mirror of https://github.com/jb55/nostril.git
365 lines
9.3 KiB
C
365 lines
9.3 KiB
C
/* CC0 (Public domain) */
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#ifndef CCAN_ENDIAN_H
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#define CCAN_ENDIAN_H
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#include <stdint.h>
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#include "config.h"
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#include "cursor.h"
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/**
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* BSWAP_16 - reverse bytes in a constant uint16_t value.
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* @val: constant value whose bytes to swap.
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*
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* Designed to be usable in constant-requiring initializers.
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*
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* Example:
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* struct mystruct {
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* char buf[BSWAP_16(0x1234)];
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* };
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*/
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#define BSWAP_16(val) \
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((((uint16_t)(val) & 0x00ff) << 8) \
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| (((uint16_t)(val) & 0xff00) >> 8))
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/**
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* BSWAP_32 - reverse bytes in a constant uint32_t value.
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* @val: constant value whose bytes to swap.
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*
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* Designed to be usable in constant-requiring initializers.
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*
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* Example:
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* struct mystruct {
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* char buf[BSWAP_32(0xff000000)];
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* };
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*/
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#define BSWAP_32(val) \
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((((uint32_t)(val) & 0x000000ff) << 24) \
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| (((uint32_t)(val) & 0x0000ff00) << 8) \
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| (((uint32_t)(val) & 0x00ff0000) >> 8) \
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| (((uint32_t)(val) & 0xff000000) >> 24))
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/**
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* BSWAP_64 - reverse bytes in a constant uint64_t value.
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* @val: constantvalue whose bytes to swap.
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*
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* Designed to be usable in constant-requiring initializers.
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*
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* Example:
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* struct mystruct {
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* char buf[BSWAP_64(0xff00000000000000ULL)];
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* };
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*/
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#define BSWAP_64(val) \
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((((uint64_t)(val) & 0x00000000000000ffULL) << 56) \
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| (((uint64_t)(val) & 0x000000000000ff00ULL) << 40) \
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| (((uint64_t)(val) & 0x0000000000ff0000ULL) << 24) \
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| (((uint64_t)(val) & 0x00000000ff000000ULL) << 8) \
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| (((uint64_t)(val) & 0x000000ff00000000ULL) >> 8) \
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| (((uint64_t)(val) & 0x0000ff0000000000ULL) >> 24) \
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| (((uint64_t)(val) & 0x00ff000000000000ULL) >> 40) \
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| (((uint64_t)(val) & 0xff00000000000000ULL) >> 56))
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#if HAVE_BYTESWAP_H
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#include <byteswap.h>
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#else
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/**
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* bswap_16 - reverse bytes in a uint16_t value.
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* @val: value whose bytes to swap.
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*
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* Example:
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* // Output contains "1024 is 4 as two bytes reversed"
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* printf("1024 is %u as two bytes reversed\n", bswap_16(1024));
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*/
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static inline uint16_t bswap_16(uint16_t val)
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{
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return BSWAP_16(val);
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}
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/**
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* bswap_32 - reverse bytes in a uint32_t value.
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* @val: value whose bytes to swap.
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*
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* Example:
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* // Output contains "1024 is 262144 as four bytes reversed"
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* printf("1024 is %u as four bytes reversed\n", bswap_32(1024));
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*/
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static inline uint32_t bswap_32(uint32_t val)
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{
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return BSWAP_32(val);
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}
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#endif /* !HAVE_BYTESWAP_H */
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#if !HAVE_BSWAP_64
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/**
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* bswap_64 - reverse bytes in a uint64_t value.
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* @val: value whose bytes to swap.
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*
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* Example:
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* // Output contains "1024 is 1125899906842624 as eight bytes reversed"
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* printf("1024 is %llu as eight bytes reversed\n",
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* (unsigned long long)bswap_64(1024));
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*/
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static inline uint64_t bswap_64(uint64_t val)
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{
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return BSWAP_64(val);
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}
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#endif
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/* Needed for Glibc like endiness check */
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#define __LITTLE_ENDIAN 1234
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#define __BIG_ENDIAN 4321
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/* Sanity check the defines. We don't handle weird endianness. */
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#if !HAVE_LITTLE_ENDIAN && !HAVE_BIG_ENDIAN
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#error "Unknown endian"
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#elif HAVE_LITTLE_ENDIAN && HAVE_BIG_ENDIAN
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#error "Can't compile for both big and little endian."
