EventMapTableReader.cs

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using System.Reflection.Internal;
 
namespace System.Reflection.Metadata.Ecma335;
 
internal readonly struct EventMapTableReader
{
    internal readonly int NumberOfRows;
 
    private readonly bool _IsTypeDefTableRowRefSizeSmall;
 
    private readonly bool _IsEventRefSizeSmall;
 
    private readonly int _ParentOffset;
 
    private readonly int _EventListOffset;
 
    internal readonly int RowSize;
 
    internal readonly MemoryBlock Block;
 
    internal EventMapTableReader(int numberOfRows, int typeDefTableRowRefSize, int eventRefSize, MemoryBlock containingBlock, int containingBlockOffset)
    {
        NumberOfRows = numberOfRows;
        _IsTypeDefTableRowRefSizeSmall = typeDefTableRowRefSize == 2;
        _IsEventRefSizeSmall = eventRefSize == 2;
        _ParentOffset = 0;
        _EventListOffset = _ParentOffset + typeDefTableRowRefSize;
        RowSize = _EventListOffset + eventRefSize;
        Block = containingBlock.GetMemoryBlockAt(containingBlockOffset, RowSize * numberOfRows);
    }
 
    internal int FindEventMapRowIdFor(TypeDefinitionHandle typeDef)
    {
        int num = Block.LinearSearchReference(RowSize, _ParentOffset, (uint)typeDef.RowId, _IsTypeDefTableRowRefSizeSmall);
        return num + 1;
    }
 
    internal TypeDefinitionHandle GetParentType(int rowId)
    {
        int num = (rowId - 1) * RowSize;
        return TypeDefinitionHandle.FromRowId(Block.PeekReference(num + _ParentOffset, _IsTypeDefTableRowRefSizeSmall));
    }
 
    internal int GetEventListStartFor(int rowId)
    {
        int num = (rowId - 1) * RowSize;
        return Block.PeekReference(num + _EventListOffset, _IsEventRefSizeSmall);
    }
}