2 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
3 * Copyright (C) 1999-2012 Hiroyuki Yamamoto and the Claws Mail team
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
30 #include "quoted-printable.h"
32 #define ENCODED_WORD_BEGIN "=?"
33 #define ENCODED_WORD_END "?="
35 /* Decodes headers based on RFC2045 and RFC2047. */
37 gchar *unmime_header(const gchar *encoded_str, gboolean addr_field)
39 const gchar *p = encoded_str;
40 const gchar *eword_begin_p, *encoding_begin_p, *text_begin_p,
50 outbuf = g_string_sized_new(strlen(encoded_str) * 2);
53 gchar *decoded_text = NULL;
57 eword_begin_p = strstr(p, ENCODED_WORD_BEGIN);
59 g_string_append(outbuf, p);
64 while ((quote_p = strchr(quote_p, '"')) != NULL) {
65 if (quote_p && quote_p < eword_begin_p) {
66 /* Found a quote before the encoded word. */
70 if (quote_p >= eword_begin_p)
74 encoding_begin_p = strchr(eword_begin_p + 2, '?');
75 if (!encoding_begin_p) {
76 g_string_append(outbuf, p);
79 text_begin_p = strchr(encoding_begin_p + 1, '?');
81 g_string_append(outbuf, p);
84 eword_end_p = strstr(text_begin_p + 1, ENCODED_WORD_END);
86 g_string_append(outbuf, p);
90 if (p == encoded_str) {
91 g_string_append_len(outbuf, p, eword_begin_p - p);
94 /* ignore spaces between encoded words */
97 for (sp = p; sp < eword_begin_p; sp++) {
98 if (!g_ascii_isspace(*sp)) {
100 (outbuf, p, eword_begin_p - p);
107 len = MIN(sizeof(charset) - 1,
108 encoding_begin_p - (eword_begin_p + 2));
109 memcpy(charset, eword_begin_p + 2, len);
111 encoding = g_ascii_toupper(*(encoding_begin_p + 1));
113 if (encoding == 'B') {
114 decoded_text = g_malloc
115 (eword_end_p - (text_begin_p + 1) + 1);
116 len = base64_decode(decoded_text, text_begin_p + 1,
117 eword_end_p - (text_begin_p + 1));
118 decoded_text[len] = '\0';
119 } else if (encoding == 'Q') {
120 decoded_text = g_malloc
121 (eword_end_p - (text_begin_p + 1) + 1);
122 len = qp_decode_q_encoding
123 (decoded_text, text_begin_p + 1,
124 eword_end_p - (text_begin_p + 1));
126 g_string_append_len(outbuf, p, eword_end_p + 2 - p);
131 /* An encoded word MUST not appear within a quoted string,
132 * so quoting that word after decoding should be safe.
133 * We check there are no quotes just to be sure. If there
134 * are, well, the comma won't pose a problem, probably.
136 if (addr_field && strchr(decoded_text, ',') && !in_quote) {
137 gchar *tmp = g_strdup_printf("\"%s\"", decoded_text);
138 g_free(decoded_text);
142 /* convert to UTF-8 */
143 conv_str = conv_codeset_strdup(decoded_text, charset, NULL);
144 if (!conv_str || !g_utf8_validate(conv_str, -1, NULL)) {
146 conv_str = g_malloc(len + 1);
147 conv_utf8todisp(conv_str, len + 1, decoded_text);
149 g_string_append(outbuf, conv_str);
152 g_free(decoded_text);
157 out_str = outbuf->str;
158 out_len = outbuf->len;
159 g_string_free(outbuf, FALSE);
161 return g_realloc(out_str, out_len + 1);