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#elif HAVE_LITTLE_ENDIAN
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#ifndef __BYTE_ORDER
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#define __BYTE_ORDER __LITTLE_ENDIAN
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#elif __BYTE_ORDER != __LITTLE_ENDIAN
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#error "__BYTE_ORDER already defined, but not equal to __LITTLE_ENDIAN"
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#endif
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#elif HAVE_BIG_ENDIAN
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#ifndef __BYTE_ORDER
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#define __BYTE_ORDER __BIG_ENDIAN
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#elif __BYTE_ORDER != __BIG_ENDIAN
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#error "__BYTE_ORDER already defined, but not equal to __BIG_ENDIAN"
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#endif
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#endif
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#ifdef __CHECKER__
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/* sparse needs forcing to remove bitwise attribute from ccan/short_types */
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#define ENDIAN_CAST __attribute__((force))
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#define ENDIAN_TYPE __attribute__((bitwise))
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#else
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#define ENDIAN_CAST
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#define ENDIAN_TYPE
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#endif
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typedef uint64_t ENDIAN_TYPE leint64_t;
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typedef uint64_t ENDIAN_TYPE beint64_t;
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typedef uint32_t ENDIAN_TYPE leint32_t;
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typedef uint32_t ENDIAN_TYPE beint32_t;
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typedef uint16_t ENDIAN_TYPE leint16_t;
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typedef uint16_t ENDIAN_TYPE beint16_t;
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#if HAVE_LITTLE_ENDIAN
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/**
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* CPU_TO_LE64 - convert a constant uint64_t value to little-endian
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* @native: constant to convert
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*/
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#define CPU_TO_LE64(native) ((ENDIAN_CAST leint64_t)(native))
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/**
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* CPU_TO_LE32 - convert a constant uint32_t value to little-endian
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* @native: constant to convert
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*/
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#define CPU_TO_LE32(native) ((ENDIAN_CAST leint32_t)(native))
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/**
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* CPU_TO_LE16 - convert a constant uint16_t value to little-endian
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* @native: constant to convert
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*/
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#define CPU_TO_LE16(native) ((ENDIAN_CAST leint16_t)(native))
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/**
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* LE64_TO_CPU - convert a little-endian uint64_t constant
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* @le_val: little-endian constant to convert
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*/
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#define LE64_TO_CPU(le_val) ((ENDIAN_CAST uint64_t)(le_val))
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/**
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* LE32_TO_CPU - convert a little-endian uint32_t constant
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* @le_val: little-endian constant to convert
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*/
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#define LE32_TO_CPU(le_val) ((ENDIAN_CAST uint32_t)(le_val))
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/**
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* LE16_TO_CPU - convert a little-endian uint16_t constant
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* @le_val: little-endian constant to convert
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*/
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#define LE16_TO_CPU(le_val) ((ENDIAN_CAST uint16_t)(le_val))
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#else /* ... HAVE_BIG_ENDIAN */
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#define CPU_TO_LE64(native) ((ENDIAN_CAST leint64_t)BSWAP_64(native))
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#define CPU_TO_LE32(native) ((ENDIAN_CAST leint32_t)BSWAP_32(native))
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#define CPU_TO_LE16(native) ((ENDIAN_CAST leint16_t)BSWAP_16(native))
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#define LE64_TO_CPU(le_val) BSWAP_64((ENDIAN_CAST uint64_t)le_val)
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#define LE32_TO_CPU(le_val) BSWAP_32((ENDIAN_CAST uint32_t)le_val)
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#define LE16_TO_CPU(le_val) BSWAP_16((ENDIAN_CAST uint16_t)le_val)
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#endif /* HAVE_BIG_ENDIAN */
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#if HAVE_BIG_ENDIAN
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/**
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* CPU_TO_BE64 - convert a constant uint64_t value to big-endian
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* @native: constant to convert
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*/
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#define CPU_TO_BE64(native) ((ENDIAN_CAST beint64_t)(native))
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/**
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* CPU_TO_BE32 - convert a constant uint32_t value to big-endian
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* @native: constant to convert
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*/
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#define CPU_TO_BE32(native) ((ENDIAN_CAST beint32_t)(native))
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/**
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* CPU_TO_BE16 - convert a constant uint16_t value to big-endian
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* @native: constant to convert
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*/
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#define CPU_TO_BE16(native) ((ENDIAN_CAST beint16_t)(native))
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/**
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* BE64_TO_CPU - convert a big-endian uint64_t constant
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* @le_val: big-endian constant to convert
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*/
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#define BE64_TO_CPU(le_val) ((ENDIAN_CAST uint64_t)(le_val))
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/**
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* BE32_TO_CPU - convert a big-endian uint32_t constant
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* @le_val: big-endian constant to convert
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*/
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#define BE32_TO_CPU(le_val) ((ENDIAN_CAST uint32_t)(le_val))
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/**
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* BE16_TO_CPU - convert a big-endian uint16_t constant
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* @le_val: big-endian constant to convert
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*/
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#define BE16_TO_CPU(le_val) ((ENDIAN_CAST uint16_t)(le_val))
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#else /* ... HAVE_LITTLE_ENDIAN */
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#define CPU_TO_BE64(native) ((ENDIAN_CAST beint64_t)BSWAP_64(native))
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#define CPU_TO_BE32(native) ((ENDIAN_CAST beint32_t)BSWAP_32(native))
