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using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace Ryujinx.Audio.Renderer.Utils
{
/// <summary>
/// Helper for IO operations on <see cref="Span{T}"/> and <see cref="Memory{T}"/>.
/// </summary>
public static class SpanIOHelper
{
/// <summary>
/// Write the given data to the given backing <see cref="Memory{T}"/> and move cursor after the written data.
/// </summary>
/// <typeparam name="T">The data type.</typeparam>
/// <param name="backingMemory">The backing <see cref="Memory{T}"/> to store the data.</param>
/// <param name="data">The data to write to the backing <see cref="Memory{T}"/>.</param>
public static void Write<T>(ref Memory<byte> backingMemory, ref T data) where T : unmanaged
{
int size = Unsafe.SizeOf<T>();
if (size > backingMemory.Length)
{
throw new ArgumentOutOfRangeException();
}
MemoryMarshal.Write<T>(backingMemory.Span.Slice(0, size), ref data);
backingMemory = backingMemory.Slice(size);
}
/// <summary>
/// Write the given data to the given backing <see cref="Span{T}"/> and move cursor after the written data.
/// </summary>
/// <typeparam name="T">The data type.</typeparam>
/// <param name="backingMemory">The backing <see cref="Span{T}"/> to store the data.</param>
/// <param name="data">The data to write to the backing <see cref="Span{T}"/>.</param>
public static void Write<T>(ref Span<byte> backingMemory, ref T data) where T : unmanaged
{
int size = Unsafe.SizeOf<T>();
if (size > backingMemory.Length)
{
throw new ArgumentOutOfRangeException();
}
MemoryMarshal.Write<T>(backingMemory.Slice(0, size), ref data);
backingMemory = backingMemory.Slice(size);
}
/// <summary>
/// Get a <see cref="Span{T}"/> out of a <paramref name="backingMemory"/> and move cursor after T size.
/// </summary>
/// <typeparam name="T">The data type.</typeparam>
/// <param name="backingMemory">The backing <see cref="Memory{T}"/> to get a <see cref="Span{T}"/> from.</param>
/// <returns>A <see cref="Span{T}"/> from backing <see cref="Memory{T}"/>.</returns>
public static Span<T> GetWriteRef<T>(ref Memory<byte> backingMemory) where T : unmanaged
{
int size = Unsafe.SizeOf<T>();
if (size > backingMemory.Length)
{
throw new ArgumentOutOfRangeException();
}
Span<T> result = MemoryMarshal.Cast<byte, T>(backingMemory.Span.Slice(0, size));
backingMemory = backingMemory.Slice(size);
return result;
}
/// <summary>
/// Get a <see cref="Span{T}"/> out of a backingMemory and move cursor after T size.
/// </summary>
/// <typeparam name="T">The data type.</typeparam>
/// <param name="backingMemory">The backing <see cref="Span{T}"/> to get a <see cref="Span{T}"/> from.</param>
/// <returns>A <see cref="Span{T}"/> from backing <see cref="Span{T}"/>.</returns>
public static Span<T> GetWriteRef<T>(ref Span<byte> backingMemory) where T : unmanaged
{
int size = Unsafe.SizeOf<T>();
if (size > backingMemory.Length)
{
throw new ArgumentOutOfRangeException();
}
Span<T> result = MemoryMarshal.Cast<byte, T>(backingMemory.Slice(0, size));
backingMemory = backingMemory.Slice(size);
return result;
}
/// <summary>
/// Read data from the given backing <see cref="ReadOnlyMemory{T}"/> and move cursor after the read data.
/// </summary>
/// <typeparam name="T">The data type.</typeparam>
/// <param name="backingMemory">The backing <see cref="ReadOnlyMemory{T}"/> to read data from.</param>
/// <returns>Return the read data.</returns>
public static T Read<T>(ref ReadOnlyMemory<byte> backingMemory) where T : unmanaged
{
int size = Unsafe.SizeOf<T>();
if (size > backingMemory.Length)
{
throw new ArgumentOutOfRangeException();
}
T result = MemoryMarshal.Read<T>(backingMemory.Span.Slice(0, size));
backingMemory = backingMemory.Slice(size);
return result;
}
/// <summary>
/// Read data from the given backing <see cref="ReadOnlySpan{T}"/> and move cursor after the read data.
/// </summary>
/// <typeparam name="T">The data type.</typeparam>
/// <param name="backingMemory">The backing <see cref="ReadOnlySpan{T}"/> to read data from.</param>
/// <returns>Return the read data.</returns>
public static T Read<T>(ref ReadOnlySpan<byte> backingMemory) where T : unmanaged
{
int size = Unsafe.SizeOf<T>();
if (size > backingMemory.Length)
{
throw new ArgumentOutOfRangeException();
}
T result = MemoryMarshal.Read<T>(backingMemory.Slice(0, size));
backingMemory = backingMemory.Slice(size);
return result;
}
/// <summary>
/// Extract a <see cref="Memory{T}"/> at the given index.
/// </summary>
/// <typeparam name="T">The data type.</typeparam>
/// <param name="memory">The <see cref="Memory{T}"/> to extract the data from.</param>
/// <param name="id">The id in the provided memory.</param>
/// <param name="count">The max allowed count. (for bound checking of the id in debug mode)</param>
/// <returns>a <see cref="Memory{T}"/> at the given id.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static Memory<T> GetMemory<T>(Memory<T> memory, int id, uint count) where T : unmanaged
{
Debug.Assert(id >= 0 && id < count);
return memory.Slice(id, 1);
}
/// <summary>
/// Extract a ref T at the given index.
/// </summary>
/// <typeparam name="T">The data type.</typeparam>
/// <param name="memory">The <see cref="Memory{T}"/> to extract the data from.</param>
/// <param name="id">The id in the provided memory.</param>
/// <param name="count">The max allowed count. (for bound checking of the id in debug mode)</param>
/// <returns>a ref T at the given id.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static ref T GetFromMemory<T>(Memory<T> memory, int id, uint count) where T : unmanaged
{
return ref GetMemory(memory, id, count).Span[0];
}
}
}
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