Mercurial > gemma
diff pkg/mesh/meshserialize.go @ 5678:4abbb62d2bed sr-v2
Write mesh version to database.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
---|---|
date | Sun, 11 Feb 2024 10:25:50 +0100 |
parents | a57be8bfb6ea |
children | 03dfbe675842 |
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--- a/pkg/mesh/meshserialize.go Sun Feb 11 09:51:21 2024 +0100 +++ b/pkg/mesh/meshserialize.go Sun Feb 11 10:25:50 2024 +0100 @@ -20,32 +20,59 @@ "encoding/binary" "errors" "fmt" + "io" ) +const Version = 1 + const magicHeader = "SR3D" // Bytes serializes this tree to a byte slice. -func (s *STRTree) Bytes() ([]byte, error) { +func (s *STRTree) Bytes(version *int) ([]byte, int, error) { var buf bytes.Buffer w, err := gzip.NewWriterLevel(&buf, gzip.BestSpeed) if err != nil { - return nil, err + return nil, 0, err } - if err := s.serializeV1(w); err != nil { - return nil, err + var ver int + + if version == nil || *version < 0 { + ver = Version + } + + if err := s.serializeVn(w, ver); err != nil { + return nil, 0, err } if err := w.Close(); err != nil { - return nil, err + return nil, 0, err } - return buf.Bytes(), nil + return buf.Bytes(), ver, nil +} + +func (s *STRTree) serializeVn(w io.Writer, version int) error { + + if version > Version { + return fmt.Errorf( + "cannot serialize mesh version %d. Highest supported version %d", + version, Version) + } + + return s.serializeV1(w) } // FromBytes restores a STRTree from a binary representation. func (s *STRTree) FromBytes(data []byte, version *int64) error { + + if version != nil && *version > Version { + return fmt.Errorf( + "cannot deserialize mesh version %d. Highest supported version %d", + *version, Version) + } + r, err := gzip.NewReader(bytes.NewReader(data)) if err != nil { return err