ManifestResourceTableReader.cs

Go to the documentation of this file.

using System.Reflection.Internal;
 
namespace System.Reflection.Metadata.Ecma335;
 
internal readonly struct ManifestResourceTableReader
{
    internal readonly int NumberOfRows;
 
    private readonly bool _IsImplementationRefSizeSmall;
 
    private readonly bool _IsStringHeapRefSizeSmall;
 
    private readonly int _OffsetOffset;
 
    private readonly int _FlagsOffset;
 
    private readonly int _NameOffset;
 
    private readonly int _ImplementationOffset;
 
    internal readonly int RowSize;
 
    internal readonly MemoryBlock Block;
 
    internal ManifestResourceTableReader(int numberOfRows, int implementationRefSize, int stringHeapRefSize, MemoryBlock containingBlock, int containingBlockOffset)
    {
        NumberOfRows = numberOfRows;
        _IsImplementationRefSizeSmall = implementationRefSize == 2;
        _IsStringHeapRefSizeSmall = stringHeapRefSize == 2;
        _OffsetOffset = 0;
        _FlagsOffset = _OffsetOffset + 4;
        _NameOffset = _FlagsOffset + 4;
        _ImplementationOffset = _NameOffset + stringHeapRefSize;
        RowSize = _ImplementationOffset + implementationRefSize;
        Block = containingBlock.GetMemoryBlockAt(containingBlockOffset, RowSize * numberOfRows);
    }
 
    internal StringHandle GetName(ManifestResourceHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return StringHandle.FromOffset(Block.PeekHeapReference(num + _NameOffset, _IsStringHeapRefSizeSmall));
    }
 
    internal EntityHandle GetImplementation(ManifestResourceHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return ImplementationTag.ConvertToHandle(Block.PeekTaggedReference(num + _ImplementationOffset, _IsImplementationRefSizeSmall));
    }
 
    internal uint GetOffset(ManifestResourceHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return Block.PeekUInt32(num + _OffsetOffset);
    }
 
    internal ManifestResourceAttributes GetFlags(ManifestResourceHandle handle)
    {
        int num = (handle.RowId - 1) * RowSize;
        return (ManifestResourceAttributes)Block.PeekUInt32(num + _FlagsOffset);
    }
}