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357 lines
12 KiB
Python
357 lines
12 KiB
Python
"""
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Mapsforge map file parser (for version 3 files).
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Author: Oliver Gerlich
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References:
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- http://code.google.com/p/mapsforge/wiki/SpecificationBinaryMapFile
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- http://mapsforge.org/
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"""
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from hachoir_parser import Parser
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from hachoir_core.field import (ParserError,
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Bit, Bits, UInt8, UInt16, UInt32, UInt64, String, RawBytes,
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PaddingBits, PaddingBytes,
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Enum, Field, FieldSet, SeekableFieldSet, RootSeekableFieldSet)
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from hachoir_core.endian import LITTLE_ENDIAN, BIG_ENDIAN
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# micro-degrees factor:
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UDEG = float(1000*1000)
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CoordinateEncoding = {
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0: "single delta encoding",
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1: "double delta encoding",
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}
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class UIntVbe(Field):
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def __init__(self, parent, name, description=None):
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Field.__init__(self, parent, name, description=description)
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value = 0
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size = 0
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while True:
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byteValue = ord( self._parent.stream.readBytes(self.absolute_address + (size*8), 1) )
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haveMoreData = (byteValue & 0x80)
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value = value | ((byteValue & 0x7f) << (size*7))
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size += 1
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assert size < 100, "UIntVBE is too large"
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if not(haveMoreData):
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break
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self._size = size*8
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self.createValue = lambda: value
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class IntVbe(Field):
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def __init__(self, parent, name, description=None):
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Field.__init__(self, parent, name, description=description)
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value = 0
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size = 0
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shift = 0
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while True:
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byteValue = ord( self._parent.stream.readBytes(self.absolute_address + (size*8), 1) )
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haveMoreData = (byteValue & 0x80)
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if size == 0:
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isNegative = (byteValue & 0x40)
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value = (byteValue & 0x3f)
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shift += 6
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else:
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value = value | ((byteValue & 0x7f) << shift)
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shift += 7
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size += 1
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assert size < 100, "IntVBE is too large"
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if not(haveMoreData):
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break
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if isNegative:
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value *= -1
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self._size = size*8
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self.createValue = lambda: value
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class VbeString(FieldSet):
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def createFields(self):
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yield UIntVbe(self, "length")
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yield String(self, "chars", self["length"].value, charset="UTF-8")
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def createDescription (self):
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return '(%d B) "%s"' % (self["length"].value, self["chars"].value)
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class TagStringList(FieldSet):
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def createFields(self):
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yield UInt16(self, "num_tags")
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for i in range(self["num_tags"].value):
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yield VbeString(self, "tag[]")
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def createDescription (self):
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return "%d tag strings" % self["num_tags"].value
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class ZoomIntervalCfg(FieldSet):
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def createFields(self):
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yield UInt8(self, "base_zoom_level")
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yield UInt8(self, "min_zoom_level")
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yield UInt8(self, "max_zoom_level")
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yield UInt64(self, "subfile_start")
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yield UInt64(self, "subfile_size")
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def createDescription (self):
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return "zoom level around %d (%d - %d)" % (self["base_zoom_level"].value,
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self["min_zoom_level"].value, self["max_zoom_level"].value)
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class TileIndexEntry(FieldSet):
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def createFields(self):
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yield Bit(self, "is_water_tile")
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yield Bits(self, "offset", 39)
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class TileZoomTable(FieldSet):
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def createFields(self):
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yield UIntVbe(self, "num_pois")
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yield UIntVbe(self, "num_ways")
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def createDescription (self):
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return "%d POIs, %d ways" % (self["num_pois"].value, self["num_ways"].value)
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class TileHeader(FieldSet):
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def __init__ (self, parent, name, zoomIntervalCfg, **kw):
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FieldSet.__init__(self, parent, name, **kw)
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self.zoomIntervalCfg = zoomIntervalCfg
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def createFields(self):
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numLevels = int(self.zoomIntervalCfg["max_zoom_level"].value - self.zoomIntervalCfg["min_zoom_level"].value) +1
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assert(numLevels < 50)
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for i in range(numLevels):
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yield TileZoomTable(self, "zoom_table_entry[]")