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#define CPU_TO_BE16(native) ((ENDIAN_CAST beint16_t)BSWAP_16(native))
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#define BE64_TO_CPU(le_val) BSWAP_64((ENDIAN_CAST uint64_t)le_val)
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#define BE32_TO_CPU(le_val) BSWAP_32((ENDIAN_CAST uint32_t)le_val)
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#define BE16_TO_CPU(le_val) BSWAP_16((ENDIAN_CAST uint16_t)le_val)
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#endif /* HAVE_LITTE_ENDIAN */
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/**
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* cpu_to_le64 - convert a uint64_t value to little-endian
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* @native: value to convert
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*/
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static inline leint64_t cpu_to_le64(uint64_t native)
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{
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return CPU_TO_LE64(native);
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}
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/**
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* cpu_to_le32 - convert a uint32_t value to little-endian
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* @native: value to convert
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*/
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static inline leint32_t cpu_to_le32(uint32_t native)
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{
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return CPU_TO_LE32(native);
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}
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/**
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* cpu_to_le16 - convert a uint16_t value to little-endian
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* @native: value to convert
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*/
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static inline leint16_t cpu_to_le16(uint16_t native)
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{
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return CPU_TO_LE16(native);
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}
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/**
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* le64_to_cpu - convert a little-endian uint64_t value
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* @le_val: little-endian value to convert
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*/
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static inline uint64_t le64_to_cpu(leint64_t le_val)
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{
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return LE64_TO_CPU(le_val);
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}
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/**
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* le32_to_cpu - convert a little-endian uint32_t value
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* @le_val: little-endian value to convert
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*/
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static inline uint32_t le32_to_cpu(leint32_t le_val)
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{
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return LE32_TO_CPU(le_val);
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}
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/**
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* le16_to_cpu - convert a little-endian uint16_t value
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* @le_val: little-endian value to convert
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*/
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static inline uint16_t le16_to_cpu(leint16_t le_val)
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{
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return LE16_TO_CPU(le_val);
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}
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/**
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* cpu_to_be64 - convert a uint64_t value to big endian.
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* @native: value to convert
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*/
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static inline beint64_t cpu_to_be64(uint64_t native)
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{
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return CPU_TO_BE64(native);
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}
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/**
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* cpu_to_be32 - convert a uint32_t value to big endian.
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* @native: value to convert
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*/
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static inline beint32_t cpu_to_be32(uint32_t native)
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{
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return CPU_TO_BE32(native);
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}
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/**
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* cpu_to_be16 - convert a uint16_t value to big endian.
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* @native: value to convert
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*/
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static inline beint16_t cpu_to_be16(uint16_t native)
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{
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return CPU_TO_BE16(native);
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}
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/**
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* be64_to_cpu - convert a big-endian uint64_t value
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* @be_val: big-endian value to convert
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*/
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static inline uint64_t be64_to_cpu(beint64_t be_val)
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{
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return BE64_TO_CPU(be_val);
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}
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/**
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* be32_to_cpu - convert a big-endian uint32_t value
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* @be_val: big-endian value to convert
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*/
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static inline uint32_t be32_to_cpu(beint32_t be_val)
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{
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return BE32_TO_CPU(be_val);
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}
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/**
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* be16_to_cpu - convert a big-endian uint16_t value
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* @be_val: big-endian value to convert
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*/
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static inline uint16_t be16_to_cpu(beint16_t be_val)
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{
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return BE16_TO_CPU(be_val);
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}
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/**
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* be64/be32/be16 - 64/32/16 bit big-endian representation.
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*/
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typedef beint64_t be64;
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typedef beint32_t be32;
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typedef beint16_t be16;
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/**
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* le64/le32/le16 - 64/32/16 bit little-endian representation.
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*/
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typedef leint64_t le64;
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typedef leint32_t le32;
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typedef leint16_t le16;
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#endif /* CCAN_ENDIAN_H */
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