Mono.Cecil.Mixin.GetSize C# (CSharp) Method

        public static int GetSize(this CodedIndex self, Func<Table, int> counter)
        {
            int bits;
            Table [] tables;

            switch (self) {
            case CodedIndex.TypeDefOrRef:
                bits = 2;
                tables = new [] { Table.TypeDef, Table.TypeRef, Table.TypeSpec };
                break;
            case CodedIndex.HasConstant:
                bits = 2;
                tables = new [] { Table.Field, Table.Param, Table.Property };
                break;
            case CodedIndex.HasCustomAttribute:
                bits = 5;
                tables = new [] {
                    Table.Method, Table.Field, Table.TypeRef, Table.TypeDef, Table.Param, Table.InterfaceImpl, Table.MemberRef,
                    Table.Module, Table.DeclSecurity, Table.Property, Table.Event, Table.StandAloneSig, Table.ModuleRef,
                    Table.TypeSpec, Table.Assembly, Table.AssemblyRef, Table.File, Table.ExportedType,
                    Table.ManifestResource, Table.GenericParam, Table.GenericParamConstraint, Table.MethodSpec,
                };
                break;
            case CodedIndex.HasFieldMarshal:
                bits = 1;
                tables = new [] { Table.Field, Table.Param };
                break;
            case CodedIndex.HasDeclSecurity:
                bits = 2;
                tables = new [] { Table.TypeDef, Table.Method, Table.Assembly };
                break;
            case CodedIndex.MemberRefParent:
                bits = 3;
                tables = new [] { Table.TypeDef, Table.TypeRef, Table.ModuleRef, Table.Method, Table.TypeSpec };
                break;
            case CodedIndex.HasSemantics:
                bits = 1;
                tables = new [] { Table.Event, Table.Property };
                break;
            case CodedIndex.MethodDefOrRef:
                bits = 1;
                tables = new [] { Table.Method, Table.MemberRef };
                break;
            case CodedIndex.MemberForwarded:
                bits = 1;
                tables = new [] { Table.Field, Table.Method };
                break;
            case CodedIndex.Implementation:
                bits = 2;
                tables = new [] { Table.File, Table.AssemblyRef, Table.ExportedType };
                break;
            case CodedIndex.CustomAttributeType:
                bits = 3;
                tables = new [] { Table.Method, Table.MemberRef };
                break;
            case CodedIndex.ResolutionScope:
                bits = 2;
                tables = new [] { Table.Module, Table.ModuleRef, Table.AssemblyRef, Table.TypeRef };
                break;
            case CodedIndex.TypeOrMethodDef:
                bits = 1;
                tables = new [] { Table.TypeDef, Table.Method };
                break;
            case CodedIndex.HasCustomDebugInformation:
                bits = 5;
                tables = new[] {
                    Table.Method, Table.Field, Table.TypeRef, Table.TypeDef, Table.Param, Table.InterfaceImpl, Table.MemberRef,
                    Table.Module, Table.DeclSecurity, Table.Property, Table.Event, Table.StandAloneSig, Table.ModuleRef,
                    Table.TypeSpec, Table.Assembly, Table.AssemblyRef, Table.File, Table.ExportedType,
                    Table.ManifestResource, Table.GenericParam, Table.GenericParamConstraint, Table.MethodSpec,
                    Table.Document, Table.LocalScope, Table.LocalVariable, Table.LocalConstant, Table.ImportScope,
                };
                break;
            default:
                throw new ArgumentException ();
            }

            int max = 0;

            for (int i = 0; i < tables.Length; i++) {
                max = System.Math.Max (counter (tables [i]), max);
            }

            return max < (1 << (16 - bits)) ? 2 : 4;
        }