EventTableReader.cs

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using System.Reflection.Internal;
 
namespace System.Reflection.Metadata.Ecma335;
 
internal struct EventTableReader
{
    internal int NumberOfRows;
 
    private readonly bool _IsTypeDefOrRefRefSizeSmall;
 
    private readonly bool _IsStringHeapRefSizeSmall;
 
    private readonly int _FlagsOffset;
 
    private readonly int _NameOffset;
 
    private readonly int _EventTypeOffset;
 
    internal readonly int RowSize;
 
    internal MemoryBlock Block;
 
    internal EventTableReader(int numberOfRows, int typeDefOrRefRefSize, int stringHeapRefSize, MemoryBlock containingBlock, int containingBlockOffset)
    {
        NumberOfRows = numberOfRows;
        _IsTypeDefOrRefRefSizeSmall = typeDefOrRefRefSize == 2;
        _IsStringHeapRefSizeSmall = stringHeapRefSize == 2;
        _FlagsOffset = 0;
        _NameOffset = _FlagsOffset + 2;
        _EventTypeOffset = _NameOffset + stringHeapRefSize;
        RowSize = _EventTypeOffset + typeDefOrRefRefSize;
        Block = containingBlock.GetMemoryBlockAt(containingBlockOffset, RowSize * numberOfRows);
    }
 
    internal EventAttributes GetFlags(EventDefinitionHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return (EventAttributes)Block.PeekUInt16(num + _FlagsOffset);
    }
 
    internal StringHandle GetName(EventDefinitionHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return StringHandle.FromOffset(Block.PeekHeapReference(num + _NameOffset, _IsStringHeapRefSizeSmall));
    }
 
    internal EntityHandle GetEventType(EventDefinitionHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return TypeDefOrRefTag.ConvertToHandle(Block.PeekTaggedReference(num + _EventTypeOffset, _IsTypeDefOrRefRefSizeSmall));
    }
}