refactor: remove redundant copy method from CompressionEngine implementations

src/compression/gzip.rs

@@ -41,12 +41,6 @@ impl CompressionEngine for CompressionEngineGZip {
         Ok(Box::new(AutoFinishGzEncoder::new(gzip_write)))
     }
 
-    fn copy(&self, file_path: PathBuf, writer: &mut dyn Write) -> Result<()> {
-        let mut reader = self.open(file_path)?;
-        io::copy(&mut reader, writer)?;
-        writer.flush()?;
-        Ok(())
-    }
 }
 
 pub struct AutoFinishGzEncoder<W: Write> {

src/compression/lz4.rs

@@ -40,11 +40,5 @@ impl CompressionEngine for CompressionEngineLZ4 {
         Ok(Box::new(lz4_write))
     }
 
-    fn copy(&self, file_path: PathBuf, writer: &mut dyn Write) -> Result<()> {
-        let mut reader = self.open(file_path)?;
-        io::copy(&mut reader, writer)?;
-        writer.flush()?;
-        Ok(())
-    }
 }
 

src/compression/none.rs

@@ -32,10 +32,4 @@ impl CompressionEngine for CompressionEngineNone {
         Ok(Box::new(File::create(file_path)?))
     }
 
-    fn copy(&self, file_path: PathBuf, writer: &mut dyn Write) -> Result<()> {
-        let mut reader = self.open(file_path)?;
-        io::copy(&mut reader, writer)?;
-        writer.flush()?;
-        Ok(())
-    }
 }

src/compression/program.rs

@@ -79,12 +79,6 @@ impl CompressionEngine for CompressionEngineProgram {
         Ok(Box::new(process.stdin.unwrap()))
     }
 
-    fn copy(&self, file_path: PathBuf, writer: &mut dyn Write) -> Result<()> {
-        let mut reader = self.open(file_path)?;
-        io::copy(&mut reader, writer)?;
-        writer.flush()?;
-        Ok(())
-    }
 }
 
 fn get_program_path(program: &str) -> Result<String> {