#include <stdint.h>
#include "config.h"
+#if HAVE_BYTESWAP_H
+#include <byteswap.h>
+#else
/**
- * swab_u16 - reverse bytes in a uint16_t value.
+ * bswap_16 - reverse bytes in a uint16_t value.
* @val: value whose bytes to swap.
+ *
+ * Example:
+ * // Output contains "1024 is 4 as two bytes reversed"
+ * printf("1024 is %u as two bytes reversed\n", bswap_16(1024));
*/
-static inline uint16_t swab_u16(uint16_t val)
+static inline uint16_t bswap_16(uint16_t val)
{
return ((val & (uint16_t)0x00ffU) << 8)
| ((val & (uint16_t)0xff00U) >> 8);
}
/**
- * swab_u32 - reverse bytes in a uint32_t value.
+ * bswap_32 - reverse bytes in a uint32_t value.
* @val: value whose bytes to swap.
+ *
+ * Example:
+ * // Output contains "1024 is 262144 as four bytes reversed"
+ * printf("1024 is %u as four bytes reversed\n", bswap_32(1024));
*/
-static inline uint32_t swab_u32(uint32_t val)
+static inline uint32_t bswap_32(uint32_t val)
{
return ((val & (uint32_t)0x000000ffUL) << 24)
| ((val & (uint32_t)0x0000ff00UL) << 8)
- | ((val & (uint32_t)0x00ff0000UL) >> 8)
+ | ((val & (uint32_t)0x00ff0000UL) >> 8)
| ((val & (uint32_t)0xff000000UL) >> 24);
}
+#endif /* !HAVE_BYTESWAP_H */
+#if !HAVE_BSWAP_64
/**
- * swab_u64 - reverse bytes in a uint64_t value.
+ * bswap_64 - reverse bytes in a uint64_t value.
* @val: value whose bytes to swap.
+ *
+ * Example:
+ * // Output contains "1024 is 1125899906842624 as eight bytes reversed"
+ * printf("1024 is %llu as eight bytes reversed\n",
+ * (unsigned long long)bswap_64(1024));
*/
-static inline uint64_t swab_u64(uint64_t val)
+static inline uint64_t bswap_64(uint64_t val)
{
return ((val & (uint64_t)0x00000000000000ffULL) << 56)
| ((val & (uint64_t)0x000000000000ff00ULL) << 40)
| ((val & (uint64_t)0x00ff000000000000ULL) >> 40)
| ((val & (uint64_t)0xff00000000000000ULL) >> 56);
}
+#endif
/* Sanity check the defines. We don't handle weird endianness. */
#if !HAVE_LITTLE_ENDIAN && !HAVE_BIG_ENDIAN
#if HAVE_LITTLE_ENDIAN
return native;
#else
- return swab_u64(native);
+ return bswap_64(native);
#endif
}
#if HAVE_LITTLE_ENDIAN
return native;
#else
- return swab_u32(native);
+ return bswap_32(native);
#endif
}
#if HAVE_LITTLE_ENDIAN
return native;
#else
- return swab_u16(native);
+ return bswap_16(native);
#endif
}
#if HAVE_LITTLE_ENDIAN
return le_val;
#else
- return swab_u64(le_val);
+ return bswap_64(le_val);
#endif
}
#if HAVE_LITTLE_ENDIAN
return le_val;
#else
- return swab_u32(le_val);
+ return bswap_32(le_val);
#endif
}
#if HAVE_LITTLE_ENDIAN
return le_val;
#else
- return swab_u16(le_val);
+ return bswap_16(le_val);
#endif
}
static inline uint64_t cpu_to_be64(uint64_t native)
{
#if HAVE_LITTLE_ENDIAN
- return swab_u64(native);
+ return bswap_64(native);
#else
return native;
#endif
static inline uint32_t cpu_to_be32(uint32_t native)
{
#if HAVE_LITTLE_ENDIAN
- return swab_u32(native);
+ return bswap_32(native);
#else
return native;
#endif
static inline uint16_t cpu_to_be16(uint16_t native)
{
#if HAVE_LITTLE_ENDIAN
- return swab_u16(native);
+ return bswap_16(native);
#else
return native;
#endif
static inline uint64_t be64_to_cpu(uint64_t be_val)
{
#if HAVE_LITTLE_ENDIAN
- return swab_u64(be_val);
+ return bswap_64(be_val);
#else
return be_val;
#endif
static inline uint32_t be32_to_cpu(uint32_t be_val)
{
#if HAVE_LITTLE_ENDIAN
- return swab_u32(be_val);
+ return bswap_32(be_val);
#else
return be_val;
#endif
static inline uint16_t be16_to_cpu(uint16_t be_val)
{
#if HAVE_LITTLE_ENDIAN
- return swab_u16(be_val);
+ return bswap_16(be_val);
#else
return be_val;
#endif