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6e72370fd7
This imports licensing clarifications and updates as discussed on
samba-technical ("Subject: Re: ccan code breaks older build farm
systems").
In particular, the recent version have per-file license markers, and
some modules are relicenced more liberally: in particular Simo pointed
out that htable was GPL, and indirectly included by libtdb2, which
would have made that GPL as well.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Autobuild-User: Rusty Russell <rusty@rustcorp.com.au>
Autobuild-Date: Mon Jul 25 12:03:40 CEST 2011 on sn-devel-104
228 lines
4.8 KiB
C
228 lines
4.8 KiB
C
/* Licensed under LGPLv2.1+ - see LICENSE file for details */
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#ifndef CCAN_ENDIAN_H
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#define CCAN_ENDIAN_H
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#include <stdint.h>
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#include "config.h"
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#if HAVE_BYTESWAP_H
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#include <byteswap.h>
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#else
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/**
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* bswap_16 - reverse bytes in a uint16_t value.
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* @val: value whose bytes to swap.
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*
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* Example:
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* // Output contains "1024 is 4 as two bytes reversed"
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* printf("1024 is %u as two bytes reversed\n", bswap_16(1024));
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*/
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static inline uint16_t bswap_16(uint16_t val)
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{
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return ((val & (uint16_t)0x00ffU) << 8)
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| ((val & (uint16_t)0xff00U) >> 8);
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}
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/**
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* bswap_32 - reverse bytes in a uint32_t value.
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* @val: value whose bytes to swap.
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*
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* Example:
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* // Output contains "1024 is 262144 as four bytes reversed"
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* printf("1024 is %u as four bytes reversed\n", bswap_32(1024));
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*/
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static inline uint32_t bswap_32(uint32_t val)
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{
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return ((val & (uint32_t)0x000000ffUL) << 24)
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| ((val & (uint32_t)0x0000ff00UL) << 8)
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| ((val & (uint32_t)0x00ff0000UL) >> 8)
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| ((val & (uint32_t)0xff000000UL) >> 24);
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}
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#endif /* !HAVE_BYTESWAP_H */
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#if !HAVE_BSWAP_64
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/**
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* bswap_64 - reverse bytes in a uint64_t value.
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* @val: value whose bytes to swap.
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*
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* Example:
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* // Output contains "1024 is 1125899906842624 as eight bytes reversed"
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* printf("1024 is %llu as eight bytes reversed\n",
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* (unsigned long long)bswap_64(1024));
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*/
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static inline uint64_t bswap_64(uint64_t val)
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{
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return ((val & (uint64_t)0x00000000000000ffULL) << 56)
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| ((val & (uint64_t)0x000000000000ff00ULL) << 40)
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| ((val & (uint64_t)0x0000000000ff0000ULL) << 24)
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| ((val & (uint64_t)0x00000000ff000000ULL) << 8)
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| ((val & (uint64_t)0x000000ff00000000ULL) >> 8)
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| ((val & (uint64_t)0x0000ff0000000000ULL) >> 24)
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| ((val & (uint64_t)0x00ff000000000000ULL) >> 40)
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| ((val & (uint64_t)0xff00000000000000ULL) >> 56);
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}
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#endif
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/* Sanity check the defines. We don't handle weird endianness. */
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#if !HAVE_LITTLE_ENDIAN && !HAVE_BIG_ENDIAN
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#error "Unknown endian"
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#elif HAVE_LITTLE_ENDIAN && HAVE_BIG_ENDIAN
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#error "Can't compile for both big and little endian."
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#endif
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/**
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* cpu_to_le64 - convert a uint64_t value to little-endian
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* @native: value to convert
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*/
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static inline uint64_t cpu_to_le64(uint64_t native)
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{
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#if HAVE_LITTLE_ENDIAN
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return native;
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#else
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return bswap_64(native);
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#endif
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}
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/**
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* cpu_to_le32 - convert a uint32_t value to little-endian
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* @native: value to convert
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*/
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static inline uint32_t cpu_to_le32(uint32_t native)
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{
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#if HAVE_LITTLE_ENDIAN
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return native;
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#else
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return bswap_32(native);
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#endif
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}
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/**
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* cpu_to_le16 - convert a uint16_t value to little-endian
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* @native: value to convert
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*/
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static inline uint16_t cpu_to_le16(uint16_t native)
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{
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#if HAVE_LITTLE_ENDIAN
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return native;
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#else
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return bswap_16(native);
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#endif
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}
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/**
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* le64_to_cpu - convert a little-endian uint64_t value
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* @le_val: little-endian value to convert
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*/
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static inline uint64_t le64_to_cpu(uint64_t le_val)
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{
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#if HAVE_LITTLE_ENDIAN
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return le_val;
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#else
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return bswap_64(le_val);
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#endif
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}
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/**
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* le32_to_cpu - convert a little-endian uint32_t value
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* @le_val: little-endian value to convert
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*/
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static inline uint32_t le32_to_cpu(uint32_t le_val)
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{
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#if HAVE_LITTLE_ENDIAN
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return le_val;
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#else
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return bswap_32(le_val);
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#endif
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}
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/**
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* le16_to_cpu - convert a little-endian uint16_t value
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* @le_val: little-endian value to convert
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*/
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static inline uint16_t le16_to_cpu(uint16_t le_val)
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{
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#if HAVE_LITTLE_ENDIAN
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return le_val;
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#else
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return bswap_16(le_val);
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#endif
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}
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/**
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* cpu_to_be64 - convert a uint64_t value to big endian.
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* @native: value to convert
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*/
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static inline uint64_t cpu_to_be64(uint64_t native)
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{
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#if HAVE_LITTLE_ENDIAN
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return bswap_64(native);
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#else
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return native;
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#endif
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}
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/**
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* cpu_to_be32 - convert a uint32_t value to big endian.
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* @native: value to convert
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*/
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static inline uint32_t cpu_to_be32(uint32_t native)
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{
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#if HAVE_LITTLE_ENDIAN
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return bswap_32(native);
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#else
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return native;
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#endif
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}
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/**
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* cpu_to_be16 - convert a uint16_t value to big endian.
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* @native: value to convert
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*/
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static inline uint16_t cpu_to_be16(uint16_t native)
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{
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#if HAVE_LITTLE_ENDIAN
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return bswap_16(native);
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#else
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return native;
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#endif
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}
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/**
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* be64_to_cpu - convert a big-endian uint64_t value
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* @be_val: big-endian value to convert
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*/
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static inline uint64_t be64_to_cpu(uint64_t be_val)
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{
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#if HAVE_LITTLE_ENDIAN
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return bswap_64(be_val);
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#else
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return be_val;
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#endif
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}
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/**
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* be32_to_cpu - convert a big-endian uint32_t value
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* @be_val: big-endian value to convert
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*/
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static inline uint32_t be32_to_cpu(uint32_t be_val)
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{
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#if HAVE_LITTLE_ENDIAN
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return bswap_32(be_val);
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#else
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return be_val;
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#endif
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}
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/**
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* be16_to_cpu - convert a big-endian uint16_t value
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* @be_val: big-endian value to convert
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*/
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static inline uint16_t be16_to_cpu(uint16_t be_val)
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{
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#if HAVE_LITTLE_ENDIAN
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return bswap_16(be_val);
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#else
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return be_val;
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#endif
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}
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#endif /* CCAN_ENDIAN_H */
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