1 files changed, 133 insertions, 0 deletions
diff --git a/src/unmime.c b/src/unmime.c
new file mode 100644
index 00000000..e7dce098
--- /dev/null
+++ b/src/unmime.c
@@ -0,0 +1,133 @@
+/*
+ * 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';
+}