Mercurial > dovecot > core-2.2
annotate src/lib-mail/message-decoder.c @ 9360:fd3c13b9837b HEAD
Message-decoder: Fixes to handling binary body parts.
author | Timo Sirainen <tss@iki.fi> |
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date | Mon, 25 May 2009 19:44:56 -0400 |
parents | ce612bdafc84 |
children | 4c255c7b6245 |
rev | line source |
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Updated copyright notices to include year 2009.
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1 /* Copyright (c) 2006-2009 Dovecot authors, see the included COPYING file */ |
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2 |
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3 #include "lib.h" |
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4 #include "buffer.h" |
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5 #include "base64.h" |
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6 #include "str.h" |
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7 #include "unichar.h" |
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8 #include "charset-utf8.h" |
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9 #include "quoted-printable.h" |
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10 #include "rfc822-parser.h" |
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11 #include "rfc2231-parser.h" |
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12 #include "message-parser.h" |
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13 #include "message-header-decode.h" |
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14 #include "message-decoder.h" |
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15 |
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16 enum content_type { |
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17 CONTENT_TYPE_UNKNOWN = 0, |
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18 CONTENT_TYPE_BINARY, |
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19 CONTENT_TYPE_QP, |
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20 CONTENT_TYPE_BASE64 |
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21 }; |
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22 |
4885 | 23 /* base64 takes max 4 bytes per character, q-p takes max 3. */ |
24 #define MAX_ENCODING_BUF_SIZE 3 | |
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25 |
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26 /* UTF-8 takes max 5 bytes per character. Not sure about others, but I'd think |
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27 10 is more than enough for everyone.. */ |
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28 #define MAX_TRANSLATION_BUF_SIZE 10 |
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29 |
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30 struct message_decoder_context { |
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31 enum message_decoder_flags flags; |
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32 struct message_part *prev_part; |
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33 |
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34 struct message_header_line hdr; |
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35 buffer_t *buf, *buf2; |
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36 |
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37 char *charset_trans_charset; |
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38 struct charset_translation *charset_trans; |
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39 char translation_buf[MAX_TRANSLATION_BUF_SIZE]; |
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40 unsigned int translation_size; |
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41 |
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42 char encoding_buf[MAX_ENCODING_BUF_SIZE]; |
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43 unsigned int encoding_size; |
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44 |
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45 char *content_charset; |
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46 enum content_type content_type; |
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47 |
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48 unsigned int charset_utf8:1; |
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49 unsigned int binary_input:1; |
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50 }; |
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51 |
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52 struct message_decoder_context * |
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53 message_decoder_init(enum message_decoder_flags flags) |
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54 { |
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55 struct message_decoder_context *ctx; |
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56 |
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57 ctx = i_new(struct message_decoder_context, 1); |
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58 ctx->flags = flags; |
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59 ctx->buf = buffer_create_dynamic(default_pool, 8192); |
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60 ctx->buf2 = buffer_create_dynamic(default_pool, 8192); |
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61 return ctx; |
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62 } |
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63 |
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64 void message_decoder_deinit(struct message_decoder_context **_ctx) |
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65 { |
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66 struct message_decoder_context *ctx = *_ctx; |
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67 |
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68 *_ctx = NULL; |
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69 |
4888 | 70 if (ctx->charset_trans != NULL) |
71 charset_to_utf8_end(&ctx->charset_trans); | |
72 | |
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73 buffer_free(&ctx->buf); |
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74 buffer_free(&ctx->buf2); |
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75 i_free(ctx->charset_trans_charset); |
4888 | 76 i_free(ctx->content_charset); |
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77 i_free(ctx); |
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78 } |
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79 |
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80 static void |
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81 parse_content_transfer_encoding(struct message_decoder_context *ctx, |
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82 struct message_header_line *hdr) |
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83 { |
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84 struct rfc822_parser_context parser; |
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85 string_t *value; |
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86 |
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87 value = t_str_new(64); |
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88 rfc822_parser_init(&parser, hdr->full_value, hdr->full_value_len, NULL); |
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89 |
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90 (void)rfc822_skip_lwsp(&parser); |
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91 (void)rfc822_parse_mime_token(&parser, value); |
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92 |
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93 ctx->content_type = CONTENT_TYPE_UNKNOWN; |
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94 switch (str_len(value)) { |
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95 case 4: |
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96 if (i_memcasecmp(str_data(value), "7bit", 4) == 0 || |
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97 i_memcasecmp(str_data(value), "8bit", 4) == 0) |
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98 ctx->content_type = CONTENT_TYPE_BINARY; |
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99 break; |
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100 case 6: |
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101 if (i_memcasecmp(str_data(value), "base64", 6) == 0) |
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102 ctx->content_type = CONTENT_TYPE_BASE64; |
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103 else if (i_memcasecmp(str_data(value), "binary", 6) == 0) |
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104 ctx->content_type = CONTENT_TYPE_BINARY; |
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105 break; |
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106 case 16: |
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107 if (i_memcasecmp(str_data(value), "quoted-printable", 16) == 0) |
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108 ctx->content_type = CONTENT_TYPE_QP; |
