Mercurial > dovecot > core-2.2
annotate src/lib-mail/message-decoder.c @ 7950:3412c43d6707 HEAD
Merge RFC 2231 header continuations in BODY/BODYSTRUCTURE replies. Also use
them internally while parsing messages.
author | Timo Sirainen <tss@iki.fi> |
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date | Tue, 24 Jun 2008 16:49:36 +0300 |
parents | e6693a0ec8e1 |
children | b9faf4db2a9f |
rev | line source |
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Updated copyright notices to include year 2008.
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1 /* Copyright (c) 2006-2008 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 |
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16 enum content_type { |
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17 CONTENT_TYPE_UNKNOWN = 0, |
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18 CONTENT_TYPE_BINARY, |
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19 CONTENT_TYPE_QP, |
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20 CONTENT_TYPE_BASE64 |
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21 }; |
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22 |
4885 | 23 /* base64 takes max 4 bytes per character, q-p takes max 3. */ |
24 #define MAX_ENCODING_BUF_SIZE 3 | |
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25 |
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26 /* UTF-8 takes max 5 bytes per character. Not sure about others, but I'd think |
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27 10 is more than enough for everyone.. */ |
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28 #define MAX_TRANSLATION_BUF_SIZE 10 |
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29 |
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30 struct message_decoder_context { |
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31 struct message_part *prev_part; |
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32 |
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33 struct message_header_line hdr; |
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34 buffer_t *buf, *buf2; |
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35 |
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36 char *charset_trans_charset; |
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37 struct charset_translation *charset_trans; |
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38 char translation_buf[MAX_TRANSLATION_BUF_SIZE]; |
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39 unsigned int translation_size; |
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40 |
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41 char encoding_buf[MAX_ENCODING_BUF_SIZE]; |
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42 unsigned int encoding_size; |
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43 |
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44 char *content_charset; |
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45 enum content_type content_type; |
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46 |
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47 unsigned int dtcase:1; |
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48 unsigned int charset_utf8:1; |
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49 }; |
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50 |
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51 struct message_decoder_context *message_decoder_init(bool dtcase) |
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52 { |
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53 struct message_decoder_context *ctx; |
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54 |
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55 ctx = i_new(struct message_decoder_context, 1); |
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56 ctx->dtcase = dtcase; |
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57 ctx->buf = buffer_create_dynamic(default_pool, 8192); |
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58 ctx->buf2 = buffer_create_dynamic(default_pool, 8192); |
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59 return ctx; |
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60 } |
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61 |
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62 void message_decoder_deinit(struct message_decoder_context **_ctx) |
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63 { |
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64 struct message_decoder_context *ctx = *_ctx; |
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65 |
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66 *_ctx = NULL; |
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67 |
4888 | 68 if (ctx->charset_trans != NULL) |
69 charset_to_utf8_end(&ctx->charset_trans); | |
70 | |
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71 buffer_free(&ctx->buf); |
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72 buffer_free(&ctx->buf2); |
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73 i_free(ctx->charset_trans_charset); |
4888 | 74 i_free(ctx->content_charset); |
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75 i_free(ctx); |
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76 } |
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77 |
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78 static void |
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79 parse_content_transfer_encoding(struct message_decoder_context *ctx, |
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80 struct message_header_line *hdr) |
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81 { |
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82 struct rfc822_parser_context parser; |
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83 string_t *value; |
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84 |
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85 value = t_str_new(64); |
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86 rfc822_parser_init(&parser, hdr->full_value, hdr->full_value_len, NULL); |
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87 |
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88 (void)rfc822_skip_lwsp(&parser); |
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89 (void)rfc822_parse_mime_token(&parser, value); |
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90 |
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91 ctx->content_type = CONTENT_TYPE_UNKNOWN; |
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92 switch (str_len(value)) { |
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93 case 4: |
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94 if (i_memcasecmp(str_data(value), "7bit", 4) == 0 || |
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95 i_memcasecmp(str_data(value), "8bit", 4) == 0) |
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96 ctx->content_type = CONTENT_TYPE_BINARY; |
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97 break; |
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98 case 6: |
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99 if (i_memcasecmp(str_data(value), "base64", 6) == 0) |
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100 ctx->content_type = CONTENT_TYPE_BASE64; |
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101 else if (i_memcasecmp(str_data(value), "binary", 6) == 0) |
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102 ctx->content_type = CONTENT_TYPE_BINARY; |
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103 break; |
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104 case 16: |
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105 if (i_memcasecmp(str_data(value), "quoted-printable", 16) == 0) |
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106 ctx->content_type = CONTENT_TYPE_QP; |
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107 break; |
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108 } |
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109 } |
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110 |
