Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/lib-mail/message-body-search.c @ 785:d96cbba73a8b HEAD
Don't use Buffers with read-only data, just makes it more difficult without
gaining anything.
author | Timo Sirainen <tss@iki.fi> |
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date | Mon, 16 Dec 2002 05:59:06 +0200 |
parents | 553f050c8313 |
children | 5ac361acb316 |
rev | line source |
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1 /* Copyright (C) 2002 Timo Sirainen */ |
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2 |
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3 #include "lib.h" |
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4 #include "base64.h" |
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5 #include "buffer.h" |
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6 #include "istream.h" |
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7 #include "charset-utf8.h" |
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8 #include "rfc822-tokenize.h" |
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9 #include "quoted-printable.h" |
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10 #include "message-parser.h" |
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11 #include "message-content-parser.h" |
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12 #include "message-header-search.h" |
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13 #include "message-body-search.h" |
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14 |
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15 #define DECODE_BLOCK_SIZE 8192 |
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16 |
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17 typedef struct { |
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18 Pool pool; |
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19 |
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20 const char *key; |
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21 size_t key_len; |
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22 |
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23 const char *charset; |
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24 unsigned int unknown_charset:1; |
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25 unsigned int search_header:1; |
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26 } BodySearchContext; |
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27 |
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28 typedef struct { |
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29 BodySearchContext *body_ctx; |
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30 |
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31 HeaderSearchContext *hdr_search_ctx; |
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32 CharsetTranslation *translation; |
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33 |
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34 Buffer *decode_buf; |
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35 |
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36 size_t *matches; |
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37 ssize_t match_count; |
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38 |
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39 char *content_type; |
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40 char *content_charset; |
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41 |
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42 unsigned int content_qp:1; |
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43 unsigned int content_base64:1; |
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44 unsigned int content_unknown:1; |
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45 unsigned int content_type_text:1; /* text/any or message/any */ |
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46 unsigned int ignore_header:1; |
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47 unsigned int found:1; |
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48 } PartSearchContext; |
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49 |
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50 static void parse_content_type(const Rfc822Token *tokens, int count, |
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51 void *context) |
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52 { |
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53 PartSearchContext *ctx = context; |
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54 |
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55 if (ctx->content_type != NULL && tokens[0].token == 'A') { |
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56 ctx->content_type = |
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57 i_strdup(rfc822_tokens_get_value(tokens, count)); |
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58 ctx->content_type_text = |
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59 strncasecmp(ctx->content_type, "text/", 5) == 0 || |
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60 strncasecmp(ctx->content_type, "message/", 8) == 0; |
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61 } |
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62 } |
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63 |
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64 static void parse_content_type_param(const Rfc822Token *name, |
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65 const Rfc822Token *value, |
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66 int value_count, void *context) |
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67 { |
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68 PartSearchContext *ctx = context; |
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69 |
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70 if (name->len != 7 || strncasecmp(name->ptr, "charset", 7) != 0) |
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71 return; |
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72 |
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73 if (ctx->content_charset == NULL) { |
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74 ctx->content_charset = |
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75 i_strdup(rfc822_tokens_get_value(value, value_count)); |
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76 } |
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77 } |
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78 |
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79 static void parse_content_encoding(const Rfc822Token *tokens, |
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80 int count __attr_unused__, void *context) |
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81 { |
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82 PartSearchContext *ctx = context; |
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83 |
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84 if (tokens[0].token != 'A') |
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85 return; |
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86 |
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87 switch (tokens[0].len) { |
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88 case 4: |
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89 if (strncasecmp(tokens[0].ptr, "7bit", 4) != 0 && |
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90 strncasecmp(tokens[0].ptr, "8bit", 4) != 0) |
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91 ctx->content_unknown = TRUE; |
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92 break; |
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93 case 6: |
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94 if (strncasecmp(tokens[0].ptr, "base64", 6) == 0) |
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95 ctx->content_base64 = TRUE; |
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96 else if (strncasecmp(tokens[0].ptr, "binary", 6) != 0) |
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97 ctx->content_unknown = TRUE; |
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98 break; |
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99 case 16: |
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100 if (strncasecmp(tokens[0].ptr, "quoted-printable", 16) == 0) |
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101 ctx->content_qp = TRUE; |
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102 else |
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103 ctx->content_unknown = TRUE; |
