Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | // Copyright (c) 1999-2004 Brian Wellington (bwelling@xbill.org) |
| 2 | |
| 3 | package org.xbill.DNS; |
| 4 | |
| 5 | import java.io.*; |
| 6 | import java.text.*; |
| 7 | |
| 8 | /** |
| 9 | * Location - describes the physical location of hosts, networks, subnets. |
| 10 | * |
| 11 | * @author Brian Wellington |
| 12 | */ |
| 13 | |
| 14 | public class LOCRecord extends Record { |
| 15 | |
| 16 | private static final long serialVersionUID = 9058224788126750409L; |
| 17 | |
| 18 | private static NumberFormat w2, w3; |
| 19 | |
| 20 | private long size, hPrecision, vPrecision; |
| 21 | private long latitude, longitude, altitude; |
| 22 | |
| 23 | static { |
| 24 | w2 = new DecimalFormat(); |
| 25 | w2.setMinimumIntegerDigits(2); |
| 26 | |
| 27 | w3 = new DecimalFormat(); |
| 28 | w3.setMinimumIntegerDigits(3); |
| 29 | } |
| 30 | |
| 31 | LOCRecord() {} |
| 32 | |
| 33 | Record |
| 34 | getObject() { |
| 35 | return new LOCRecord(); |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * Creates an LOC Record from the given data |
| 40 | * @param latitude The latitude of the center of the sphere |
| 41 | * @param longitude The longitude of the center of the sphere |
| 42 | * @param altitude The altitude of the center of the sphere, in m |
| 43 | * @param size The diameter of a sphere enclosing the described entity, in m. |
| 44 | * @param hPrecision The horizontal precision of the data, in m. |
| 45 | * @param vPrecision The vertical precision of the data, in m. |
| 46 | */ |
| 47 | public |
| 48 | LOCRecord(Name name, int dclass, long ttl, double latitude, double longitude, |
| 49 | double altitude, double size, double hPrecision, double vPrecision) |
| 50 | { |
| 51 | super(name, Type.LOC, dclass, ttl); |
| 52 | this.latitude = (long)(latitude * 3600 * 1000 + (1L << 31)); |
| 53 | this.longitude = (long)(longitude * 3600 * 1000 + (1L << 31)); |
| 54 | this.altitude = (long)((altitude + 100000) * 100); |
| 55 | this.size = (long)(size * 100); |
| 56 | this.hPrecision = (long)(hPrecision * 100); |
| 57 | this.vPrecision = (long)(vPrecision * 100); |
| 58 | } |
| 59 | |
| 60 | void |
| 61 | rrFromWire(DNSInput in) throws IOException { |
| 62 | int version; |
| 63 | |
| 64 | version = in.readU8(); |
| 65 | if (version != 0) |
| 66 | throw new WireParseException("Invalid LOC version"); |
| 67 | |
| 68 | size = parseLOCformat(in.readU8()); |
| 69 | hPrecision = parseLOCformat(in.readU8()); |
| 70 | vPrecision = parseLOCformat(in.readU8()); |
| 71 | latitude = in.readU32(); |
| 72 | longitude = in.readU32(); |
| 73 | altitude = in.readU32(); |
| 74 | } |
| 75 | |
| 76 | private double |
| 77 | parseFixedPoint(String s) |
| 78 | { |
| 79 | if (s.matches("^-?\\d+$")) |
| 80 | return Integer.parseInt(s); |
| 81 | else if (s.matches("^-?\\d+\\.\\d*$")) { |
| 82 | String [] parts = s.split("\\."); |
| 83 | double value = Integer.parseInt(parts[0]); |
| 84 | double fraction = Integer.parseInt(parts[1]); |
| 85 | if (value < 0) |
| 86 | fraction *= -1; |
| 87 | int digits = parts[1].length(); |
| 88 | return value + (fraction / Math.pow(10, digits)); |
| 89 | } else |
| 90 | throw new NumberFormatException(); |
| 91 | } |
| 92 | |
| 93 | private long |
| 94 | parsePosition(Tokenizer st, String type) throws IOException { |
| 95 | boolean isLatitude = type.equals("latitude"); |
