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Added protected size and offset values

pull/161/head
dahall 2020-08-19 20:51:11 -06:00
parent 78ce3ad034
commit c5814672d5
1 changed files with 9 additions and 3 deletions
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12
Core/InteropServices/SafeMemStruct.cs
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@ -17,14 +17,17 @@ namespace Vanara.InteropServices
/// <seealso cref="Vanara.InteropServices.SafeMemoryHandle{TMem}"/>
public abstract class SafeMemStruct<TStruct, TMem> : SafeMemoryHandle<TMem>, IEquatable<TStruct> where TMem : IMemoryMethods, new() where TStruct : struct
{
/// <summary>The structure size, in bytes, of TStruct.</summary>
protected static readonly SizeT BaseStructSize = InteropExtensions.SizeOf<TStruct>();
/// <summary>Initializes a new instance of the <see cref="SafeMemStruct{TStruct, TMem}"/> class.</summary>
/// <param name="s">The TStruct value.</param>
/// <param name="capacity">The capacity of the buffer, in bytes.</param>
protected SafeMemStruct(in TStruct s, SizeT capacity = default) : base(Math.Max((ulong)SizeOf<TStruct>(), (ulong)capacity)) => handle.Write(s);
protected SafeMemStruct(in TStruct s, SizeT capacity = default) : base(Math.Max(BaseStructSize, (ulong)capacity)) => handle.Write(s);
/// <summary>Initializes a new instance of the <see cref="SafeMemStruct{TStruct, TMem}"/> class.</summary>
/// <param name="capacity">The capacity of the buffer, in bytes.</param>
protected SafeMemStruct(SizeT capacity = default) : base(Math.Max((ulong)SizeOf<TStruct>(), (ulong)capacity)) { }
protected SafeMemStruct(SizeT capacity = default) : base(Math.Max(BaseStructSize, (ulong)capacity)) { }
/// <summary>Initializes a new instance of the <see cref="SafeMemStruct{TStruct, TMem}"/> class.</summary>
/// <param name="ptr">The PTR.</param>
@ -116,7 +119,10 @@ namespace Vanara.InteropServices
/// <returns>A <see cref="System.String"/> value held by this instance or <c>null</c> if the handle is invalid.</returns>
public override string ToString() => ((TStruct?)this).ToString();
private static SizeT SizeOf<T>() => InteropExtensions.SizeOf<T>();
/// <summary>Returns the field offset of the named field.</summary>
/// <param name="name">The field name.</param>
/// <returns>The offset, in bytes, of the field within the structure.</returns>
protected static long FieldOffset(string name) => Marshal.OffsetOf(typeof(TStruct), name).ToInt64();
#if ALLOWSPAN
/// <summary>Gets a reference to a structure based on this allocated memory.</summary>