Bitlib 0️⃣1️⃣0️⃣1️⃣

A simple OCaml library for bit/byte operations. The purpose of this library is to provide aid to users writing binary files, NOT perform bitwise operations on objects in memory.

Example

    // Write a short int (2 bytes) to a binary file
    let bits = to_bits 512 in
    let padded = pad 16 bits in
    let bytes = to_bytes padded 2 in
    write_binary_file bytes "output.byte"

API

to_bits i

Converts an integer, i, to a list of bits.

Signature

    val to_bits : int -> int list

Example

    to_bits 5 => [1;0;1]

pad padding bits

Ensures bits is of length padding, left-padding the list with 0's as needed.

Signature

    val pad : int -> int list -> int list

Example

    padding 8 [1;0;1] => [0;0;0;0;0;1;0;1]

to_bytes bits n

Writes the bit sequence, bits, as a byte sequence of length n. This function assumes bytes are 8 bits.

Signature

    val to_bytes: int list -> int -> int list

Example

    to_bytes (padding 32 (to_bits 256)) 4 => [0;0;1;0]

little_endian_of_int i bytes

Converts an integer, i, to a list of bytes, bytes long, in little endian order.

Signature

    val little_endian_of_int : int -> int -> int list

Example

    little_endian_of_int 5 2 => [0;5]

big_endian_of_int i bytes

Converts an integer, i, to a list of bytes, bytes long, in big endian order.

Signature

    val big_endian_of_int : int -> int -> int list

Example

    big_endian_of_int 5 2 => [5;0]

write_binary_file bytes filename

Creates a binary file named filename and writes the content of bytes to the file.

Signature

    val write_binary_file : int list -> string -> unit

Example

    write_binary_file [0;5] "output.byte"

Contributing

Contributions to bitlib are greatly appreciated! ❤️

Please try to keep its implementation unassuming and configurable. 🙂