER_FLAG_RETURN_BINARY; |
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81 else |
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82 ctx->flags &= ~MESSAGE_DECODER_FLAG_RETURN_BINARY; |
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83 message_decode_body_init_charset(ctx, ctx->prev_part); |
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84 } |
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85 |
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86 enum message_cte message_decoder_parse_cte(struct message_header_line *hdr) |
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87 { |
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88 struct rfc822_parser_context parser; |
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89 enum message_cte message_cte; |
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90 string_t *value; |
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91 |
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92 value = t_str_new(64); |
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93 rfc822_parser_init(&parser, hdr->full_value, hdr->full_value_len, NULL); |
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94 |
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95 rfc822_skip_lwsp(&parser); |
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96 (void)rfc822_parse_mime_token(&parser, value); |
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97 |
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98 message_cte = MESSAGE_CTE_UNKNOWN; |
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99 switch (str_len(value)) { |
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100 case 4: |
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101 if (i_memcasecmp(str_data(value), "7bit", 4) == 0 || |
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102 i_memcasecmp(str_data(value), "8bit", 4) == 0) |
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103 message_cte = MESSAGE_CTE_78BIT; |
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104 break; |
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105 case 6: |
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106 if (i_memcasecmp(str_data(value), "base64", 6) == 0) |
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107 message_cte = MESSAGE_CTE_BASE64; |
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108 else if (i_memcasecmp(str_data(value), "binary", 6) == 0) |
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109 message_cte = MESSAGE_CTE_BINARY; |
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110 break; |
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111 case 16: |
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112 if (i_memcasecmp(str_data(value), "quoted-printable", 16) == 0) |
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113 message_cte = MESSAGE_CTE_QP; |
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114 break; |
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115 } |
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116 return message_cte; |
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117 } |
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118 |
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119 static void |
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120 parse_content_type(struct message_decoder_context *ctx, |
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121 struct message_header_line *hdr) |
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122 { |
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123 struct rfc822_parser_context parser; |
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124 const char *const *results; |
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125 string_t *str; |
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126 |
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127 if (ctx->content_charset != NULL) |
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128 return; |
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129 |
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130 rfc822_parser_init(&parser, hdr->full_value, hdr->full_value_len, NULL); |
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131 rfc822_skip_lwsp(&parser); |
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132 str = t_str_new(64); |
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133 if (rfc822_parse_content_type(&parser, str) <= 0) |
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134 return; |
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135 |
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136 rfc2231_parse(&parser, &results); |
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137 for (; *results != NULL; results += 2) { |
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138 if (strcasecmp(results[0], "charset") == 0) { |
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139 ctx->content_charset = i_strdup(results[1]); |
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140 break; |
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141 } |
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142 } |
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143 } |
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144 |
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145 static bool message_decode_header(struct message_decoder_context *ctx, |
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146 struct message_header_line *hdr, |
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147 struct message_block *output) |
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148 { |
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149 size_t value_len; |
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150 |
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151 if (hdr->continues) { |
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152 hdr->use_full_value = TRUE; |
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153 return FALSE; |
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154 } |
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155 |
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156 T_BEGIN { |
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157 if (hdr->name_len == 12 && |
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158 strcasecmp(hdr->name, "Content-Type") == 0) |
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159 parse_content_type(ctx, hdr); |
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160 if (hdr->name_len == 25 && |
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161 strcasecmp(hdr->name, "Content-Transfer-Encoding") == 0) |
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162 ctx->message_cte = message_decoder_parse_cte(hdr); |
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163 } T_END; |
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164 |
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165 buffer_set_used_size(ctx->buf, 0); |
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166 message_header_decode_utf8(hdr->full_value, hdr->full_value_len, |
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167 ctx->buf, ctx->normalizer); |
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168 value_len = ctx->buf->used; |
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169 |
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170 if (ctx->normalizer != NULL) { |
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171 (void)ctx->normalizer(hdr->name, hdr->name_len, ctx->buf); |
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172 buffer_append_c(ctx->buf, '\0'); |
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173 } else { |
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174 if (!uni_utf8_get_valid_data((const unsigned char *)hdr->name, |
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175 hdr->name_len, ctx->buf)) |
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176 buffer_append_c(ctx->buf, '\0'); |
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177 } |
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178 |
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179 ctx->hdr = *hdr; |
