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/*
* LibSylph -- E-Mail client library
* Copyright (C) 1999-2005 Hiroyuki Yamamoto
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <string.h>
#include <ctype.h>
#include "codeconv.h"
#include "base64.h"
#include "quoted-printable.h"
#define ENCODED_WORD_BEGIN "=?"
#define ENCODED_WORD_END "?="
/* Decodes headers based on RFC2045 and RFC2047. */
gchar *unmime_header(const gchar *encoded_str)
{
const gchar *p = encoded_str;
const gchar *eword_begin_p, *encoding_begin_p, *text_begin_p,
*eword_end_p;
gchar charset[32];
gchar encoding;
gchar *conv_str;
GString *outbuf;
gchar *out_str;
gsize out_len;
outbuf = g_string_sized_new(strlen(encoded_str) * 2);
while (*p != '\0') {
gchar *decoded_text = NULL;
gint len;
eword_begin_p = strstr(p, ENCODED_WORD_BEGIN);
if (!eword_begin_p) {
g_string_append(outbuf, p);
break;
}
encoding_begin_p = strchr(eword_begin_p + 2, '?');
if (!encoding_begin_p) {
g_string_append(outbuf, p);
break;
}
text_begin_p = strchr(encoding_begin_p + 1, '?');
if (!text_begin_p) {
g_string_append(outbuf, p);
break;
}
eword_end_p = strstr(text_begin_p + 1, ENCODED_WORD_END);
if (!eword_end_p) {
g_string_append(outbuf, p);
break;
}
if (p == encoded_str) {
g_string_append_len(outbuf, p, eword_begin_p - p);
p = eword_begin_p;
} else {
/* ignore spaces between encoded words */
const gchar *sp;
for (sp = p; sp < eword_begin_p; sp++) {
if (!g_ascii_isspace(*sp)) {
g_string_append_len
(outbuf, p, eword_begin_p - p);
p = eword_begin_p;
break;
}
}
}
len = MIN(sizeof(charset) - 1,
encoding_begin_p - (eword_begin_p + 2));
memcpy(charset, eword_begin_p + 2, len);
charset[len] = '\0';
encoding = g_ascii_toupper(*(encoding_begin_p + 1));
if (encoding == 'B') {
decoded_text = g_malloc
(eword_end_p - (text_begin_p + 1) + 1);
len = base64_decode((guchar *)decoded_text,
text_begin_p + 1,
eword_end_p - (text_begin_p + 1));
decoded_text[len] = '\0';
} else if (encoding == 'Q') {
decoded_text = g_malloc
(eword_end_p - (text_begin_p + 1) + 1);
len = qp_decode_q_encoding
((guchar *)decoded_text, text_begin_p + 1,
eword_end_p - (text_begin_p + 1));
} else {
g_string_append_len(outbuf, p, eword_end_p + 2 - p);
p = eword_end_p + 2;
continue;
}
/* convert to UTF-8 */
conv_str = conv_codeset_strdup(decoded_text, charset, NULL);
if (!conv_str)
conv_str = conv_utf8todisp(decoded_text, NULL);
g_string_append(outbuf, conv_str);
g_free(conv_str);
g_free(decoded_text);
p = eword_end_p + 2;
}
out_str = outbuf->str;
out_len = outbuf->len;
g_string_free(outbuf, FALSE);
return g_realloc(out_str, out_len + 1);
}
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