chore: import upstream snapshot with attribution

server/functions/framework/c_conversion.go

@@ -0,0 +1,74 @@
+// Copyright 2025 Dolthub, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package framework
+
+import (
+	"github.com/dolthub/doltgresql/core/extensions/pg_extension"
+
+	"github.com/dolthub/doltgresql/core/id"
+	"github.com/dolthub/doltgresql/postgres/parser/uuid"
+	pgtypes "github.com/dolthub/doltgresql/server/types"
+)
+
+var cConversionToDatumMap = map[id.Type]func(val any) (pg_extension.NullableDatum, error){
+	pgtypes.Text.ID: textToDatum,
+	pgtypes.Uuid.ID: uuidToDatum,
+}
+var cConversionFromDatumMap = map[id.Type]func(datum pg_extension.Datum) (any, error){
+	pgtypes.Text.ID: textFromDatum,
+	pgtypes.Uuid.ID: uuidFromDatum,
+}
+
+// textFromDatum converts from a Datum to a TEXT value.
+func textFromDatum(datum pg_extension.Datum) (any, error) {
+	convertedVal := pg_extension.FromDatumGoString(datum)
+	pg_extension.FreeDatum(datum)
+	return convertedVal, nil
+}
+
+// textToDatum converts from a TEXT value to a NullableDatum.
+func textToDatum(val any) (pg_extension.NullableDatum, error) {
+	if val == nil {
+		return pg_extension.NullableDatum{
+			Value:  0,
+			IsNull: true,
+		}, nil
+	}
+	return pg_extension.NullableDatum{
+		Value:  pg_extension.ToDatumGoString(val.(string)),
+		IsNull: false,
+	}, nil
+}
+
+// uuidFromDatum converts from a Datum to a UUID value.
+func uuidFromDatum(datum pg_extension.Datum) (any, error) {
+	convertedVal := pg_extension.FromDatumGoBytes(datum, 16)
+	pg_extension.FreeDatum(datum)
+	return uuid.FromBytes(convertedVal)
+}
+
+// uuidToDatum converts from a UUID value to a NullableDatum.
+func uuidToDatum(val any) (pg_extension.NullableDatum, error) {
+	if val == nil {
+		return pg_extension.NullableDatum{
+			Value:  0,
+			IsNull: true,
+		}, nil
+	}
+	return pg_extension.NullableDatum{
+		Value:  pg_extension.ToDatumGoBytes(val.(uuid.UUID).GetBytes()),
+		IsNull: false,
+	}, nil
+}