ImportScopeTableReader.cs

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using System.Reflection.Internal;
 
namespace System.Reflection.Metadata.Ecma335;
 
internal readonly struct ImportScopeTableReader
{
    internal readonly int NumberOfRows;
 
    private readonly bool _isImportScopeRefSizeSmall;
 
    private readonly bool _isBlobHeapRefSizeSmall;
 
    private readonly int _importsOffset;
 
    internal readonly int RowSize;
 
    internal readonly MemoryBlock Block;
 
    internal ImportScopeTableReader(int numberOfRows, int importScopeRefSize, int blobHeapRefSize, MemoryBlock containingBlock, int containingBlockOffset)
    {
        NumberOfRows = numberOfRows;
        _isImportScopeRefSizeSmall = importScopeRefSize == 2;
        _isBlobHeapRefSizeSmall = blobHeapRefSize == 2;
        _importsOffset = importScopeRefSize;
        RowSize = _importsOffset + blobHeapRefSize;
        Block = containingBlock.GetMemoryBlockAt(containingBlockOffset, RowSize * numberOfRows);
    }
 
    internal ImportScopeHandle GetParent(ImportScopeHandle handle)
    {
        int offset = (handle.RowId - 1) * RowSize;
        return ImportScopeHandle.FromRowId(Block.PeekReference(offset, _isImportScopeRefSizeSmall));
    }
 
    internal BlobHandle GetImports(ImportScopeHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return BlobHandle.FromOffset(Block.PeekHeapReference(num + _importsOffset, _isBlobHeapRefSizeSmall));
    }
}