fix: wrong size oshash

packages/server/src/util/oshash.ts

@@ -20,7 +20,18 @@ export async function oshash(
     let hash = BigInt(st.size);
 
     if (st.size < minFileSize){
-        throw new Error("File is too small to hash");
+        // Although the original oshash algorithm should throw an exception, 
+        // just applying the hash function. 
+        const chunk = new Uint8Array(st.size);
+        await fd.read(chunk, 0, st.size, 0);
+        const chunkView = new DataView(chunk.buffer);
+        for (let i = 0; i < Math.floor(st.size / 8) * 8 ; i += 8) {
+            hash += chunkView.getBigUint64(i, true);
+            hash *= 65537n; // 2^16 + 1
+            hash = (hash & 0xFFFFFFFFFFFFFFFFn);
+        }
+        fd.close();
+        return hash;
     }
     
     // read first and last chunk