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/*
* Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
* Copyright (C) 1999-2003 Hiroyuki Yamamoto
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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. */
void unmime_header(gchar *out, const gchar *str)
{
const gchar *p = str;
gchar *outp = out;
const gchar *eword_begin_p, *encoding_begin_p, *text_begin_p,
*eword_end_p;
gchar charset[32];
gchar encoding;
gchar *conv_str;
gint len;
while (*p != '\0') {
gchar *decoded_text = NULL;
eword_begin_p = strstr(p, ENCODED_WORD_BEGIN);
if (!eword_begin_p) {
strcpy(outp, p);
return;
}
encoding_begin_p = strchr(eword_begin_p + 2, '?');
if (!encoding_begin_p) {
strcpy(outp, p);
return;
}
text_begin_p = strchr(encoding_begin_p + 1, '?');
if (!text_begin_p) {
strcpy(outp, p);
return;
}
eword_end_p = strstr(text_begin_p + 1, ENCODED_WORD_END);
if (!eword_end_p) {
strcpy(outp, p);
return;
}
if (p == str) {
memcpy(outp, p, eword_begin_p - p);
outp += 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 (!isspace(*(const guchar *)sp)) {
memcpy(outp, p, eword_begin_p - p);
outp += 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 = toupper(*(encoding_begin_p + 1));
if (encoding == 'B') {
decoded_text = g_malloc
(eword_end_p - (text_begin_p + 1) + 1);
len = base64_decode(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
(decoded_text, text_begin_p + 1,
eword_end_p - (text_begin_p + 1));
} else {
memcpy(outp, p, eword_end_p + 2 - p);
outp += eword_end_p + 2 - p;
p = eword_end_p + 2;
continue;
}
/* convert to locale encoding */
conv_str = conv_codeset_strdup(decoded_text, charset, NULL);
if (conv_str) {
len = strlen(conv_str);
memcpy(outp, conv_str, len);
g_free(conv_str);
} else {
len = strlen(decoded_text);
conv_localetodisp(outp, len + 1, decoded_text);
}
outp += len;
g_free(decoded_text);
p = eword_end_p + 2;
}
*outp = '\0';
}
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