From 89d0a2b2d708daf9823c19e9d9476319a739537b Mon Sep 17 00:00:00 2001
From: Stepan Usatiuk <stepan@usatiuk.com>
Date: Tue, 18 Jun 2024 22:55:40 +0200
Subject: [PATCH] fix for reading empty files

---
 .../dhfs/storage/files/service/DhfsFileServiceImpl.java   | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/server/src/main/java/com/usatiuk/dhfs/storage/files/service/DhfsFileServiceImpl.java b/server/src/main/java/com/usatiuk/dhfs/storage/files/service/DhfsFileServiceImpl.java
index 6dbe80fa..cd0ac2b1 100644
--- a/server/src/main/java/com/usatiuk/dhfs/storage/files/service/DhfsFileServiceImpl.java
+++ b/server/src/main/java/com/usatiuk/dhfs/storage/files/service/DhfsFileServiceImpl.java
@@ -211,6 +211,10 @@ public class DhfsFileServiceImpl implements DhfsFileService {
         try {
             file.runReadLocked((fsNodeData, fileData) -> {
                 var chunksAll = fileData.getChunks();
+                if (chunksAll.isEmpty()) {
+                    chunksList.set(new ArrayList<>());
+                    return null;
+                }
                 chunksList.set(chunksAll.tailMap(chunksAll.floorKey(offset)).entrySet().stream().toList());
                 return null;
             });
@@ -219,6 +223,10 @@ public class DhfsFileServiceImpl implements DhfsFileService {
             return Optional.empty();
         }
 
+        if (chunksList.get().isEmpty()) {
+            return Optional.of(new byte[0]);
+        }
+
         var chunks = chunksList.get().iterator();
         ByteBuffer buf = ByteBuffer.allocate(length);