64 lines
2.1 KiB
C#
64 lines
2.1 KiB
C#
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using System;
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using System.Runtime.InteropServices;
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namespace NetVips;
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/// <summary>
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/// Manage a <see cref="Internal.VipsBlob"/>.
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/// </summary>
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internal class VipsBlob : SafeHandle
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="VipsBlob"/> class
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/// with the specified pointer to wrap around.
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/// </summary>
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/// <param name="pointer">The pointer to wrap around.</param>
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internal VipsBlob(nint pointer) : base(IntPtr.Zero, true)
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{
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// record the pointer we were given to manage
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SetHandle(pointer);
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}
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/// <summary>
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/// Get the data from a <see cref="Internal.VipsBlob"/>.
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/// </summary>
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/// <param name="length">Return number of bytes of data.</param>
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/// <returns>A <see langword="nint"/> containing the data.</returns>
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internal nint GetData(out nuint length)
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{
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return Internal.VipsBlob.Get(this, out length);
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}
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/// <summary>
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/// Decreases the reference count of the blob.
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/// When its reference count drops to 0, the blob is finalized (i.e. its memory is freed).
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/// </summary>
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/// <returns><see langword="true"/> if the handle is released successfully; otherwise,
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/// in the event of a catastrophic failure, <see langword="false"/>.</returns>
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protected override bool ReleaseHandle()
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{
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if (!IsInvalid)
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{
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// Free the VipsArea
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Internal.VipsArea.Unref(handle);
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}
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return true;
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}
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/// <summary>
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/// Gets a value indicating whether the handle is invalid.
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/// </summary>
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/// <returns><see langword="true"/> if the handle is not valid; otherwise, <see langword="false"/>.</returns>
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public override bool IsInvalid => handle == IntPtr.Zero;
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/// <summary>
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/// Get the number of bytes of data.
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/// </summary>
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internal ulong Length => Marshal.PtrToStructure<Internal.VipsArea.Struct>(handle).Length;
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/// <summary>
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/// Get the reference count of the blob. Handy for debugging.
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/// </summary>
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internal int RefCount => Marshal.PtrToStructure<Internal.VipsArea.Struct>(handle).Count;
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}
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