From 2e2e4cae3728d7c4565cae90e687555a7df1af12 Mon Sep 17 00:00:00 2001 From: Thomas Huth Date: Wed, 29 Jun 2011 13:18:28 +0200 Subject: Move functions for byte-swapping into common header file. The byte-swapping functions were scattered all over the source tree, now they are merged into a new common header file called byteswap.h. Signed-off-by: --- include/byteorder.h | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 include/byteorder.h (limited to 'include/byteorder.h') diff --git a/include/byteorder.h b/include/byteorder.h new file mode 100644 index 0000000..0d7ebee --- /dev/null +++ b/include/byteorder.h @@ -0,0 +1,78 @@ +/****************************************************************************** + * Copyright (c) 2011 IBM Corporation + * All rights reserved. + * This program and the accompanying materials + * are made available under the terms of the BSD License + * which accompanies this distribution, and is available at + * http://www.opensource.org/licenses/bsd-license.php + * + * Contributors: + * IBM Corporation - initial implementation + *****************************************************************************/ + +/* + * Common byteorder (endianess) macros + */ + +#ifndef BYTEORDER_H +#define BYTEORDER_H + +static inline uint16_t +bswap_16 (uint16_t x) +{ + return ((x&0xff00) >> 8) | ((x&0xff) << 8); +} + +static inline uint32_t +bswap_32 (uint32_t x) +{ + return bswap_16(x >> 16) | (bswap_16(x) << 16); +} + +static inline uint64_t +bswap_64 (uint64_t x) +{ + return (uint64_t) bswap_32(x >> 32) | (uint64_t) bswap_32(x) << 32; +} + + +/* gcc defines __BIG_ENDIAN__ on big endian targets */ +#ifdef __BIG_ENDIAN__ + +#define cpu_to_be16(x) (x) +#define cpu_to_be32(x) (x) +#define cpu_to_be64(x) (x) + +#define be16_to_cpu(x) (x) +#define be32_to_cpu(x) (x) +#define be64_to_cpu(x) (x) + +#define le16_to_cpu(x) bswap_16(x) +#define le32_to_cpu(x) bswap_32(x) +#define le64_to_cpu(x) bswap_64(x) + +#define cpu_to_le16(x) bswap_16(x) +#define cpu_to_le32(x) bswap_32(x) +#define cpu_to_le64(x) bswap_64(x) + +#else + +#define cpu_to_be16(x) bswap_16(x) +#define cpu_to_be32(x) bswap_32(x) +#define cpu_to_be64(x) bswap_64(x) + +#define be16_to_cpu(x) bswap_16(x) +#define be32_to_cpu(x) bswap_32(x) +#define be64_to_cpu(x) bswap_64(x) + +#define le16_to_cpu(x) (x) +#define le32_to_cpu(x) (x) +#define le64_to_cpu(x) (x) + +#define cpu_to_le16(x) (x) +#define cpu_to_le32(x) (x) +#define cpu_to_le64(x) (x) + +#endif /* __BIG_ENDIAN__ */ + +#endif /* BYTEORDER_H */ -- cgit v1.1