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180 ctx->hdr.full_value = ctx->buf->data; |
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181 ctx->hdr.full_value_len = value_len; |
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182 ctx->hdr.value_len = 0; |
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183 if (ctx->buf->used != value_len) { |
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184 ctx->hdr.name = CONST_PTR_OFFSET(ctx->buf->data, |
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185 ctx->hdr.full_value_len); |
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186 ctx->hdr.name_len = ctx->buf->used - 1 - value_len; |
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187 } |
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188 |
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189 output->hdr = &ctx->hdr; |
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190 return TRUE; |
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191 } |
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192 |
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193 static void translation_buf_decode(struct message_decoder_context *ctx, |
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194 const unsigned char **data, size_t *size) |
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195 { |
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196 unsigned char trans_buf[CHARSET_MAX_PENDING_BUF_SIZE+1]; |
6832 | 197 unsigned int data_wanted, skip; |
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198 size_t trans_size, orig_size; |
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199 |
6832 | 200 /* @UNSAFE: move the previously untranslated bytes to trans_buf |
201 and see if we have now enough data to get the next character | |
202 translated */ | |
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203 memcpy(trans_buf, ctx->translation_buf, ctx->translation_size); |
6832 | 204 data_wanted = sizeof(trans_buf) - ctx->translation_size; |
205 if (data_wanted > *size) | |
206 data_wanted = *size; | |
207 memcpy(trans_buf + ctx->translation_size, *data, data_wanted); | |
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208 |
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209 orig_size = trans_size = ctx->translation_size + data_wanted; |
6832 | 210 (void)charset_to_utf8(ctx->charset_trans, trans_buf, |
211 &trans_size, ctx->buf2); | |
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212 |
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213 if (trans_size <= ctx->translation_size) { |
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214 /* need more data to finish the translation. */ |
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215 i_assert(orig_size < CHARSET_MAX_PENDING_BUF_SIZE); |
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216 memcpy(ctx->translation_buf, trans_buf, orig_size); |
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217 ctx->translation_size = orig_size; |
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218 *data += *size; |
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219 *size = 0; |
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220 return; |
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221 } |
6832 | 222 skip = trans_size - ctx->translation_size; |
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223 |
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224 i_assert(*size >= skip); |
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225 *data += skip; |
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226 *size -= skip; |
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227 |
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228 ctx->translation_size = 0; |
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229 } |
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230 |
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231 static void |
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232 message_decode_body_init_charset(struct message_decoder_context *ctx, |
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233 struct message_part *part) |
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234 { |
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235 ctx->binary_input = ctx->content_charset == NULL && |
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236 (ctx->flags & MESSAGE_DECODER_FLAG_RETURN_BINARY) != 0 && |
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237 (part->flags & (MESSAGE_PART_FLAG_TEXT | |
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238 MESSAGE_PART_FLAG_MESSAGE_RFC822)) == 0; |
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239 |
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240 if (ctx->binary_input) |
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241 return; |
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242 |
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243 if (ctx->charset_trans != NULL && ctx->content_charset != NULL && |
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244 strcasecmp(ctx->content_charset, ctx->charset_trans_charset) == 0) { |
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245 /* already have the correct translation selected */ |
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246 return; |
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247 } |
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248 |
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249 if (ctx->charset_trans != NULL) |
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250 charset_to_utf8_end(&ctx->charset_trans); |
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251 i_free_and_null(ctx->charset_trans_charset); |
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252 |
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253 ctx->charset_trans_charset = i_strdup(ctx->content_charset != NULL ? |
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254 ctx->content_charset : "UTF-8"); |
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255 if (charset_to_utf8_begin(ctx->charset_trans_charset, ctx->normalizer, |
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256 &ctx->charset_trans) < 0) |
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257 ctx->charset_trans = charset_utf8_to_utf8_begin(ctx->normalizer); |
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258 } |
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259 |
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260 static bool message_decode_body(struct message_decoder_context *ctx, |
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261 struct message_block *input, |
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262 struct message_block *output) |
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263 { |
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264 const unsigned char *data = NULL; |
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265 size_t pos = 0, size = 0; |
5510 | 266 int ret; |
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267 |
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268 if (ctx->encoding_buf->used != 0) { |
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269 /* @UNSAFE */ |
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270 buffer_append(ctx->encoding_buf, input->data, input->size); |
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271 } |
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272 |
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273 switch (ctx->message_cte) { |
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274 case MESSAGE_CTE_UNKNOWN: |
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275 /* just skip this body */ |
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276 return FALSE; |
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277 |
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278 case MESSAGE_CTE_78BIT: |
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279 case MESSAGE_CTE_BINARY: |
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280 data = input->data; |
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281 size = pos = input->size; |
