sean-m
/
Vanara
mirror of https://github.com/dahall/Vanara.git
1
0
Fork 0
Code Issues Releases Wiki Activity

Added Append overloaded methods to SafeMemStruct to extend memory and write in bytes, memory or objects and return a pointer to the newly written element. Also added GetFieldAddress method to get the location of a field in the structure's memory.

pull/211/head
dahall 2021-01-20 16:56:09 -07:00
parent 2165632d1d
commit affe76ff74
1 changed files with 39 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
Core/InteropServices/SafeMemStruct.cs
View File

@ -84,6 +84,40 @@ namespace Vanara.InteropServices
/// </returns>
public static implicit operator TStruct(SafeMemStruct<TStruct, TMem> s) => !(s is null) ? s.Value : throw new ArgumentNullException(nameof(s));
/// <summary>Appends the specified bytes to the end of the allocated memory for this structure, expanding the allocation to fit the byte array.</summary>
/// <param name="bytes">The bytes.</param>
/// <returns>A pointer to the copied bytes in memory.</returns>
public virtual IntPtr Append(byte[] bytes)
{
var sz = Size;
Size += bytes.Length;
Marshal.Copy(bytes, 0, handle.Offset(sz), bytes.Length);
return handle.Offset(sz);
}
/// <summary>Appends the specified memory to the end of the allocated memory for this structure, expanding the allocation to fit the added memory.</summary>
/// <param name="mem">The memory to append.</param>
/// <returns>A pointer to the copied memory.</returns>
public virtual IntPtr Append(SafeAllocatedMemoryHandleBase mem)
{
var sz = Size;
Size += mem.Size;
((IntPtr)mem).CopyTo(handle.Offset(sz), mem.Size);
return handle.Offset(sz);
}
/// <summary>Appends the specified object to the end of the allocated memory for this structure, expanding the allocation to fit the added object.</summary>
/// <param name="value">The value to append.</param>
/// <returns>A pointer to the copied memory.</returns>
public virtual IntPtr Append(object value)
{
var sz = Size;
var vSz = InteropExtensions.SizeOf(value);
Size += vSz;
handle.Write(value, sz, Size);
return handle.Offset(sz);
}
/// <summary>Determines whether the specified <see cref="System.Object"/>, is equal to this instance.</summary>
/// <param name="obj">The <see cref="System.Object"/> to compare with this instance.</param>
/// <returns><c>true</c> if the specified <see cref="System.Object"/> is equal to this instance; otherwise, <c>false</c>.</returns>
@ -102,6 +136,11 @@ namespace Vanara.InteropServices
/// <returns>true if the current object is equal to the <paramref name="other"/> parameter; otherwise, false.</returns>
public bool Equals(TStruct other) => HasValue && EqualityComparer<TStruct>.Default.Equals(handle.ToStructure<TStruct>(Size), other);
/// <summary>Gets the memory address of a field within <typeparamref name="TStruct"/>.</summary>
/// <param name="fieldName">Name of the field.</param>
/// <returns>The pointer to the field in memory.</returns>
public virtual IntPtr GetFieldAddress(string fieldName) => handle.Offset(FieldOffset(fieldName));
/// <summary>Returns a hash code for this instance.</summary>
/// <returns>A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table.</returns>
public override int GetHashCode() => handle.ToInt32();