quaint summit
Apologies for the simple question...
My goal is to write a program that accepts a directory as input, iterates over two files at a time, and whenever a byte matches between the two it writes that byte to the same position in a new file and otherwise it writes "\x00".
Simple example: A directory has files A == b41 aa ab and B == b41 fa fb, then the program would create a file with the content b41 00 00
I am using Vecs and zip to accomplish this like so:
1 use std::io::{Result,Seek};
2 use std::io::prelude::*; // Required for file.read_to_end
3 use std::fs::{read_dir,File};
4
5 fn main() -> Result<()> {
6 let mut file = File::create("./result.bin")?;
7 let paths = read_dir("./test").unwrap(); // Make the dir a cli arg. Use ./test dir for now
8
9 for path in paths {
10 let mut new_buffer = Vec::new();
11 let mut new_file = File::open(path.unwrap().path())?;
12 new_file.read_to_end(&mut new_buffer)?;
13
14 let mut old_buffer = Vec::new();
15 let mut old_file = File::open("./output.bin")?; // Example file containing `41 fa fb`
16 old_file.read_to_end(&mut old_buffer)?;
17
18 // Use zip to iterate over both buffers
19 old_buffer.iter().zip(&new_buffer).filter(|&(old, new)| {
20 if old == new {
21 file.write(new).unwrap();
22 } else {
23 file.write(b"\x00").unwrap();
24 }
25 return true;
26 });
27 file.rewind()?;
28 }
29 Ok(())
30 }
When I try to cargo build, I get the error:
error[E0308]: mismatched types
--> src/main.rs:21:20
|
21 | file.write(new).unwrap();
| ^^^ expected slice `[u8]`, found `u8`
|
= note: expected reference `&[u8]`
found reference `&u8`
I've tried several different things to get this to work, but I had that using new.to_vec() would have worked. Can I get a nudge in the correction to write the byte of interest to a file?
heady zealot