logsmash/src/logfile/archive/rar.rs

use crate::error::ReadError;
use crate::logfile::archive::{Archive, ArchiveEntry};
use std::borrow::Cow;

pub struct RarArchive {
    path: String,
}

impl RarArchive {
    pub fn new(path: &str) -> Result<Self, ReadError> {
        Ok(RarArchive { path: path.into() })
    }
}

pub struct RarEntry {
    archive: String,
    name: String,
}

impl ArchiveEntry for RarEntry {
    fn name<'a>(&'a self) -> Cow<'a, str> {
        self.name.as_str().into()
    }

    fn extract(self) -> Result<Vec<u8>, ReadError> {
        let mut archive = unrar::Archive::new(&self.archive).open_for_processing()?;
        while let Some(header) = archive.read_header()? {
            if header.entry().filename.to_string_lossy() == self.name {
                return Ok(header.read()?.0);
            }
            archive = header.skip()?;
        }
        Err(ReadError::NoFiles)
    }
}

impl Archive for RarArchive {
    type Entry<'a> = RarEntry;

    fn entries(&mut self) -> impl Iterator<Item = Self::Entry<'_>> {
        unrar::Archive::new(&self.path)
            .open_for_listing()
            .into_iter()
            .flatten()
            .flatten()
            .map(|header| RarEntry {
                archive: self.path.clone(),
                name: header.filename.to_string_lossy().into(),
            })
    }
}