[PATCH v7 01/12] bswap: add 64 bit endianness helper get_be64
From: Ben Peart <hidden>
Date: 2017-09-19 19:28:34
Subsystem:
the rest · Maintainer:
Linus Torvalds
Add a new get_be64 macro to enable 64 bit endian conversions on memory that may or may not be aligned. Signed-off-by: Ben Peart <redacted> --- compat/bswap.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/compat/bswap.h b/compat/bswap.h
index 7d063e9e40..6b22c46214 100644
--- a/compat/bswap.h
+++ b/compat/bswap.h@@ -158,7 +158,9 @@ static inline uint64_t git_bswap64(uint64_t x) #define get_be16(p) ntohs(*(unsigned short *)(p)) #define get_be32(p) ntohl(*(unsigned int *)(p)) +#define get_be64(p) ntohll(*(uint64_t *)(p)) #define put_be32(p, v) do { *(unsigned int *)(p) = htonl(v); } while (0) +#define put_be64(p, v) do { *(uint64_t *)(p) = htonll(v); } while (0) #else
@@ -178,6 +180,13 @@ static inline uint32_t get_be32(const void *ptr) (uint32_t)p[3] << 0; } +static inline uint64_t get_be64(const void *ptr) +{ + const unsigned char *p = ptr; + return (uint64_t)get_be32(p[0]) << 32 | + (uint64_t)get_be32(p[4]) << 0; +} + static inline void put_be32(void *ptr, uint32_t value) { unsigned char *p = ptr;
@@ -187,4 +196,17 @@ static inline void put_be32(void *ptr, uint32_t value) p[3] = value >> 0; } +static inline void put_be64(void *ptr, uint64_t value) +{ + unsigned char *p = ptr; + p[0] = value >> 56; + p[1] = value >> 48; + p[2] = value >> 40; + p[3] = value >> 32; + p[4] = value >> 24; + p[5] = value >> 16; + p[6] = value >> 8; + p[7] = value >> 0; +} + #endif
--
2.14.1.windows.1