Add inline functions {be,le}{16,32,64}{enc,dec}() for encoding decoding

into byte strings of unknown alignment.

1 files changed, 108 insertions, 0 deletions

diff --git a/sys/sys/endian.h b/sys/sys/endian.h
index 027b59d..0458ffd 100644
--- a/sys/sys/endian.h
+++ b/sys/sys/endian.h
@@ -89,4 +89,112 @@ typedef	__uint64_t	uint64_t;
 #define	le64toh(x)	bswap64((x))
 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
 
+/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
+
+static __inline uint16_t
+be16dec(const void *pp)
+{
+	u_char const *p = pp;
+
+	return ((p[0] << 8) | p[1]);
+}
+
+static __inline uint32_t
+be32dec(const void *pp)
+{
+	u_char const *p = pp;
+
+	return ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
+}
+
+static __inline uint64_t
+be64dec(const void *pp)
+{
+	u_char const *p = pp;
+
+	return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
+}
+
+static __inline uint16_t
+le16dec(const void *pp)
+{
+	u_char const *p = pp;
+
+	return ((p[1] << 8) | p[0]);
+}
+
+static __inline uint32_t
+le32dec(const void *pp)
+{
+	u_char const *p = pp;
+
+	return ((p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
+}
+
+static __inline uint64_t
+le64dec(const void *pp)
+{
+	u_char const *p = pp;
+
+	return (((uint64_t)be32dec(p + 4) << 32) | be32dec(p));
+}
+
+static __inline void
+be16enc(void *pp, uint16_t u)
+{
+	u_char *p = pp;
+
+	p[0] = (u >> 8) & 0xff;
+	p[1] = u & 0xff;
+}
+
+static __inline void
+be32enc(void *pp, uint32_t u)
+{
+	u_char *p = pp;
+
+	p[0] = (u >> 24) & 0xff;
+	p[1] = (u >> 16) & 0xff;
+	p[2] = (u >> 8) & 0xff;
+	p[3] = u & 0xff;
+}
+
+static __inline void
+be64enc(void *pp, uint64_t u)
+{
+	u_char *p = pp;
+
+	be32enc(p, u >> 32);
+	be32enc(p + 4, u & 0xffffffff);
+}
+
+static __inline void
+le16enc(void *pp, uint16_t u)
+{
+	u_char *p = pp;
+
+	p[0] = u & 0xff;
+	p[1] = (u >> 8) & 0xff;
+}
+
+static __inline void
+le32enc(void *pp, uint32_t u)
+{
+	u_char *p = pp;
+
+	p[0] = u & 0xff;
+	p[1] = (u >> 8) & 0xff;
+	p[2] = (u >> 16) & 0xff;
+	p[3] = (u >> 24) & 0xff;
+}
+
+static __inline void
+le64enc(void *pp, uint64_t u)
+{
+	u_char *p = pp;
+
+	be32enc(p, u & 0xffffffff);
+	be32enc(p + 4, u >> 32);
+}
+
 #endif	/* _SYS_ENDIAN_H_ */