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