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111 static void |
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112 parse_content_type(struct message_decoder_context *ctx, |
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113 struct message_header_line *hdr) |
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114 { |
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115 struct rfc822_parser_context parser; |
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116 const char *const *results; |
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117 string_t *str; |
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118 |
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119 if (ctx->content_charset != NULL) |
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120 return; |
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121 |
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122 rfc822_parser_init(&parser, hdr->full_value, hdr->full_value_len, NULL); |
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123 (void)rfc822_skip_lwsp(&parser); |
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124 str = t_str_new(64); |
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125 if (rfc822_parse_content_type(&parser, str) <= 0) |
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126 return; |
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127 |
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128 (void)rfc2231_parse(&parser, &results); |
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129 for (; *results != NULL; results += 2) { |
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130 if (strcasecmp(results[0], "charset") == 0) { |
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131 ctx->content_charset = i_strdup(results[1]); |
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132 ctx->charset_utf8 = charset_is_utf8(results[1]); |
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133 break; |
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134 } |
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135 } |
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136 } |
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137 |
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138 static bool message_decode_header(struct message_decoder_context *ctx, |
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139 struct message_header_line *hdr, |
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140 struct message_block *output) |
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141 { |
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142 size_t value_len; |
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143 |
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144 if (hdr->continues) { |
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145 hdr->use_full_value = TRUE; |
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146 return FALSE; |
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147 } |
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148 |
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149 T_BEGIN { |
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150 if (hdr->name_len == 12 && |
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151 strcasecmp(hdr->name, "Content-Type") == 0) |
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152 parse_content_type(ctx, hdr); |
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153 if (hdr->name_len == 25 && |
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154 strcasecmp(hdr->name, "Content-Transfer-Encoding") == 0) |
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155 parse_content_transfer_encoding(ctx, hdr); |
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156 } T_END; |
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157 |
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158 buffer_set_used_size(ctx->buf, 0); |
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159 message_header_decode_utf8(hdr->full_value, hdr->full_value_len, |
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160 ctx->buf, ctx->dtcase); |
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161 value_len = ctx->buf->used; |
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162 |
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163 if (ctx->dtcase) { |
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164 (void)uni_utf8_to_decomposed_titlecase(hdr->name, hdr->name_len, |
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165 ctx->buf); |
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166 buffer_append_c(ctx->buf, '\0'); |
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167 } |
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168 |
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169 ctx->hdr = *hdr; |
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170 ctx->hdr.full_value = ctx->buf->data; |
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171 ctx->hdr.full_value_len = value_len; |
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172 ctx->hdr.value_len = 0; |
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173 if (ctx->dtcase) { |
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174 ctx->hdr.name = CONST_PTR_OFFSET(ctx->buf->data, |
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175 ctx->hdr.full_value_len); |
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176 ctx->hdr.name_len = ctx->buf->used - 1 - value_len; |
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177 } |
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178 |
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179 output->hdr = &ctx->hdr; |
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180 return TRUE; |
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181 } |
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182 |
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183 static void translation_buf_decode(struct message_decoder_context *ctx, |
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184 const unsigned char **data, size_t *size) |
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185 { |
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186 unsigned char trans_buf[MAX_TRANSLATION_BUF_SIZE+1]; |
6832 | 187 unsigned int data_wanted, skip; |
188 size_t trans_size; | |
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189 |
6832 | 190 /* @UNSAFE: move the previously untranslated bytes to trans_buf |
191 and see if we have now enough data to get the next character | |
192 translated */ | |
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193 memcpy(trans_buf, ctx->translation_buf, ctx->translation_size); |
6832 | 194 data_wanted = sizeof(trans_buf) - ctx->translation_size; |
195 if (data_wanted > *size) | |
196 data_wanted = *size; | |
197 memcpy(trans_buf + ctx->translation_size, *data, data_wanted); | |
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198 |
6832 | 199 trans_size = ctx->translation_size + data_wanted; |
200 (void)charset_to_utf8(ctx->charset_trans, trans_buf, | |
201 &trans_size, ctx->buf2); | |
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202 |
6832 | 203 i_assert(trans_size > ctx->translation_size); |
204 skip = trans_size - ctx->translation_size; | |
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205 |
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206 i_assert(*size >= skip); |
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207 *data += skip; |
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208 *size -= skip; |
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209 |
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210 ctx->translation_size = 0; |
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211 } |
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212 |
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213 static void message_decode_body_init_charset(struct message_decoder_context *ctx) |
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214 { |
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215 enum charset_flags flags; |
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216 |
