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bswap: add 64 bit endianness helper get_be64 

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 <benpeart@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ben Peart 2017-09-22 12:35:37 -04:00 committed by Junio C Hamano
parent 6867272d5b
commit b2e39d0067
1 changed files with 22 additions and 0 deletions
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22
compat/bswap.h
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@ -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