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use flake

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/target
/Cargo.lock
.direnv
.idea

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[package]
name = "byte_lamination"
version = "0.1.0"
edition = "2021"
authors = ["Olivier 'reivilibre'"]
repository = "https://git.emunest.net/reivilibre/byte_lamination.git"
license = "MIT OR Apache-2.0"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
zstd = { version = "0.12.3", optional = true }
serde = { version = "1.0.162", optional = true }
serde_cbor = { version = "0.11.2", optional = true }
serde_bare = { version = "0.5.0", optional = true }
[features]
# zstd: implicit by optional dep
cbor = ["serde_cbor", "serde"]
bare = ["serde_bare", "serde"]
all = ["zstd", "cbor", "bare"]

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MIT License
Copyright (c) 2022 Olivier 'reivilibre'
Permission is hereby granted, free of charge, to any person obtaining a copy
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# `byte_lamination`
A Rust library ('crate') providing type-readable byte transformation wrappers.
## Licence
Licensed under either of
* Apache Licence, Version 2.0
([LICENSE.Apache2](LICENSE.Apache2) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT Licence
([LICENSE.MIT](LICENSE.MIT) or http://opensource.org/licenses/MIT)
at your option.
## Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 licence, shall be
dual licensed as above, without any additional terms or conditions.

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{
"nodes": {
"nixpkgs": {
"locked": {
"lastModified": 1677075010,
"narHash": "sha256-X+UmR1AkdR//lPVcShmLy8p1n857IGf7y+cyCArp8bU=",
"path": "/nix/store/b1vy558z7lxph5mbg7n50b5njp393ia9-source",
"rev": "c95bf18beba4290af25c60cbaaceea1110d0f727",
"type": "path"
},
"original": {
"id": "nixpkgs",
"type": "indirect"
}
},
"root": {
"inputs": {
"nixpkgs": "nixpkgs",
"utils": "utils"
}
},
"systems": {
"locked": {
"lastModified": 1681028828,
"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
"owner": "nix-systems",
"repo": "default",
"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
"type": "github"
},
"original": {
"owner": "nix-systems",
"repo": "default",
"type": "github"
}
},
"utils": {
"inputs": {
"systems": "systems"
},
"locked": {
"lastModified": 1681202837,
"narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "cfacdce06f30d2b68473a46042957675eebb3401",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
}
},
"root": "root",
"version": 7
}

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{
description = "byte_lamination";
inputs = {
utils.url = "github:numtide/flake-utils";
};
outputs = { self, nixpkgs, utils }:
utils.lib.eachDefaultSystem (system: let
pkgs = nixpkgs.legacyPackages."${system}";
in rec {
# `nix develop`
devShell = pkgs.mkShell {
nativeBuildInputs =
let
rust-toolchain = pkgs.symlinkJoin {
name = "rust-toolchain";
paths = with pkgs; [rustc cargo rustfmt rustPlatform.rustcSrc];
};
in
[
rust-toolchain
];
};
});
}

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#[cfg(feature = "zstd")]
pub mod zstd;

