/* Copyright (c) INRIA and Microsoft Corporation. All rights reserved. Licensed under the Apache 2.0 License. */ #ifndef __LOWSTAR_ENDIANNESS_H #define __LOWSTAR_ENDIANNESS_H #include #include /******************************************************************************/ /* Implementing C.fst (part 2: endian-ness macros) */ /******************************************************************************/ /* ... for Linux */ #if defined(__linux__) || defined(__CYGWIN__) || defined (__USE_SYSTEM_ENDIAN_H__) || defined(__GLIBC__) # include /* ... for OSX */ #elif defined(__APPLE__) # include # define htole64(x) OSSwapHostToLittleInt64(x) # define le64toh(x) OSSwapLittleToHostInt64(x) # define htobe64(x) OSSwapHostToBigInt64(x) # define be64toh(x) OSSwapBigToHostInt64(x) # define htole16(x) OSSwapHostToLittleInt16(x) # define le16toh(x) OSSwapLittleToHostInt16(x) # define htobe16(x) OSSwapHostToBigInt16(x) # define be16toh(x) OSSwapBigToHostInt16(x) # define htole32(x) OSSwapHostToLittleInt32(x) # define le32toh(x) OSSwapLittleToHostInt32(x) # define htobe32(x) OSSwapHostToBigInt32(x) # define be32toh(x) OSSwapBigToHostInt32(x) /* ... for Solaris */ #elif defined(__sun__) # include # define htole64(x) LE_64(x) # define le64toh(x) LE_64(x) # define htobe64(x) BE_64(x) # define be64toh(x) BE_64(x) # define htole16(x) LE_16(x) # define le16toh(x) LE_16(x) # define htobe16(x) BE_16(x) # define be16toh(x) BE_16(x) # define htole32(x) LE_32(x) # define le32toh(x) LE_32(x) # define htobe32(x) BE_32(x) # define be32toh(x) BE_32(x) /* ... for the BSDs */ #elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__DragonFly__) # include #elif defined(__OpenBSD__) # include /* ... for Windows (MSVC)... not targeting XBOX 360! */ #elif defined(_MSC_VER) # include # define htobe16(x) _byteswap_ushort(x) # define htole16(x) (x) # define be16toh(x) _byteswap_ushort(x) # define le16toh(x) (x) # define htobe32(x) _byteswap_ulong(x) # define htole32(x) (x) # define be32toh(x) _byteswap_ulong(x) # define le32toh(x) (x) # define htobe64(x) _byteswap_uint64(x) # define htole64(x) (x) # define be64toh(x) _byteswap_uint64(x) # define le64toh(x) (x) /* ... for Windows (GCC-like, e.g. mingw or clang) */ #elif (defined(_WIN32) || defined(_WIN64)) && \ (defined(__GNUC__) || defined(__clang__)) # define htobe16(x) __builtin_bswap16(x) # define htole16(x) (x) # define be16toh(x) __builtin_bswap16(x) # define le16toh(x) (x) # define htobe32(x) __builtin_bswap32(x) # define htole32(x) (x) # define be32toh(x) __builtin_bswap32(x) # define le32toh(x) (x) # define htobe64(x) __builtin_bswap64(x) # define htole64(x) (x) # define be64toh(x) __builtin_bswap64(x) # define le64toh(x) (x) /* ... generic big-endian fallback code */ #elif defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ /* byte swapping code inspired by: * https://github.com/rweather/arduinolibs/blob/master/libraries/Crypto/utility/EndianUtil.h * */ # define htobe32(x) (x) # define be32toh(x) (x) # define htole32(x) \ (__extension__({ \ uint32_t _temp = (x); \ ((_temp >> 24) & 0x000000FF) | ((_temp >> 8) & 0x0000FF00) | \ ((_temp << 8) & 0x00FF0000) | ((_temp << 24) & 0xFF000000); \ })) # define le32toh(x) (htole32((x))) # define htobe64(x) (x) # define be64toh(x) (x) # define htole64(x) \ (__extension__({ \ uint64_t __temp = (x); \ uint32_t __low = htobe32((uint32_t)__temp); \ uint32_t __high = htobe32((uint32_t)(__temp >> 32)); \ (((uint64_t)__low) << 32) | __high; \ })) # define le64toh(x) (htole64((x))) /* ... generic little-endian fallback code */ #elif defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ # define htole32(x) (x) # define le32toh(x) (x) # define htobe32(x) \ (__extension__({ \ uint32_t _temp = (x); \ ((_temp >> 24) & 0x000000FF) | ((_temp >> 8) & 0x0000FF00) | \ ((_temp << 8) & 0x00FF0000) | ((_temp << 24) & 0xFF000000); \ })) # define be32toh(x) (htobe32((x))) # define htole64(x) (x) # define le64toh(x) (x) # define htobe64(x) \ (__extension__({ \ uint64_t __temp = (x); \ uint32_t __low = htobe32((uint32_t)__temp); \ uint32_t __high = htobe32((uint32_t)(__temp >> 32)); \ (((uint64_t)__low) << 32) | __high; \ })) # define be64toh(x) (htobe64((x))) /* ... couldn't determine endian-ness of the target platform */ #else # error "Please define __BYTE_ORDER__!" #endif /* defined(__linux__) || ... */ /* Loads and stores. These avoid undefined behavior due to unaligned memory * accesses, via memcpy. */ inline static uint16_t load16(uint8_t *b) { uint16_t x; memcpy(&x, b, 2); return x; } inline static uint32_t load32(uint8_t *b) { uint32_t x; memcpy(&x, b, 4); return x; } inline static uint64_t load64(uint8_t *b) { uint64_t x; memcpy(&x, b, 8); return x; } inline static void store16(uint8_t *b, uint16_t i) { memcpy(b, &i, 2); } inline static void store32(uint8_t *b, uint32_t i) { memcpy(b, &i, 4); } inline static void store64(uint8_t *b, uint64_t i) { memcpy(b, &i, 8); } /* Legacy accessors so that this header can serve as an implementation of * C.Endianness */ #define load16_le(b) (le16toh(load16(b))) #define store16_le(b, i) (store16(b, htole16(i))) #define load16_be(b) (be16toh(load16(b))) #define store16_be(b, i) (store16(b, htobe16(i))) #define load32_le(b) (le32toh(load32(b))) #define store32_le(b, i) (store32(b, htole32(i))) #define load32_be(b) (be32toh(load32(b))) #define store32_be(b, i) (store32(b, htobe32(i))) #define load64_le(b) (le64toh(load64(b))) #define store64_le(b, i) (store64(b, htole64(i))) #define load64_be(b) (be64toh(load64(b))) #define store64_be(b, i) (store64(b, htobe64(i))) /* Co-existence of LowStar.Endianness and FStar.Endianness generates name * conflicts, because of course both insist on having no prefixes. Until a * prefix is added, or until we truly retire FStar.Endianness, solve this issue * in an elegant way. */ #define load16_le0 load16_le #define store16_le0 store16_le #define load16_be0 load16_be #define store16_be0 store16_be #define load32_le0 load32_le #define store32_le0 store32_le #define load32_be0 load32_be #define store32_be0 store32_be #define load64_le0 load64_le #define store64_le0 store64_le #define load64_be0 load64_be #define store64_be0 store64_be #define load128_le0 load128_le #define store128_le0 store128_le #define load128_be0 load128_be #define store128_be0 store128_be #endif