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217 if (ctx->charset_utf8) |
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218 return; |
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219 |
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220 if (ctx->charset_trans != NULL && |
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221 strcasecmp(ctx->content_charset, ctx->charset_trans_charset) == 0) { |
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222 /* already have the correct translation selected */ |
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223 return; |
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224 } |
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225 |
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226 if (ctx->charset_trans != NULL) |
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227 charset_to_utf8_end(&ctx->charset_trans); |
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228 i_free(ctx->charset_trans_charset); |
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229 |
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230 flags = ctx->dtcase ? CHARSET_FLAG_DECOMP_TITLECASE : 0; |
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231 ctx->charset_trans_charset = i_strdup(ctx->content_charset != NULL ? |
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232 ctx->content_charset : "UTF-8"); |
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233 if (charset_to_utf8_begin(ctx->charset_trans_charset, |
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234 flags, &ctx->charset_trans) < 0) |
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235 ctx->charset_trans = NULL; |
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236 } |
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237 |
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238 static bool message_decode_body(struct message_decoder_context *ctx, |
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239 struct message_block *input, |
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240 struct message_block *output) |
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241 { |
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242 unsigned char new_buf[MAX_ENCODING_BUF_SIZE+1]; |
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243 const unsigned char *data = NULL; |
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244 size_t pos, size = 0, skip = 0; |
5510 | 245 int ret; |
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246 |
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247 if (ctx->encoding_size != 0) { |
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248 /* @UNSAFE */ |
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249 memcpy(new_buf, ctx->encoding_buf, ctx->encoding_size); |
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250 skip = sizeof(new_buf) - ctx->encoding_size; |
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251 if (skip > input->size) |
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252 skip = input->size; |
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253 memcpy(new_buf + ctx->encoding_size, input->data, skip); |
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254 } |
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255 |
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256 switch (ctx->content_type) { |
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257 case CONTENT_TYPE_UNKNOWN: |
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258 /* just skip this body */ |
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259 return FALSE; |
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260 |
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261 case CONTENT_TYPE_BINARY: |
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262 data = input->data; |
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263 size = pos = input->size; |
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264 break; |
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265 case CONTENT_TYPE_QP: |
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266 buffer_set_used_size(ctx->buf, 0); |
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267 if (ctx->encoding_size != 0) { |
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268 quoted_printable_decode(new_buf, |
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269 ctx->encoding_size + skip, |
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270 &pos, ctx->buf); |
5422 | 271 i_assert(pos >= ctx->encoding_size); |
4885 | 272 skip = pos - ctx->encoding_size; |
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273 } |
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274 |
4885 | 275 quoted_printable_decode(input->data + skip, input->size - skip, |
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276 &pos, ctx->buf); |
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277 pos += skip; |
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278 data = ctx->buf->data; |
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279 size = ctx->buf->used; |
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280 break; |
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281 case CONTENT_TYPE_BASE64: |
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282 buffer_set_used_size(ctx->buf, 0); |
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283 if (ctx->encoding_size != 0) { |
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284 if (base64_decode(new_buf, ctx->encoding_size + skip, |
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285 &pos, ctx->buf) < 0) { |
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286 /* corrupted base64 data, don't bother with |
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287 the rest of it */ |
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288 return FALSE; |
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289 } |
5422 | 290 i_assert(pos >= ctx->encoding_size); |
4885 | 291 skip = pos - ctx->encoding_size; |
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292 } |
5510 | 293 ret = base64_decode(input->data + skip, input->size - skip, |
294 &pos, ctx->buf); | |
295 if (ret < 0) { | |
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296 /* corrupted base64 data, don't bother with |
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297 the rest of it */ |
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298 return FALSE; |
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299 } |
5510 | 300 if (ret == 0) { |
4885 | 301 /* end of base64 input */ |
302 pos = input->size - skip; | |
303 } | |
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304 pos += skip; |
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305 data = ctx->buf->data; |
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306 size = ctx->buf->used; |
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307 break; |
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308 } |
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309 |
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310 if (pos != input->size) { |
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311 /* @UNSAFE */ |
4885 | 312 i_assert(pos < input->size); |
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313 ctx->encoding_size = input->size - pos; |
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314 i_assert(ctx->encoding_size <= sizeof(ctx->encoding_buf)); |
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315 memcpy(ctx->encoding_buf, input->data + pos, |
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316 ctx->encoding_size); |
5422 | 317 } else { |
318 ctx->encoding_size = 0; | |
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319 } |
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320 |
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321 if (ctx->charset_utf8) { |
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322 buffer_set_used_size(ctx->buf2, 0); |
6133
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Renamed ucase parameters to dtcase which is more correct.
