Mercurial > dovecot > core-2.2
annotate src/lib-mail/message-decoder.c @ 6117:9214044ce1f1 HEAD
Removed message-content-parser. Instead added rfc822_parse_content_type()
and rfc822_parse_content_param() to help parse such headers.
author | Timo Sirainen <tss@iki.fi> |
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date | Fri, 20 Jul 2007 09:42:25 +0300 |
parents | 325667778ae3 |
children | 841b052e269e |
rev | line source |
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4608
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1 /* Copyright (C) 2006 Timo Sirainen */ |
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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 "charset-utf8.h" |
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8 #include "quoted-printable.h" |
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9 #include "rfc822-parser.h" |
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10 #include "message-parser.h" |
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11 #include "message-header-decode.h" |
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12 #include "message-decoder.h" |
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13 |
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14 enum content_type { |
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15 CONTENT_TYPE_UNKNOWN = 0, |
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16 CONTENT_TYPE_BINARY, |
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17 CONTENT_TYPE_QP, |
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18 CONTENT_TYPE_BASE64 |
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19 }; |
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20 |
4885 | 21 /* base64 takes max 4 bytes per character, q-p takes max 3. */ |
22 #define MAX_ENCODING_BUF_SIZE 3 | |
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23 |
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24 /* UTF-8 takes max 5 bytes per character. Not sure about others, but I'd think |
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25 10 is more than enough for everyone.. */ |
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26 #define MAX_TRANSLATION_BUF_SIZE 10 |
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27 |
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28 struct message_decoder_context { |
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29 struct message_part *prev_part; |
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30 |
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31 struct message_header_line hdr; |
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32 buffer_t *buf, *buf2; |
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33 |
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34 struct charset_translation *charset_trans; |
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35 char translation_buf[MAX_TRANSLATION_BUF_SIZE]; |
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36 unsigned int translation_size; |
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37 |
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38 char encoding_buf[MAX_ENCODING_BUF_SIZE]; |
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39 unsigned int encoding_size; |
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40 |
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41 char *content_charset; |
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42 enum content_type content_type; |
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43 |
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44 unsigned int ucase:1; |
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45 unsigned int charset_utf8:1; |
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46 }; |
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47 |
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48 struct message_decoder_context *message_decoder_init(bool ucase) |
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49 { |
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50 struct message_decoder_context *ctx; |
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51 |
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52 ctx = i_new(struct message_decoder_context, 1); |
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53 ctx->ucase = ucase; |
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54 ctx->buf = buffer_create_dynamic(default_pool, 8192); |
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55 ctx->buf2 = buffer_create_dynamic(default_pool, 8192); |
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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->buf); |
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69 buffer_free(ctx->buf2); |
4888 | 70 i_free(ctx->content_charset); |
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71 i_free(ctx); |
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72 } |
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73 |
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74 static bool |
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75 message_decode_header_callback(const unsigned char *data, size_t size, |
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76 const char *charset, void *context) |
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77 { |
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78 struct message_decoder_context *ctx = context; |
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79 struct charset_translation *t; |
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80 bool unknown_charset; |
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81 |
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82 if (charset == NULL || charset_is_utf8(charset)) { |
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83 /* ASCII / UTF-8 */ |
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84 if (ctx->ucase) { |
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85 charset_utf8_ucase_write(ctx->buf, ctx->buf->used, |
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86 data, size); |
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87 } else { |
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88 buffer_append(ctx->buf, data, size); |
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89 } |
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90 return TRUE; |
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91 } |
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92 |
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93 t = charset_to_utf8_begin(charset, ctx->ucase, &unknown_charset); |
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94 if (unknown_charset) { |
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95 /* let's just ignore this part */ |
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96 return TRUE; |
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97 } |
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98 |
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99 /* ignore any errors */ |
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100 (void)charset_to_utf8_full(t, data, &size, ctx->buf); |
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101 charset_to_utf8_end(&t); |
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102 return TRUE; |
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103 } |
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104 |
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105 static void |
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106 parse_content_transfer_encoding(struct message_decoder_context *ctx, |
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107 struct message_header_line *hdr) |
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108 { |
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109 struct rfc822_parser_context parser; |
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110 string_t *value; |
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111 |
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112 t_push(); |
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113 value = t_str_new(64); |
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114 rfc822_parser_init(&parser, hdr->full_value, hdr->full_value_len, NULL); |
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115 |
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116 (void)rfc822_skip_lwsp(&parser); |
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117 (void)rfc822_parse_mime_token(&parser, value); |
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118 |
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119 switch (str_len(value)) { |
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120 case 4: |
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121 if (memcasecmp(str_data(value), "7bit", 4) == 0 || |
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122 memcasecmp(str_data(value), "8bit", 4) == 0) |
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123 ctx->content_type = CONTENT_TYPE_BINARY; |
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124 break; |
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125 case 6: |
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126 if (memcasecmp(str_data(value), "base64", 6) == 0) |
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127 ctx->content_type = CONTENT_TYPE_BASE64; |
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128 else if (memcasecmp(str_data(value), "binary", 6) == 0) |
