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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 22:20:36 (GMT)
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 22:20:36 (GMT)
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/jffs2/pushpull.h
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/jffs2/pushpull.h')
-rw-r--r--fs/jffs2/pushpull.h72
1 files changed, 72 insertions, 0 deletions
diff --git a/fs/jffs2/pushpull.h b/fs/jffs2/pushpull.h
new file mode 100644
index 0000000..c0c2a91
--- /dev/null
+++ b/fs/jffs2/pushpull.h
@@ -0,0 +1,72 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright (C) 2001, 2002 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@infradead.org>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ * $Id: pushpull.h,v 1.10 2004/11/16 20:36:11 dwmw2 Exp $
+ *
+ */
+
+#ifndef __PUSHPULL_H__
+#define __PUSHPULL_H__
+
+#include <linux/errno.h>
+
+struct pushpull {
+ unsigned char *buf;
+ unsigned int buflen;
+ unsigned int ofs;
+ unsigned int reserve;
+};
+
+
+static inline 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;
+}
+
+static inline 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;
+}
+
+static inline int pushedbits(struct pushpull *pp)
+{
+ return pp->ofs;
+}
+
+static inline int pullbit(struct pushpull *pp)
+{
+ int bit;
+
+ bit = (pp->buf[pp->ofs >> 3] >> (7-(pp->ofs & 7))) & 1;
+
+ pp->ofs++;
+ return bit;
+}
+
+static inline int pulledbits(struct pushpull *pp)
+{
+ return pp->ofs;
+}
+
+#endif /* __PUSHPULL_H__ */