source: osm/applications/editors/josm/plugins/seachart/src/s57/S57dec.java@ 34652

Last change on this file since 34652 was 32907, checked in by donvip, 8 years ago

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File size: 9.5 KB
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1// License: GPL. For details, see LICENSE file.
2package s57;
3
4import java.io.FileInputStream;
5import java.io.IOException;
6
7import s57.S57dat.S57field;
8import s57.S57dat.S57subf;
9import s57.S57map.Nflag;
10
11/**
12 * @author Malcolm Herring
13 */
14public final class S57dec { // S57 ENC file input & map conversion
15 private S57dec() {
16 // Hide default constructor for utilities classes
17 }
18 // CHECKSTYLE.OFF: LineLength
19
20 public static void decodeChart(FileInputStream in, S57map map) throws IOException {
21 S57dat.rnum = 0;
22 byte[] leader = new byte[24];
23 byte[] record = new byte[0];
24 boolean ddr = false;
25 int length = 0;
26 int fields = 0;;
27 int mapfl, mapfp, mapts, entry;
28 String tag;
29 int len;
30 int pos;
31 boolean inFeature = false;
32
33 double comf = 1;
34 double somf = 1;
35 long name = 0;
36 S57map.Nflag nflag = Nflag.ANON;
37 S57map.Pflag pflag = S57map.Pflag.NOSP;
38 long objl = 0;
39
40 while (in.read(leader) == 24) {
41 try {
42 length = Integer.parseInt(new String(leader, 0, 5)) - 24;
43 record = new byte[length];
44 ddr = (leader[6] == 'L');
45 fields = Integer.parseInt(new String(leader, 12, 5)) - 24;
46 } catch (Exception e) {
47 System.err.println("Invalid file format - Encrypted/compressed ENC file?");
48 System.exit(-1);
49 }
50 mapfl = leader[20] - '0';
51 mapfp = leader[21] - '0';
52 mapts = leader[23] - '0';
53 entry = mapfl + mapfp + mapts;
54 if (in.read(record) != length)
55 break;
56 for (int idx = 0; idx < fields-1; idx += entry) {
57 tag = new String(record, idx, mapts);
58 len = Integer.parseInt(new String(record, idx+mapts, mapfl));
59 pos = Integer.parseInt(new String(record, idx+mapts+mapfl, mapfp));
60 if (!ddr) {
61 switch (tag.toString()) {
62 case "0001":
63 int i8rn = ((Long) S57dat.decSubf(record, fields + pos, S57field.I8RI, S57subf.I8RN)).intValue();
64 // if (i8rn != ++S57dat.rnum) {
65 // System.err.println("Out of order record ID");
66 // in.close();
67 // System.exit(-1);
68 // }
69 break;
70 case "DSSI":
71 S57dat.decSubf(record, fields + pos, S57field.DSSI, S57subf.AALL);
72 S57dat.decSubf(S57subf.NALL);
73 break;
74 case "DSPM":
75 comf = (Long) S57dat.decSubf(record, fields + pos, S57field.DSPM, S57subf.COMF);
76 somf = (Long) S57dat.decSubf(S57subf.SOMF);
77 break;
78 case "FRID":
79 inFeature = true;
80 switch (((Long) S57dat.decSubf(record, fields + pos, S57field.FRID, S57subf.PRIM)).intValue()) {
81 case 1:
82 pflag = S57map.Pflag.POINT;
83 break;
84 case 2:
85 pflag = S57map.Pflag.LINE;
86 break;
87 case 3:
88 pflag = S57map.Pflag.AREA;
89 break;
90 default:
91 pflag = S57map.Pflag.NOSP;
92 }
93 objl = (Long) S57dat.decSubf(S57subf.OBJL);
94 break;
95 case "FOID":
96 name = (long) S57dat.decSubf(record, fields + pos, S57field.LNAM, S57subf.LNAM);
97 map.newFeature(name, pflag, objl);
98 break;
99 case "ATTF":
100 S57dat.setField(record, fields + pos, S57field.ATTF, len);
101 do {
102 long attl = (Long) S57dat.decSubf(S57subf.ATTL);