| 96 | int deg = 0, min = 0; |
| 97 | double sec = 0; |
| 98 | long value; |
| 99 | String s; |
| 100 | |
| 101 | deg = st.getUInt16(); |
| 102 | if (deg > 180 || (deg > 90 && isLatitude)) |
| 103 | throw st.exception("Invalid LOC " + type + " degrees"); |
| 104 | |
| 105 | s = st.getString(); |
| 106 | try { |
| 107 | min = Integer.parseInt(s); |
| 108 | if (min < 0 || min > 59) |
| 109 | throw st.exception("Invalid LOC " + type + " minutes"); |
| 110 | s = st.getString(); |
| 111 | sec = parseFixedPoint(s); |
| 112 | if (sec < 0 || sec >= 60) |
| 113 | throw st.exception("Invalid LOC " + type + " seconds"); |
| 114 | s = st.getString(); |
| 115 | } catch (NumberFormatException e) { |
| 116 | } |
| 117 | |
| 118 | if (s.length() != 1) |
| 119 | throw st.exception("Invalid LOC " + type); |
| 120 | |
| 121 | value = (long) (1000 * (sec + 60L * (min + 60L * deg))); |
| 122 | |
| 123 | char c = Character.toUpperCase(s.charAt(0)); |
| 124 | if ((isLatitude && c == 'S') || (!isLatitude && c == 'W')) |
| 125 | value = -value; |
| 126 | else if ((isLatitude && c != 'N') || (!isLatitude && c != 'E')) |
| 127 | throw st.exception("Invalid LOC " + type); |
| 128 | |
| 129 | value += (1L << 31); |
| 130 | |
| 131 | return value; |
| 132 | } |
| 133 | |
| 134 | private long |
| 135 | parseDouble(Tokenizer st, String type, boolean required, long min, long max, |
| 136 | long defaultValue) |
| 137 | throws IOException |
| 138 | { |
| 139 | Tokenizer.Token token = st.get(); |
| 140 | if (token.isEOL()) { |
| 141 | if (required) |
| 142 | throw st.exception("Invalid LOC " + type); |
| 143 | st.unget(); |
| 144 | return defaultValue; |
| 145 | } |
| 146 | String s = token.value; |
| 147 | if (s.length() > 1 && s.charAt(s.length() - 1) == 'm') |
| 148 | s = s.substring(0, s.length() - 1); |
| 149 | try { |
| 150 | long value = (long)(100 * parseFixedPoint(s)); |
| 151 | if (value < min || value > max) |
| 152 | throw st.exception("Invalid LOC " + type); |
| 153 | return value; |
| 154 | } |
| 155 | catch (NumberFormatException e) { |
| 156 | throw st.exception("Invalid LOC " + type); |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | void |
| 161 | rdataFromString(Tokenizer st, Name origin) throws IOException { |
| 162 | latitude = parsePosition(st, "latitude"); |
| 163 | longitude = parsePosition(st, "longitude"); |
| 164 | altitude = parseDouble(st, "altitude", true, |
| 165 | -10000000, 4284967295L, 0) + 10000000; |
| 166 | size = parseDouble(st, "size", false, 0, 9000000000L, 100); |
| 167 | hPrecision = parseDouble(st, "horizontal precision", false, |
| 168 | 0, 9000000000L, 1000000); |
| 169 | vPrecision = parseDouble(st, "vertical precision", false, |
| 170 | 0, 9000000000L, 1000); |
| 171 | } |
| 172 | |
| 173 | private void |
| 174 | renderFixedPoint(StringBuffer sb, NumberFormat formatter, long value, |
| 175 | long divisor) |
| 176 | { |
| 177 | sb.append(value / divisor); |
| 178 | value %= divisor; |
| 179 | if (value != 0) { |
| 180 | sb.append("."); |
| 181 | sb.append(formatter.format(value)); |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | private String |
| 186 | positionToString(long value, char pos, char neg) { |
| 187 | StringBuffer sb = new StringBuffer(); |
| 188 | char direction; |
| 189 | |
| 190 | long temp = value - (1L << 31); |
| 191 | if (temp < 0) { |
| 192 | temp = -temp; |
| 193 | direction = neg; |
| 194 | } else |
