<#@ template debug="false" hostspecific="false" language="C#" #>
<#@ assembly name="System.Core" #>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.Text" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ output extension=".cs" #>
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Text;
namespace Misaki.HighPerformance.LowLevel.Buffer;
<# for (int i = 32; i <= 4096; i *= 2) { #>
///
/// Represents a heap allocated fixed-size UTF-8 encoded string of length <#= i #> bytes.
///
[StructLayout(LayoutKind.Sequential, Size = <#= i #>)]
public unsafe struct FixedString<#= i #> : IDisposable
{
private ushort _length;
private byte* _buffer;
public ushort Length => _length;
public string Value
{
readonly get
{
return Encoding.UTF8.GetString(_buffer, _length);
}
set
{
if (string.IsNullOrEmpty(value))
{
_length = 0;
return;
}
var maxBytes = Encoding.UTF8.GetByteCount(value);
if (maxBytes > <#= i - 2 #>)
{
throw new ArgumentException("Input string is too long to fit in FixedString<#= i #>.");
}
_length = (ushort)Encoding.UTF8.GetBytes(value, new Span(_buffer, <#= i - 2 #>));
}
}
public FixedString<#= i #>(ReadOnlySpan input)
{
var maxBytes = Encoding.UTF8.GetByteCount(input);
if (maxBytes > <#= i - 2 #>)
{
throw new ArgumentException("Input string is too long to fit in FixedString<#= i #>.");
}
_buffer = (byte*)NativeMemory.Alloc(<#= i - 2 #>);
fixed (char* inputPtr = input)
{
var actualByteCount = Encoding.UTF8.GetBytes(inputPtr, input.Length, _buffer, <#= i - 2 #>);
_length = (ushort)actualByteCount;
}
}
public FixedString<#= i #>(string input)
: this(input.AsSpan())
{
}
public FixedString<#= i #>(char* input, ushort length)
: this(new Span(input, length))
{
}
public FixedString<#= i #>(ReadOnlySpan input)
{
if (input.Length > <#= i - 2 #>)
{
throw new ArgumentException("Input byte array is too long to fit in FixedString<#= i #>.");
}
_buffer = (byte*)NativeMemory.Alloc(<#= i - 2 #>);
_length = (ushort)input.Length;
fixed (byte* inputPtr = input)
{
Unsafe.CopyBlockUnaligned(_buffer, inputPtr, _length);
}
}
public FixedString<#= i #>(byte* input, ushort length)
: this(new ReadOnlySpan(input, length))
{
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public readonly Span AsSpan()
{
return new(_buffer, _length);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public readonly byte* GetUnsafePointer()
{
return _buffer;
}
public override string ToString()
{
return Value;
}
public void Dispose()
{
if (_buffer != null)
{
NativeMemory.Free(_buffer);
_length = 0;
_buffer = null;
}
}
}
<# } #>