Write license info from file

src/Tools/tool_helper/src/lib.rs

@@ -3,8 +3,9 @@ use std::{boxed::Box, io::{BufReader, BufWriter, Read, Write}, path::PathBuf};
 pub mod bits;
 pub mod raw;
 
-pub type Output    = Box<dyn Write>;
-pub type Input     = Box<dyn Read>;
+pub type BufferedInputFile = BufReader<std::fs::File>;
+pub type Output            = Box<dyn Write>;
+pub type Input             = Box<dyn Read>;
 
 pub trait ErrorString {
     fn to_string(self) -> String;
@@ -113,11 +114,15 @@ pub fn open_output(output_file: Option<PathBuf>) -> Result<Output, Error> {
 
 pub fn open_input(input_file: Option<PathBuf>) -> Result<Input, Error> {
     match input_file {
-        Some(input_path) => Ok(Box::new(BufReader::new(std::fs::File::open(input_path)?))),
+        Some(input_path) => Ok(Box::new(open_input_file_buffered(&input_path)?)),
         None             => Ok(Box::new(BufReader::new(std::io::stdin()))),
     }
 }
 
+pub fn open_input_file_buffered(input_path: &PathBuf) -> Result<BufferedInputFile, Error> {
+    Ok(BufReader::new(std::fs::File::open(input_path)?))
+}
+
 pub fn os_str_to_string(input: &std::ffi::OsStr, name: &str) -> Result<String, Error> {
     Ok(Error::ok_or_new(input.to_str(), ||format!("Converting {} to UTF-8 failed", name))?.to_owned())
 }