byteorder.h
上传用户:xiejiait
上传日期:2007-01-06
资源大小:881k
文件大小:2k
- /* @(#)byteorder.h 1.2 99/12/19 Copyright 1998,1999 Heiko Eissfeldt */
- #ifndef MYBYTE_ORDER
- #define MYBYTE_ORDER 1
- /* supply the byte order macros */
- #if defined (WORDS_BIGENDIAN)
- # define MY_BIG_ENDIAN 1
- # define MY_LITTLE_ENDIAN 0
- #else
- # define MY_BIG_ENDIAN 0
- # define MY_LITTLE_ENDIAN 1
- #endif
- # undef cpu_to_le32
- # undef cpu_to_le16
- # undef cpu_to_be32
- # undef cpu_to_be16
- # undef le32_to_cpu
- # undef le16_to_cpu
- # undef be32_to_cpu
- # undef be16_to_cpu
- #if MY_BIG_ENDIAN == 1
- # define cpu_to_le32(x)
- ((unsigned long int)((((unsigned long int)(x) & ULONG_C(0x000000ff)) << 24) |
- (((unsigned long int)(x) & ULONG_C(0x0000ff00)) << 8) |
- (((unsigned long int)(x) & ULONG_C(0x00ff0000)) >> 8) |
- (((unsigned long int)(x) & ULONG_C(0xff000000)) >> 24)))
- # define cpu_to_le16(x)
- ((unsigned short int)((((unsigned short int)(x) & 0x00ff) << 8) |
- (((unsigned short int)(x) & 0xff00) >> 8)))
- # define le32_to_cpu(x) cpu_to_le32(x)
- # define le16_to_cpu(x) cpu_to_le16(x)
- # define cpu_to_be32(x) (x)
- # define cpu_to_be16(x) (x)
- # define be32_to_cpu(x) (x)
- # define be16_to_cpu(x) (x)
- #else
- # define cpu_to_be32(x)
- ((unsigned long int)((((unsigned long int)(x) & ULONG_C(0x000000ff)) << 24) |
- (((unsigned long int)(x) & ULONG_C(0x0000ff00)) << 8) |
- (((unsigned long int)(x) & ULONG_C(0x00ff0000)) >> 8) |
- (((unsigned long int)(x) & ULONG_C(0xff000000)) >> 24)))
- # define cpu_to_be16(x)
- ((unsigned short int)((((unsigned short int)(x) & 0x00ff) << 8) |
- (((unsigned short int)(x) & 0xff00) >> 8)))
- # define be32_to_cpu(x) cpu_to_be32(x)
- # define be16_to_cpu(x) cpu_to_be16(x)
- # define cpu_to_le32(x) (x)
- # define cpu_to_le16(x) (x)
- # define le32_to_cpu(x) (x)
- # define le16_to_cpu(x) (x)
- #endif
- #define GET_LE_UINT_FROM_CHARP(p) ((unsigned int)((*(p+3))<<24)|((*(p+2))<<16)|((*(p+1))<<8)|(*(p)))
- #define GET_BE_UINT_FROM_CHARP(p) ((unsigned int)((*(p))<<24)|((*(p+1))<<16)|((*(p+2))<<8)|(*(p+3)))
- #endif /* ifndef MYBYTE_ORDER */