patch-2.1.112 linux/fs/ufs/swab.h

• Lines: 115
• Date: Sun Jul 26 01:20:22 1998
• Orig file: v2.1.111/linux/fs/ufs/swab.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.111/linux/fs/ufs/swab.h linux/fs/ufs/swab.h
@@ -0,0 +1,114 @@
+/*
+ *  linux/fs/ufs/ufs_swab.h
+ *
+ * Copyright (C) 1997 Francois-Rene Rideau <rideau@ens.fr>
+ * Copyright (C) 1998 Jakub Jelinek <jj@ultra.linux.cz>
+ */
+
+#ifndef _UFS_SWAB_H
+#define _UFS_SWAB_H
+
+/*
+ * Notes:
+ *    HERE WE ASSUME EITHER BIG OR LITTLE ENDIAN UFSes
+ *    in case there are ufs implementations that have strange bytesexes,
+ *    you'll need to modify code here as well as in ufs_super.c and ufs_fs.h
+ *    to support them.
+ */
+
+#include <linux/ufs_fs.h>
+#include <asm/byteorder.h>
+
+/*
+ * These are only valid inside ufs routines,
+ * after swab has been initialized to sb->u.ufs_sb.s_swab
+ */
+#define SWAB16(x) ufs_swab16(swab,x)
+#define SWAB32(x) ufs_swab32(swab,x)
+#define SWAB64(x) ufs_swab64(swab,x)
+
+/*
+ * We often use swabing, when we want to increment/decrement some value, so these
+ * macros might become handy and increase readability. (Daniel)
+ */
+#define INC_SWAB16(x)	x=ufs_swab16_add(swab,x,1)
+#define INC_SWAB32(x)	x=ufs_swab32_add(swab,x,1)
+#define INC_SWAB64(x)	x=ufs_swab64_add(swab,x,1)
+#define DEC_SWAB16(x)	x=ufs_swab16_add(swab,x,-1)
+#define DEC_SWAB32(x)	x=ufs_swab32_add(swab,x,-1)
+#define DEC_SWAB64(x)	x=ufs_swab64_add(swab,x,-1)
+#define ADD_SWAB16(x,y)	x=ufs_swab16_add(swab,x,y)
+#define ADD_SWAB32(x,y)	x=ufs_swab32_add(swab,x,y)
+#define ADD_SWAB64(x,y)	x=ufs_swab64_add(swab,x,y)
+#define SUB_SWAB16(x,y)	x=ufs_swab16_add(swab,x,-(y))
+#define SUB_SWAB32(x,y)	x=ufs_swab32_add(swab,x,-(y))
+#define SUB_SWAB64(x,y)	x=ufs_swab64_add(swab,x,-(y))
+
+#ifndef __PDP_ENDIAN
+extern __inline__ __const__ __u16 ufs_swab16(unsigned swab, __u16 x) {
+	if (swab)
+		return swab16(x);
+	else
+		return x;
+}
+extern __inline__ __const__ __u32 ufs_swab32(unsigned swab, __u32 x) {
+	if (swab)
+		return swab32(x);
+	else
+		return x;
+}
+extern __inline__ __const__ __u64 ufs_swab64(unsigned swab, __u64 x) {
+	if (swab)
+		return swab64(x);
+	else
+		return x;
+}
+extern __inline__ __const__ __u16 ufs_swab16_add(unsigned swab, __u16 x, __u16 y) {
+	if (swab)
+		return swab16(swab16(x)+y);
+	else
+		return x + y;
+}
+extern __inline__ __const__ __u32 ufs_swab32_add(unsigned swab, __u32 x, __u32 y) {
+	if (swab)
+		return swab32(swab32(x)+y);
+	else
+		return x + y;
+}
+extern __inline__ __const__ __u64 ufs_swab64_add(unsigned swab, __u64 x, __u64 y) {
+	if (swab)
+		return swab64(swab64(x)+y);
+	else
+		return x + y;
+}
+#else /* __PDP_ENDIAN */
+extern __inline__ __const__ __u16 ufs_swab16(unsigned swab, __u16 x) {
+	if (swab & UFS_LITTLE_ENDIAN)
+		return le16_to_cpu(x);
+	else
+		return be16_to_cpu(x);
+}
+extern __inline__ __const__ __u32 ufs_swab32(unsigned swab, __u32 x) {
+	if (swab & UFS_LITTLE_ENDIAN)
+		return le32_to_cpu(x);
+	else
+		return be32_to_cpu(x);
+}
+extern __inline__ __const__ __u64 ufs_swab64(unsigned swab, __u64 x) {
+	if (swab & UFS_LITTLE_ENDIAN)
+		return le64_to_cpu(x);
+	else
+		return be64_to_cpu(x);
+}
+extern __inline__ __const__ __u16 ufs_swab16_add(unsigned swab, __u16 x, __u16 y) {
+	return ufs_swab16(swab, ufs_swab16(swab, x) + y);
+}
+extern __inline__ __const__ __u32 ufs_swab32_add(unsigned swab, __u32 x, __u32 y) {
+	return ufs_swab32(swab, ufs_swab32(swab, x) + y);
+}
+extern __inline__ __const__ __u64 ufs_swab64_add(unsigned swab, __u64 x, __u64 y) {
+	return ufs_swab64(swab, ufs_swab64(swab, x) + y);
+}
+#endif /* __PDP_ENDIAN */
+
+#endif /* _UFS_SWAB_H */