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Add
BStrStringMarshaller to source generator (#69213)
* Add BStrStringMarshaller to source generator * Convert to use void* for BStr and Utf16 marshallers' native types. Co-authored-by: Jan Kotas <jkotas@microsoft.com>
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...em.Private.CoreLib/src/System/Runtime/InteropServices/Marshalling/BStrStringMarshaller.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
|
|
||
| using System.Diagnostics; | ||
| using System.Runtime.CompilerServices; | ||
| using System.Text; | ||
|
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| namespace System.Runtime.InteropServices.Marshalling | ||
| { | ||
| /// <summary> | ||
| /// Marshaller for BSTR strings | ||
| /// </summary> | ||
| [CLSCompliant(false)] | ||
| [CustomTypeMarshaller(typeof(string), BufferSize = 0x100, | ||
| Features = CustomTypeMarshallerFeatures.UnmanagedResources | CustomTypeMarshallerFeatures.TwoStageMarshalling | CustomTypeMarshallerFeatures.CallerAllocatedBuffer)] | ||
| public unsafe ref struct BStrStringMarshaller | ||
| { | ||
| private void* _ptrToFirstChar; | ||
| private bool _allocated; | ||
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| /// <summary> | ||
| /// Initializes a new instance of the <see cref="BStrStringMarshaller"/>. | ||
| /// </summary> | ||
| /// <param name="str">The string to marshal.</param> | ||
| public BStrStringMarshaller(string? str) | ||
| : this(str, default) | ||
| { } | ||
|
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| /// <summary> | ||
| /// Initializes a new instance of the <see cref="BStrStringMarshaller"/>. | ||
| /// </summary> | ||
| /// <param name="str">The string to marshal.</param> | ||
| /// <param name="buffer">Buffer that may be used for marshalling.</param> | ||
| /// <remarks> | ||
| /// The <paramref name="buffer"/> must not be movable - that is, it should not be | ||
| /// on the managed heap or it should be pinned. | ||
| /// <seealso cref="CustomTypeMarshallerFeatures.CallerAllocatedBuffer"/> | ||
| /// </remarks> | ||
| public BStrStringMarshaller(string? str, Span<ushort> buffer) | ||
| { | ||
| _allocated = false; | ||
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|
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| if (str is null) | ||
| { | ||
| _ptrToFirstChar = null; | ||
| return; | ||
| } | ||
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| ushort* ptrToFirstChar; | ||
| int lengthInBytes = checked(sizeof(char) * str.Length); | ||
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| // A caller provided buffer must be at least (lengthInBytes + 6) bytes | ||
| // in order to be constructed manually. The 6 extra bytes are 4 for byte length and 2 for wide null. | ||
| int manualBstrNeeds = checked(lengthInBytes + 6); | ||
| if (manualBstrNeeds > buffer.Length) | ||
| { | ||
| // Use precise byte count when the provided stack-allocated buffer is not sufficient | ||
| ptrToFirstChar = (ushort*)Marshal.AllocBSTRByteLen((uint)lengthInBytes); | ||
| _allocated = true; | ||
| } | ||
| else | ||
| { | ||
| // Set length and update buffer target | ||
| byte* pBuffer = (byte*)Unsafe.AsPointer(ref MemoryMarshal.GetReference(buffer)); | ||
| *((uint*)pBuffer) = (uint)lengthInBytes; | ||
| ptrToFirstChar = (ushort*)(pBuffer + sizeof(uint)); | ||
| } | ||
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| // Confirm the size is properly set for the allocated BSTR. | ||
| Debug.Assert(lengthInBytes == Marshal.SysStringByteLen((IntPtr)ptrToFirstChar)); | ||
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| // Copy characters from the managed string | ||
| str.CopyTo(new Span<char>(ptrToFirstChar, str.Length)); | ||
| ptrToFirstChar[str.Length] = '\0'; // null-terminate | ||
| _ptrToFirstChar = ptrToFirstChar; | ||
| } | ||
|
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| /// <summary> | ||
| /// Returns the native value representing the string. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// <seealso cref="CustomTypeMarshallerFeatures.TwoStageMarshalling"/> | ||
| /// </remarks> | ||
| public void* ToNativeValue() => _ptrToFirstChar; | ||
|
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| /// <summary> | ||
| /// Sets the native value representing the string. | ||
| /// </summary> | ||
| /// <param name="value">The native value.</param> | ||
| /// <remarks> | ||
| /// <seealso cref="CustomTypeMarshallerFeatures.TwoStageMarshalling"/> | ||
| /// </remarks> | ||
| public void FromNativeValue(void* value) | ||
| { | ||
| _ptrToFirstChar = value; | ||
| _allocated = true; | ||
| } | ||
|
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| /// <summary> | ||
| /// Returns the managed string. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// <seealso cref="CustomTypeMarshallerDirection.Out"/> | ||
| /// </remarks> | ||
| public string? ToManaged() | ||
| { | ||
| if (_ptrToFirstChar is null) | ||
| return null; | ||
|
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| return Marshal.PtrToStringBSTR((IntPtr)_ptrToFirstChar); | ||
| } | ||
|
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| /// <summary> | ||
| /// Frees native resources. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// <seealso cref="CustomTypeMarshallerFeatures.UnmanagedResources"/> | ||
| /// </remarks> | ||
| public void FreeNative() | ||
| { | ||
| if (_allocated) | ||
| Marshal.FreeBSTR((IntPtr)_ptrToFirstChar); | ||
| } | ||
| } | ||
| } |
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