/
githubmirror
/
ipxe
Обзор
Документация
Войти
/
githubmirror
/
ipxe
Код
Запросы
0
Пакеты
0
Релизы
0
Аналитика
Безопасность
v1.21.1
src/include/byteswap.h
138 строк
5 KB
Michael Brown
[libc] Rewrite byte-swapping code
02 мар 2015, 19:35
02 мар 2015, 19:35
01d16d8
Код
Авторство
О чём код?
#ifndef BYTESWAP_H #define BYTESWAP_H FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); #include <stdint.h> #include <endian.h> #include <bits/byteswap.h> /** * Byte-swap a 16-bit constant * * @v value Constant value * @ret swapped Byte-swapped value */ #define __bswap_constant_16( value ) \ ( ( ( (value) & 0x00ff ) << 8 ) | \ ( ( (value) & 0xff00 ) >> 8 ) ) /** * Byte-swap a 32-bit constant * * @v value Constant value * @ret swapped Byte-swapped value */ #define __bswap_constant_32( value ) \ ( ( ( (value) & 0x000000ffUL ) << 24 ) | \ ( ( (value) & 0x0000ff00UL ) << 8 ) | \ ( ( (value) & 0x00ff0000UL ) >> 8 ) | \ ( ( (value) & 0xff000000UL ) >> 24 ) ) /** * Byte-swap a 64-bit constant * * @v value Constant value * @ret swapped Byte-swapped value */ #define __bswap_constant_64( value ) \ ( ( ( (value) & 0x00000000000000ffULL ) << 56 ) | \ ( ( (value) & 0x000000000000ff00ULL ) << 40 ) | \ ( ( (value) & 0x0000000000ff0000ULL ) << 24 ) | \ ( ( (value) & 0x00000000ff000000ULL ) << 8 ) | \ ( ( (value) & 0x000000ff00000000ULL ) >> 8 ) | \ ( ( (value) & 0x0000ff0000000000ULL ) >> 24 ) | \ ( ( (value) & 0x00ff000000000000ULL ) >> 40 ) | \ ( ( (value) & 0xff00000000000000ULL ) >> 56 ) ) /** * Byte-swap a 16-bit value * * @v value Value * @ret swapped Byte-swapped value */ #define __bswap_16( value ) \ ( __builtin_constant_p (value) ? \ ( ( uint16_t ) __bswap_constant_16 ( ( uint16_t ) (value) ) ) \ : __bswap_variable_16 (value) ) #define bswap_16( value ) __bswap_16 (value) /** * Byte-swap a 32-bit value * * @v value Value * @ret swapped Byte-swapped value */ #define __bswap_32( value ) \ ( __builtin_constant_p (value) ? \ ( ( uint32_t ) __bswap_constant_32 ( ( uint32_t ) (value) ) ) \ : __bswap_variable_32 (value) ) #define bswap_32( value ) __bswap_32 (value) /** * Byte-swap a 64-bit value * * @v value Value * @ret swapped Byte-swapped value */ #define __bswap_64( value ) \ ( __builtin_constant_p (value) ? \ ( ( uint64_t ) __bswap_constant_64 ( ( uint64_t ) (value) ) ) \ : __bswap_variable_64 (value) ) #define bswap_64( value ) __bswap_64 (value) #if __BYTE_ORDER == __LITTLE_ENDIAN #define __cpu_to_leNN( bits, value ) (value) #define __cpu_to_beNN( bits, value ) __bswap_ ## bits (value) #define __leNN_to_cpu( bits, value ) (value) #define __beNN_to_cpu( bits, value ) __bswap_ ## bits (value) #define __cpu_to_leNNs( bits, ptr ) do { } while ( 0 ) #define __cpu_to_beNNs( bits, ptr ) __bswap_ ## bits ## s (ptr) #define __leNN_to_cpus( bits, ptr ) do { } while ( 0 ) #define __beNN_to_cpus( bits, ptr ) __bswap_ ## bits ## s (ptr) #endif #if __BYTE_ORDER == __BIG_ENDIAN #define __cpu_to_leNN( bits, value ) __bswap_ ## bits (value) #define __cpu_to_beNN( bits, value ) (value) #define __leNN_to_cpu( bits, value ) __bswap_ ## bits (value) #define __beNN_to_cpu( bits, value ) (value) #define __cpu_to_leNNs( bits, ptr ) __bswap_ ## bits ## s (ptr) #define __cpu_to_beNNs( bits, ptr ) do { } while ( 0 ) #define __leNN_to_cpus( bits, ptr ) __bswap_ ## bits ## s (ptr) #define __beNN_to_cpus( bits, ptr ) do { } while ( 0 ) #endif #define cpu_to_le16( value ) __cpu_to_leNN ( 16, value ) #define cpu_to_le32( value ) __cpu_to_leNN ( 32, value ) #define cpu_to_le64( value ) __cpu_to_leNN ( 64, value ) #define cpu_to_be16( value ) __cpu_to_beNN ( 16, value ) #define cpu_to_be32( value ) __cpu_to_beNN ( 32, value ) #define cpu_to_be64( value ) __cpu_to_beNN ( 64, value ) #define le16_to_cpu( value ) __leNN_to_cpu ( 16, value ) #define le32_to_cpu( value ) __leNN_to_cpu ( 32, value ) #define le64_to_cpu( value ) __leNN_to_cpu ( 64, value ) #define be16_to_cpu( value ) __beNN_to_cpu ( 16, value ) #define be32_to_cpu( value ) __beNN_to_cpu ( 32, value ) #define be64_to_cpu( value ) __beNN_to_cpu ( 64, value ) #define cpu_to_le16s( ptr ) __cpu_to_leNNs ( 16, ptr ) #define cpu_to_le32s( ptr ) __cpu_to_leNNs ( 32, ptr ) #define cpu_to_le64s( ptr ) __cpu_to_leNNs ( 64, ptr ) #define cpu_to_be16s( ptr ) __cpu_to_beNNs ( 16, ptr ) #define cpu_to_be32s( ptr ) __cpu_to_beNNs ( 32, ptr ) #define cpu_to_be64s( ptr ) __cpu_to_beNNs ( 64, ptr ) #define le16_to_cpus( ptr ) __leNN_to_cpus ( 16, ptr ) #define le32_to_cpus( ptr ) __leNN_to_cpus ( 32, ptr ) #define le64_to_cpus( ptr ) __leNN_to_cpus ( 64, ptr ) #define be16_to_cpus( ptr ) __beNN_to_cpus ( 16, ptr ) #define be32_to_cpus( ptr ) __beNN_to_cpus ( 32, ptr ) #define be64_to_cpus( ptr ) __beNN_to_cpus ( 64, ptr ) #define htonll( value ) cpu_to_be64 (value) #define ntohll( value ) be64_to_cpu (value) #define htonl( value ) cpu_to_be32 (value) #define ntohl( value ) be32_to_cpu (value) #define htons( value ) cpu_to_be16 (value) #define ntohs( value ) be16_to_cpu (value) #endif /* BYTESWAP_H */