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// the code here is taken (and slightly modified) from https://github.com/XadillaX/crlf2lf
//
// convert CRLF (0D 0A) to LF ( 0A )
//
use std::fs::File;
use std::io::prelude::*;
use std::io::{self, Read};
use std::path::Path;
// The caller has to make sure that crlf2lf is only
// used for text files
pub fn crlf2lf(fname: &str) -> Result<(), io::Error> {
let path = Path::new(fname);
let mut hdl_in;
match File::open(path) {
Ok(f) => {
hdl_in = f;
}
Err(e) => return Err(e),
};
let mut buffer: Vec<u8> = Vec::new();
// read the whole file
if let Err(e) = hdl_in.read_to_end(&mut buffer) {
return Err(e);
};
// convert \r\n to \n
let mut another_vec: Vec<u8> = Vec::new();
const CR: u8 = 0x0d; // 13
const LF: u8 = 0x0a; // 10
for i in 0..buffer.len() {
if buffer[i] == CR {
if i < buffer.len() - 1 && buffer[i + 1] == LF {
continue;
}
if i > 0 && buffer[i - 1] == LF {
continue;
}
}
another_vec.push(buffer[i]);
}
let mut hdl_out;
match File::create(path) {
Ok(f) => {
hdl_out = f;
}
Err(e) => return Err(e),
};
// write back
match hdl_out.write(&another_vec) {
Ok(_) => Ok(()),
Err(e) => Err(e),
}
}
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