use crate::format::{FileFormat, FileObject};
use anyhow::{bail, Context};
use std::fs::File;
use std::io::BufReader;
use std::path::Path;
pub const XZ_HEADER: &[u8] = &[0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00];
pub struct XZFormat;
impl FileFormat for XZFormat {
fn parse(file: &FileObject) -> anyhow::Result<Self> {
if file.header.starts_with(XZ_HEADER) {
if !file.ext.ends_with(".xz") && !file.ext.ends_with(".lzma") {
tracing::warn!("The file has a xz signature but not a xz extension.");
}
Ok(Self)
} else {
bail!("Not an xz file");
}
}
fn extract(&self, file: &Path, output: &Path) -> anyhow::Result<()> {
if output.is_dir() {
bail!("The given output is a directory");
}
let mut reader = BufReader::new(File::open(&file).context("Opening input file")?);
let mut output = File::create(&output).context("Creating output file")?;
tracing::debug!("Decompressing file {file:?} to output {output:?}");
lzma_rs::xz_decompress(&mut reader, &mut output).context("Decompressing file")?;
Ok(())
}
}