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282 break; |
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283 case MESSAGE_CTE_QP: |
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284 buffer_set_used_size(ctx->buf, 0); |
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285 if (ctx->encoding_buf->used != 0) { |
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286 (void)quoted_printable_decode(ctx->encoding_buf->data, |
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287 ctx->encoding_buf->used, |
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288 &pos, ctx->buf); |
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289 } else { |
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290 (void)quoted_printable_decode(input->data, input->size, |
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291 &pos, ctx->buf); |
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292 } |
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293 data = ctx->buf->data; |
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294 size = ctx->buf->used; |
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295 break; |
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296 case MESSAGE_CTE_BASE64: |
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297 buffer_set_used_size(ctx->buf, 0); |
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298 if (ctx->encoding_buf->used != 0) { |
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299 ret = base64_decode(ctx->encoding_buf->data, |
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300 ctx->encoding_buf->used, |
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301 &pos, ctx->buf); |
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302 } else { |
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303 ret = base64_decode(input->data, input->size, |
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304 &pos, ctx->buf); |
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305 } |
5510 | 306 if (ret < 0) { |
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307 /* corrupted base64 data, don't bother with |
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308 the rest of it */ |
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309 return FALSE; |
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310 } |
5510 | 311 if (ret == 0) { |
4885 | 312 /* end of base64 input */ |
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313 pos = input->size; |
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314 buffer_set_used_size(ctx->encoding_buf, 0); |
4885 | 315 } |
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316 data = ctx->buf->data; |
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317 size = ctx->buf->used; |
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318 break; |
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319 } |
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320 |
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321 if (ctx->encoding_buf->used != 0) |
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322 buffer_delete(ctx->encoding_buf, 0, pos); |
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323 else if (pos != input->size) { |
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324 buffer_append(ctx->encoding_buf, |
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325 input->data + pos, input->size - pos); |
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326 } |
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327 |
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328 if (ctx->binary_input) { |
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329 output->data = data; |
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330 output->size = size; |
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331 } else { |
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332 buffer_set_used_size(ctx->buf2, 0); |
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333 if (ctx->translation_size != 0) |
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334 translation_buf_decode(ctx, &data, &size); |
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335 |
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336 pos = size; |
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337 (void)charset_to_utf8(ctx->charset_trans, |
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338 data, &pos, ctx->buf2); |
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339 if (pos != size) { |
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340 ctx->translation_size = size - pos; |
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341 i_assert(ctx->translation_size <= |
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342 sizeof(ctx->translation_buf)); |
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343 memcpy(ctx->translation_buf, data + pos, |
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344 ctx->translation_size); |
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345 } |
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346 output->data = ctx->buf2->data; |
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347 output->size = ctx->buf2->used; |
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348 } |
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349 |
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350 output->hdr = NULL; |
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351 return TRUE; |
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352 } |
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353 |
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354 bool message_decoder_decode_next_block(struct message_decoder_context *ctx, |
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355 struct message_block *input, |
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356 struct message_block *output) |
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357 { |
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Don't try to access output variable's contents. They are undefined at least
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358 if (input->part != ctx->prev_part) { |
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359 /* MIME part changed. */ |
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360 message_decoder_decode_reset(ctx); |
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361 } |
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362 |
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363 output->part = input->part; |
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364 ctx->prev_part = input->part; |
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365 |
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366 if (input->hdr != NULL) { |
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367 output->size = 0; |
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368 return message_decode_header(ctx, input->hdr, output); |
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369 } else if (input->size != 0) |
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370 return message_decode_body(ctx, input, output); |
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371 else { |
6942 | 372 output->hdr = NULL; |
373 output->size = 0; | |
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374 message_decode_body_init_charset(ctx, input->part); |
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375 return TRUE; |
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376 } |
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377 } |
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378 |
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379 void message_decoder_decode_reset(struct message_decoder_context *ctx) |
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380 { |
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381 i_free_and_null(ctx->content_charset); |
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382 ctx->message_cte = MESSAGE_CTE_78BIT; |
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383 buffer_set_used_size(ctx->encoding_buf, 0); |
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384 } |