[stgt] [PATCH] add be_byteshift.h taken from linux kernel

[FUJITA Tomonori]

We have too many lines like this:

off = (uint32_t)scb[2] << 24 | (uint32_t)scb[3] << 16 |
	(uint32_t)scb[4] << 8 | (uint32_t)scb[5];

I stole useful functions from linux kernel.

=
From: FUJITA Tomonori <fujita.tomonori at lab.ntt.co.jp>
Subject: [PATCH] add be_byteshift.h taken from linux kernel

Signed-off-by: FUJITA Tomonori <fujita.tomonori at lab.ntt.co.jp>
---
 usr/be_byteshift.h |   68 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 usr/util.h         |    1 +
 2 files changed, 69 insertions(+), 0 deletions(-)
 create mode 100644 usr/be_byteshift.h

diff --git a/usr/be_byteshift.h b/usr/be_byteshift.h
new file mode 100644
index 0000000..5c6a619
--- /dev/null
+++ b/usr/be_byteshift.h
@@ -0,0 +1,68 @@
+#ifndef _LINUX_UNALIGNED_BE_BYTESHIFT_H
+#define _LINUX_UNALIGNED_BE_BYTESHIFT_H
+
+static inline uint16_t __get_unaligned_be16(const uint8_t *p)
+{
+	return p[0] << 8 | p[1];
+}
+
+static inline uint32_t __get_unaligned_be32(const uint8_t *p)
+{
+	return p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
+}
+
+static inline uint64_t __get_unaligned_be64(const uint8_t *p)
+{
+	return (uint64_t)__get_unaligned_be32(p) << 32 |
+	       __get_unaligned_be32(p + 4);
+}
+
+static inline void __put_unaligned_be16(uint16_t val, uint8_t *p)
+{
+	*p++ = val >> 8;
+	*p++ = val;
+}
+
+static inline void __put_unaligned_be32(uint32_t val, uint8_t *p)
+{
+	__put_unaligned_be16(val >> 16, p);
+	__put_unaligned_be16(val, p + 2);
+}
+
+static inline void __put_unaligned_be64(uint64_t val, uint8_t *p)
+{
+	__put_unaligned_be32(val >> 32, p);
+	__put_unaligned_be32(val, p + 4);
+}
+
+static inline uint16_t get_unaligned_be16(const void *p)
+{
+	return __get_unaligned_be16((const uint8_t *)p);
+}
+
+static inline uint32_t get_unaligned_be32(const void *p)
+{
+	return __get_unaligned_be32((const uint8_t *)p);
+}
+
+static inline uint64_t get_unaligned_be64(const void *p)
+{
+	return __get_unaligned_be64((const uint8_t *)p);
+}
+
+static inline void put_unaligned_be16(uint16_t val, void *p)
+{
+	__put_unaligned_be16(val, p);
+}
+
+static inline void put_unaligned_be32(uint32_t val, void *p)
+{
+	__put_unaligned_be32(val, p);
+}
+
+static inline void put_unaligned_be64(uint64_t val, void *p)
+{
+	__put_unaligned_be64(val, p);
+}
+
+#endif /* _LINUX_UNALIGNED_BE_BYTESHIFT_H */
diff --git a/usr/util.h b/usr/util.h
index ac4b380..794c70b 100644
--- a/usr/util.h
+++ b/usr/util.h
@@ -6,6 +6,7 @@
 #include <unistd.h>
 #include <errno.h>
 #include <endian.h>
+#include "be_byteshift.h"
 
 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-- 
1.5.5.GIT

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