diff options
| author | Harald Welte <laforge@gnumonks.org> | 2017-05-15 12:07:51 +0200 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2017-05-15 13:42:00 +0200 |
| commit | 3318c657dea52c143842dab0e0f7733288f7bd4d (patch) | |
| tree | ef025d5907529f7d4f4614e6d110e54b9ca0e045 /include | |
| parent | 054667fe15434e7e467311c7213b50f849aecc79 (diff) | |
introduce byteswap.h with osmo_{htonl,ntohl,htons,ntohs}
We need to have an architecture-independend way of endian conversion /
byte swapping functions which will also work on embedded (bare iron)
builds. Let's introduce osmocom/core/bytesawp.h for this purpose.
Change-Id: Ibc0cc1e36d4ed63a35cf8ceff3af0f26e5ac7a3d
Diffstat (limited to 'include')
| -rw-r--r-- | include/Makefile.am | 1 | ||||
| -rw-r--r-- | include/osmocom/core/byteswap.h | 43 |
2 files changed, 44 insertions, 0 deletions
diff --git a/include/Makefile.am b/include/Makefile.am index 0383d7ad..6981c379 100644 --- a/include/Makefile.am +++ b/include/Makefile.am @@ -10,6 +10,7 @@ nobase_include_HEADERS = \ osmocom/core/bits.h \ osmocom/core/bitvec.h \ osmocom/core/bitcomp.h \ + osmocom/core/byteswap.h \ osmocom/core/conv.h \ osmocom/core/crc16.h \ osmocom/core/crc16gen.h \ diff --git a/include/osmocom/core/byteswap.h b/include/osmocom/core/byteswap.h new file mode 100644 index 00000000..1f09c2b1 --- /dev/null +++ b/include/osmocom/core/byteswap.h @@ -0,0 +1,43 @@ +#pragma once +#include <stdint.h> +#include <osmocom/core/endian.h> + +/*! \brief byte-swap a 32bit word + * \param[in] in to be swapped 32bit word + * \returns byte-swapped 32bit word */ +static inline uint32_t osmo_swab32(uint32_t in) +{ + uint32_t out; + + out = (in & 0xff) << 24; + out |= (in & 0xff00) << 8; + out |= (in & 0xff0000) >> 8; + out |= (in & 0xff000000) >> 24; + + return out; +} + +/*! \brief byte-swap a 16bit word + * \param[in] in to be swapped 16bit word + * \returns byte-swapped 16bit word */ +static inline uint16_t osmo_swab16(uint16_t in) +{ + uint16_t out; + + out = (in & 0xff) << 8; + out |= (in & 0xff00) >> 8; + + return out; +} + +#ifdef OSMO_IS_LITTLE_ENDIAN +#define osmo_ntohl(x) osmo_swab32(x) +#define osmo_ntohs(x) osmo_swab16(x) +#define osmo_htonl(x) osmo_swab32(x) +#define osmo_htons(x) osmo_swab16(x) +#else +#define osmo_ntohl(x) (x) +#define osmo_ntohs(x) (x) +#define osmo_htonl(x) (x) +#define osmo_htons(x) (x) +#endif |