Mercurial > dovecot > core-2.2
annotate src/lib-mail/message-decoder.c @ 5422:01c63c0adc3b HEAD
fixes
author | Timo Sirainen <tss@iki.fi> |
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date | Mon, 26 Mar 2007 02:45:49 +0300 |
parents | 73032525bca0 |
children | 93e9e081855a |
rev | line source |
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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 "strescape.h" |
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6 #include "base64.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 "message-parser.h" |
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10 #include "message-content-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 charset_utf8:1; |
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45 }; |
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46 |
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47 struct message_decoder_context *message_decoder_init(void) |
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48 { |
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49 struct message_decoder_context *ctx; |
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50 |
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51 ctx = i_new(struct message_decoder_context, 1); |
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52 ctx->buf = buffer_create_dynamic(default_pool, 8192); |
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53 ctx->buf2 = buffer_create_dynamic(default_pool, 8192); |
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54 return ctx; |
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55 } |
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56 |
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57 void message_decoder_deinit(struct message_decoder_context **_ctx) |
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58 { |
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59 struct message_decoder_context *ctx = *_ctx; |
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60 |
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61 *_ctx = NULL; |
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62 |
4888 | 63 if (ctx->charset_trans != NULL) |
64 charset_to_utf8_end(&ctx->charset_trans); | |
65 | |
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66 buffer_free(ctx->buf); |
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67 buffer_free(ctx->buf2); |
4888 | 68 i_free(ctx->content_charset); |
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69 i_free(ctx); |
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70 } |
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71 |
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72 static bool |
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73 message_decode_header_callback(const unsigned char *data, size_t size, |
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74 const char *charset, void *context) |
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75 { |
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76 struct message_decoder_context *ctx = context; |
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77 struct charset_translation *t; |
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78 bool unknown_charset; |
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79 |
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80 if (charset == NULL || strcasecmp(charset, "UTF-8") == 0) { |
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81 /* ASCII */ |
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82 buffer_append(ctx->buf, data, size); |
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83 return TRUE; |
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84 } |
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85 |
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86 t = charset_to_utf8_begin(charset, &unknown_charset); |
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87 if (unknown_charset) { |
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88 /* let's just ignore this part */ |
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89 return TRUE; |
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90 } |
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91 |
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92 /* ignore any errors */ |
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93 (void)charset_to_ucase_utf8_full(t, data, &size, ctx->buf); |
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94 charset_to_utf8_end(&t); |
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95 return TRUE; |
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96 } |
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97 |
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98 static void parse_content_encoding(const unsigned char *value, size_t value_len, |
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99 void *context) |
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100 { |
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101 struct message_decoder_context *ctx = context; |
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102 |
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103 ctx->content_type = CONTENT_TYPE_UNKNOWN; |
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104 |
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105 switch (value_len) { |
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106 case 4: |
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107 if (memcasecmp(value, "7bit", 4) == 0 || |
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108 memcasecmp(value, "8bit", 4) == 0) |
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109 ctx->content_type = CONTENT_TYPE_BINARY; |
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110 break; |
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111 case 6: |
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112 if (memcasecmp(value, "base64", 6) == 0) |
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113 ctx->content_type = CONTENT_TYPE_BASE64; |
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114 else if (memcasecmp(value, "binary", 6) == 0) |
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115 ctx->content_type = CONTENT_TYPE_BINARY; |
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116 break; |
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117 case 16: |
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118 if (memcasecmp(value, "quoted-printable", 16) == 0) |
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119 ctx->content_type = CONTENT_TYPE_QP; |
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120 break; |
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121 } |
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122 } |
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123 |
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124 static void |
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125 parse_content_type_param(const unsigned char *name, size_t name_len, |
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126 const unsigned char *value, size_t value_len, |
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127 bool value_quoted, void *context) |
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128 { |
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129 struct message_decoder_context *ctx = context; |
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130 |
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131 if (name_len == 7 && memcasecmp(name, "charset", 7) == 0 && |
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132 ctx->content_charset == NULL) { |
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133 ctx->content_charset = i_strndup(value, value_len); |
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134 if (value_quoted) str_unescape(ctx->content_charset); |
