4 * Copyright 2004 Develer S.r.l. (http://www.develer.com/)
5 * This file is part of DevLib - See devlib/README for information.
8 * \brief Functions to convert integers to/from host byte-order.
12 * \author Bernardo Innocenti <bernie@develer.com>
13 * \author Stefano Fedrigo <aleph@develer.com>
18 * Revision 1.3 2004/07/20 23:47:12 bernie
19 * Finally remove redundant protos.
21 * Revision 1.2 2004/07/20 17:09:11 bernie
22 * swab16(), swab32(), cpu_to_be32(), cpu_to_le32(): New functions.
24 * Revision 1.1 2004/07/20 16:26:15 bernie
25 * Import byte-order macros into DevLib.
29 #ifndef MWARE_BYTEORDER_H
30 #define MWARE_BYTEORDER_H
36 * \brief Swap upper and lower bytes in a 16-bit value.
38 INLINE uint16_t swab16(uint16_t x)
40 return ((x & (uint16_t)0x00FFU) << 8)
41 | ((x & (uint16_t)0xFF00U) >> 8);
45 * \brief Reverse bytes in a 32-bit value (e.g.: 0x12345678 -> 0x78563412).
47 INLINE uint16_t swab32(uint16_t x)
49 return ((x & (uint32_t)0x000000FFUL) << 24)
50 | ((x & (uint32_t)0x0000FF00UL) << 8)
51 | ((x & (uint32_t)0x00FF0000UL) >> 8)
52 | ((x & (uint32_t)0xFF000000UL) >> 24);
55 INLINE uint16_t cpu_to_be16(uint16_t x)
57 return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab16(x) : x;
60 INLINE uint16_t cpu_to_le16(uint16_t x)
62 return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab16(x) : x;
65 INLINE uint32_t cpu_to_be32(uint32_t x)
67 return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab32(x) : x;
70 INLINE uint32_t cpu_to_le32(uint32_t x)
72 return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab32(x) : x;
75 #endif /* MWARE_BYTEORDER_H */