patch-2.4.10 linux/fs/jffs2/pushpull.c

• Lines: 89
• Date: Fri Sep 14 14:04:07 2001
• Orig file: v2.4.9/linux/fs/jffs2/pushpull.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.9/linux/fs/jffs2/pushpull.c linux/fs/jffs2/pushpull.c
@@ -0,0 +1,88 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright (C) 2001 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
+ *
+ * The original JFFS, from which the design for JFFS2 was derived,
+ * was designed and implemented by Axis Communications AB.
+ *
+ * The contents of this file are subject to the Red Hat eCos Public
+ * License Version 1.1 (the "Licence"); you may not use this file
+ * except in compliance with the Licence.  You may obtain a copy of
+ * the Licence at http://www.redhat.com/
+ *
+ * Software distributed under the Licence is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing rights and
+ * limitations under the Licence.
+ *
+ * The Original Code is JFFS2 - Journalling Flash File System, version 2
+ *
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU General Public License version 2 (the "GPL"), in
+ * which case the provisions of the GPL are applicable instead of the
+ * above.  If you wish to allow the use of your version of this file
+ * only under the terms of the GPL and not to allow others to use your
+ * version of this file under the RHEPL, indicate your decision by
+ * deleting the provisions above and replace them with the notice and
+ * other provisions required by the GPL.  If you do not delete the
+ * provisions above, a recipient may use your version of this file
+ * under either the RHEPL or the GPL.
+ *
+ * $Id: pushpull.c,v 1.6 2001/03/15 15:38:24 dwmw2 Exp $
+ *
+ */
+
+#include <linux/string.h>
+#include "pushpull.h"
+#include <linux/errno.h>
+
+void init_pushpull(struct pushpull *pp, char *buf, unsigned buflen, unsigned ofs, unsigned reserve)
+{
+	pp->buf = buf;
+	pp->buflen = buflen;
+	pp->ofs = ofs;
+	pp->reserve = reserve;
+}
+     
+
+int pushbit(struct pushpull *pp, int bit, int use_reserved)
+{
+	if (pp->ofs >= pp->buflen - (use_reserved?0:pp->reserve)) {
+		return -ENOSPC;
+	}
+
+	if (bit) {
+		pp->buf[pp->ofs >> 3] |= (1<<(7-(pp->ofs &7)));
+	}
+	else {
+		pp->buf[pp->ofs >> 3] &= ~(1<<(7-(pp->ofs &7)));
+	}
+	pp->ofs++;
+
+	return 0;
+}
+
+int pushedbits(struct pushpull *pp)
+{
+	return pp->ofs;
+}
+	
+
+int pullbit(struct pushpull *pp)
+{
+	int bit;
+
+	bit = (pp->buf[pp->ofs >> 3] >> (7-(pp->ofs & 7))) & 1;
+
+	pp->ofs++;
+	return bit;
+}
+
+int pulledbits (struct pushpull *pp)
+{
+	return pp->ofs;
+}
+