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135 |
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136 ctx->charset_utf8 = charset_is_utf8(ctx->content_charset); |
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137 } |
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138 } |
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139 |
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140 static bool message_decode_header(struct message_decoder_context *ctx, |
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141 struct message_header_line *hdr, |
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142 struct message_block *output) |
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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 if (hdr->name_len == 12 && |
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150 strcasecmp(hdr->name, "Content-Type") == 0) { |
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151 message_content_parse_header(hdr->full_value, |
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152 hdr->full_value_len, |
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153 null_parse_content_callback, |
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154 parse_content_type_param, ctx); |
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155 } |
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156 if (hdr->name_len == 25 && |
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157 strcasecmp(hdr->name, "Content-Transfer-Encoding") == 0) { |
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158 message_content_parse_header(hdr->full_value, |
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159 hdr->full_value_len, |
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160 parse_content_encoding, |
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161 null_parse_content_param_callback, |
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162 ctx); |
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163 } |
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164 |
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165 buffer_set_used_size(ctx->buf, 0); |
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166 message_header_decode(hdr->full_value, hdr->full_value_len, |
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167 message_decode_header_callback, ctx); |
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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 = ctx->buf->used; |
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172 ctx->hdr.value_len = 0; |
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173 |
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174 output->hdr = &ctx->hdr; |
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175 return TRUE; |
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176 } |
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177 |
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178 static void translation_buf_decode(struct message_decoder_context *ctx, |
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179 const unsigned char **data, size_t *size) |
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180 { |
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181 unsigned char trans_buf[MAX_TRANSLATION_BUF_SIZE+1]; |
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182 size_t pos, skip; |
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183 |
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184 /* @UNSAFE */ |
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185 memcpy(trans_buf, ctx->translation_buf, ctx->translation_size); |
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186 skip = sizeof(trans_buf) - ctx->translation_size; |
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187 if (skip > *size) |
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188 skip = *size; |
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189 memcpy(trans_buf + ctx->translation_size, data, skip); |
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190 |
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191 pos = *size; |
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192 (void)charset_to_ucase_utf8_full(ctx->charset_trans, |
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193 *data, &pos, ctx->buf2); |
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194 |
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195 i_assert(pos > ctx->translation_size); |
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196 skip = (ctx->translation_size + skip) - pos; |
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197 |
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198 i_assert(*size >= skip); |
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199 *data += skip; |
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200 *size -= skip; |
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201 |
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202 ctx->translation_size = 0; |
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203 } |
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204 |
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205 static bool message_decode_body(struct message_decoder_context *ctx, |
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206 struct message_block *input, |
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207 struct message_block *output) |
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208 { |
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209 unsigned char new_buf[MAX_ENCODING_BUF_SIZE+1]; |
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210 const unsigned char *data = NULL; |
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211 size_t pos, size = 0, skip = 0; |
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212 bool unknown_charset; |
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213 |
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214 if (ctx->charset_trans == NULL && !ctx->charset_utf8) { |
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215 ctx->charset_trans = |
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216 charset_to_utf8_begin(ctx->content_charset != NULL ? |
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217 ctx->content_charset : "UTF-8", |
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218 &unknown_charset); |
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219 } |
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220 |
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221 if (ctx->encoding_size != 0) { |
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222 /* @UNSAFE */ |
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223 memcpy(new_buf, ctx->encoding_buf, ctx->encoding_size); |
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224 skip = sizeof(new_buf) - ctx->encoding_size; |
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225 if (skip > input->size) |
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226 skip = input->size; |
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227 memcpy(new_buf + ctx->encoding_size, input->data, skip); |
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228 } |
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229 |
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230 switch (ctx->content_type) { |
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231 case CONTENT_TYPE_UNKNOWN: |
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232 /* just skip this body */ |
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233 return FALSE; |
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234 |
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235 case CONTENT_TYPE_BINARY: |
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236 data = input->data; |
