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for byte swapping, now use a seperate header in which the compatibility code lives

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Quinn
2025-06-15 15:54:38 +02:00
parent 6997e08b05
commit 1c8e3252e6
2 changed files with 51 additions and 18 deletions
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44
src/util/compat/bswap.h Normal file
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@@ -0,0 +1,44 @@
#pragma once
#include <stdint.h>
#if defined(__GNUC__) || defined(__clang__)
#define bswap16 __builtin_bswap16
#define bswap32 __builtin_bswap32
#define bswap64 __builtin_bswap64
#elif __has_include(<byteswap.h>)
#include <byteswap.h>
#define bswap16 bswap_16
#define bswap32 bswap_32
#define bswap64 bswap_64
#else
#define bswap16 bswap16_impl
#define bswap32 bswap32_impl
#define bswap64 bswap64_impl
#define IMPL_BSWAP
#endif
#if defined(IMPL_BSWAP) || !defined(NDEBUG)
static inline uint16_t bswap16_impl(uint16_t x) {
return (x << 8) | (x >> 8);
}
static inline uint32_t bswap32_impl(uint32_t x) {
return (x << 24) |
((0x0000FF00U & x) << 8) |
((0x00FF0000U & x) >> 8) |
(x >> 24);
}
static inline uint64_t bswap64_impl(uint64_t x) {
return (x << 56) |
((0x000000000000FF00ULL & x) << 40) |
((0x0000000000FF0000ULL & x) << 24) |
((0x00000000FF000000ULL & x) << 8) |
((0x000000FF00000000ULL & x) >> 8) |
((0x0000FF0000000000ULL & x) >> 24) |
((0x00FF000000000000ULL & x) >> 40) |
(x >> 56);
}
#endif
#undef IMPL_BSWAP

25
src/util/compat/endian.h
View File

@@ -5,18 +5,7 @@
#include <stdint.h> #include <stdint.h>
#include "../atrb.h" #include "../atrb.h"
#include "bswap.h"
#if __has_include(<byteswap.h>)
#include <byteswap.h>
#elif defined(__GNUC__) || defined(__clang__)
#define bswap_16 __builtin_bswap16
#define bswap_32 __builtin_bswap32
#define bswap_64 __builtin_bswap64
#else
// TODO: use custom bswap bacros
#error WIP, no support
#endif
/* little endian */ /* little endian */
atrb_const static inline uint16_t le16ton(uint16_t); // converts little-endian (LE) encoding to native for a 16 bit integer. (NOOP if native is LE) atrb_const static inline uint16_t le16ton(uint16_t); // converts little-endian (LE) encoding to native for a 16 bit integer. (NOOP if native is LE)
@@ -41,12 +30,12 @@ uint64_t le64ton(uint64_t x) { return x; }
uint16_t ntole16(uint16_t x) { return x; } uint16_t ntole16(uint16_t x) { return x; }
uint32_t ntole32(uint32_t x) { return x; } uint32_t ntole32(uint32_t x) { return x; }
uint64_t ntole64(uint64_t x) { return x; } uint64_t ntole64(uint64_t x) { return x; }
uint16_t be16ton(uint16_t x) { return bswap_16(x); } uint16_t be16ton(uint16_t x) { return bswap16(x); }
uint32_t be32ton(uint32_t x) { return bswap_32(x); } uint32_t be32ton(uint32_t x) { return bswap32(x); }
uint64_t be64ton(uint64_t x) { return bswap_64(x); } uint64_t be64ton(uint64_t x) { return bswap64(x); }
uint16_t ntobe16(uint16_t x) { return bswap_16(x); } uint16_t ntobe16(uint16_t x) { return bswap16(x); }
uint32_t ntobe32(uint32_t x) { return bswap_32(x); } uint32_t ntobe32(uint32_t x) { return bswap32(x); }
uint64_t ntobe64(uint64_t x) { return bswap_64(x); } uint64_t ntobe64(uint64_t x) { return bswap64(x); }
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
uint16_t le16ton(uint16_t x) { bswap_16(x); } uint16_t le16ton(uint16_t x) { bswap_16(x); }
uint32_t le32ton(uint32_t x) { bswap_32(x); } uint32_t le32ton(uint32_t x) { bswap_32(x); }