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129 ctx->content_type = CONTENT_TYPE_BINARY; |
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130 break; |
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131 case 16: |
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132 if (memcasecmp(str_data(value), "quoted-printable", 16) == 0) |
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133 ctx->content_type = CONTENT_TYPE_QP; |
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134 break; |
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135 } |
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136 t_pop(); |
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137 } |
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138 |
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139 static void |
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140 parse_content_type(struct message_decoder_context *ctx, |
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141 struct message_header_line *hdr) |
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142 { |
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143 struct rfc822_parser_context parser; |
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144 const char *key, *value; |
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145 string_t *str; |
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146 |
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147 if (ctx->content_charset != NULL) |
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148 return; |
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149 |
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150 rfc822_parser_init(&parser, hdr->full_value, hdr->full_value_len, NULL); |
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151 (void)rfc822_skip_lwsp(&parser); |
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152 t_push(); |
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153 str = t_str_new(64); |
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154 if (rfc822_parse_content_type(&parser, str) <= 0) { |
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155 t_pop(); |
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156 return; |
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157 } |
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158 |
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159 while (rfc822_parse_content_param(&parser, &key, &value) > 0) { |
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160 if (strcasecmp(key, "charset") == 0) { |
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161 ctx->content_charset = i_strdup(value); |
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162 ctx->charset_utf8 = charset_is_utf8(value); |
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163 break; |
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164 } |
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165 } |
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166 t_pop(); |
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167 } |
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168 |
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169 static bool message_decode_header(struct message_decoder_context *ctx, |
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170 struct message_header_line *hdr, |
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171 struct message_block *output) |
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172 { |
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173 size_t value_len; |
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174 |
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175 if (hdr->continues) { |
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176 hdr->use_full_value = TRUE; |
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177 return FALSE; |
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178 } |
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179 |
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180 if (hdr->name_len == 12 && |
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181 strcasecmp(hdr->name, "Content-Type") == 0) |
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182 parse_content_type(ctx, hdr); |
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183 if (hdr->name_len == 25 && |
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184 strcasecmp(hdr->name, "Content-Transfer-Encoding") == 0) |
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185 parse_content_transfer_encoding(ctx, hdr); |
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186 |
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187 buffer_set_used_size(ctx->buf, 0); |
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188 message_header_decode(hdr->full_value, hdr->full_value_len, |
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189 message_decode_header_callback, ctx); |
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190 value_len = ctx->buf->used; |
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191 |
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192 if (ctx->ucase) { |
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193 charset_utf8_ucase_write(ctx->buf, ctx->buf->used, |
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194 (const unsigned char *)hdr->name, |
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195 hdr->name_len); |
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196 buffer_append_c(ctx->buf, '\0'); |
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197 } |
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198 |
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199 ctx->hdr = *hdr; |
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200 ctx->hdr.full_value = ctx->buf->data; |
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201 ctx->hdr.full_value_len = value_len; |
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202 ctx->hdr.value_len = 0; |
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203 if (ctx->ucase) { |
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204 ctx->hdr.name = CONST_PTR_OFFSET(ctx->buf->data, |
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205 ctx->hdr.full_value_len); |
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206 ctx->hdr.name_len = ctx->buf->used - 1 - value_len; |
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207 } |
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208 |
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209 output->hdr = &ctx->hdr; |
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210 return TRUE; |
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211 } |
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212 |
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213 static void translation_buf_decode(struct message_decoder_context *ctx, |
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214 const unsigned char **data, size_t *size) |
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215 { |
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216 unsigned char trans_buf[MAX_TRANSLATION_BUF_SIZE+1]; |
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217 size_t pos, skip; |
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218 |
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219 /* @UNSAFE */ |
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220 memcpy(trans_buf, ctx->translation_buf, ctx->translation_size); |
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221 skip = sizeof(trans_buf) - ctx->translation_size; |
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222 if (skip > *size) |
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223 skip = *size; |
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224 memcpy(trans_buf + ctx->translation_size, data, skip); |
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225 |
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226 pos = *size; |
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227 (void)charset_to_utf8_full(ctx->charset_trans, |
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228 *data, &pos, ctx->buf2); |
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229 |
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230 i_assert(pos > ctx->translation_size); |
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231 skip = (ctx->translation_size + skip) - pos; |
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232 |
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233 i_assert(*size >= skip); |
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234 *data += skip; |
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235 *size -= skip; |
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236 |
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237 ctx->translation_size = 0; |
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238 } |
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239 |
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240 static bool message_decode_body(struct message_decoder_context *ctx, |
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241 struct message_block *input, |
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242 struct message_block *output) |
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243 { |
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244 unsigned char new_buf[MAX_ENCODING_BUF_SIZE+1]; |
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245 const unsigned char *data = NULL; |
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246 size_t pos, size = 0, skip = 0; |
