feat: add custom erorr

src/util.rs

@@ -1,5 +1,24 @@
+use std::fs;
 use sha2::{  Digest, Sha256 };
 
+quick_error! {
+    #[derive(Debug)]
+    pub enum DigestError {
+        FileOpenError(f: String, m: String) {
+            display("Read file: {}, failed: {}", f, m)
+        }
+    }
+}
+
+// pub type XResult<T> = Result<T, Box<dyn std::error::Error>>;
+
+pub fn digest_file_sha256(file: &str) -> Result<Vec<u8>, DigestError> {
+    let bs = match fs::read(file) {
+        Ok(bs) => bs, Err(e) => return Err(DigestError::FileOpenError(file.into(), e.to_string())),
+    };
+    Ok(digest_sha256(&bs))
+}
+
 pub fn digest_sha256(bs: &[u8]) -> Vec<u8> {
     let mut sha256 = Sha256::new();
     sha256.update(bs);