ZipArchive reuse

src/main.rs

@@ -42,7 +42,10 @@ fn write_file<T: Seek + Write>(
     Ok(())
 }
 
-fn process_files(files: &[PathBuf]) -> Result<(), Box<dyn std::error::Error>> {
+fn process_files<R: Read + Seek>(
+    archive: &mut zip::ZipArchive<R>,
+    files: &[PathBuf],
+) -> Result<(), Box<dyn std::error::Error>> {
     if files.is_empty() {
         return Ok(());
     }
@@ -59,10 +62,6 @@ fn process_files(files: &[PathBuf]) -> Result<(), Box<dyn std::error::Error>> {
         trap: EncoderTrap::Ignore,
     };
 
-    let zip_file = fs::File::open(INPUT_FILENAME)?;
-    let zip_reader = io::BufReader::new(zip_file);
-    let mut archive = zip::ZipArchive::new(zip_reader)?;
-
     let mut outfile = fs::File::create(OUTPUT_FILENAME)?;
     let mut zip_writer = ZipWriter::new(&mut outfile);
 
@@ -105,14 +104,13 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             }
         })
         .collect();
-    drop(archive);
 
     println!("processing {} files...", source_files.len());
 
     source_files.sort();
     let source_files = source_files;
 
-    process_files(&source_files)?;
+    process_files(&mut archive, &source_files)?;
 
     println!("done");
     Ok(())