| 195 | direction = pos; |
| 196 | |
| 197 | sb.append(temp / (3600 * 1000)); /* degrees */ |
| 198 | temp = temp % (3600 * 1000); |
| 199 | sb.append(" "); |
| 200 | |
| 201 | sb.append(temp / (60 * 1000)); /* minutes */ |
| 202 | temp = temp % (60 * 1000); |
| 203 | sb.append(" "); |
| 204 | |
| 205 | renderFixedPoint(sb, w3, temp, 1000); /* seconds */ |
| 206 | sb.append(" "); |
| 207 | |
| 208 | sb.append(direction); |
| 209 | |
| 210 | return sb.toString(); |
| 211 | } |
| 212 | |
| 213 | |
| 214 | /** Convert to a String */ |
| 215 | String |
| 216 | rrToString() { |
| 217 | StringBuffer sb = new StringBuffer(); |
| 218 | |
| 219 | /* Latitude */ |
| 220 | sb.append(positionToString(latitude, 'N', 'S')); |
| 221 | sb.append(" "); |
| 222 | |
| 223 | /* Latitude */ |
| 224 | sb.append(positionToString(longitude, 'E', 'W')); |
| 225 | sb.append(" "); |
| 226 | |
| 227 | /* Altitude */ |
| 228 | renderFixedPoint(sb, w2, altitude - 10000000, 100); |
| 229 | sb.append("m "); |
| 230 | |
| 231 | /* Size */ |
| 232 | renderFixedPoint(sb, w2, size, 100); |
| 233 | sb.append("m "); |
| 234 | |
| 235 | /* Horizontal precision */ |
| 236 | renderFixedPoint(sb, w2, hPrecision, 100); |
| 237 | sb.append("m "); |
| 238 | |
| 239 | /* Vertical precision */ |
| 240 | renderFixedPoint(sb, w2, vPrecision, 100); |
| 241 | sb.append("m"); |
| 242 | |
| 243 | return sb.toString(); |
| 244 | } |
| 245 | |
| 246 | /** Returns the latitude */ |
| 247 | public double |
| 248 | getLatitude() { |
| 249 | return ((double)(latitude - (1L << 31))) / (3600 * 1000); |
| 250 | } |
| 251 | |
| 252 | /** Returns the longitude */ |
| 253 | public double |
| 254 | getLongitude() { |
| 255 | return ((double)(longitude - (1L << 31))) / (3600 * 1000); |
| 256 | } |
| 257 | |
| 258 | /** Returns the altitude */ |
| 259 | public double |
| 260 | getAltitude() { |
| 261 | return ((double)(altitude - 10000000)) / 100; |
| 262 | } |
| 263 | |
| 264 | /** Returns the diameter of the enclosing sphere */ |
| 265 | public double |
| 266 | getSize() { |
| 267 | return ((double)size) / 100; |
| 268 | } |
| 269 | |
| 270 | /** Returns the horizontal precision */ |
| 271 | public double |
| 272 | getHPrecision() { |
| 273 | return ((double)hPrecision) / 100; |
| 274 | } |
| 275 | |
| 276 | /** Returns the horizontal precision */ |
| 277 | public double |
| 278 | getVPrecision() { |
| 279 | return ((double)vPrecision) / 100; |
| 280 | } |
| 281 | |
| 282 | void |
| 283 | rrToWire(DNSOutput out, Compression c, boolean canonical) { |
| 284 | out.writeU8(0); /* version */ |
| 285 | out.writeU8(toLOCformat(size)); |
| 286 | out.writeU8(toLOCformat(hPrecision)); |
| 287 | out.writeU8(toLOCformat(vPrecision)); |
| 288 | out.writeU32(latitude); |
| 289 | out.writeU32(longitude); |
| 290 | out.writeU32(altitude); |
| 291 | } |
| 292 | |
| 293 | private static long |
| 294 | parseLOCformat(int b) throws WireParseException { |
| 295 | long out = b >> 4; |
| 296 | int exp = b & 0xF; |
| 297 | if (out > 9 || exp > 9) |
| 298 | throw new WireParseException("Invalid LOC Encoding"); |
| 299 | while (exp-- > 0) |
| 300 | out *= 10; |
| 301 | return (out); |
| 302 | } |
| 303 | |
| 304 | private int |
| 305 | toLOCformat(long l) { |
| 306 | byte exp = 0; |
| 307 | while (l > 9) { |
| 308 | exp++; |
| 309 | l /= 10; |
| 310 | } |
| 311 | return (int)((l << 4) + exp); |
| 312 | } |
| 313 | |
| 314 | } |