- Initial commit

Runtime/Shared/Streams/PeekableIncomingSegmentStream.cs

@@ -0,0 +1,32 @@
+namespace Best.HTTP.Shared.Streams
+{
+    public sealed class PeekableIncomingSegmentStream : PeekableStream
+    {
+        private int peek_listIdx;
+        private int peek_pos;
+
+        public override void BeginPeek()
+        {
+            peek_listIdx = 0;
+            peek_pos = base.bufferList.Count > 0 ? base.bufferList[0].Offset : 0;
+        }
+
+        public override int PeekByte()
+        {
+            if (base.bufferList.Count == 0)
+                return -1;
+
+            var segment = base.bufferList[this.peek_listIdx];
+            if (peek_pos >= segment.Offset + segment.Count)
+            {
+                if (base.bufferList.Count <= this.peek_listIdx + 1)
+                    return -1;
+
+                segment = base.bufferList[++this.peek_listIdx];
+                this.peek_pos = segment.Offset;
+            }
+
+            return segment.Data[this.peek_pos++];
+        }
+    }
+}