Add a stripsig filter. Fixes bug #52767.

2004-05-13  Jeffrey Stedfast  <fejj@novell.com>

	* em-format-quote.c (emfq_text_plain): Add a stripsig
	filter. Fixes bug #52767.

	* em-stripsig-filter.[c,h]: New filter class to strip
	signatures. Useful when generating forwards/replies.

svn path=/trunk/; revision=25902

1 files changed, 169 insertions, 0 deletions

diff --git a/mail/em-stripsig-filter.c b/mail/em-stripsig-filter.c
new file mode 100644
index 0000000000..d70db037a8
--- /dev/null
+++ b/mail/em-stripsig-filter.c
@@ -0,0 +1,169 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/*
+ *  Authors: Jeffrey Stedfast <fejj@ximian.com>
+ *
+ *  Copyright 2001-2004 Ximian, Inc. (www.ximian.com)
+ *
+ *  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 Street #330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <string.h>
+
+#include "em-stripsig-filter.h"
+
+
+static void em_stripsig_filter_class_init (EMStripSigFilterClass *klass);
+static void em_stripsig_filter_init (EMStripSigFilter *filter, EMStripSigFilterClass *klass);
+
+static void filter_filter (CamelMimeFilter *filter, char *in, size_t len, size_t prespace,
+			   char **out, size_t *outlen, size_t *outprespace);
+static void filter_complete (CamelMimeFilter *filter, char *in, size_t len, size_t prespace,
+			     char **out, size_t *outlen, size_t *outprespace);
+static void filter_reset (CamelMimeFilter *filter);
+
+
+static CamelMimeFilterClass *parent_class = NULL;
+
+
+CamelType
+em_stripsig_filter_get_type (void)
+{
+	static CamelType type = CAMEL_INVALID_TYPE;
+	
+	if (type == CAMEL_INVALID_TYPE) {
+		type = camel_type_register (camel_mime_filter_get_type (),
+					    "EMStripSigFilter",
+					    sizeof (EMStripSigFilter),
+					    sizeof (EMStripSigFilterClass),
+					    (CamelObjectClassInitFunc) em_stripsig_filter_class_init,
+					    NULL,
+					    (CamelObjectInitFunc) em_stripsig_filter_init,
+					    NULL);
+	}
+	
+	return type;
+}
+
+
+static void
+em_stripsig_filter_class_init (EMStripSigFilterClass *klass)
+{
+	CamelMimeFilterClass *filter_class = (CamelMimeFilterClass *) klass;
+	
+	parent_class = CAMEL_MIME_FILTER_CLASS (camel_type_get_global_classfuncs (camel_mime_filter_get_type ()));
+	
+	filter_class->reset = filter_reset;
+	filter_class->filter = filter_filter;
+	filter_class->complete = filter_complete;
+}
+
+static void
+em_stripsig_filter_init (EMStripSigFilter *filter, EMStripSigFilterClass *klass)
+{
+	filter->midline = FALSE;
+}
+
+static void
+strip_signature (CamelMimeFilter *filter, char *in, size_t len, size_t prespace,
+		 char **out, size_t *outlen, size_t *outprespace, int flush)
+{
+	EMStripSigFilter *stripsig = (EMStripSigFilter *) filter;
+	register const char *inptr = in;
+	const char *inend = in + len;
+	const char *start = NULL;
+	
+	if (stripsig->midline) {
+		while (inptr < inend && *inptr != '\n')
+			inptr++;
+		
+		if (inptr < inend) {
+			stripsig->midline = FALSE;
+			inptr++;
+		}
+	}
+	
+	while (inptr < inend) {
+		if ((inend - inptr) >= 4 && !strncmp (inptr, "-- \n", 4)) {
+			start = inptr;
+			inptr += 4;
+		} else {
+			while (inptr < inend && *inptr != '\n')
+				inptr++;
+			
+			if (inptr == inend) {
+				stripsig->midline = TRUE;
+				break;
+			}
+			
+			inptr++;
+		}
+	}
+	
+	if (start != NULL)
+		inptr = start;
+	
+	if (!flush && inend > inptr)
+		camel_mime_filter_backup (filter, inptr, inend - inptr);
+	else if (!start)
+		inptr = inend;
+	
+	*out = in;
+	*outlen = inptr - in;
+	*outprespace = prespace;
+}
+
+static void
+filter_filter (CamelMimeFilter *filter, char *in, size_t len, size_t prespace,
+	       char **out, size_t *outlen, size_t *outprespace)
+{
+	strip_signature (filter, in, len, prespace, out, outlen, outprespace, FALSE);
+}
+
+static void
+filter_complete (CamelMimeFilter *filter, char *in, size_t len, size_t prespace,
+		 char **out, size_t *outlen, size_t *outprespace)
+{
+	strip_signature (filter, in, len, prespace, out, outlen, outprespace, TRUE);
+}
+
+/* should this 'flush' outstanding state/data bytes? */
+static void
+filter_reset (CamelMimeFilter *filter)
+{
+	EMStripSigFilter *stripsig = (EMStripSigFilter *) filter;
+	
+	stripsig->midline = FALSE;
+}
+
+
+/**
+ * em_stripsig_filter_new:
+ *
+ * Creates a new stripsig filter.
+ *
+ * Returns a new stripsig filter.
+ **/
+CamelMimeFilter *
+em_stripsig_filter_new (void)
+{
+	return (CamelMimeFilter *) camel_object_new (EM_TYPE_STRIPSIG_FILTER);
+}