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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++];
}
}
}
|
