work r/w loop okey

src/main.rs

@@ -8,6 +8,8 @@ mod work;
 
 mod consts;
 
+pub const BUFSIZE: usize = 4096; // 4kb
+
 fn main() {
     println!("Hello, world!");
 }

src/work.rs

@@ -2,12 +2,19 @@ use super::*;
 use job::Job;
 use std::io::Read;
 
-pub fn work_on(job: &mut Job) -> Result<(), Box<dyn std::error::Error>>
+pub fn work_on(job: &mut Job) -> Result<usize, Box<dyn std::error::Error>>
 {
     let output = job.output_slice();
-    let mut buf = [0u8; 4096];
-    while let Ok(read) = job.read(&mut buf) {
-	//TODO: copy from `job`'s file into `output`.
+    let output = unsafe {
+	// Required because the compiler thinks we're mutably borrowing the same data later on, even though they are unrelated fields of the struct
+	std::slice::from_raw_parts_mut(output.as_mut_ptr(), output.len())
+    };
+    let mut read=0;
+    loop {
+	match job.read(&mut output[read..])? {
+	    0 => break,
+	    current => read+=current,
 	}
-    todo!()
+    }
+    Ok(read)
 }