DirectBufferMemoryManager.cs

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using System;
using System.Buffers;
 
using IKVM.Runtime;
using IKVM.Runtime.Accessors.Java.Lang;
 
namespace IKVM.Runtime.Util.Java.Nio
{
 
#if FIRST_PASS == false
 
    class DirectBufferMemoryManager : MemoryManager<byte>
    {
 
        static BufferAccessor bufferAccessor;
        static BufferAccessor BufferAccessor => JVM.Internal.BaseAccessors.Get(ref bufferAccessor);
 
        readonly object buffer;
 
        public DirectBufferMemoryManager(object buffer)
        {
            this.buffer = buffer ?? throw new ArgumentNullException(nameof(buffer));
        }
 
        public override unsafe Span<byte> GetSpan() => new Span<byte>((byte*)(IntPtr)BufferAccessor.GetAddress(buffer), BufferAccessor.GetCapacity(buffer));
 
        public override unsafe MemoryHandle Pin(int elementIndex = 0)
        {
            if (elementIndex < 0 || elementIndex >= bufferAccessor.GetCapacity(buffer))
                throw new ArgumentOutOfRangeException(nameof(elementIndex));
 
            return new MemoryHandle((byte*)(IntPtr)(bufferAccessor.GetAddress(buffer)) + elementIndex);
        }
 
        public override void Unpin()
        {
 
        }
 
        protected override void Dispose(bool disposing)
        {
            // Java deals with this through the use of a Cleaner
            // TODO I think we should own this
        }
 
    }
 
#endif
 
}