Mercurial > gemma
view pkg/mesh/meshserialize.go @ 5686:c33a5354328d sr-v2
Add stubs for de/serialize v2 meshes.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 12 Feb 2024 01:17:22 +0100 |
parents | a87900c0fd11 |
children | 8ff842858434 |
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// This is Free Software under GNU Affero General Public License v >= 3.0 // without warranty, see README.md and license for details. // // SPDX-License-Identifier: AGPL-3.0-or-later // License-Filename: LICENSES/AGPL-3.0.txt // // Copyright (C) 2018 by via donau // – Österreichische Wasserstraßen-Gesellschaft mbH // Software engineering by Intevation GmbH // // Author(s): // * Sascha L. Teichmann <sascha.teichmann@intevation.de> package mesh import ( "bufio" "bytes" "compress/gzip" "encoding/binary" "fmt" "io" ) const Version = 1 const magicHeader = "SR3D" func coalesceVersion(version int) int { if version > 0 { return version } return Version } func (s *STRTree) OptimizeForSerialization(version int) { version = coalesceVersion(version) if version == 2 { s.optimizeForSerializationV2() } } // Bytes serializes this tree to a byte slice. 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, 0, err } version = coalesceVersion(version) if err := s.serializeVn(w, version); err != nil { return nil, 0, err } if err := w.Close(); err != nil { return nil, 0, err } return buf.Bytes(), version, nil } func (s *STRTree) serializeVn(w io.Writer, version int) error { switch version { case 1: return s.serializeV1(w) case 2: return s.serializeV2(w) default: return fmt.Errorf("cannot serialize mesh version %d", version) } } // FromBytes restores a STRTree from a binary representation. func (s *STRTree) FromBytes(data []byte, version int) error { version = coalesceVersion(version) r, err := gzip.NewReader(bytes.NewReader(data)) if err != nil { return err } return s.deserialize(bufio.NewReader(r), version) } func (s *STRTree) deserialize(r *bufio.Reader, version int) error { header, err := r.Peek(8) if err != nil { return err } if bytes.HasPrefix(header, []byte(magicHeader)) { realVersion := int(binary.LittleEndian.Uint32(header[4:])) if realVersion != version { return fmt.Errorf("mesh version mismatch: Have %d expect %d", realVersion, version) } return s.deserializeVn(r, realVersion) } return s.deserializeV1(r) } func (s *STRTree) deserializeVn(r *bufio.Reader, version int) error { switch version { case 1: return s.deserializeV1(r) case 2: return s.deserializeV2(r) default: return fmt.Errorf("cannot deserialize mesh version %d", version) } }