import quincy 17.2.0

[ceph.git] / ceph / src / arrow / csharp / src / Apache.Arrow / Extensions / StreamExtensions.cs

diff --git a/ceph/src/arrow/csharp/src/Apache.Arrow/Extensions/StreamExtensions.cs b/ceph/src/arrow/csharp/src/Apache.Arrow/Extensions/StreamExtensions.cs
new file mode 100644 (file)
index 0000000..1767d23
--- /dev/null
+++ b/ceph/src/arrow/csharp/src/Apache.Arrow/Extensions/StreamExtensions.cs
@@ -0,0 +1,70 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Apache.Arrow
+{
+    internal static partial class StreamExtensions
+    {
+        public static async ValueTask<int> ReadFullBufferAsync(this Stream stream, Memory<byte> buffer, CancellationToken cancellationToken = default)
+        {
+            int totalBytesRead = 0;
+            do
+            {
+                int bytesRead = 
+                    await stream.ReadAsync(
+                        buffer.Slice(totalBytesRead, buffer.Length - totalBytesRead),
+                        cancellationToken)
+                    .ConfigureAwait(false);
+
+                if (bytesRead == 0)
+                {
+                    // reached the end of the stream
+                    return totalBytesRead;
+                }
+
+                totalBytesRead += bytesRead;
+            }
+            while (totalBytesRead < buffer.Length);
+
+            return totalBytesRead;
+        }
+
+        public static int ReadFullBuffer(this Stream stream, Memory<byte> buffer)
+        {
+            int totalBytesRead = 0;
+            do
+            {
+                int bytesRead = stream.Read(
+                    buffer.Slice(totalBytesRead, buffer.Length - totalBytesRead));
+
+                if (bytesRead == 0)
+                {
+                    // reached the end of the stream
+                    return totalBytesRead;
+                }
+
+                totalBytesRead += bytesRead;
+            }
+            while (totalBytesRead < buffer.Length);
+
+            return totalBytesRead;
+        }
+    }
+}