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

[Mark Harvey]

XXX_be24 routine would be very useful as well..

Cheers
Mark

On Wed, Aug 27, 2008 at 6:06 PM, FUJITA Tomonori
<fujita.tomonori at lab.ntt.co.jp> wrote:
> 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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