TypeRefTableReader.cs

Go to the documentation of this file.

using System.Reflection.Internal;
 
namespace System.Reflection.Metadata.Ecma335;
 
internal readonly struct TypeRefTableReader
{
    internal readonly int NumberOfRows;
 
    private readonly bool _IsResolutionScopeRefSizeSmall;
 
    private readonly bool _IsStringHeapRefSizeSmall;
 
    private readonly int _ResolutionScopeOffset;
 
    private readonly int _NameOffset;
 
    private readonly int _NamespaceOffset;
 
    internal readonly int RowSize;
 
    internal readonly MemoryBlock Block;
 
    internal TypeRefTableReader(int numberOfRows, int resolutionScopeRefSize, int stringHeapRefSize, MemoryBlock containingBlock, int containingBlockOffset)
    {
        NumberOfRows = numberOfRows;
        _IsResolutionScopeRefSizeSmall = resolutionScopeRefSize == 2;
        _IsStringHeapRefSizeSmall = stringHeapRefSize == 2;
        _ResolutionScopeOffset = 0;
        _NameOffset = _ResolutionScopeOffset + resolutionScopeRefSize;
        _NamespaceOffset = _NameOffset + stringHeapRefSize;
        RowSize = _NamespaceOffset + stringHeapRefSize;
        Block = containingBlock.GetMemoryBlockAt(containingBlockOffset, RowSize * numberOfRows);
    }
 
    internal EntityHandle GetResolutionScope(TypeReferenceHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return ResolutionScopeTag.ConvertToHandle(Block.PeekTaggedReference(num + _ResolutionScopeOffset, _IsResolutionScopeRefSizeSmall));
    }
 
    internal StringHandle GetName(TypeReferenceHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return StringHandle.FromOffset(Block.PeekHeapReference(num + _NameOffset, _IsStringHeapRefSizeSmall));
    }
 
    internal StringHandle GetNamespace(TypeReferenceHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return StringHandle.FromOffset(Block.PeekHeapReference(num + _NamespaceOffset, _IsStringHeapRefSizeSmall));
    }
}