Edit: LOC.py
# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc. # # Permission to use, copy, modify, and distribute this software and its # documentation for any purpose with or without fee is hereby granted, # provided that the above copyright notice and this permission notice # appear in all copies. # # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. from __future__ import division import struct import dns.exception import dns.rdata from dns._compat import long, xrange, round_py2_compat _pows = tuple(long(10**i) for i in range(0, 11)) # default values are in centimeters _default_size = 100.0 _default_hprec = 1000000.0 _default_vprec = 1000.0 def _exponent_of(what, desc): if what == 0: return 0 exp = None for i in xrange(len(_pows)): if what // _pows[i] == long(0): exp = i - 1 break if exp is None or exp < 0: raise dns.exception.SyntaxError("%s value out of bounds" % desc) return exp def _float_to_tuple(what): if what < 0: sign = -1 what *= -1 else: sign = 1 what = round_py2_compat(what * 3600000) degrees = int(what // 3600000) what -= degrees * 3600000 minutes = int(what // 60000) what -= minutes * 60000 seconds = int(what // 1000) what -= int(seconds * 1000) what = int(what) return (degrees, minutes, seconds, what, sign) def _tuple_to_float(what): value = float(what[0]) value += float(what[1]) / 60.0 value += float(what[2]) / 3600.0 value += float(what[3]) / 3600000.0 return float(what[4]) * value def _encode_size(what, desc): what = long(what) exponent = _exponent_of(what, desc) & 0xF base = what // pow(10, exponent) & 0xF return base * 16 + exponent def _decode_size(what, desc): exponent = what & 0x0F if exponent > 9: raise dns.exception.SyntaxError("bad %s exponent" % desc) base = (what & 0xF0) >> 4 if base > 9: raise dns.exception.SyntaxError("bad %s base" % desc) return long(base) * pow(10, exponent) class LOC(dns.rdata.Rdata): """LOC record @ivar latitude: latitude @type latitude: (int, int, int, int, sign) tuple specifying the degrees, minutes, seconds, milliseconds, and sign of the coordinate. @ivar longitude: longitude @type longitude: (int, int, int, int, sign) tuple specifying the degrees, minutes, seconds, milliseconds, and sign of the coordinate. @ivar altitude: altitude @type altitude: float @ivar size: size of the sphere @type size: float @ivar horizontal_precision: horizontal precision @type horizontal_precision: float @ivar vertical_precision: vertical precision @type vertical_precision: float @see: RFC 1876""" __slots__ = ['latitude', 'longitude', 'altitude', 'size', 'horizontal_precision', 'vertical_precision'] def __init__(self, rdclass, rdtype, latitude, longitude, altitude, size=_default_size, hprec=_default_hprec, vprec=_default_vprec): """Initialize a LOC record instance. The parameters I{latitude} and I{longitude} may be either a 4-tuple of integers specifying (degrees, minutes, seconds, milliseconds), or they may be floating point values specifying the number of degrees. The other parameters are floats. Size, horizontal precision, and vertical precision are specified in centimeters.""" super(LOC, self).__init__(rdclass, rdtype) if isinstance(latitude, int) or isinstance(latitude, long): latitude = float(latitude) if isinstance(latitude, float): latitude = _float_to_tuple(latitude) self.latitude = latitude if isinstance(longitude, int) or isinstance(longitude, long): longitude = float(longitude) if isinstance(longitude, float): longitude = _float_to_tuple(longitude) self.longitude = longitude self.altitude = float(altitude) self.size = float(size) self.horizontal_precision = float(hprec) self.vertical_precision = float(vprec) def to_text(self, origin=None, relativize=True, **kw): if self.latitude[4] > 0: lat_hemisphere = 'N' else: lat_hemisphere = 'S' if self.longitude[4] > 0: long_hemisphere = 'E' else: long_hemisphere = 'W' text = "%d %d %d.%03d %s %d %d %d.