src/backup/chunk_stream.rs: add optional chunk_size parameter

src/backup/chunk_store.rs

@@ -42,9 +42,9 @@ pub struct ChunkStore {
 
 // TODO: what about sysctl setting vm.vfs_cache_pressure (0 - 100) ?
 
-pub fn verify_chunk_size(size: u64) -> Result<(), Error> {
+pub fn verify_chunk_size(size: usize) -> Result<(), Error> {
 
-    static SIZES: [u64; 7] = [64*1024, 128*1024, 256*1024, 512*1024, 1024*1024, 2048*1024, 4096*1024];
+    static SIZES: [usize; 7] = [64*1024, 128*1024, 256*1024, 512*1024, 1024*1024, 2048*1024, 4096*1024];
 
     if !SIZES.contains(&size) {
         bail!("Got unsupported chunk size '{}'", size);

src/backup/chunk_stream.rs

@@ -15,8 +15,8 @@ pub struct ChunkStream<S> {
 }
 
 impl <S> ChunkStream<S> {
-    pub fn new(input: S) -> Self {
-        Self { input, chunker: Chunker::new(4 * 1024 * 1024), buffer: BytesMut::new(), scan_pos: 0}
+    pub fn new(input: S, chunk_size: Option<usize>) -> Self {
+        Self { input, chunker: Chunker::new(chunk_size.unwrap_or(4*1024*1024)), buffer: BytesMut::new(), scan_pos: 0}
     }
 }