1 files changed, 10 insertions, 4 deletions

diff --git a/src/chunker.rs b/src/chunker.rs
index f424833..eeeed8d 100644
--- a/src/chunker.rs
+++ b/src/chunker.rs
@@ -2,29 +2,32 @@ use crate::checksummer::sha256;
 use crate::chunk::DataChunk;
 use crate::chunkmeta::ChunkMeta;
 use std::io::prelude::*;
+use std::path::{Path, PathBuf};
 
 pub struct Chunker {
     chunk_size: usize,
     buf: Vec<u8>,
+    filename: PathBuf,
     handle: std::fs::File,
 }
 
 #[derive(Debug, thiserror::Error)]
 pub enum ChunkerError {
-    #[error(transparent)]
-    IoError(#[from] std::io::Error),
+    #[error("failed to read file {0}: {1}")]
+    FileRead(PathBuf, std::io::Error),
 }
 
 pub type ChunkerResult<T> = Result<T, ChunkerError>;
 
 impl Chunker {
-    pub fn new(chunk_size: usize, handle: std::fs::File) -> Self {
+    pub fn new(chunk_size: usize, handle: std::fs::File, filename: &Path) -> Self {
         let mut buf = vec![];
         buf.resize(chunk_size, 0);
         Self {
             chunk_size,
             buf,
             handle,
+            filename: filename.to_path_buf(),
         }
     }
 
@@ -32,7 +35,10 @@ impl Chunker {
         let mut used = 0;
 
         loop {
-            let n = self.handle.read(&mut self.buf.as_mut_slice()[used..])?;
+            let n = self
+                .handle
+                .read(&mut self.buf.as_mut_slice()[used..])
+                .map_err(|err| ChunkerError::FileRead(self.filename.to_path_buf(), err))?;
             used += n;
             if n == 0 || used == self.chunk_size {
                 break;