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Copy pathByteReader.cs
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182 lines (156 loc) · 4.34 KB
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using System.Buffers.Binary;
using System.Runtime.CompilerServices;
namespace NetCode;
public sealed class ByteReader : IByteReader
{
private byte[] _data;
private int _start;
private int _end;
private int _head;
public ByteReader() : this(Array.Empty<byte>())
{
}
public ByteReader(byte[] data)
{
_data = data;
_end = _data.Length;
_head = _start = 0;
}
public int Start => _start;
public int End => _end;
public int RemainingToRead => _end - _head;
public int Head => _head;
public void SetArray(byte[] data) => SetArray(data, 0, data.Length);
public void SetArray(byte[] data, int start, int length)
{
if (start + length > data.Length)
{
ThrowHelper.ThrowArgumentOutOfRangeException();
}
_data = data;
_end = length + start;
_head = _start = start;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public void Reset()
{
_head = _start;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public byte ReadByte()
{
var size = 1;
if (_head + size > _end)
{
ThrowHelper.ThrowIndexOutOfRangeException();
}
var value = _data[_head];
_head += size;
return value;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public short ReadShort()
{
var result = Read<short>();
if (!BitConverter.IsLittleEndian)
{
result = BinaryPrimitives.ReverseEndianness(result);
}
return result;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public ushort ReadUShort()
{
var result = Read<ushort>();
if (!BitConverter.IsLittleEndian)
{
result = BinaryPrimitives.ReverseEndianness(result);
}
return result;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public int ReadInt()
{
var result = Read<int>();
if (!BitConverter.IsLittleEndian)
{
result = BinaryPrimitives.ReverseEndianness(result);
}
return result;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public uint ReadUInt()
{
var result = Read<uint>();
if (!BitConverter.IsLittleEndian)
{
result = BinaryPrimitives.ReverseEndianness(result);
}
return result;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public (uint Value, int ReadBytes) TryReadUInt()
{
var (value, readBits) = TryRead<uint>();
if (!BitConverter.IsLittleEndian)
{
value = BinaryPrimitives.ReverseEndianness(value);
}
return (value, readBits);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public long ReadLong()
{
var result = Read<long>();
if (!BitConverter.IsLittleEndian)
{
result = BinaryPrimitives.ReverseEndianness(result);
}
return result;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public ulong ReadULong()
{
var result = Read<ulong>();
if (!BitConverter.IsLittleEndian)
{
result = BinaryPrimitives.ReverseEndianness(result);
}
return result;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private T Read<T>()
where T : unmanaged
{
var size = Unsafe.SizeOf<T>();
if (_head + size > _end)
{
ThrowHelper.ThrowIndexOutOfRangeException();
}
var value = Unsafe.ReadUnaligned<T>(ref _data[_head]);
_head += size;
return value;
}
/// <summary>
/// Can return 8, 16, 24 or 32 read bits for int parameter.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private (T Value, int ReadBytes) TryRead<T>()
where T : unmanaged
{
var size = Unsafe.SizeOf<T>();
if (RemainingToRead < size)
{
size = RemainingToRead;
if (size == 0)
{
return (default, 0);
}
}
var value = Unsafe.ReadUnaligned<T>(ref _data[_head]);
_head += size;
return (value, size);
}
}