AssemblyRefOSTableReader.cs

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using System.Reflection.Internal;
 
namespace System.Reflection.Metadata.Ecma335;
 
internal readonly struct AssemblyRefOSTableReader
{
    internal readonly int NumberOfRows;
 
    private readonly bool _IsAssemblyRefTableRowRefSizeSmall;
 
    private readonly int _OSPlatformIdOffset;
 
    private readonly int _OSMajorVersionIdOffset;
 
    private readonly int _OSMinorVersionIdOffset;
 
    private readonly int _AssemblyRefOffset;
 
    internal readonly int RowSize;
 
    internal readonly MemoryBlock Block;
 
    internal AssemblyRefOSTableReader(int numberOfRows, int assemblyRefTableRowRefSize, MemoryBlock containingBlock, int containingBlockOffset)
    {
        NumberOfRows = numberOfRows;
        _IsAssemblyRefTableRowRefSizeSmall = assemblyRefTableRowRefSize == 2;
        _OSPlatformIdOffset = 0;
        _OSMajorVersionIdOffset = _OSPlatformIdOffset + 4;
        _OSMinorVersionIdOffset = _OSMajorVersionIdOffset + 4;
        _AssemblyRefOffset = _OSMinorVersionIdOffset + 4;
        RowSize = _AssemblyRefOffset + assemblyRefTableRowRefSize;
        Block = containingBlock.GetMemoryBlockAt(containingBlockOffset, RowSize * numberOfRows);
    }
}