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104 break; |
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105 default: |
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106 ctx->content_unknown = TRUE; |
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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 header_find(MessagePart *part __attr_unused__, |
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112 const char *name, size_t name_len, |
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113 const char *value, size_t value_len, void *context) |
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114 { |
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115 PartSearchContext *ctx = context; |
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116 |
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117 if (ctx->found) |
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118 return; |
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119 |
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120 if (!ctx->ignore_header) { |
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121 ctx->found = message_header_search(value, value_len, |
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122 ctx->hdr_search_ctx); |
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123 } |
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124 |
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125 t_push(); |
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126 |
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127 if (name_len == 12 && strncasecmp(name, "Content-Type", 12) == 0) { |
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128 (void)message_content_parse_header(t_strndup(value, value_len), |
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129 parse_content_type, |
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130 parse_content_type_param, |
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131 ctx); |
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132 } else if (name_len == 25 && |
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133 strncasecmp(name, "Content-Transfer-Encoding", 25) == 0) { |
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134 (void)message_content_parse_header(t_strndup(value, value_len), |
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135 parse_content_encoding, |
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136 NULL, ctx); |
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137 } |
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138 |
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139 t_pop(); |
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140 } |
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141 |
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142 static int message_search_header(PartSearchContext *ctx, IStream *input) |
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143 { |
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144 ctx->hdr_search_ctx = message_header_search_init(data_stack_pool, |
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145 ctx->body_ctx->key, |
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146 ctx->body_ctx->charset, |
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147 NULL); |
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148 |
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149 /* we default to text content-type */ |
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150 ctx->content_type_text = TRUE; |
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151 message_parse_header(NULL, input, NULL, header_find, ctx); |
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152 |
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153 return ctx->found; |
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154 } |
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155 |
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156 static int message_search_decoded_block(PartSearchContext *ctx, Buffer *block) |
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157 { |
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158 const unsigned char *p, *end, *key; |
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159 size_t key_len, block_size; |
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160 ssize_t i; |
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161 |
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162 key = (const unsigned char *) ctx->body_ctx->key; |
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163 key_len = ctx->body_ctx->key_len; |
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164 |
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165 p = buffer_get_data(block, &block_size); |
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166 end = p + block_size; |
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167 for (; p != end; p++) { |
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168 for (i = ctx->match_count-1; i >= 0; i--) { |
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169 if (key[ctx->matches[i]] == *p) { |
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170 if (++ctx->matches[i] == key_len) { |
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171 /* full match */ |
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172 p++; |
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173 return TRUE; |
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174 } |
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175 } else { |
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176 /* non-match */ |
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177 ctx->match_count--; |
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178 if (i != ctx->match_count) { |
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179 memmove(ctx->matches + i, |
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180 ctx->matches + i + 1, |
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181 ctx->match_count - i); |
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182 } |
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183 } |
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184 } |
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185 |
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186 if (*p == key[0]) { |
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187 if (key_len == 1) { |
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188 /* only one character in search key */ |
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189 p++; |
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190 return TRUE; |
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191 } |
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192 |
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193 i_assert((size_t)ctx->match_count < key_len); |
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194 ctx->matches[ctx->match_count++] = 1; |
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195 } |
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196 } |
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197 |
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198 return FALSE; |
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199 } |
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200 |
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201 /* returns 1 = found, 0 = not found, -1 = error in input data */ |
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202 static int message_search_body_block(PartSearchContext *ctx, Buffer *block) |
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203 { |
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204 const unsigned char *inbuf; |
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205 Buffer *outbuf; |
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206 CharsetResult result; |
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207 size_t block_pos, inbuf_size, inbuf_left, ret; |
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208 |
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209 outbuf = buffer_create_static(data_stack_pool, DECODE_BLOCK_SIZE); |
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210 for (block_pos = 0; block_pos < buffer_get_used_size(block); ) { |
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211 if (buffer_get_used_size(ctx->decode_buf) == 0) { |
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212 /* we can use the buffer directly without copying */ |
