le64tohbe64toh

le64tohbe64toh is not a standard programming term or a single library function. Rather, it appears to be a concatenation of two endian-conversion macros used in C and C-like languages: le64toh and be64toh. These macros convert 64-bit integers from a specified byte order (little-endian or big-endian) to the host machine’s native byte order.

Endianness refers to the ordering of bytes within multi-byte values. Little-endian stores the least significant byte first, while big-endian stores the most significant byte first. The host’s endianness determines how such values should be interpreted after being read from external data sources or files.

le64toh converts a 64-bit value encoded in little-endian to the host’s endianness. be64toh does the same for a value encoded in big-endian. On a little-endian host, le64toh and be64toh may be no-ops or perform minimal checks; on a big-endian host, they swap bytes as needed to produce a correct host-order value. Their counterparts for host-to-endian conversions are htobe64, htole64, etc.

Availability and usage vary by platform. These macros are typically defined in endian-related headers such as <endian.h> or <sys/endian.h> on Unix-like systems. Some environments provide equivalent functionality via compiler intrinsics or different header names. When working with mixed-endian binary formats, developers apply le64toh to little-endian data and be64toh to big-endian data to obtain values in host order.

Notes: le64tohbe64toh is not a single standard API; treat it as a textual reference to the pair of macros. Ensure you use the appropriate macro for each value and verify header availability on your target platform.

See also: Endianness, Endian macros, 64-bit integers, htobe64, htole64.