package cstruct

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Big-endian Byte Order

cstruct
- Cstruct
  - BE
  - LE
- Cstruct_cap
  - BE
  - LE

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Big-endian Byte Order

The following operations assume a big-endian byte ordering of the cstruct. If the machine-native byte ordering differs, then the get operations will reorder the bytes so that they are in machine-native byte order before returning the result, and the set operations will reorder the bytes so that they are written out in the appropriate order.

Network byte order is big-endian, so you may need these operations when dealing with raw frames, for example, in a userland networking stack.

val get_uint16 : 'a rd t -> int -> uint16

get_uint16 t i returns the two bytes in t starting at offset i, interpreted as an uint16. Sign extension is not interpreted.

raises Invalid_argument
if t is too small.

val get_uint32 : 'a rd t -> int -> uint32

get_uint32 t i returns the four bytes in t starting at offset i. t needs at least read-capability rd.

raises Invalid_argument
if t is too small.

val get_uint64 : 'a rd t -> int -> uint64

get_uint64 t i returns the eight bytes in t starting at offset i. t needs at least read-capability rd.

raises Invalid_argument
if t is too small.

val set_uint16 : 'a wr t -> int -> uint16 -> unit

set_uint16 t i v sets the two bytes in t starting at offset i to the value v. t needs at least write-capability wr.

raises Invalid_argument
if t is too small.

val set_uint32 : 'a wr t -> int -> uint32 -> unit

set_uint32 t i v sets the four bytes in t starting at offset i to the value v. t needs at least write-capability wr.

raises Invalid_argument
if t is too small.

val set_uint64 : 'a wr t -> int -> uint64 -> unit

set_uint64 t i v sets the eight bytes in t starting at offset i to the value v. t needs at least write-capability wr.

raises Invalid_argument
if t is too small.