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213 inbuf = buffer_get_data(block, &inbuf_size); |
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214 inbuf += block_pos; inbuf_size -= block_pos; |
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215 block_pos += buffer_get_used_size(block); |
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216 } else { |
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217 /* some characters already in buffer, ie. last |
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218 conversion contained partial data */ |
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219 block_pos += buffer_append_buf(ctx->decode_buf, |
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220 block, block_pos, |
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221 (size_t)-1); |
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222 |
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223 inbuf = buffer_get_data(ctx->decode_buf, &inbuf_size); |
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224 } |
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225 |
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226 buffer_set_used_size(outbuf, 0); |
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227 inbuf_left = inbuf_size; |
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228 result = charset_to_ucase_utf8(ctx->translation, |
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229 inbuf, &inbuf_size, outbuf); |
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230 inbuf_left -= inbuf_size; |
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231 |
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232 switch (result) { |
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233 case CHARSET_RET_OUTPUT_FULL: |
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234 /* we should have copied the incomplete sequence.. */ |
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235 i_assert(inbuf_left <= block_pos); |
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236 /* fall through */ |
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237 case CHARSET_RET_OK: |
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238 buffer_set_used_size(ctx->decode_buf, 0); |
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239 block_pos -= inbuf_left; |
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240 break; |
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241 case CHARSET_RET_INCOMPLETE_INPUT: |
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242 /* save the partial sequence to buffer */ |
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243 ret = buffer_write(ctx->decode_buf, 0, |
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244 inbuf + inbuf_size, inbuf_left); |
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245 i_assert(ret == inbuf_left); |
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246 |
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247 buffer_set_used_size(ctx->decode_buf, ret); |
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248 break; |
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249 |
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250 case CHARSET_RET_INVALID_INPUT: |
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251 return -1; |
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252 } |
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253 |
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254 if (message_search_decoded_block(ctx, outbuf)) |
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255 return 1; |
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256 } |
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257 |
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258 return 0; |
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259 } |
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260 |
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261 static int message_search_body(PartSearchContext *ctx, IStream *input, |
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262 MessagePart *part) |
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263 { |
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264 const unsigned char *data; |
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265 Buffer *decodebuf; |
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266 size_t data_size, pos; |
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267 uoff_t old_limit; |
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268 ssize_t ret; |
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269 int found; |
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270 |
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271 if (ctx->content_unknown) { |
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272 /* unknown content-encoding-type, ignore */ |
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273 return FALSE; |
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274 } |
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275 |
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276 if (!ctx->content_type_text) { |
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277 /* non-text content, ignore - FIXME: should be configurable? */ |
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278 return FALSE; |
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279 } |
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280 |
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281 ctx->translation = ctx->content_charset == NULL ? NULL : |
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282 charset_to_utf8_begin(ctx->content_charset, NULL); |
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283 if (ctx->translation == NULL) |
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284 ctx->translation = charset_to_utf8_begin("ascii", NULL); |
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285 |
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286 ctx->decode_buf = buffer_create_static(data_stack_pool, 256); |
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287 |
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288 ctx->match_count = 0; |
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289 ctx->matches = t_malloc(sizeof(size_t) * ctx->body_ctx->key_len); |
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290 |
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291 i_stream_skip(input, part->physical_pos + |
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292 part->header_size.physical_size - input->v_offset); |
608
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293 |
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294 old_limit = input->v_limit; |
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295 i_stream_set_read_limit(input, input->v_offset + |
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296 part->body_size.physical_size); |
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297 |
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298 found = FALSE; pos = 0; |
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299 while (i_stream_read_data(input, &data, &data_size, pos) > 0) { |
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300 /* limit the size of t_malloc()s */ |
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301 if (data_size > DECODE_BLOCK_SIZE) |
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302 data_size = DECODE_BLOCK_SIZE; |
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303 pos = data_size; |
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304 |
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305 t_push(); |
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306 if (ctx->content_qp) { |
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307 decodebuf = buffer_create_static_hard(data_stack_pool, |
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308 data_size); |
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309 quoted_printable_decode(data, data_size, |
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310 &data_size, decodebuf); |
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311 } else if (ctx->content_base64) { |
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312 size_t size = MAX_BASE64_DECODED_SIZE(data_size); |
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313 decodebuf = buffer_create_static_hard(data_stack_pool, |
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314 size); |
608
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315 |