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use std::borrow::Cow;
use std::cmp::max;
use std::error::Error;
use std::marker::PhantomData;
use crate::{AutoDelaminate, AutoLaminate, ByteLamination};
pub struct Zstd<'a, T> {
bytes: Cow<'a, [u8]>,
_marker: PhantomData<T>,
}
impl<'a, T> From<Cow<'a, [u8]>> for Zstd<'a, T> {
fn from(bytes: Cow<'a, [u8]>) -> Self {
Self {
bytes,
_marker: PhantomData::default(),
}
}
}
impl<'a, T> Into<Cow<'a, [u8]>> for Zstd<'a, T> {
fn into(self) -> Cow<'a, [u8]> {
self.bytes
}
}
impl<'a, T> ByteLamination<'a> for Zstd<'a, T> {}
/// Default Zstd compression level used for the AutoLaminate helper.
pub const DEFAULT_ZSTD_LEVEL: i32 = 12;
/// Default memory limit for Zstd decompression used for the AutoDelaminate helper (multiplier of
/// input size).
pub const DEFAULT_MEMORY_LIMIT_MULTIPLIER: usize = 16;
/// Default minimum memory limit for Zstd decompression used for the AutoDelaminate helper.
pub const DEFAULT_MEMORY_LIMIT_MINIMUM: usize = 1024 * 1024 * 1024;
impl<T> Zstd<'static, T> {
pub fn compress(bytes: &[u8], level: i32) -> Result<Self, Box<dyn Error>> {
let compresed_vec = zstd::bulk::compress(bytes, level)?;
Ok(Self::from(Cow::Owned(compresed_vec)))
}
}
impl<'a, T> Zstd<'a, T> {
pub fn decompress(&self, memory_limit: usize) -> Result<Vec<u8>, Box<dyn Error>> {
let decompressed_vec = zstd::bulk::decompress(&self.bytes, memory_limit)?;
Ok(decompressed_vec)
}
}
impl<'a, T: AutoLaminate<U> + ByteLamination<'a>, U> AutoLaminate<U> for Zstd<'a, T> {
fn laminate(item: U) -> Result<Self, Box<dyn Error>> {
let bytes: Cow<'a, [u8]> = T::laminate(item)?.into();
Zstd::compress(&bytes, DEFAULT_ZSTD_LEVEL)
}
}
impl<'a, T: AutoDelaminate<U> + ByteLamination<'a>, U> AutoDelaminate<U> for Zstd<'a, T> {
fn delaminate(self) -> Result<U, Box<dyn Error>> {
let memory_limit = max(DEFAULT_MEMORY_LIMIT_MINIMUM, DEFAULT_MEMORY_LIMIT_MULTIPLIER * self.bytes.len());
let bytes = self.decompress(memory_limit)?;
T::from(Cow::Owned(bytes)).delaminate()
}
}

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//! A framework for 'layered' wrappers for byte transformations.
//!
//! This crate provides a framework for writing nested wrappers that operate on bytes, performing
//! operations like en/decryption, (de)compression and (de)serialisation.
//!
//! The end result might allows you to write something like e.g. `SymLockBox<Zstd<>>`.
//!
//! The crate comes built in with a few wrappers, enableable using Cargo features:
//! - `zstd`: [Zstd compression](compression::zstd)
//! - `cbor`: [CBOR serialisation](serialisation::cbor), compatible with serde.
//! - `bare`: [BARE serialisation](serialisation::bare), compatible with serde.
//!
//! No encryption wrappers have been included yet because it would be irresponsible to include
//! unaudited cryptographic tools.
use std::borrow::Cow;
use std::error::Error;
pub mod compression;
pub mod serialisation;
/// Helper trait for when it's possible to construct a lamination without any extra inputs at any
/// steps.
pub trait AutoLaminate<T>: Sized {
fn laminate(item: T) -> Result<Self, Box<dyn Error>>;
}
/// Helper trait for when it's possible to deconstruct a lamination without any extra inputs at any
/// steps.
pub trait AutoDelaminate<T> {
fn delaminate(self) -> Result<T, Box<dyn Error>>;
}
/// Helper trait for when it's possible to deconstruct a lamination without any extra inputs at any
/// steps.
/// This variant only borrows the input.
///
/// **EXPERIMENTAL** — may be removed in the future if this does not turn out to be ergonomic.
pub trait AutoDelaminateBorrowed<'a, T> {
fn delaminate(&'a self) -> Result<T, Box<dyn Error>>;
}
pub trait ByteLamination<'a>: From<Cow<'a, [u8]>> + Into<Cow<'a, [u8]>> {
}

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#[cfg(feature = "cbor")]
pub mod cbor;
#[cfg(feature = "bare")]
pub mod bare;

