TryPrepareScatterGatherBuffers< T, THandler >()

static unsafe bool System.IO.RandomAccess.TryPrepareScatterGatherBuffers< T, THandler > ( IReadOnlyList< T > buffers, THandler handler, [NotNullWhen(true)] out MemoryHandle[] handlesToDispose, out IntPtr segmentsPtr, out int totalBytes )

inlinestaticprivate

Type Constraints

THandler	:	struct
THandler	:	IMemoryHandler<T>

Definition at line 532 of file RandomAccess.cs.

                                                                                                                                                                                                                                           : struct, IMemoryHandler<T>
    {
        int num = s_cachedPageSize;
        long num2 = num - 1;
        int count = buffers.Count;
        handlesToDispose = null;
        segmentsPtr = IntPtr.Zero;
        totalBytes = 0;
        long* ptr = null;
        bool flag = false;
        try
        {
            long num3 = 0L;
            for (int i = 0; i < count; i++)
            {
                T memory = buffers[i];
                int length = handler.GetLength(in memory);
                num3 += length;
                if (length != num || num3 > int.MaxValue)
                {
                    return false;
                }
                MemoryHandle memoryHandle = handler.Pin(in memory);
                long num4 = (long)memoryHandle.Pointer;
                if ((num4 & num2) != 0L)
                {
                    memoryHandle.Dispose();
                    return false;
                }
                (handlesToDispose ?? (handlesToDispose = new MemoryHandle[count]))[i] = memoryHandle;
                if (ptr == null)
                {
                    ptr = (long*)NativeMemory.Alloc((nuint)count + (nuint)1u, 8u);
                    ptr[count] = 0L;
                }
                ptr[i] = num4;
            }
            segmentsPtr = (IntPtr)ptr;
            totalBytes = (int)num3;
            flag = true;
            return handlesToDispose != null;
        }
        finally
        {
            if (!flag)
            {
                CleanupScatterGatherBuffers(handlesToDispose, (IntPtr)ptr);
            }
        }
    }

References System.Runtime.InteropServices.NativeMemory.Alloc(), System.buffers, System.IO.RandomAccess.CleanupScatterGatherBuffers(), System.count, System.L, System.length, System.IO.RandomAccess.s_cachedPageSize, and System.IntPtr.Zero.