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316 if (base64_decode(data, data_size, |
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317 &data_size, decodebuf) < 0) { |
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318 /* corrupted base64 data, don't bother with |
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319 the rest of it */ |
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320 t_pop(); |
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321 break; |
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322 } |
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323 } else { |
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324 decodebuf = buffer_create_const_data(data_stack_pool, |
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325 data, data_size); |
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326 } |
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327 |
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328 ret = message_search_body_block(ctx, decodebuf); |
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329 t_pop(); |
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330 |
608
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331 if (ret != 0) { |
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332 found = ret > 0; |
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333 break; |
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334 } |
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335 |
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336 i_stream_skip(input, data_size); |
608
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337 pos -= data_size; |
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338 } |
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339 |
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340 i_stream_set_read_limit(input, old_limit); |
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341 |
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342 if (ctx->translation != NULL) |
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343 charset_to_utf8_end(ctx->translation); |
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344 return found; |
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345 } |
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346 |
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347 static int message_body_search_init(BodySearchContext *ctx, const char *key, |
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348 const char *charset, int *unknown_charset, |
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349 int search_header) |
608
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350 { |
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351 size_t key_len; |
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352 |
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353 memset(ctx, 0, sizeof(BodySearchContext)); |
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354 |
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355 /* get the key uppercased */ |
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356 key = charset_to_ucase_utf8_string(charset, unknown_charset, |
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357 key, strlen(key), &key_len); |
608
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358 if (key == NULL) |
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359 return FALSE; |
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360 |
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361 ctx->key = key; |
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362 ctx->key_len = key_len; |
608
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|
363 ctx->charset = charset; |
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|
364 ctx->unknown_charset = charset == NULL; |
716
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|
365 ctx->search_header = search_header; |
608
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366 |
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367 i_assert(ctx->key_len <= SSIZE_T_MAX/sizeof(size_t)); |
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368 |
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369 return TRUE; |
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370 } |
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371 |
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372 static int message_body_search_ctx(BodySearchContext *ctx, IStream *input, |
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373 MessagePart *part) |
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374 { |
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375 PartSearchContext part_ctx; |
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376 int found; |
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377 |
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378 found = FALSE; |
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379 while (part != NULL && !found) { |
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380 i_assert(input->v_offset <= part->physical_pos); |
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381 |
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382 i_stream_skip(input, part->physical_pos - input->v_offset); |
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383 |
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384 memset(&part_ctx, 0, sizeof(part_ctx)); |
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385 part_ctx.body_ctx = ctx; |
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386 part_ctx.ignore_header = |
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387 part->parent == NULL && !ctx->search_header; |
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388 |
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389 t_push(); |
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390 |
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391 if (message_search_header(&part_ctx, input)) { |
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392 found = TRUE; |
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393 } else if (part->children != NULL) { |
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394 /* multipart/xxx or message/rfc822 */ |
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395 if (message_body_search_ctx(ctx, input, part->children)) |
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396 found = TRUE; |
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397 } else { |
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398 if (message_search_body(&part_ctx, input, part)) |
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399 found = TRUE; |
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400 } |
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401 |
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402 i_free(part_ctx.content_type); |
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403 i_free(part_ctx.content_charset); |
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404 |
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405 t_pop(); |
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406 |
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407 part = part->next; |
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408 } |
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409 |
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410 return found; |
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411 } |
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412 |
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413 int message_body_search(const char *key, const char *charset, |
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414 int *unknown_charset, IStream *input, |
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415 MessagePart *part, int search_header) |
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416 { |
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417 BodySearchContext ctx; |
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418 |
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419 if (!message_body_search_init(&ctx, key, charset, unknown_charset, |
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420 search_header)) |
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421 return -1; |
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422 |
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423 return message_body_search_ctx(&ctx, input, part); |
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424 } |