Upgrade `magic-sys` to v0.4

[robo9k]

There's already an automated pull request #394
but this requires some additional manual changes

This crate should start using/exposing features:

• https://docs.rs/magic-sys/0.4.1/magic_sys/index.html#libmagic-api-features
• maybe https://docs.rs/magic-sys/0.4.1/magic_sys/index.html#build-features

Possibly using names such as "libmagic+v5-45"

Docs should be built for the latest libmagic, maybe using robo9k/rust-magic-sys#161 maybe cargo docs-rs
Likely sufficient to continue just building for latest on Linux instead of matrix

References might need to be updated for minimum v5.39 instead of v5(.00)

Other things I did not think of yet..

This upgrade should not yet include 100% API coverage, e.g. params

It is likely semver breaking and possibly MSRV bumping

[robo9k]

Could take a look at how upgrades would work for dependents, e.g.

• https://github.com/LawnGnome/mojique
• https://github.com/VirusTotal/yara-x
• https://github.com/theseus-rs/file-type (benchmarks)
• https://github.com/malwaredb/malwaredb-rs
• https://github.com/praetorian-inc/noseyparker

More dependents of magic-sys:

• https://github.com/robo9k/rust-magic-sys/network/dependents
• https://crates.io/crates/magic-sys/reverse_dependencies

[robo9k]

Feature "libmagic+v5-40"
https://docs.rs/magic-sys/0.4.1/magic_sys/index.html#libmagic-v540

• Parameters are not implemented at all yet, no change needed for MAGIC_PARAM_ENCODING_MAX

Feature "libmagic+v5-44"
https://docs.rs/magic-sys/0.4.1/magic_sys/index.html#libmagic-v544

• Should add MAGIC_NO_COMPRESS_FORK as magic::cookie::Flags::NO_COMPRESS_FORK

Feature "libmagic+v5-45"
https://docs.rs/magic-sys/0.4.1/magic_sys/index.html#libmagic-v545

• Should add MAGIC_NO_CHECK_SIMH as magic::cookie::Flags::NO_CHECK_SIMH
• Parameters are not implemented at all yet, no change needed for MAGIC_PARAM_ELF_SHSIZE_MAX
• Include, for this feature/version onward, new Flags::NO_CHECK_SIMH in Flags::NO_CHECK_BUILTIN

---

README(-crate).md and/or lib.rs crate rustdoc should include new feature flags, compare with magic-sys

MAGIC_NO_CHECK_BUILTIN ORs other flags and gets added to in new libmagic versions, so it's important to use the matching crate version feature for the libmagic version one is using

[robo9k]

The automated release MR e.g. #411 lists this as "API-compatible", but the magic-sys major version upgrade is a potentially breaking change for our users

The CHANGELOG for magic@0.17.0 should probably link to https://github.com/robo9k/rust-magic-sys/blob/main/CHANGELOG.md#040---2025-07-31
and mention the new "libmagic+v5.nn" features

[ikrivosheev]

@robo9k Can we close the issue or I forget something?

[robo9k]

There's now magic-sys@0.4.3 as well #437
https://crates.io/crates/magic-sys/versions