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Diffstat (limited to 'src/mscorlib/src/System/Runtime/InteropServices/NativeBuffer.cs')
| -rw-r--r-- | src/mscorlib/src/System/Runtime/InteropServices/NativeBuffer.cs | 175 |
1 files changed, 0 insertions, 175 deletions
diff --git a/src/mscorlib/src/System/Runtime/InteropServices/NativeBuffer.cs b/src/mscorlib/src/System/Runtime/InteropServices/NativeBuffer.cs deleted file mode 100644 index 94261621c3..0000000000 --- a/src/mscorlib/src/System/Runtime/InteropServices/NativeBuffer.cs +++ /dev/null @@ -1,175 +0,0 @@ -// Licensed to the .NET Foundation under one or more agreements. -// The .NET Foundation licenses this file to you under the MIT license. -// See the LICENSE file in the project root for more information. - -using System.Runtime.CompilerServices; - -namespace System.Runtime.InteropServices -{ - /// <summary> - /// Wrapper for access to the native heap. Dispose to free the memory. Try to use with using statements. - /// Does not allocate zero size buffers, and will free the existing native buffer if capacity is dropped to zero. - /// </summary> - /// <remarks> - /// Suggested use through P/Invoke: define DllImport arguments that take a byte buffer as SafeHandle. - /// - /// Using SafeHandle will ensure that the buffer will not get collected during a P/Invoke. - /// (Notably AddRef and ReleaseRef will be called by the interop layer.) - /// - /// This class is not threadsafe, changing the capacity or disposing on multiple threads risks duplicate heap - /// handles or worse. - /// </remarks> - internal class NativeBuffer : IDisposable - { - [System.Security.SecurityCritical] - private readonly static SafeHandle s_emptyHandle; - [System.Security.SecurityCritical] - private SafeHeapHandle _handle; - private ulong _capacity; - - [System.Security.SecuritySafeCritical] - static NativeBuffer() - { - s_emptyHandle = new EmptySafeHandle(); - } - - /// <summary> - /// Create a buffer with at least the specified initial capacity in bytes. - /// </summary> - public NativeBuffer(ulong initialMinCapacity = 0) - { - EnsureByteCapacity(initialMinCapacity); - } - - protected unsafe void* VoidPointer - { - [MethodImpl(MethodImplOptions.AggressiveInlining)] - [System.Security.SecurityCritical] - get - { - return _handle == null ? null : _handle.DangerousGetHandle().ToPointer(); - } - } - - protected unsafe byte* BytePointer - { - [System.Security.SecurityCritical] - get - { - return (byte*)VoidPointer; - } - } - - /// <summary> - /// Get the handle for the buffer. - /// </summary> - [System.Security.SecuritySafeCritical] - public SafeHandle GetHandle() - { - // Marshalling code will throw on null for SafeHandle - return _handle ?? s_emptyHandle; - } - - /// <summary> - /// The capacity of the buffer in bytes. - /// </summary> - public ulong ByteCapacity - { - get { return _capacity; } - } - - /// <summary> - /// Ensure capacity in bytes is at least the given minimum. - /// </summary> - /// <exception cref="OutOfMemoryException">Thrown if unable to allocate memory when setting.</exception> - /// <exception cref="ArgumentOutOfRangeException">Thrown if attempting to set <paramref name="nameof(minCapacity)"/> to a value that is larger than the maximum addressable memory.</exception> - [System.Security.SecuritySafeCritical] - public void EnsureByteCapacity(ulong minCapacity) - { - if (_capacity < minCapacity) - { - Resize(minCapacity); - _capacity = minCapacity; - } - } - - public unsafe byte this[ulong index] - { - [System.Security.SecuritySafeCritical] - get - { - if (index >= _capacity) throw new ArgumentOutOfRangeException(); - return BytePointer[index]; - } - [System.Security.SecuritySafeCritical] - set - { - if (index >= _capacity) throw new ArgumentOutOfRangeException(); - BytePointer[index] = value; - } - } - - [System.Security.SecuritySafeCritical] - private unsafe void Resize(ulong byteLength) - { - if (byteLength == 0) - { - ReleaseHandle(); - return; - } - - if (_handle == null) - { - _handle = new SafeHeapHandle(byteLength); - } - else - { - _handle.Resize(byteLength); - } - } - - [System.Security.SecuritySafeCritical] - private void ReleaseHandle() - { - if (_handle != null) - { - _capacity = 0; - _handle = null; - } - } - - /// <summary> - /// Release the backing buffer - /// </summary> - [System.Security.SecuritySafeCritical] - public virtual void Free() - { - ReleaseHandle(); - } - - [System.Security.SecuritySafeCritical] - public void Dispose() - { - Free(); - } - - [System.Security.SecurityCritical] - private sealed class EmptySafeHandle : SafeHandle - { - public EmptySafeHandle() : base(IntPtr.Zero, true) { } - - public override bool IsInvalid - { - [System.Security.SecurityCritical] - get - { return true; } - } - - [System.Security.SecurityCritical] - protected override bool ReleaseHandle() - { - return true; - } - } - } -}
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