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237 size = pos = input->size; |
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238 break; |
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239 case CONTENT_TYPE_QP: |
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240 buffer_set_used_size(ctx->buf, 0); |
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241 if (ctx->encoding_size != 0) { |
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242 quoted_printable_decode(new_buf, |
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243 ctx->encoding_size + skip, |
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244 &pos, ctx->buf); |
5422 | 245 i_assert(pos >= ctx->encoding_size); |
4885 | 246 skip = pos - ctx->encoding_size; |
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247 } |
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248 |
4885 | 249 quoted_printable_decode(input->data + skip, input->size - skip, |
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250 &pos, ctx->buf); |
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251 pos += skip; |
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252 data = ctx->buf->data; |
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253 size = ctx->buf->used; |
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254 break; |
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255 case CONTENT_TYPE_BASE64: |
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256 buffer_set_used_size(ctx->buf, 0); |
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257 if (ctx->encoding_size != 0) { |
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258 if (base64_decode(new_buf, ctx->encoding_size + skip, |
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259 &pos, ctx->buf) < 0) { |
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260 /* corrupted base64 data, don't bother with |
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261 the rest of it */ |
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262 return FALSE; |
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263 } |
5422 | 264 i_assert(pos >= ctx->encoding_size); |
4885 | 265 skip = pos - ctx->encoding_size; |
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266 } |
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267 if (base64_decode(input->data + skip, input->size - skip, |
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268 &pos, ctx->buf) < 0) { |
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269 /* corrupted base64 data, don't bother with |
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270 the rest of it */ |
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271 return FALSE; |
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272 } |
4885 | 273 if (pos < input->size - skip && pos > 0 && |
274 input->data[pos + skip - 1] == '=') { | |
275 /* end of base64 input */ | |
276 pos = input->size - skip; | |
277 } | |
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278 pos += skip; |
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279 data = ctx->buf->data; |
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280 size = ctx->buf->used; |
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281 break; |
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282 } |
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283 |
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284 if (pos != input->size) { |
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285 /* @UNSAFE */ |
4885 | 286 i_assert(pos < input->size); |
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287 ctx->encoding_size = input->size - pos; |
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288 i_assert(ctx->encoding_size <= sizeof(ctx->encoding_buf)); |
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289 memcpy(ctx->encoding_buf, input->data + pos, |
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290 ctx->encoding_size); |
5422 | 291 } else { |
292 ctx->encoding_size = 0; | |
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293 } |
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294 |
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295 if (ctx->charset_utf8 || ctx->charset_trans == NULL) { |
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296 output->data = data; |
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297 output->size = size; |
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298 } else { |
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299 buffer_set_used_size(ctx->buf2, 0); |
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300 if (ctx->translation_size != 0) |
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301 translation_buf_decode(ctx, &data, &size); |
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302 |
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303 pos = size; |
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304 (void)charset_to_ucase_utf8_full(ctx->charset_trans, |
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305 data, &pos, ctx->buf2); |
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306 if (pos != size) { |
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307 ctx->translation_size = size - pos; |
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308 i_assert(ctx->translation_size <= |
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309 sizeof(ctx->translation_buf)); |
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310 memcpy(ctx->translation_buf, data + pos, |
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311 ctx->translation_size); |
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312 } |
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313 output->data = ctx->buf2->data; |
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314 output->size = ctx->buf2->used; |
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315 } |
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316 |
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317 output->hdr = NULL; |
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318 return TRUE; |
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319 } |
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320 |
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321 bool message_decoder_decode_next_block(struct message_decoder_context *ctx, |
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322 struct message_block *input, |
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323 struct message_block *output) |
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324 { |
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325 if (input->part != ctx->prev_part) { |
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326 /* MIME part changed. */ |
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327 i_free_and_null(ctx->content_charset); |
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328 ctx->content_type = CONTENT_TYPE_BINARY; |
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329 ctx->charset_utf8 = TRUE; |
4885 | 330 ctx->encoding_size = 0; |
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331 } |
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332 |
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333 output->part = input->part; |
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334 ctx->prev_part = input->part; |
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335 |
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336 if (input->hdr != NULL) |
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337 return message_decode_header(ctx, input->hdr, output); |
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338 else |
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339 return message_decode_body(ctx, input, output); |
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340 } |