FieldMarshalTableReader.cs

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using System.Reflection.Internal;
 
namespace System.Reflection.Metadata.Ecma335;
 
internal readonly struct FieldMarshalTableReader
{
    internal readonly int NumberOfRows;
 
    private readonly bool _IsHasFieldMarshalRefSizeSmall;
 
    private readonly bool _IsBlobHeapRefSizeSmall;
 
    private readonly int _ParentOffset;
 
    private readonly int _NativeTypeOffset;
 
    internal readonly int RowSize;
 
    internal readonly MemoryBlock Block;
 
    internal FieldMarshalTableReader(int numberOfRows, bool declaredSorted, int hasFieldMarshalRefSize, int blobHeapRefSize, MemoryBlock containingBlock, int containingBlockOffset)
    {
        NumberOfRows = numberOfRows;
        _IsHasFieldMarshalRefSizeSmall = hasFieldMarshalRefSize == 2;
        _IsBlobHeapRefSizeSmall = blobHeapRefSize == 2;
        _ParentOffset = 0;
        _NativeTypeOffset = _ParentOffset + hasFieldMarshalRefSize;
        RowSize = _NativeTypeOffset + blobHeapRefSize;
        Block = containingBlock.GetMemoryBlockAt(containingBlockOffset, RowSize * numberOfRows);
        if (!declaredSorted && !CheckSorted())
        {
            Throw.TableNotSorted(TableIndex.FieldMarshal);
        }
    }
 
    internal EntityHandle GetParent(int rowId)
    {
        int num = (rowId - 1) * RowSize;
        return HasFieldMarshalTag.ConvertToHandle(Block.PeekTaggedReference(num + _ParentOffset, _IsHasFieldMarshalRefSizeSmall));
    }
 
    internal BlobHandle GetNativeType(int rowId)
    {
        int num = (rowId - 1) * RowSize;
        return BlobHandle.FromOffset(Block.PeekHeapReference(num + _NativeTypeOffset, _IsBlobHeapRefSizeSmall));
    }
 
    internal int FindFieldMarshalRowId(EntityHandle handle)
    {
        int num = Block.BinarySearchReference(NumberOfRows, RowSize, _ParentOffset, HasFieldMarshalTag.ConvertToTag(handle), _IsHasFieldMarshalRefSizeSmall);
        return num + 1;
    }
 
    private bool CheckSorted()
    {
        return Block.IsOrderedByReferenceAscending(RowSize, _ParentOffset, _IsHasFieldMarshalRefSizeSmall);
    }
}