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323 if (ctx->dtcase) { |
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Use uni_utf8_to_decomposed_titlecase() to have proper case-insensitive UTF-8
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324 (void)uni_utf8_to_decomposed_titlecase(data, size, |
6579 | 325 ctx->buf2); |
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326 output->data = ctx->buf2->data; |
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327 output->size = ctx->buf2->used; |
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328 } else if (uni_utf8_get_valid_data(data, size, ctx->buf2)) { |
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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 output->data = ctx->buf2->data; |
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333 output->size = ctx->buf2->used; |
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334 } |
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335 } else if (ctx->charset_trans == NULL) { |
6915
671c2eb25f3d
Remove illegal UTF-8 sequences from output.
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336 /* unknown charset */ |
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337 buffer_set_used_size(ctx->buf2, 0); |
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338 if (uni_utf8_get_valid_data(data, size, ctx->buf2)) { |
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339 output->data = data; |
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340 output->size = size; |
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341 } else { |
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342 output->data = ctx->buf2->data; |
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343 output->size = ctx->buf2->used; |
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344 } |
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345 } else { |
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346 buffer_set_used_size(ctx->buf2, 0); |
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347 if (ctx->translation_size != 0) |
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348 translation_buf_decode(ctx, &data, &size); |
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349 |
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350 pos = size; |
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351 (void)charset_to_utf8(ctx->charset_trans, |
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352 data, &pos, ctx->buf2); |
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353 if (pos != size) { |
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354 ctx->translation_size = size - pos; |
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355 i_assert(ctx->translation_size <= |
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356 sizeof(ctx->translation_buf)); |
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357 memcpy(ctx->translation_buf, data + pos, |
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358 ctx->translation_size); |
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359 } |
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360 output->data = ctx->buf2->data; |
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361 output->size = ctx->buf2->used; |
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362 } |
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363 |
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364 output->hdr = NULL; |
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365 return TRUE; |
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366 } |
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367 |
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368 bool message_decoder_decode_next_block(struct message_decoder_context *ctx, |
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369 struct message_block *input, |
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370 struct message_block *output) |
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371 { |
5410
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Don't try to access output variable's contents. They are undefined at least
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4903
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changeset
|
372 if (input->part != ctx->prev_part) { |
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373 /* MIME part changed. */ |
6916
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Message decoding wasn't reset properly between messages when searching.
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|
374 message_decoder_decode_reset(ctx); |
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375 } |
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376 |
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377 output->part = input->part; |
5410
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Don't try to access output variable's contents. They are undefined at least
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378 ctx->prev_part = input->part; |
4608
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Added message-decoder to decode message's contents into readable UTF-8.
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379 |
61e0fe257a83
Added message-decoder to decode message's contents into readable UTF-8.
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380 if (input->hdr != NULL) |
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381 return message_decode_header(ctx, input->hdr, output); |
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Message decoding wasn't reset properly between messages when searching.
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382 else if (input->size != 0) |
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383 return message_decode_body(ctx, input, output); |
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parents:
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384 else { |
6942 | 385 output->hdr = NULL; |
386 output->size = 0; | |
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387 message_decode_body_init_charset(ctx); |
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388 return TRUE; |
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389 } |
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390 } |
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parents:
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391 |
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parents:
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392 void message_decoder_decode_reset(struct message_decoder_context *ctx) |
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393 { |
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394 i_free_and_null(ctx->content_charset); |
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395 ctx->content_type = CONTENT_TYPE_BINARY; |
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parents:
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396 ctx->charset_utf8 = TRUE; |
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parents:
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397 ctx->encoding_size = 0; |
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parents:
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398 } |