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109 break; |
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110 } |
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111 } |
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112 |
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113 static void |
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114 parse_content_type(struct message_decoder_context *ctx, |
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115 struct message_header_line *hdr) |
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116 { |
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117 struct rfc822_parser_context parser; |
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118 const char *const *results; |
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119 string_t *str; |
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120 |
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121 if (ctx->content_charset != NULL) |
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122 return; |
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123 |
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124 rfc822_parser_init(&parser, hdr->full_value, hdr->full_value_len, NULL); |
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125 (void)rfc822_skip_lwsp(&parser); |
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126 str = t_str_new(64); |
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127 if (rfc822_parse_content_type(&parser, str) <= 0) |
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128 return; |
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129 |
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130 (void)rfc2231_parse(&parser, &results); |
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131 for (; *results != NULL; results += 2) { |
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132 if (strcasecmp(results[0], "charset") == 0) { |
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133 ctx->content_charset = i_strdup(results[1]); |
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134 ctx->charset_utf8 = charset_is_utf8(results[1]); |
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135 break; |
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136 } |
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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 bool dtcase = (ctx->flags & MESSAGE_DECODER_FLAG_DTCASE) != 0; |
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145 size_t value_len; |
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146 |
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147 if (hdr->continues) { |
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148 hdr->use_full_value = TRUE; |
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149 return FALSE; |
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150 } |
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151 |
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152 T_BEGIN { |
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153 if (hdr->name_len == 12 && |
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154 strcasecmp(hdr->name, "Content-Type") == 0) |
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155 parse_content_type(ctx, hdr); |
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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 parse_content_transfer_encoding(ctx, hdr); |
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159 } T_END; |
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160 |
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161 buffer_set_used_size(ctx->buf, 0); |
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162 message_header_decode_utf8(hdr->full_value, hdr->full_value_len, |
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163 ctx->buf, dtcase); |
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164 value_len = ctx->buf->used; |
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165 |
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166 if (dtcase) { |
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167 (void)uni_utf8_to_decomposed_titlecase(hdr->name, hdr->name_len, |
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168 ctx->buf); |
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169 buffer_append_c(ctx->buf, '\0'); |
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170 } |
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171 |
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172 ctx->hdr = *hdr; |
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173 ctx->hdr.full_value = ctx->buf->data; |
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174 ctx->hdr.full_value_len = value_len; |
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175 ctx->hdr.value_len = 0; |
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176 if (dtcase) { |
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177 ctx->hdr.name = CONST_PTR_OFFSET(ctx->buf->data, |
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178 ctx->hdr.full_value_len); |
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179 ctx->hdr.name_len = ctx->buf->used - 1 - value_len; |
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180 } |
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181 |
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182 output->hdr = &ctx->hdr; |
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183 return TRUE; |
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184 } |
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185 |
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186 static void translation_buf_decode(struct message_decoder_context *ctx, |
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187 const unsigned char **data, size_t *size) |
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188 { |
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189 unsigned char trans_buf[MAX_TRANSLATION_BUF_SIZE+1]; |
6832 | 190 unsigned int data_wanted, skip; |
191 size_t trans_size; | |
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192 |
6832 | 193 /* @UNSAFE: move the previously untranslated bytes to trans_buf |
194 and see if we have now enough data to get the next character | |
195 translated */ | |
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196 memcpy(trans_buf, ctx->translation_buf, ctx->translation_size); |
6832 | 197 data_wanted = sizeof(trans_buf) - ctx->translation_size; |
198 if (data_wanted > *size) | |
199 data_wanted = *size; | |
200 memcpy(trans_buf + ctx->translation_size, *data, data_wanted); | |
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201 |
6832 | 202 trans_size = ctx->translation_size + data_wanted; |
203 (void)charset_to_utf8(ctx->charset_trans, trans_buf, | |
204 &trans_size, ctx->buf2); | |
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205 |
6832 | 206 i_assert(trans_size > ctx->translation_size); |
207 skip = trans_size - ctx->translation_size; | |
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208 |
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209 i_assert(*size >= skip); |
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210 *data += skip; |
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211 *size -= skip; |
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212 |
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213 ctx->translation_size = 0; |
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214 } |
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215 |
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216 static void |
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217 message_decode_body_init_charset(struct message_decoder_context *ctx, |
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218 struct message_part *part) |
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219 { |
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220 enum charset_flags flags; |
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221 |
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222 ctx->binary_input = ctx->content_charset == NULL && |
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223 (ctx->flags & MESSAGE_DECODER_FLAG_RETURN_BINARY) != 0 && |
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224 (part->flags & (MESSAGE_PART_FLAG_TEXT | |
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225 MESSAGE_PART_FLAG_MESSAGE_RFC822)) == 0; |
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226 |
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227 if (ctx->charset_utf8 || ctx->binary_input) |
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228 return; |
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229 |
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230 if (ctx->charset_trans != NULL && ctx->content_charset != NULL && |
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231 strcasecmp(ctx->content_charset, ctx->charset_trans_charset) == 0) { |
