| // 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.Buffers; |
| using System.IO; |
| using System.Runtime.InteropServices; |
| using System.Threading; |
| using System.Threading.Tasks; |
| |
| namespace Apache.Arrow |
| { |
| // Helpers to write Memory<byte> to Stream on netstandard |
| internal static partial class StreamExtensions |
| { |
| public static int Read(this Stream stream, Memory<byte> buffer) |
| { |
| if (MemoryMarshal.TryGetArray(buffer, out ArraySegment<byte> array)) |
| { |
| return stream.Read(array.Array, array.Offset, array.Count); |
| } |
| else |
| { |
| byte[] sharedBuffer = ArrayPool<byte>.Shared.Rent(buffer.Length); |
| try |
| { |
| int result = stream.Read(sharedBuffer, 0, buffer.Length); |
| new Span<byte>(sharedBuffer, 0, result).CopyTo(buffer.Span); |
| return result; |
| } |
| finally |
| { |
| ArrayPool<byte>.Shared.Return(sharedBuffer); |
| } |
| } |
| } |
| |
| public static ValueTask<int> ReadAsync(this Stream stream, Memory<byte> buffer, CancellationToken cancellationToken = default) |
| { |
| if (MemoryMarshal.TryGetArray(buffer, out ArraySegment<byte> array)) |
| { |
| return new ValueTask<int>(stream.ReadAsync(array.Array, array.Offset, array.Count, cancellationToken)); |
| } |
| else |
| { |
| byte[] sharedBuffer = ArrayPool<byte>.Shared.Rent(buffer.Length); |
| return FinishReadAsync(stream.ReadAsync(sharedBuffer, 0, buffer.Length, cancellationToken), sharedBuffer, buffer); |
| |
| async ValueTask<int> FinishReadAsync(Task<int> readTask, byte[] localBuffer, Memory<byte> localDestination) |
| { |
| try |
| { |
| int result = await readTask.ConfigureAwait(false); |
| new Span<byte>(localBuffer, 0, result).CopyTo(localDestination.Span); |
| return result; |
| } |
| finally |
| { |
| ArrayPool<byte>.Shared.Return(localBuffer); |
| } |
| } |
| } |
| } |
| |
| public static void Write(this Stream stream, ReadOnlyMemory<byte> buffer) |
| { |
| if (MemoryMarshal.TryGetArray(buffer, out ArraySegment<byte> array)) |
| { |
| stream.Write(array.Array, array.Offset, array.Count); |
| } |
| else |
| { |
| byte[] sharedBuffer = ArrayPool<byte>.Shared.Rent(buffer.Length); |
| try |
| { |
| buffer.Span.CopyTo(sharedBuffer); |
| stream.Write(sharedBuffer, 0, buffer.Length); |
| } |
| finally |
| { |
| ArrayPool<byte>.Shared.Return(sharedBuffer); |
| } |
| } |
| } |
| |
| public static ValueTask WriteAsync(this Stream stream, ReadOnlyMemory<byte> buffer, CancellationToken cancellationToken = default) |
| { |
| if (MemoryMarshal.TryGetArray(buffer, out ArraySegment<byte> array)) |
| { |
| return new ValueTask(stream.WriteAsync(array.Array, array.Offset, array.Count, cancellationToken)); |
| } |
| else |
| { |
| byte[] sharedBuffer = ArrayPool<byte>.Shared.Rent(buffer.Length); |
| buffer.Span.CopyTo(sharedBuffer); |
| return FinishWriteAsync(stream.WriteAsync(sharedBuffer, 0, buffer.Length, cancellationToken), sharedBuffer); |
| } |
| } |
| |
| private static async ValueTask FinishWriteAsync(Task writeTask, byte[] localBuffer) |
| { |
| try |
| { |
| await writeTask.ConfigureAwait(false); |
| } |
| finally |
| { |
| ArrayPool<byte>.Shared.Return(localBuffer); |
| } |
| } |
| } |
| } |