Mercurial > gemma

annotate pkg/mesh/meshserialize.go @ 5691:9d2e74225104 sr-v2

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Some refactoring to clean up deserialization.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 12 Feb 2024 12:48:07 +0100
parents da9720b4aa42
children d920f0fa2f04
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1017
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2018 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
4827
f4abfd0ee8ad Renamed octree package to mesh as there is no octree any more.
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14 package mesh
674
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15
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16 import (
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17 "bufio"
727
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18 "bytes"
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19 "compress/gzip"
674
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20 "encoding/binary"
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21 "fmt"
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22 "io"
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23
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24 "gemma.intevation.de/gemma/pkg/log"
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25 )
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26
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27 const Version = 1
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28
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29 const magicHeader = "SR3D"
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30
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31 func coalesceVersion(version int) int {
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32 if version > 0 {
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33 return version
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34 }
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35 return Version
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36 }
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37
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38 func (s *STRTree) OptimizeForSerialization(version int) {
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39 version = coalesceVersion(version)
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40 if version == 2 {
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41 s.optimizeForSerializationV2()
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42 }
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43 }
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44
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45 // Bytes serializes this tree to a byte slice.
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46 func (s *STRTree) Bytes(version int) ([]byte, int, error) {
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47
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48 var buf bytes.Buffer
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49 w, err := gzip.NewWriterLevel(&buf, gzip.BestSpeed)
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50 if err != nil {
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51 return nil, 0, err
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52 }
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53
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54 version = coalesceVersion(version)
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55 if err := s.serializeVn(w, version); err != nil {
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56 return nil, 0, err
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57 }
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58
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59 if err := w.Close(); err != nil {
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60 return nil, 0, err
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61 }
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62
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63 return buf.Bytes(), version, nil
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64 }
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65
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66 func (s *STRTree) serializeVn(w io.Writer, version int) error {
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67 switch version {
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68 case 1:
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69 return s.serializeV1(w)
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70 case 2:
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71 return s.serializeV2(w)
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72 default:
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73 return fmt.Errorf("cannot serialize mesh version %d", version)
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74 }
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75 }
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76
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77 // FromBytes restores a STRTree from a binary representation.
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78 func (s *STRTree) FromBytes(data []byte, version int) error {
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79 version = coalesceVersion(version)
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80 r, err := gzip.NewReader(bytes.NewReader(data))
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81 if err != nil {
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82 return err
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83 }
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84 return s.deserialize(bufio.NewReader(r), version)
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85 }
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86
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87 func (s *STRTree) deserialize(r *bufio.Reader, version int) error {
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88
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89 header, err := r.Peek(8)
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90 if err != nil {
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91 return err
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92 }
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93
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94 if bytes.HasPrefix(header, []byte(magicHeader)) {
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95 realVersion := int(binary.LittleEndian.Uint32(header[4:]))
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96 if realVersion != version {
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97 return fmt.Errorf("mesh version mismatch: Have %d expect %d",
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98 realVersion, version)
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99 }
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100 // Skip the header
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101 if _, err := r.Discard(8); err != nil {
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102 return err
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103 }
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104 return s.deserializeVn(r, realVersion)
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105 }
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106
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107 return s.deserializeV1(r)
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108 }
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109
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110 func (s *STRTree) deserializeVn(r *bufio.Reader, version int) error {
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111 switch version {
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112 case 1:
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113 return s.deserializeV1(r)
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114 case 2:
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115 return s.deserializeV2(r)
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116 default:
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117 return fmt.Errorf("cannot deserialize mesh version %d", version)
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118 }
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119 }
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120
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121 // deserializer is a generic function to apply a chain of
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122 // deserializer function to an object given a reader.
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123 func deserializer[T any](
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124 r *bufio.Reader,
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125 t T,
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126 fns ...func(T, *bufio.Reader) error,
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127 ) error {
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128 for _, fn := range fns {
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129 if err := fn(t, r); err != nil {
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130 return err
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131 }
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132 }
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133 return nil
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134 }
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135
5690
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136 func (s *STRTree) serializeEntries(w io.Writer) error {
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137 return binary.Write(w, binary.LittleEndian, uint8(s.Entries))
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138 }
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139
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140 func (s *STRTree) deserializeEntries(r *bufio.Reader) error {
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141 var numEntries uint8
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142 if err := binary.Read(r, binary.LittleEndian, &numEntries); err != nil {
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143 return err
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144 }
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145 s.Entries = int(numEntries)
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146 return nil
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147 }
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148
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149 func (t *Tin) serializeExtent(w io.Writer) error {
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150 if err := t.Min.Write(w); err != nil {
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diff changeset
151 return err
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diff changeset
152 }
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153 return t.Max.Write(w)
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154 }
5691
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155
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156 func (t *Tin) deserializeExtent(r *bufio.Reader) error {
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157 if err := t.Min.Read(r); err != nil {
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158 return err
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159 }
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diff changeset
160 if err := t.Max.Read(r); err != nil {
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diff changeset
161 return err
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diff changeset
162 }
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163 log.Infof("BBOX: [[%f, %f, %f], [%f, %f, %f]]\n",
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diff changeset
164 t.Min.X, t.Min.Y, t.Min.Z,
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diff changeset
165 t.Max.X, t.Max.Y, t.Max.Z)
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diff changeset
166 return nil
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5690
diff changeset
167 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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diff changeset
168
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diff changeset
169 func (t *Tin) serializeEPSG(w io.Writer) error {
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parents: 5690
diff changeset
170 return binary.Write(w, binary.LittleEndian, t.EPSG)
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diff changeset
171 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5690
diff changeset
172
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parents: 5690
diff changeset
173 func (t *Tin) deserializeEPSG(r *bufio.Reader) error {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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diff changeset
174 if err := binary.Read(r, binary.LittleEndian, &t.EPSG); err != nil {
9d2e74225104 Some refactoring to clean up deserialization.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5690
diff changeset
175 return err
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5690
diff changeset
176 }
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parents: 5690
diff changeset
177 log.Infof("EPSG: %d\n", t.EPSG)
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diff changeset
178 return nil
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parents: 5690
diff changeset
179 }