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use std::borrow::Cow;
use std::error::Error;
use std::marker::PhantomData;
use serde::Serialize;
use serde::de::DeserializeOwned;
use crate::{AutoDelaminate, AutoLaminate, ByteLamination};
/// Wrapper that uses serde to perform BARE serialisation on an arbitrary type.
pub struct SerdeBare<'a, T> {
bytes: Cow<'a, [u8]>,
_marker: PhantomData<T>,
}
impl<'a, T> From<Cow<'a, [u8]>> for SerdeBare<'a, T> {
fn from(bytes: Cow<'a, [u8]>) -> Self {
Self {
bytes,
_marker: PhantomData::default(),
}
}
}
impl<'a, T> Into<Cow<'a, [u8]>> for SerdeBare<'a, T> {
fn into(self) -> Cow<'a, [u8]> {
self.bytes
}
}
impl<'a, T> ByteLamination<'a> for SerdeBare<'a, T> {}
impl<'a, T: Serialize> SerdeBare<'a, T> {
pub fn serialise<'inp>(inner: &'inp T) -> Result<Self, Box<dyn Error>> {
let cbor_bytes = serde_bare::to_vec(inner)?;
Ok(Self::from(Cow::Owned(cbor_bytes)))
}
}
impl<'a, T: DeserializeOwned> SerdeBare<'a, T> {
pub fn deserialise(&'a self) -> Result<T, Box<dyn Error>> {
let deser_t = serde_bare::from_slice(&self.bytes)?;
Ok(deser_t)
}
}
impl<'a, T: Serialize> AutoLaminate<T> for SerdeBare<'a, T> {
fn laminate(item: T) -> Result<Self, Box<dyn Error>> {
Self::serialise(&item)
}
}
impl<'a, T: Serialize> AutoLaminate<&T> for SerdeBare<'a, T> {
fn laminate(item: &T) -> Result<Self, Box<dyn Error>> {
Self::serialise(item)
}
}
impl<'a, T: DeserializeOwned> AutoDelaminate<T> for SerdeBare<'a, T> {
fn delaminate(self) -> Result<T, Box<dyn Error>> {
self.deserialise()
}
}

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use std::borrow::Cow;
use std::error::Error;
use std::marker::PhantomData;
use serde::{Deserialize, Serialize};
use serde::de::DeserializeOwned;
use crate::{AutoDelaminate, AutoDelaminateBorrowed, AutoLaminate, ByteLamination};
/// Wrapper that uses serde to perform CBOR serialisation on an arbitrary type.
pub struct SerdeCbor<'a, T> {
bytes: Cow<'a, [u8]>,
_marker: PhantomData<T>,
}
impl<'a, T> From<Cow<'a, [u8]>> for SerdeCbor<'a, T> {
fn from(bytes: Cow<'a, [u8]>) -> Self {
Self {
bytes,
_marker: PhantomData::default(),
}
}
}
impl<'a, T> Into<Cow<'a, [u8]>> for SerdeCbor<'a, T> {
fn into(self) -> Cow<'a, [u8]> {
self.bytes
}
}
impl<'a, T> ByteLamination<'a> for SerdeCbor<'a, T> {}
impl<'a, T: Serialize> SerdeCbor<'a, T> {
pub fn serialise<'inp>(inner: &'inp T) -> Result<Self, Box<dyn Error>> {
let cbor_bytes = serde_cbor::to_vec(inner)?;
Ok(Self::from(Cow::Owned(cbor_bytes)))
}
}
impl<'a, T: Deserialize<'a>> SerdeCbor<'a, T> {
pub fn deserialise(&'a self) -> Result<T, Box<dyn Error>> {
let deser_t = serde_cbor::from_slice(&self.bytes)?;
Ok(deser_t)
}
}
impl<'a, T: Serialize> AutoLaminate<T> for SerdeCbor<'a, T> {
fn laminate(item: T) -> Result<Self, Box<dyn Error>> {
Self::serialise(&item)
}
}
impl<'a, T: Serialize> AutoLaminate<&T> for SerdeCbor<'a, T> {
fn laminate(item: &T) -> Result<Self, Box<dyn Error>> {
Self::serialise(item)
}
}
impl<'a, T: DeserializeOwned> AutoDelaminate<T> for SerdeCbor<'a, T> {
fn delaminate(self) -> Result<T, Box<dyn Error>> {
self.deserialise()
}
}
impl<'a, T: Deserialize<'a>> AutoDelaminateBorrowed<'a, T> for SerdeCbor<'a, T> {
fn delaminate(&'a self) -> Result<T, Box<dyn Error>> {
self.deserialise()
}
}