%03d %s %0.2fm" % ( self.latitude[0], self.latitude[1], self.latitude[2], self.latitude[3], lat_hemisphere, self.longitude[0], self.longitude[1], self.longitude[2], self.longitude[3], long_hemisphere, self.altitude / 100.0 ) # do not print default values if self.size != _default_size or \ self.horizontal_precision != _default_hprec or \ self.vertical_precision != _default_vprec: text += " %0.2fm %0.2fm %0.2fm" % ( self.size / 100.0, self.horizontal_precision / 100.0, self.vertical_precision / 100.0 ) return text @classmethod def from_text(cls, rdclass, rdtype, tok, origin=None, relativize=True): latitude = [0, 0, 0, 0, 1] longitude = [0, 0, 0, 0, 1] size = _default_size hprec = _default_hprec vprec = _default_vprec latitude[0] = tok.get_int() t = tok.get_string() if t.isdigit(): latitude[1] = int(t) t = tok.get_string() if '.' in t: (seconds, milliseconds) = t.split('.') if not seconds.isdigit(): raise dns.exception.SyntaxError( 'bad latitude seconds value') latitude[2] = int(seconds) if latitude[2] >= 60: raise dns.exception.SyntaxError('latitude seconds >= 60') l = len(milliseconds) if l == 0 or l > 3 or not milliseconds.isdigit(): raise dns.exception.SyntaxError( 'bad latitude milliseconds value') if l == 1: m = 100 elif l == 2: m = 10 else: m = 1 latitude[3] = m * int(milliseconds) t = tok.get_string() elif t.isdigit(): latitude[2] = int(t) t = tok.get_string() if t == 'S': latitude[4] = -1 elif t != 'N': raise dns.exception.SyntaxError('bad latitude hemisphere value') longitude[0] = tok.get_int() t = tok.get_string() if t.isdigit(): longitude[1] = int(t) t = tok.get_string() if '.' in t: (seconds, milliseconds) = t.split('.') if not seconds.isdigit(): raise dns.exception.SyntaxError( 'bad longitude seconds value') longitude[2] = int(seconds) if longitude[2] >= 60: raise dns.exception.SyntaxError('longitude seconds >= 60') l = len(milliseconds) if l == 0 or l > 3 or not milliseconds.isdigit(): raise dns.exception.SyntaxError( 'bad longitude milliseconds value') if l == 1: m = 100 elif l == 2: m = 10 else: m = 1 longitude[3] = m * int(milliseconds) t = tok.get_string() elif t.isdigit(): longitude[2] = int(t) t = tok.get_string() if t == 'W': longitude[4] = -1 elif t != 'E': raise dns.exception.SyntaxError('bad longitude hemisphere value') t = tok.get_string() if t[-1] == 'm': t = t[0: -1] altitude = float(t) * 100.0 # m -> cm token = tok.get().unescape() if not token.is_eol_or_eof(): value = token.value if value[-1] == 'm': value = value[0: -1] size = float(value) * 100.0 # m -> cm token = tok.get().unescape() if not token.is_eol_or_eof(): value = token.value if value[-1] == 'm': value = value[0: -1] hprec = float(value) * 100.0 # m -> cm token = tok.get().unescape() if not token.is_eol_or_eof(): value = token.value if value[-1] == 'm': value = value[0: -1] vprec = float(value) * 100.0 # m -> cm tok.get_eol() return cls(rdclass, rdtype, latitude, longitude, altitude, size, hprec, vprec) def to_wire(self, file, compress=None, origin=None): milliseconds = (self.latitude[0] * 3600000 + self.latitude[1] * 60000 + self.latitude[2] * 1000 + self.latitude[3]) * self.latitude[4] latitude = long(0x80000000) + milliseconds milliseconds = (self.longitude[0] * 3600000 + self.longitude[1] * 60000 + self.longitude[2] * 1000 + self.longitude[3]) * self.longitude[4] longitude = long(0x80000000) + milliseconds altitude = long(self.altitude) + long(10000000) size = _encode_size(self.size, "size") hprec = _encode_size(self.horizontal_precision, "horizontal precision") vprec = _encode_size(self.vertical_precision, "vertical precision") wire = struct.pack("!BBBBIII", 0, size, hprec, vprec, latitude, longitude, altitude) file.write(wire) @classmethod def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin=None): (version, size, hprec, vprec, latitude, longitude, altitude) = \ struct.unpack("!BBBBIII", wire[current: current + rdlen]) if latitude > long(0x80000000): latitude = float(latitude - long(0x80000000)) / 3600000 else: latitude = -1 * float(long(0x80000000) - latitude) / 3600000 if latitude < -90.0 or latitude > 90.0: raise dns.exception.FormError("bad latitude") if longitude > long(0x80000000): longitude = float(longitude - long(0x80000000)) / 3600000 else: longitude = -1 * float(long(0x80000000) - longitude) / 3600000 if longitude < -180.0 or longitude > 180.0: raise dns.exception.FormError("bad longitude") altitude = float(altitude) - 10000000.0 size = _decode_size(size, "size") hprec = _decode_size(hprec, "horizontal precision") vprec = _decode_size(vprec, "vertical precision") return cls(rdclass, rdtype, latitude, longitude, altitude, size, hprec, vprec) def _get_float_latitude(self): return _tuple_to_float(self.latitude) def _set_float_latitude(self, value): self.latitude = _float_to_tuple(value) float_latitude = property(_get_float_latitude, _set_float_latitude, doc="latitude as a floating point value") def _get_float_longitude(self): return _tuple_to_float(self.longitude) def _set_float_longitude(self, value): self.longitude = _float_to_tuple(value) float_longitude = property(_get_float_longitude, _set_float_longitude, doc="longitude as a floating point value")
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