MethodPtrTableReader.cs

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using System.Reflection.Internal;
 
namespace System.Reflection.Metadata.Ecma335;
 
internal readonly struct MethodPtrTableReader
{
    internal readonly int NumberOfRows;
 
    private readonly bool _IsMethodTableRowRefSizeSmall;
 
    private readonly int _MethodOffset;
 
    internal readonly int RowSize;
 
    internal readonly MemoryBlock Block;
 
    internal MethodPtrTableReader(int numberOfRows, int methodTableRowRefSize, MemoryBlock containingBlock, int containingBlockOffset)
    {
        NumberOfRows = numberOfRows;
        _IsMethodTableRowRefSizeSmall = methodTableRowRefSize == 2;
        _MethodOffset = 0;
        RowSize = _MethodOffset + methodTableRowRefSize;
        Block = containingBlock.GetMemoryBlockAt(containingBlockOffset, RowSize * numberOfRows);
    }
 
    internal MethodDefinitionHandle GetMethodFor(int rowId)
    {
        int num = (rowId - 1) * RowSize;
        return MethodDefinitionHandle.FromRowId(Block.PeekReference(num + _MethodOffset, _IsMethodTableRowRefSizeSmall));
    }
 
    internal int GetRowIdForMethodDefRow(int methodDefRowId)
    {
        return Block.LinearSearchReference(RowSize, _MethodOffset, (uint)methodDefRowId, _IsMethodTableRowRefSizeSmall) + 1;
    }
}