[sr-dev] git:master:8805959c: core: add generic byte swap macros

Module: kamailio Branch: master Commit: 8805959c996fce90c34e2f0bc750db172bfda0d8 URL: https://github.com/kamailio/kamailio/commit/8805959c996fce90c34e2f0bc750db1… Author: Spencer Thomason &lt;spencer(a)whiteskycommunications.com&gt; Committer: Spencer Thomason &lt;spencer(a)whiteskycommunications.com&gt; Date: 2016-07-07T01:33:29-07:00 core: add generic byte swap macros - add bswap16() and bswap32() for 16 and 32 bit endianness swap --- Modified: endianness.h --- Diff: https://github.com/kamailio/kamailio/commit/8805959c996fce90c34e2f0bc750db1… Patch: https://github.com/kamailio/kamailio/commit/8805959c996fce90c34e2f0bc750db1… --- diff --git a/endianness.h b/endianness.h index 53f0fba..e6edec2 100644 --- a/endianness.h +++ b/endianness.h @@ -30,6 +30,8 @@ * detected endianness corresponds to * the runtime detected one and -1 on * error (recommended action: bail out) + * - bswap16() - 16 bit byte swap + * - bswap32() - 32 bit byte swap * * Implementation notes: * Endian macro names/tests for different OSes: @@ -130,6 +132,29 @@ extern int endianness_sanity_check(void); #error BUG: both little & big endian detected in the same time #endif +#if defined __IS_LITTLE_ENDIAN +#include <arpa/inet.h> +#define bswap16(x) ntohs(x) +#define bswap32(x) ntohl(x) +#else /* !__IS_LITTLE_ENDIAN */ +#include <stdint.h> +#if defined __GNUC__ && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) +/* need at least GCC 4.8 for __builtin_bswap16 on all archs */ +#define bswap16(x) ((uint16_t)__builtin_bswap16(x)) +#else +#define bswap16(x) (((uint16_t)(x) >> 8) | \ + ((uint16_t)(x) << 8)) +#endif +#if defined __GNUC__ && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) +/* GCC >= 4.3 provides __builtin_bswap32 */ +#define bswap32(x) ((uint32_t)__builtin_bswap32(x)) +#else +#define bswap32(x) (((uint32_t)(x) << 24) | \ + (((uint32_t)(x) << 8) & 0xff0000) | \ + (((uint32_t)(x) >> 8) & 0xff00) | \ + ((uint32_t)(x) >> 24)) +#endif +#endif /* !__IS_LITTLE_ENDIAN */ #endif /* _endianness_h */