From 7f034e980de9192d0c7e163de934f19d2f7d3277 Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Mon, 16 Nov 2015 13:07:12 +0100 Subject: basic: add unaligned macros for little endian Also add test code for that. --- src/basic/unaligned.h | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) (limited to 'src/basic') diff --git a/src/basic/unaligned.h b/src/basic/unaligned.h index d6181dd9a9..a8115eaa1f 100644 --- a/src/basic/unaligned.h +++ b/src/basic/unaligned.h @@ -21,8 +21,11 @@ along with systemd; If not, see . ***/ +#include #include +/* BE */ + static inline uint16_t unaligned_read_be16(const void *_u) { const uint8_t *u = _u; @@ -64,3 +67,47 @@ static inline void unaligned_write_be64(void *_u, uint64_t a) { unaligned_write_be32(u, (uint32_t) (a >> 32)); unaligned_write_be32(u + 4, (uint32_t) a); } + +/* LE */ + +static inline uint16_t unaligned_read_le16(const void *_u) { + const uint8_t *u = _u; + + return (((uint16_t) u[1]) << 8) | + ((uint16_t) u[0]); +} + +static inline uint32_t unaligned_read_le32(const void *_u) { + const uint8_t *u = _u; + + return (((uint32_t) unaligned_read_le16(u + 2)) << 16) | + ((uint32_t) unaligned_read_le16(u)); +} + +static inline uint64_t unaligned_read_le64(const void *_u) { + const uint8_t *u = _u; + + return (((uint64_t) unaligned_read_le32(u + 4)) << 32) | + ((uint64_t) unaligned_read_le32(u)); +} + +static inline void unaligned_write_le16(void *_u, uint16_t a) { + uint8_t *u = _u; + + u[0] = (uint8_t) a; + u[1] = (uint8_t) (a >> 8); +} + +static inline void unaligned_write_le32(void *_u, uint32_t a) { + uint8_t *u = _u; + + unaligned_write_le16(u, (uint16_t) a); + unaligned_write_le16(u + 2, (uint16_t) (a >> 16)); +} + +static inline void unaligned_write_le64(void *_u, uint64_t a) { + uint8_t *u = _u; + + unaligned_write_le32(u, (uint32_t) a); + unaligned_write_le32(u + 4, (uint32_t) (a >> 32)); +} -- cgit v1.2.3-54-g00ecf