diff options
Diffstat (limited to 'libglusterfs/src/glusterfs/byte-order.h')
| -rw-r--r-- | libglusterfs/src/glusterfs/byte-order.h | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/libglusterfs/src/glusterfs/byte-order.h b/libglusterfs/src/glusterfs/byte-order.h new file mode 100644 index 00000000000..fd8cef9e58d --- /dev/null +++ b/libglusterfs/src/glusterfs/byte-order.h @@ -0,0 +1,279 @@ +/* + Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com> + This file is part of GlusterFS. + + This file is licensed to you under your choice of the GNU Lesser + General Public License, version 3 or any later version (LGPLv3 or + later), or the GNU General Public License, version 2 (GPLv2), in all + cases as published by the Free Software Foundation. +*/ + +#ifndef _BYTE_ORDER_H +#define _BYTE_ORDER_H + +#include <inttypes.h> + +#define LS1 0x00ffU +#define MS1 0xff00U +#define LS2 0x0000ffffU +#define MS2 0xffff0000U +#define LS4 0x00000000ffffffffULL +#define MS4 0xffffffff00000000ULL + +static uint16_t (*hton16)(uint16_t); +static uint32_t (*hton32)(uint32_t); +static uint64_t (*hton64)(uint64_t); + +#define ntoh16 hton16 +#define ntoh32 hton32 +#define ntoh64 hton64 + +static uint16_t (*htole16)(uint16_t); +static uint32_t (*htole32)(uint32_t); +static uint64_t (*htole64)(uint64_t); + +#define letoh16 htole16 +#define letoh32 htole32 +#define letoh64 htole64 + +static uint16_t (*htobe16)(uint16_t); +static uint32_t (*htobe32)(uint32_t); +static uint64_t (*htobe64)(uint64_t); + +#define betoh16 htobe16 +#define betoh32 htobe32 +#define betoh64 htobe64 + +#define do_swap2(x) (((x & LS1) << 8) | (((x & MS1) >> 8))) +#define do_swap4(x) ((do_swap2(x & LS2) << 16) | (do_swap2((x & MS2) >> 16))) +#define do_swap8(x) ((do_swap4(x & LS4) << 32) | (do_swap4((x & MS4) >> 32))) + +static inline uint16_t +__swap16(uint16_t x) +{ + return do_swap2(x); +} + +static inline uint32_t +__swap32(uint32_t x) +{ + return do_swap4(x); +} + +static inline uint64_t +__swap64(uint64_t x) +{ + return do_swap8(x); +} + +static inline uint16_t +__noswap16(uint16_t x) +{ + return x; +} + +static inline uint32_t +__noswap32(uint32_t x) +{ + return x; +} + +static inline uint64_t +__noswap64(uint64_t x) +{ + return x; +} + +static inline uint16_t +__byte_order_n16(uint16_t i) +{ + uint32_t num = 1; + + if (((char *)(&num))[0] == 1) { + /* cpu is le */ + hton16 = __swap16; + hton32 = __swap32; + hton64 = __swap64; + } else { + /* cpu is be */ + hton16 = __noswap16; + hton32 = __noswap32; + hton64 = __noswap64; + } + + return hton16(i); +} + +static inline uint32_t +__byte_order_n32(uint32_t i) +{ + uint32_t num = 1; + + if (((char *)(&num))[0] == 1) { + /* cpu is le */ + hton16 = __swap16; + hton32 = __swap32; + hton64 = __swap64; + } else { + /* cpu is be */ + hton16 = __noswap16; + hton32 = __noswap32; + hton64 = __noswap64; + } + + return hton32(i); +} + +static inline uint64_t +__byte_order_n64(uint64_t i) +{ + uint32_t num = 1; + + if (((char *)(&num))[0] == 1) { + /* cpu is le */ + hton16 = __swap16; + hton32 = __swap32; + hton64 = __swap64; + } else { + /* cpu is be */ + hton16 = __noswap16; + hton32 = __noswap32; + hton64 = __noswap64; + } + + return hton64(i); +} + +static uint16_t (*hton16)(uint16_t) = __byte_order_n16; +static uint32_t (*hton32)(uint32_t) = __byte_order_n32; +static uint64_t (*hton64)(uint64_t) = __byte_order_n64; + +static inline uint16_t +__byte_order_le16(uint16_t i) +{ + uint32_t num = 1; + + if (((char *)(&num))[0] == 1) { + /* cpu is le */ + htole16 = __noswap16; + htole32 = __noswap32; + htole64 = __noswap64; + } else { + /* cpu is be */ + htole16 = __swap16; + htole32 = __swap32; + htole64 = __swap64; + } + + return htole16(i); +} + +static inline uint32_t +__byte_order_le32(uint32_t i) +{ + uint32_t num = 1; + + if (((char *)(&num))[0] == 1) { + /* cpu is le */ + htole16 = __noswap16; + htole32 = __noswap32; + htole64 = __noswap64; + } else { + /* cpu is be */ + htole16 = __swap16; + htole32 = __swap32; + htole64 = __swap64; + } + + return htole32(i); +} + +static inline uint64_t +__byte_order_le64(uint64_t i) +{ + uint32_t num = 1; + + if (((char *)(&num))[0] == 1) { + /* cpu is le */ + htole16 = __noswap16; + htole32 = __noswap32; + htole64 = __noswap64; + } else { + /* cpu is be */ + htole16 = __swap16; + htole32 = __swap32; + htole64 = __swap64; + } + + return htole64(i); +} + +static uint16_t (*htole16)(uint16_t) = __byte_order_le16; +static uint32_t (*htole32)(uint32_t) = __byte_order_le32; +static uint64_t (*htole64)(uint64_t) = __byte_order_le64; + +static inline uint16_t +__byte_order_be16(uint16_t i) +{ + uint32_t num = 1; + + if (((char *)(&num))[0] == 1) { + /* cpu is le */ + htobe16 = __swap16; + htobe32 = __swap32; + htobe64 = __swap64; + } else { + /* cpu is be */ + htobe16 = __noswap16; + htobe32 = __noswap32; + htobe64 = __noswap64; + } + + return htobe16(i); +} + +static inline uint32_t +__byte_order_be32(uint32_t i) +{ + uint32_t num = 1; + + if (((char *)(&num))[0] == 1) { + /* cpu is le */ + htobe16 = __swap16; + htobe32 = __swap32; + htobe64 = __swap64; + } else { + /* cpu is be */ + htobe16 = __noswap16; + htobe32 = __noswap32; + htobe64 = __noswap64; + } + + return htobe32(i); +} + +static inline uint64_t +__byte_order_be64(uint64_t i) +{ + uint32_t num = 1; + + if (((char *)(&num))[0] == 1) { + /* cpu is le */ + htobe16 = __swap16; + htobe32 = __swap32; + htobe64 = __swap64; + } else { + /* cpu is be */ + htobe16 = __noswap16; + htobe32 = __noswap32; + htobe64 = __noswap64; + } + + return htobe64(i); +} + +static uint16_t (*htobe16)(uint16_t) = __byte_order_be16; +static uint32_t (*htobe32)(uint32_t) = __byte_order_be32; +static uint64_t (*htobe64)(uint64_t) = __byte_order_be64; + +#endif /* _BYTE_ORDER_H */ |