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Packages/com.tivadar.best.http/Runtime/Shared/Streams/BufferSegmentStream.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Threading;
+
+using Best.HTTP.Shared.PlatformSupport.Memory;
+
+namespace Best.HTTP.Shared.Streams
+{
+    public class BufferSegmentStream : Stream
+    {
+        public override bool CanRead { get { return true; } }
+
+        public override bool CanSeek { get { return false; } }
+
+        public override bool CanWrite { get { return false; } }
+
+        public override long Length { get { return this._length; } }
+        protected long _length;
+
+        public override long Position { get { return 0; } set { } }
+
+        protected List<BufferSegment> bufferList = new List<BufferSegment>();
+
+        private byte[] _tempByteArray = new byte[1];
+
+        public override int ReadByte()
+        {
+            if (Read(this._tempByteArray, 0, 1) == 0)
+                return -1;
+
+            return this._tempByteArray[0];
+        }
+
+        public override int Read(byte[] buffer, int offset, int count)
+        {
+            int sumReadCount = 0;
+
+            while (count > 0 && bufferList.Count > 0)
+            {
+                BufferSegment buff = this.bufferList[0];
+
+                int readCount = Math.Min(count, buff.Count);
+
+                Array.Copy(buff.Data, buff.Offset, buffer, offset, readCount);
+
+                sumReadCount += readCount;
+                offset += readCount;
+                count -= readCount;
+
+                this.bufferList[0] = buff = buff.Slice(buff.Offset + readCount);
+
+                if (buff.Count == 0)
+                {
+                    this.bufferList.RemoveAt(0);
+                    BufferPool.Release(buff.Data);
+                }
+            }
+
+            Interlocked.Add(ref this._length, -sumReadCount);
+
+            return sumReadCount;
+        }
+
+        public override void Write(byte[] buffer, int offset, int count) => Write(new BufferSegment(buffer, offset, count));
+
+        public virtual void Write(BufferSegment bufferSegment)
+        {
+            if (bufferSegment.Count == 0)
+                return;
+
+            this.bufferList.Add(bufferSegment);
+            Interlocked.Add(ref this._length, bufferSegment.Count);
+        }
+
+        public virtual void Reset()
+        {
+            BufferPool.ReleaseBulk(this.bufferList);
+
+            this.bufferList.Clear();
+            Interlocked.Exchange(ref this._length, 0);
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+
+            Reset();
+        }
+
+        public override void Flush() { }
+        public override long Seek(long offset, SeekOrigin origin) => throw new NotImplementedException();
+        public override void SetLength(long value) => throw new NotImplementedException();
+    }
+}