StandaloneSignature.cs

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using System.Collections.Immutable;
using System.Reflection.Metadata.Ecma335;
 
namespace System.Reflection.Metadata;
 
public readonly struct StandaloneSignature
{
    private readonly MetadataReader _reader;
 
    private readonly int _rowId;
 
    private StandaloneSignatureHandle Handle => StandaloneSignatureHandle.FromRowId(_rowId);
 
    public BlobHandle Signature => _reader.StandAloneSigTable.GetSignature(_rowId);
 
    internal StandaloneSignature(MetadataReader reader, StandaloneSignatureHandle handle)
    {
        _reader = reader;
        _rowId = handle.RowId;
    }
 
    public MethodSignature<TType> DecodeMethodSignature<TType, TGenericContext>(ISignatureTypeProvider<TType, TGenericContext> provider, TGenericContext genericContext)
    {
        SignatureDecoder<TType, TGenericContext> signatureDecoder = new SignatureDecoder<TType, TGenericContext>(provider, _reader, genericContext);
        BlobReader blobReader = _reader.GetBlobReader(Signature);
        return signatureDecoder.DecodeMethodSignature(ref blobReader);
    }
 
    public ImmutableArray<TType> DecodeLocalSignature<TType, TGenericContext>(ISignatureTypeProvider<TType, TGenericContext> provider, TGenericContext genericContext)
    {
        SignatureDecoder<TType, TGenericContext> signatureDecoder = new SignatureDecoder<TType, TGenericContext>(provider, _reader, genericContext);
        BlobReader blobReader = _reader.GetBlobReader(Signature);
        return signatureDecoder.DecodeLocalSignature(ref blobReader);
    }
 
    public CustomAttributeHandleCollection GetCustomAttributes()
    {
        return new CustomAttributeHandleCollection(_reader, Handle);
    }
 
    public StandaloneSignatureKind GetKind()
    {
        return _reader.GetBlobReader(Signature).ReadSignatureHeader().Kind switch
        {
            SignatureKind.Method => StandaloneSignatureKind.Method, 
            SignatureKind.LocalVariables => StandaloneSignatureKind.LocalVariables, 
            _ => throw new BadImageFormatException(), 
        };
    }
}