103 String atvl = ((String) S57dat.decSubf(S57subf.ATVL)).trim();
104 if (!atvl.isEmpty()) {
105 map.newAtt(attl, atvl);
106 }
107 } while (S57dat.more());
108 break;
109 case "FFPT":
110 S57dat.setField(record, fields + pos, S57field.FFPT, len);
111 do {
112 name = (long) S57dat.decSubf(S57subf.LNAM);
113 int rind = ((Long) S57dat.decSubf(S57subf.RIND)).intValue();
114 S57dat.decSubf(S57subf.COMT);
115 map.refObj(name, rind);
116 } while (S57dat.more());
117 break;
118 case "FSPT":
119 S57dat.setField(record, fields + pos, S57field.FSPT, len);
120 do {
121 name = (long) S57dat.decSubf(S57subf.NAME) << 16;
122 map.newPrim(name, (Long) S57dat.decSubf(S57subf.ORNT), (Long) S57dat.decSubf(S57subf.USAG));
123 S57dat.decSubf(S57subf.MASK);
124 } while (S57dat.more());
125 break;
126 case "VRID":
127 inFeature = false;
128 name = (Long) S57dat.decSubf(record, fields + pos, S57field.VRID, S57subf.RCNM);
129 switch ((int) name) {
130 case 110:
131 nflag = Nflag.ISOL;
132 break;
133 case 120:
134 nflag = Nflag.CONN;
135 break;
136 default:
137 nflag = Nflag.ANON;
138 break;
139 }
140 name <<= 32;
141 name += (long) S57dat.decSubf(S57subf.RCID);
142 name <<= 16;
143 if (nflag == Nflag.ANON) {
144 map.newEdge(name);
145 }
146 break;
147 case "VRPT":
148 S57dat.setField(record, fields + pos, S57field.VRPT, len);
149 do {
150 long conn = (Long) S57dat.decSubf(S57subf.NAME) << 16;
151 int topi = ((Long) S57dat.decSubf(S57subf.TOPI)).intValue();
152 map.addConn(conn, topi);
153 S57dat.decSubf(S57subf.MASK);
154 } while (S57dat.more());
155 break;
156 case "SG2D":
157 S57dat.setField(record, fields + pos, S57field.SG2D, len);
158 do {
159 double lat = (double) ((Long) S57dat.decSubf(S57subf.YCOO)) / comf;
160 double lon = (double) ((Long) S57dat.decSubf(S57subf.XCOO)) / comf;
161 if (nflag == Nflag.ANON) {
162 map.newNode(++name, lat, lon, nflag);
163 } else {
164 map.newNode(name, lat, lon, nflag);
165 }
166 lat = Math.toRadians(lat);
167 lon = Math.toRadians(lon);
168 if (lat < map.bounds.minlat)
169 map.bounds.minlat = lat;
170 if (lat > map.bounds.maxlat)
171 map.bounds.maxlat = lat;
172 if (lon < map.bounds.minlon)
173 map.bounds.minlon = lon;
174 if (lon > map.bounds.maxlon)
175 map.bounds.maxlon = lon;
176 } while (S57dat.more());
177 break;
178 case "SG3D":
179 S57dat.setField(record, fields + pos, S57field.SG3D, len);
180 do {
181 double lat = (double) ((Long) S57dat.decSubf(S57subf.YCOO)) / comf;
182 double lon = (double) ((Long) S57dat.decSubf(S57subf.XCOO)) / comf;
183 double depth = (double) ((Long) S57dat.decSubf(S57subf.VE3D)) / somf;
184 map.newNode(name++, lat, lon, depth);
185 lat = Math.toRadians(lat);
186 lon = Math.toRadians(lon);
187 if (lat < map.bounds.minlat)
188 map.bounds.minlat = lat;
189 if (lat > map.bounds.maxlat)
190 map.bounds.maxlat = lat;
191 if (lon < map.bounds.minlon)
192 map.bounds.minlon = lon;
193 if (lon > map.bounds.maxlon)
194 map.bounds.maxlon = lon;
195 } while (S57dat.more());
196 break;
197 default:
198 break;
199 }
200 }
201 if (inFeature) {
202 map.endFeature();
203 inFeature = false;
204 }
205 }
206 }
207 map.endFile();
208 in.close();
209
210 return;
211 }
212
213}
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