Add default traits and open function to CompressionEngine

src/compression/gzip.rs

@@ -1,7 +1,7 @@
 use anyhow::Result;
 use std::fs::File;
 use std::io;
-use std::io::Write;
+use std::io::{Read,Write};
 use std::path::PathBuf;
 use log::*;
 
@@ -25,17 +25,11 @@ impl CompressionEngine for CompressionEngineGZip {
         true
     }
 
-    fn cat(&self, file_path: PathBuf) -> Result<()> {
-        debug!("COMPRESSION: Outputting {:?} to STDOUT using {:?}", file_path, *self);
+    fn open(&self, file_path: PathBuf) -> Result<Box<dyn Read>> {
+        debug!("COMPRESSION: Opening {:?} using {:?}", file_path, *self);
 
-        let mut stdout = io::stdout().lock();
         let file = File::open(file_path)?;
-        let mut gzip_read = GzDecoder::new(file);
-
-        io::copy(&mut gzip_read, &mut stdout)?;
-        stdout.flush()?;
-
-        Ok(())
+        Ok(Box::new(GzDecoder::new(file)))
     }
 
     fn create(&self, file_path: PathBuf) -> Result<Box<dyn Write>> {