DocumentTableReader.cs

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using System.Reflection.Internal;
 
namespace System.Reflection.Metadata.Ecma335;
 
internal readonly struct DocumentTableReader
{
    internal readonly int NumberOfRows;
 
    private readonly bool _isGuidHeapRefSizeSmall;
 
    private readonly bool _isBlobHeapRefSizeSmall;
 
    private readonly int _hashAlgorithmOffset;
 
    private readonly int _hashOffset;
 
    private readonly int _languageOffset;
 
    internal readonly int RowSize;
 
    internal readonly MemoryBlock Block;
 
    internal DocumentTableReader(int numberOfRows, int guidHeapRefSize, int blobHeapRefSize, MemoryBlock containingBlock, int containingBlockOffset)
    {
        NumberOfRows = numberOfRows;
        _isGuidHeapRefSizeSmall = guidHeapRefSize == 2;
        _isBlobHeapRefSizeSmall = blobHeapRefSize == 2;
        _hashAlgorithmOffset = blobHeapRefSize;
        _hashOffset = _hashAlgorithmOffset + guidHeapRefSize;
        _languageOffset = _hashOffset + blobHeapRefSize;
        RowSize = _languageOffset + guidHeapRefSize;
        Block = containingBlock.GetMemoryBlockAt(containingBlockOffset, RowSize * numberOfRows);
    }
 
    internal DocumentNameBlobHandle GetName(DocumentHandle handle)
    {
        int offset = (handle.RowId - 1) * RowSize;
        return DocumentNameBlobHandle.FromOffset(Block.PeekHeapReference(offset, _isBlobHeapRefSizeSmall));
    }
 
    internal GuidHandle GetHashAlgorithm(DocumentHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return GuidHandle.FromIndex(Block.PeekHeapReference(num + _hashAlgorithmOffset, _isGuidHeapRefSizeSmall));
    }
 
    internal BlobHandle GetHash(DocumentHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return BlobHandle.FromOffset(Block.PeekHeapReference(num + _hashOffset, _isBlobHeapRefSizeSmall));
    }
 
    internal GuidHandle GetLanguage(DocumentHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return GuidHandle.FromIndex(Block.PeekHeapReference(num + _languageOffset, _isGuidHeapRefSizeSmall));
    }
}