[PATCH v8 01/12] bswap: add 64 bit endianness helper get_be64

[Ben Peart]

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 <benpe...@microsoft.com>
---
 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
-- 
2.14.1.549.g6ff7ed0467