1 files changed, 172 insertions, 0 deletions
diff --git a/Impostor-dev/src/Impostor.Benchmarks/Data/MessageReader_Bytes.cs b/Impostor-dev/src/Impostor.Benchmarks/Data/MessageReader_Bytes.cs
new file mode 100644
index 0000000..2aba724
--- /dev/null
+++ b/Impostor-dev/src/Impostor.Benchmarks/Data/MessageReader_Bytes.cs
@@ -0,0 +1,172 @@
+using System;
+using System.IO;
+using System.Runtime.CompilerServices;
+using System.Text;
+
+namespace Impostor.Benchmarks.Data
+{
+    public class MessageReader_Bytes
+    {
+        public byte Tag { get; }
+        public byte[] Buffer { get; }
+        public int Position { get; set; }
+        public int Length { get; set; }
+        public int BytesRemaining => this.Length - this.Position;
+
+        public MessageReader_Bytes(byte[] buffer, int position = 0, int length = 0)
+        {
+            Tag = byte.MaxValue;
+            Buffer = buffer;
+            Position = position;
+            Length = length;
+        }
+
+        public MessageReader_Bytes(byte tag, byte[] buffer, int position = 0, int length = 0)
+        {
+            Tag = tag;
+            Buffer = buffer;
+            Position = position;
+            Length = length;
+        }
+
+        public MessageReader_Bytes ReadMessage()
+        {
+            var length = ReadUInt16();
+            var tag = FastByte();
+            var pos = Position;
+
+            Position += length;
+            return new MessageReader_Bytes(tag, Buffer, pos, length);
+        }
+
+        public bool ReadBoolean()
+        {
+            byte val = FastByte();
+            return val != 0;
+        }
+
+        public sbyte ReadSByte()
+        {
+            return (sbyte)FastByte();
+        }
+
+        public byte ReadByte()
+        {
+            return FastByte();
+        }
+
+        public ushort ReadUInt16()
+        {
+            return (ushort)(this.FastByte() |
+                            this.FastByte() << 8);
+        }
+
+        public short ReadInt16()
+        {
+            return (short)(this.FastByte() |
+                           this.FastByte() << 8);
+        }
+
+        public uint ReadUInt32()
+        {
+            return this.FastByte()
+                   | (uint)this.FastByte() << 8
+                   | (uint)this.FastByte() << 16
+                   | (uint)this.FastByte() << 24;
+        }
+
+        public int ReadInt32()
+        {
+            return this.FastByte()
+                   | this.FastByte() << 8
+                   | this.FastByte() << 16
+                   | this.FastByte() << 24;
+        }
+
+        public unsafe float ReadSingle()
+        {
+            float output = 0;
+            fixed (byte* bufPtr = &this.Buffer[Position])
+            {
+                byte* outPtr = (byte*)&output;
+
+                *outPtr = *bufPtr;
+                *(outPtr + 1) = *(bufPtr + 1);
+                *(outPtr + 2) = *(bufPtr + 2);
+                *(outPtr + 3) = *(bufPtr + 3);
+            }
+
+            this.Position += 4;
+            return output;
+        }
+
+        public string ReadString()
+        {
+            var len = this.ReadPackedInt32();
+
+            if (this.BytesRemaining < len)
+            {
+                throw new InvalidDataException($"Read length is longer than message length: {len} of {this.BytesRemaining}");
+            }
+
+            var output = Encoding.UTF8.GetString(this.Buffer, Position, len);
+            this.Position += len;
+            return output;
+        }
+
+        public Span<byte> ReadBytesAndSize()
+        {
+            var len = ReadPackedInt32();
+            return ReadBytes(len);
+        }
+
+        public Span<byte> ReadBytes(int length)
+        {
+            var output = Buffer.AsSpan(Position, length);
+            Position += length;
+            return output;
+        }
+
+        public int ReadPackedInt32()
+        {
+            return (int)ReadPackedUInt32();
+        }
+
+        public uint ReadPackedUInt32()
+        {
+            bool readMore = true;
+            int shift = 0;
+            uint output = 0;
+
+            while (readMore)
+            {
+                byte b = FastByte();
+                if (b >= 0x80)
+                {
+                    readMore = true;
+                    b ^= 0x80;
+                }
+                else
+                {
+                    readMore = false;
+                }
+
+                output |= (uint)(b << shift);
+                shift += 7;
+            }
+
+            return output;
+        }
+
+        public MessageReader_Bytes Slice(int start, int length)
+        {
+            return new MessageReader_Bytes(Tag, Buffer, start, length);
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private byte FastByte()
+        {
+            return Buffer[Position++];
+        }
+    }
+}