128 lines
3.6 KiB
Plaintext
128 lines
3.6 KiB
Plaintext
<#@ template debug="false" hostspecific="false" language="C#" #>
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<#@ assembly name="System.Core" #>
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<#@ import namespace="System.Linq" #>
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<#@ import namespace="System.Text" #>
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<#@ import namespace="System.Collections.Generic" #>
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<#@ output extension=".gen.cs" #>
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace Misaki.HighPerformance.LowLevel.Collections;
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<# for (int i = 32; i <= 4096; i *= 2) { #>
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/// <summary>
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/// Represents a stack allocated fixed-size UTF-8 encoded string of length <#= i #> bytes.
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/// </summary>
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/// <remarks>
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/// This struct is designed to hold data on the stack. Every copy of this struct causes a copy of the underlying data.
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/// If you need a heap allocated fixed-size UTF-8 encoded string of length <#= i #> bytes, consider using <see cref="Misaki.HighPerformance.Unsafe.Buffer.FixedText<#= i #>"/>.
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/// </remarks>
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[StructLayout(LayoutKind.Sequential, Size = <#= i #>)]
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public unsafe struct FixedText<#= i #>
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{
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public const int MAX_LENGTH = <#= i - 2 #>;
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private ushort _length;
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private fixed byte _buffer[MAX_LENGTH];
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public readonly ushort Length => _length;
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public string Value
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{
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get
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{
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fixed (byte* bufferPtr = _buffer)
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{
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return Encoding.UTF8.GetString(bufferPtr, _length);
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}
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}
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set
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{
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if (string.IsNullOrEmpty(value))
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{
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_length = 0;
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return;
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}
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var maxBytes = Encoding.UTF8.GetByteCount(value);
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if (maxBytes > MAX_LENGTH)
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{
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throw new ArgumentException("Input string is too long to fit in FixedText<#= i #>.");
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}
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fixed (byte* bufferPtr = _buffer)
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{
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_length = (ushort)Encoding.UTF8.GetBytes(value, new Span<byte>(bufferPtr, MAX_LENGTH));
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}
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}
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}
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public FixedText<#= i #>(ReadOnlySpan<char> input)
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{
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var maxBytes = Encoding.UTF8.GetByteCount(input);
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if (maxBytes > MAX_LENGTH)
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{
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throw new ArgumentException("Input string is too long to fit in FixedText<#= i #>.");
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}
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fixed (char* inputPtr = input)
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fixed (byte* bufferPtr = _buffer)
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{
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var actualByteCount = Encoding.UTF8.GetBytes(inputPtr, input.Length, bufferPtr, MAX_LENGTH);
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_length = (ushort)actualByteCount;
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}
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}
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public FixedText<#= i #>(string input)
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: this(input.AsSpan())
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{
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}
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public FixedText<#= i #>(char* input, ushort length)
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: this(new Span<char>(input, length))
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{
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}
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public FixedText<#= i #>(ReadOnlySpan<byte> input)
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{
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if (input.Length > MAX_LENGTH)
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{
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throw new ArgumentException("Input byte array is too long to fit in FixedText<#= i #>.");
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}
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_length = (ushort)input.Length;
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fixed (byte* inputPtr = input)
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fixed (byte* bufferPtr = _buffer)
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{
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Unsafe.CopyBlockUnaligned(bufferPtr, inputPtr, _length);
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}
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}
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public FixedText<#= i #>(byte* input, ushort length)
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: this(new ReadOnlySpan<byte>(input, length))
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{
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public Span<byte> AsSpan()
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{
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fixed (byte* ptr = _buffer)
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{
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return new(ptr, _length);
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}
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public readonly byte* GetUnsafePtr()
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{
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return (byte*)((ushort*)Unsafe.AsPointer(in this) + 1);
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}
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public override string ToString()
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{
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return Value;
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}
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}
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<# } #> |