MoonBit crc32: provide simple crc32 hash algorithm.

crc32

hash

algorithm

moonbit

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Author

gmlewis

Version

0.9.2

License

Apache-2.0

Repository

github.com/gmlewis/moonbit-crc32

Last updated

yesterday

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#gmlewis/crc32

This is a simple crc32 hash algorithm based on the Go Rosetta Stone implementation found here: https://rosettacode.org/wiki/CRC-32 which has the copyright notice:

Content is available under GNU Free Document License 1.3 unless otherwise noted.

#Status

The code has been updated to support compiler:

$ moon version --all
moon 0.1.20261016 (1af328f 2026-10-16) ~/.moon/bin/moon
moonc v0.10.16+b1a0e846e (2026-10-16) ~/.moon/bin/moonc
moonrun 0.1.20261016 (1af328f 2026-10-16) ~/.moon/bin/moonrun

HashFunc

source

pub(open) trait HashFunc {
  fn name(Self) -> String
  fn reset(Self) -> Unit
  fn size(Self) -> Int
  fn write(Self, Byte) -> Unit
  fn check_sum(Self) -> String
}

HashFunc represents a hash algorithm like @crc32, @md5, or @sha256.

A HashFunc can be injected into other packages as a trait object (&HashFunc), which lets a caller feed data to an algorithm it does not know statically, reuse that algorithm across inputs via reset, and identify it at runtime via name.

Implementers in other packages should declare the promotion explicitly. Promoting a trait's methods to inherent methods is deprecated (moonc warns implicit_impl_as_method), so a foreign implementation also needs a declaration such as: pub extend MyDigest with @crc32.HashFunc::{name, reset, size, write, check_sum}

Digest

source

pub(all) struct Digest {
  crc : UInt
  name : String
}

@crc32.Digest implements the 32-bit cyclic redundancy check, or CRC-32, checksum. See https://en.wikipedia.org/wiki/Cyclic_redundancy_check for information. This package is based on the Go Rosetta Stone implementation found here: https://rosettacode.org/wiki/CRC-32

impl HashFunc for Digest

fn check_sum(self : Digest) -> String

source

check_sum returns the final crc32 as a hex string.

fn name(self : Digest) -> String

source

fn reset(self : Digest) -> Unit

source

reset returns the digest to its initial state, ready to sum again.

fn size(_self : Digest) -> Int

source

size is the crc32 digest size in bytes.

fn write(self : Digest, b : Byte) -> Unit

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write writes a byte to the digest.

Digest::check_sum

source

fn Digest::check_sum(self : Digest) -> String

Digest::digest

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fn Digest::digest(self : Digest) -> UInt

digest returns the final crc32 as a UInt.

Digest::name

source

fn Digest::name(self : Digest) -> String

Digest::new

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fn Digest::new() -> Digest

Digest::new returns a new, reset Digest, ready to sum.

Digest::reset

source

fn Digest::reset(self : Digest) -> Unit

Digest::size

source

fn Digest::size(_self : Digest) -> Int

Digest::write

source

fn Digest::write(self : Digest, b : Byte) -> Unit

Source Files

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crc32

#gmlewis/crc32

#Status

#HashFunc

#Digest

#Digest::check_sum

#Digest::digest

#Digest::name

#Digest::new

#Digest::reset

#Digest::size

#Digest::write

Source Files

HashFunc

Digest

Digest::check_sum

Digest::digest

Digest::name

Digest::new

Digest::reset

Digest::size

Digest::write