initial commit

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I4a6b498153eccd5407510dd541b7f4816a6a6964

crates/pinakes-core/src/hash.rs

@@ -0,0 +1,31 @@
+use std::path::Path;
+
+use crate::error::Result;
+use crate::model::ContentHash;
+
+const BUFFER_SIZE: usize = 65536;
+
+pub async fn compute_file_hash(path: &Path) -> Result<ContentHash> {
+    let path = path.to_path_buf();
+    let hash = tokio::task::spawn_blocking(move || -> Result<ContentHash> {
+        let mut hasher = blake3::Hasher::new();
+        let mut file = std::fs::File::open(&path)?;
+        let mut buf = vec![0u8; BUFFER_SIZE];
+        loop {
+            let n = std::io::Read::read(&mut file, &mut buf)?;
+            if n == 0 {
+                break;
+            }
+            hasher.update(&buf[..n]);
+        }
+        Ok(ContentHash::new(hasher.finalize().to_hex().to_string()))
+    })
+    .await
+    .map_err(|e| crate::error::PinakesError::Io(std::io::Error::other(e)))??;
+    Ok(hash)
+}
+
+pub fn compute_hash_sync(data: &[u8]) -> ContentHash {
+    let hash = blake3::hash(data);
+    ContentHash::new(hash.to_hex().to_string())
+}