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232 /* already have the correct translation selected */ |
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233 return; |
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234 } |
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235 |
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236 if (ctx->charset_trans != NULL) |
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237 charset_to_utf8_end(&ctx->charset_trans); |
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238 i_free_and_null(ctx->charset_trans_charset); |
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239 |
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240 flags = (ctx->flags & MESSAGE_DECODER_FLAG_DTCASE) != 0 ? |
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241 CHARSET_FLAG_DECOMP_TITLECASE : 0; |
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242 ctx->charset_trans_charset = i_strdup(ctx->content_charset != NULL ? |
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243 ctx->content_charset : "UTF-8"); |
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244 if (charset_to_utf8_begin(ctx->charset_trans_charset, |
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245 flags, &ctx->charset_trans) < 0) |
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246 ctx->charset_trans = NULL; |
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247 } |
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248 |
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249 static bool message_decode_body(struct message_decoder_context *ctx, |
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250 struct message_block *input, |
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251 struct message_block *output) |
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252 { |
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253 unsigned char new_buf[MAX_ENCODING_BUF_SIZE+1]; |
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254 const unsigned char *data = NULL; |
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255 size_t pos, size = 0, skip = 0; |
5510 | 256 int ret; |
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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->binary_input) { |
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333 output->data = data; |
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334 output->size = size; |
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335 } else if (ctx->charset_utf8) { |
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336 buffer_set_used_size(ctx->buf2, 0); |
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337 if ((ctx->flags & MESSAGE_DECODER_FLAG_DTCASE) != 0) { |
6131
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Use uni_utf8_to_decomposed_titlecase() to have proper case-insensitive UTF-8
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338 (void)uni_utf8_to_decomposed_titlecase(data, size, |
6579 | 339 ctx->buf2); |
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Changed message_decoder_init_ucase() to message_decoder_init(bool ucase)
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340 output->data = ctx->buf2->data; |
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341 output->size = ctx->buf2->used; |
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342 } else if (uni_utf8_get_valid_data(data, size, ctx->buf2)) { |
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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 output->data = ctx->buf2->data; |
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347 output->size = ctx->buf2->used; |
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348 } |
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Some data still wasn't uppercased
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349 } else if (ctx->charset_trans == NULL) { |
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350 /* unknown charset */ |
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351 buffer_set_used_size(ctx->buf2, 0); |
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352 if (uni_utf8_get_valid_data(data, size, ctx->buf2)) { |
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353 output->data = data; |
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354 output->size = size; |
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355 } else { |
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356 output->data = ctx->buf2->data; |
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357 output->size = ctx->buf2->used; |
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358 } |
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359 } else { |
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360 buffer_set_used_size(ctx->buf2, 0); |
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361 if (ctx->translation_size != 0) |
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362 translation_buf_decode(ctx, &data, &size); |
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363 |
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364 pos = size; |
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charset_to_utf8() isn't used anymore, so renamed charset_to_utf8_full() to it.
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365 (void)charset_to_utf8(ctx->charset_trans, |
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366 data, &pos, ctx->buf2); |
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367 if (pos != size) { |
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368 ctx->translation_size = size - pos; |
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369 i_assert(ctx->translation_size <= |
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370 sizeof(ctx->translation_buf)); |
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371 memcpy(ctx->translation_buf, data + pos, |
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372 ctx->translation_size); |
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373 } |
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374 output->data = ctx->buf2->data; |
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375 output->size = ctx->buf2->used; |
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376 } |
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377 |
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378 output->hdr = NULL; |
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379 return TRUE; |
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380 } |
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381 |
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382 bool message_decoder_decode_next_block(struct message_decoder_context *ctx, |
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383 struct message_block *input, |
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384 struct message_block *output) |
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385 { |
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386 if (input->part != ctx->prev_part) { |
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387 /* MIME part changed. */ |
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388 message_decoder_decode_reset(ctx); |
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389 } |
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390 |
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391 output->part = input->part; |
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392 ctx->prev_part = input->part; |
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393 |
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394 if (input->hdr != NULL) |
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395 return message_decode_header(ctx, input->hdr, output); |
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396 else if (input->size != 0) |
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397 return message_decode_body(ctx, input, output); |
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398 else { |
6942 | 399 output->hdr = NULL; |
400 output->size = 0; | |
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401 message_decode_body_init_charset(ctx, input->part); |
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402 return TRUE; |
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403 } |
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404 } |
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405 |
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406 void message_decoder_decode_reset(struct message_decoder_context *ctx) |
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407 { |
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408 i_free_and_null(ctx->content_charset); |
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409 ctx->content_type = CONTENT_TYPE_BINARY; |
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410 ctx->charset_utf8 = TRUE; |
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411 ctx->encoding_size = 0; |
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412 } |