From 0b3cbf57875fd692e4ba0b336fefa4bee1ed00dc Mon Sep 17 00:00:00 2001
From: Simeon Simeonov
Date: Mon, 26 Feb 2018 11:23:00 +0100
Subject: Initial commit for sylpheed 3.7.0

---
 libsylph/unmime.c | 135 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 libsylph/unmime.c

(limited to 'libsylph/unmime.c')

diff --git a/libsylph/unmime.c b/libsylph/unmime.c
new file mode 100644
index 0000000..34a3d73
--- /dev/null
+++ b/libsylph/unmime.c
@@ -0,0 +1,135 @@
+/*
+ * 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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