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add endian swap funcs to platform.h

master
Daniel Kolesa 2015-06-27 02:05:25 +01:00
parent 715a608b3a
commit da0019dc09
1 changed files with 48 additions and 0 deletions
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48
octa/platform.h
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@ -6,6 +6,8 @@
#ifndef OCTA_PLATFORM_H
#define OCTA_PLATFORM_H
#include <stdint.h>
#if defined(WIN32) || defined(_WIN32) || (defined(__WIN32) && !defined(__CYGWIN__))
# define OCTA_PLATFORM_WIN32 1
# if defined(WIN64) || defined(_WIN64)
@ -69,4 +71,50 @@
# endif
#endif
namespace octa {
#if defined(OCTA_TOOLCHAIN_GNU)
/* using gcc/clang builtins */
static inline uint16_t endian_swap16(uint16_t x) {
return __builtin_bswap16(x);
}
static inline uint32_t endian_swap32(uint32_t x) {
return __builtin_bswap32(x);
}
static inline uint64_t endian_swap64(uint64_t x) {
return __builtin_bswap64(x);
}
#elif defined(OCTA_TOOLCHAIN_MSVC)
/* using msvc builtins */
static inline uint16_t endian_swap16(uint16_t x) {
return _byteswap_ushort(x);
}
static inline uint32_t endian_swap32(uint32_t x) {
/* win64 is llp64 */
return _byteswap_ulong(x);
}
static inline uint64_t endian_swap64(uint64_t x) {
return _byteswap_uint64(x);
}
#else
/* fallback */
static inline uint16_t endian_swap16(uint16_t x) {
return (x << 8) | (x >> 8);
}
static inline uint32_t endian_swap32(uint32_t x) {
return (x << 24) | (x >> 24) | ((x >> 8) & 0xFF00) | ((x << 8) & 0xFF0000);
}
static inline uint64_t endian_swap64(uint64_t x) {
return endian_swap32(uint32_t(x >> 32)) | (uint64_t(endian_swap32(uint32_t(x))) << 32);
}
#endif
}
#endif