add endian swap funcs to platform.h
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@ -6,6 +6,8 @@
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#ifndef OCTA_PLATFORM_H
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#define OCTA_PLATFORM_H
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#include <stdint.h>
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#if defined(WIN32) || defined(_WIN32) || (defined(__WIN32) && !defined(__CYGWIN__))
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# define OCTA_PLATFORM_WIN32 1
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# if defined(WIN64) || defined(_WIN64)
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@ -69,4 +71,50 @@
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# endif
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#endif
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namespace octa {
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#if defined(OCTA_TOOLCHAIN_GNU)
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/* using gcc/clang builtins */
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static inline uint16_t endian_swap16(uint16_t x) {
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return __builtin_bswap16(x);
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}
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static inline uint32_t endian_swap32(uint32_t x) {
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return __builtin_bswap32(x);
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}
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static inline uint64_t endian_swap64(uint64_t x) {
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return __builtin_bswap64(x);
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}
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#elif defined(OCTA_TOOLCHAIN_MSVC)
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/* using msvc builtins */
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static inline uint16_t endian_swap16(uint16_t x) {
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return _byteswap_ushort(x);
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}
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static inline uint32_t endian_swap32(uint32_t x) {
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/* win64 is llp64 */
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return _byteswap_ulong(x);
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}
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static inline uint64_t endian_swap64(uint64_t x) {
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return _byteswap_uint64(x);
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}
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#else
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/* fallback */
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static inline uint16_t endian_swap16(uint16_t x) {
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return (x << 8) | (x >> 8);
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}
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static inline uint32_t endian_swap32(uint32_t x) {
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return (x << 24) | (x >> 24) | ((x >> 8) & 0xFF00) | ((x << 8) & 0xFF0000);
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}
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static inline uint64_t endian_swap64(uint64_t x) {
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return endian_swap32(uint32_t(x >> 32)) | (uint64_t(endian_swap32(uint32_t(x))) << 32);
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}
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#endif
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}
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#endif
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