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137 lines
4.1 KiB
Rust
137 lines
4.1 KiB
Rust
use super::*;
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use crate::preproc::rga_preproc;
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use failure::*;
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use lazy_static::lazy_static;
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use std::path::PathBuf;
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static EXTENSIONS: &[&str] = &["tgz", "tbz", "tbz2", "gz", "bz2", "xz", "zst"];
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static MIME_TYPES: &[&str] = &[
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"application/gzip",
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"application/x-bzip",
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"application/x-xz",
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"application/zstd",
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];
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lazy_static! {
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static ref METADATA: AdapterMeta = AdapterMeta {
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name: "decompress".to_owned(),
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version: 1,
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description:
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"Reads compressed file as a stream and runs a different extractor on the contents."
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.to_owned(),
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fast_matchers: EXTENSIONS
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.iter()
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.map(|s| FastMatcher::FileExtension(s.to_string()))
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.collect(),
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slow_matchers: Some(
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MIME_TYPES
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.iter()
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.map(|s| SlowMatcher::MimeType(s.to_string()))
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.collect()
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),
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};
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}
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#[derive(Default)]
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pub struct DecompressAdapter;
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impl DecompressAdapter {
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pub fn new() -> DecompressAdapter {
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DecompressAdapter
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}
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}
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impl GetMetadata for DecompressAdapter {
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fn metadata(&self) -> &AdapterMeta {
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&METADATA
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}
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}
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fn decompress_any<'a, R>(reason: &SlowMatcher, inp: &'a mut R) -> Fallible<Box<dyn Read + 'a>>
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where
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R: Read,
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{
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use FastMatcher::*;
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use SlowMatcher::*;
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let gz = |inp: &'a mut R| Box::new(flate2::read::MultiGzDecoder::new(inp));
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let bz2 = |inp: &'a mut R| Box::new(bzip2::read::BzDecoder::new(inp));
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let xz = |inp: &'a mut R| Box::new(xz2::read::XzDecoder::new_multi_decoder(inp));
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let zst = |inp: &'a mut R| zstd::stream::read::Decoder::new(inp); // returns result
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Ok(match reason {
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Fast(FileExtension(ext)) => match ext.as_ref() {
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"tgz" | "gz" => gz(inp),
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"tbz" | "tbz2" | "bz2" => bz2(inp),
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"xz" => xz(inp),
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"zst" => Box::new(zst(inp)?),
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ext => Err(format_err!("don't know how to decompress {}", ext))?,
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},
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MimeType(mime) => match mime.as_ref() {
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"application/gzip" => gz(inp),
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"application/x-bzip" => bz2(inp),
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"application/x-xz" => xz(inp),
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"application/zstd" => Box::new(zst(inp)?),
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mime => Err(format_err!("don't know how to decompress mime {}", mime))?,
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},
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})
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}
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fn get_inner_filename(filename: &Path) -> PathBuf {
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let extension = filename
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.extension()
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.map(|e| e.to_string_lossy().to_owned())
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.unwrap_or(Cow::Borrowed(""));
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let stem = filename
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.file_stem()
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.expect("no filename given?")
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.to_string_lossy();
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let new_extension = match extension.to_owned().as_ref() {
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"tgz" | "tbz" | "tbz2" => ".tar",
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_other => "",
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};
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filename.with_file_name(format!("{}{}", stem, new_extension))
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}
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impl FileAdapter for DecompressAdapter {
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fn adapt(&self, ai: AdaptInfo, detection_reason: &SlowMatcher) -> 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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archive_recursion_depth,
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config,
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..
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} = ai;
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let mut decompress = decompress_any(detection_reason, &mut inp)?;
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let ai2: AdaptInfo = AdaptInfo {
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filepath_hint: &get_inner_filename(filepath_hint),
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is_real_file: false,
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archive_recursion_depth: archive_recursion_depth + 1,
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inp: &mut decompress,
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oup,
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line_prefix,
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config: config.clone(),
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};
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rga_preproc(ai2)?;
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_inner_filename() {
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for (a, b) in &[
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("hi/test.tgz", "hi/test.tar"),
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("hi/hello.gz", "hi/hello"),
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("a/b/initramfs", "a/b/initramfs"),
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("hi/test.tbz2", "hi/test.tar"),
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("hi/test.tbz", "hi/test.tar"),
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("hi/test.hi.bz2", "hi/test.hi"),
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("hello.tar.gz", "hello.tar"),
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] {
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assert_eq!(get_inner_filename(&PathBuf::from(a)).to_string_lossy(), *b);
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}
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}
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}
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