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121 lines
3.6 KiB
Rust
121 lines
3.6 KiB
Rust
use super::*;
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use crate::preproc::rga_preproc;
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use ::tar::EntryType::Regular;
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use failure::*;
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use lazy_static::lazy_static;
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use std::fs::File;
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use std::io::BufReader;
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use std::path::PathBuf;
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static EXTENSIONS: &[&str] = &["tar", "tar.gz", "tar.bz2", "tar.xz", "tar.zst"];
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lazy_static! {
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static ref METADATA: AdapterMeta = AdapterMeta {
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name: "tar".to_owned(),
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version: 1,
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matchers: EXTENSIONS
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.iter()
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.map(|s| Matcher::FileExtension(s.to_string()))
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.collect(),
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};
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}
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pub struct TarAdapter;
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impl TarAdapter {
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pub fn new() -> TarAdapter {
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TarAdapter
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}
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}
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impl GetMetadata for TarAdapter {
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fn metadata<'a>(&'a self) -> &'a AdapterMeta {
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&METADATA
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}
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}
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// make a &mut Read into a owned Read because the streaming decompressors want to take ownership of their base Reads
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struct WrapRead<'a> {
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inner: &'a mut dyn Read,
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}
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impl<'a> Read for WrapRead<'a> {
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fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
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self.inner.read(buf)
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}
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}
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// feeling a little stupid here. why is this needed at all
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enum SpecRead<R: Read> {
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Gz(flate2::read::MultiGzDecoder<R>),
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Bz2(bzip2::read::BzDecoder<R>),
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Xz(xz2::read::XzDecoder<R>),
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Zst(zstd::stream::read::Decoder<BufReader<R>>),
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Passthrough(R),
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}
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impl<R: Read> Read for SpecRead<R> {
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fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
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use SpecRead::*;
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match self {
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Gz(z) => z.read(buf),
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Bz2(z) => z.read(buf),
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Xz(z) => z.read(buf),
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Zst(z) => z.read(buf),
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Passthrough(z) => z.read(buf),
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}
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}
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}
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// why do I need to wrap the output here in a specific type? is it possible with just a Box<Read> for every type?
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fn decompress_any<'a, R>(filename: &Path, inp: &'a mut R) -> Fallible<SpecRead<WrapRead<'a>>>
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where
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R: Read,
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{
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let inp = WrapRead { inner: inp };
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let extension = filename.extension().map(|e| e.to_string_lossy().to_owned());
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match extension {
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Some(e) => Ok(match e.to_owned().as_ref() {
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"gz" => SpecRead::Gz(flate2::read::MultiGzDecoder::new(inp)),
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"bz2" => SpecRead::Bz2(bzip2::read::BzDecoder::new(inp)),
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"xz" => SpecRead::Xz(xz2::read::XzDecoder::new_multi_decoder(inp)),
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"zst" => SpecRead::Zst(zstd::stream::read::Decoder::new(inp)?),
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"tar" => SpecRead::Passthrough(inp),
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ext => Err(format_err!("don't know how to decompress {}", ext))?,
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}),
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None => Err(format_err!("no extension")),
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}
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}
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impl FileAdapter for TarAdapter {
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fn adapt(&self, ai: AdaptInfo) -> Fallible<()> {
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let AdaptInfo {
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filepath_hint,
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mut inp,
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oup,
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line_prefix,
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..
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} = ai;
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let decompress = decompress_any(filepath_hint, &mut inp)?;
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let mut archive = ::tar::Archive::new(decompress);
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for entry in archive.entries()? {
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let mut file = entry.unwrap();
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let path = PathBuf::from(file.path()?.to_owned());
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eprintln!(
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"{}|{}: {} bytes",
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filepath_hint.display(),
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path.display(),
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file.header().size()?,
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);
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if Regular == file.header().entry_type() {
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let line_prefix = &format!("{}{}: ", line_prefix, path.display());
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let ai2: AdaptInfo = AdaptInfo {
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filepath_hint: &path,
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inp: &mut file,
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oup: oup,
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line_prefix,
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};
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rga_preproc(ai2, None)?;
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}
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}
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Ok(())
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}
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}
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