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247 bool unknown_charset; |
5510 | 248 int ret; |
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249 |
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250 if (ctx->charset_trans == NULL && !ctx->charset_utf8) { |
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251 ctx->charset_trans = |
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252 charset_to_utf8_begin(ctx->content_charset != NULL ? |
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253 ctx->content_charset : "UTF-8", |
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254 ctx->ucase, |
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255 &unknown_charset); |
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256 } |
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257 |
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258 if (ctx->encoding_size != 0) { |
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259 /* @UNSAFE */ |
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260 memcpy(new_buf, ctx->encoding_buf, ctx->encoding_size); |
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261 skip = sizeof(new_buf) - ctx->encoding_size; |
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262 if (skip > input->size) |
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263 skip = input->size; |
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264 memcpy(new_buf + ctx->encoding_size, input->data, skip); |
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265 } |
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266 |
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267 switch (ctx->content_type) { |
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268 case CONTENT_TYPE_UNKNOWN: |
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269 /* just skip this body */ |
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270 return FALSE; |
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271 |
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272 case CONTENT_TYPE_BINARY: |
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273 data = input->data; |
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274 size = pos = input->size; |
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275 break; |
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276 case CONTENT_TYPE_QP: |
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277 buffer_set_used_size(ctx->buf, 0); |
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278 if (ctx->encoding_size != 0) { |
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279 quoted_printable_decode(new_buf, |
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280 ctx->encoding_size + skip, |
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281 &pos, ctx->buf); |
5422 | 282 i_assert(pos >= ctx->encoding_size); |
4885 | 283 skip = pos - ctx->encoding_size; |
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284 } |
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285 |
4885 | 286 quoted_printable_decode(input->data + skip, input->size - skip, |
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287 &pos, ctx->buf); |
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288 pos += skip; |
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289 data = ctx->buf->data; |
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290 size = ctx->buf->used; |
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291 break; |
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292 case CONTENT_TYPE_BASE64: |
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293 buffer_set_used_size(ctx->buf, 0); |
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294 if (ctx->encoding_size != 0) { |
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295 if (base64_decode(new_buf, ctx->encoding_size + skip, |
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296 &pos, ctx->buf) < 0) { |
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297 /* corrupted base64 data, don't bother with |
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298 the rest of it */ |
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299 return FALSE; |
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300 } |
5422 | 301 i_assert(pos >= ctx->encoding_size); |
4885 | 302 skip = pos - ctx->encoding_size; |
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303 } |
5510 | 304 ret = base64_decode(input->data + skip, input->size - skip, |
305 &pos, ctx->buf); | |
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 */ |
313 pos = input->size - skip; | |
314 } | |
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315 pos += skip; |
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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 (pos != input->size) { |
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322 /* @UNSAFE */ |
4885 | 323 i_assert(pos < input->size); |
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324 ctx->encoding_size = input->size - pos; |
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325 i_assert(ctx->encoding_size <= sizeof(ctx->encoding_buf)); |
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326 memcpy(ctx->encoding_buf, input->data + pos, |
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327 ctx->encoding_size); |
5422 | 328 } else { |
329 ctx->encoding_size = 0; | |
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330 } |
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331 |
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332 if (ctx->charset_utf8) { |
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333 if (ctx->ucase) { |
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334 buffer_set_used_size(ctx->buf2, 0); |
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335 charset_utf8_ucase_write(ctx->buf2, 0, data, size); |
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336 output->data = ctx->buf2->data; |
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337 output->size = ctx->buf2->used; |
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338 } else { |
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339 output->data = data; |
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340 output->size = size; |
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341 } |
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342 } else if (ctx->charset_trans == NULL) { |
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343 output->data = data; |
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344 output->size = size; |
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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_full(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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Timo Sirainen <tss@iki.fi>
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369 struct message_block *input, |
61e0fe257a83
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Timo Sirainen <tss@iki.fi>
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370 struct message_block *output) |
61e0fe257a83
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Timo Sirainen <tss@iki.fi>
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371 { |
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Timo Sirainen <tss@iki.fi>
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372 if (input->part != ctx->prev_part) { |
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Timo Sirainen <tss@iki.fi>
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373 /* MIME part changed. */ |
61e0fe257a83
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374 i_free_and_null(ctx->content_charset); |
61e0fe257a83
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Timo Sirainen <tss@iki.fi>
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375 ctx->content_type = CONTENT_TYPE_BINARY; |
61e0fe257a83
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376 ctx->charset_utf8 = TRUE; |
4885 | 377 ctx->encoding_size = 0; |
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378 } |
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Timo Sirainen <tss@iki.fi>
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379 |
61e0fe257a83
Added message-decoder to decode message's contents into readable UTF-8.
Timo Sirainen <tss@iki.fi>
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380 output->part = input->part; |
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Don't try to access output variable's contents. They are undefined at least
Timo Sirainen <tss@iki.fi>
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381 ctx->prev_part = input->part; |
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Timo Sirainen <tss@iki.fi>
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382 |
61e0fe257a83
Added message-decoder to decode message's contents into readable UTF-8.
Timo Sirainen <tss@iki.fi>
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383 if (input->hdr != NULL) |
61e0fe257a83
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Timo Sirainen <tss@iki.fi>
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384 return message_decode_header(ctx, input->hdr, output); |
61e0fe257a83
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Timo Sirainen <tss@iki.fi>
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385 else |
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386 return message_decode_body(ctx, input, output); |
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Timo Sirainen <tss@iki.fi>
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387 } |