Are the Archive libraries pure Rust?

[d5364t54ytfr4]

I'm looking for pure Rust alternative to 7-Zip due to worries about security exploits in C, C++ software. I know that this only supports a few formats, but that doesn't matter. Most Archives online are .7z, .zip, .rar. Since these are supported, it'll do for most stuff. If these aren't I can always use 7-Zip as a fall back..

Reason: I notice that when I download Roms many sites, 7-Zip show a warning that some data is left at the end of Archive. I'm worried these may be using exploits in 7-Zip.

So, my question is are all the libraries uses for compression and decompression pure Rust?

[valoq]

Its mostly rust but with some exceptions:

Pure Rust:

    flate2
    brotli
    lz4_flex
    lzma-rust2
    sevenz-rust2
    snap
    tar
    zip
    gzp

C / C++ backed:

    bzip2
    bzip3
    xz2 (liblzma)
    zstd (zstd-sys)
    unrar