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yield UIntVbe(self, "first_way_offset")
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class POIData(FieldSet):
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def createFields(self):
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yield IntVbe(self, "lat_diff")
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yield IntVbe(self, "lon_diff")
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yield Bits(self, "layer", 4)
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yield Bits(self, "num_tags", 4)
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for i in range(self["num_tags"].value):
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yield UIntVbe(self, "tag_id[]")
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yield Bit(self, "have_name")
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yield Bit(self, "have_house_number")
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yield Bit(self, "have_ele")
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yield PaddingBits(self, "pad[]", 5)
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if self["have_name"].value:
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yield VbeString(self, "name")
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if self["have_house_number"].value:
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yield VbeString(self, "house_number")
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if self["have_ele"].value:
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yield IntVbe(self, "ele")
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def createDescription (self):
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s = "POI"
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if self["have_name"].value:
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s += ' "%s"' % self["name"]["chars"].value
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s += " @ %f/%f" % (self["lat_diff"].value / UDEG, self["lon_diff"].value / UDEG)
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return s
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class SubTileBitmap(FieldSet):
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static_size = 2*8
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def createFields(self):
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for y in range(4):
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for x in range(4):
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yield Bit(self, "is_used[%d,%d]" % (x,y))
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class WayProperties(FieldSet):
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def createFields(self):
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yield UIntVbe(self, "way_data_size")
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# WayProperties is split into an outer and an inner field, to allow specifying data size for inner part:
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yield WayPropertiesInner(self, "inner", size=self["way_data_size"].value * 8)
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class WayPropertiesInner(FieldSet):
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def createFields(self):
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yield SubTileBitmap(self, "sub_tile_bitmap")
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#yield Bits(self, "sub_tile_bitmap", 16)
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yield Bits(self, "layer", 4)
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yield Bits(self, "num_tags", 4)
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for i in range(self["num_tags"].value):
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yield UIntVbe(self, "tag_id[]")
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yield Bit(self, "have_name")
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yield Bit(self, "have_house_number")
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yield Bit(self, "have_ref")
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yield Bit(self, "have_label_position")
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yield Bit(self, "have_num_way_blocks")
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yield Enum(Bit(self, "coord_encoding"), CoordinateEncoding)
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yield PaddingBits(self, "pad[]", 2)
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if self["have_name"].value:
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yield VbeString(self, "name")
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if self["have_house_number"].value:
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yield VbeString(self, "house_number")
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if self["have_ref"].value:
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yield VbeString(self, "ref")
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if self["have_label_position"].value:
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yield IntVbe(self, "label_lat_diff")
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yield IntVbe(self, "label_lon_diff")
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numWayDataBlocks = 1
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if self["have_num_way_blocks"].value:
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yield UIntVbe(self, "num_way_blocks")
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numWayDataBlocks = self["num_way_blocks"].value
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for i in range(numWayDataBlocks):
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yield WayData(self, "way_data[]")
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def createDescription (self):
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s = "way"
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if self["have_name"].value:
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s += ' "%s"' % self["name"]["chars"].value
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return s
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class WayData(FieldSet):
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def createFields(self):
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yield UIntVbe(self, "num_coord_blocks")
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for i in range(self["num_coord_blocks"].value):
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yield WayCoordBlock(self, "way_coord_block[]")
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class WayCoordBlock(FieldSet):
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def createFields(self):
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yield UIntVbe(self, "num_way_nodes")
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yield IntVbe(self, "first_lat_diff")
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yield IntVbe(self, "first_lon_diff")
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for i in range(self["num_way_nodes"].value-1):
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yield IntVbe(self, "lat_diff[]")
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yield IntVbe(self, "lon_diff[]")
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class TileData(FieldSet):
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def __init__ (self, parent, name, zoomIntervalCfg, **kw):
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FieldSet.__init__(self, parent, name, **kw)
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self.zoomIntervalCfg = zoomIntervalCfg
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def createFields(self):
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yield TileHeader(self, "tile_header", self.zoomIntervalCfg)
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numLevels = int(self.zoomIntervalCfg["max_zoom_level"].value - self.zoomIntervalCfg["min_zoom_level"].value) +1
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for zoomLevel in range(numLevels):
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zoomTableEntry = self["tile_header"]["zoom_table_entry[%d]" % zoomLevel]
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for poiIndex in range(zoomTableEntry["num_pois"].value):
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yield POIData(self, "poi_data[%d,%d]" % (zoomLevel, poiIndex))
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for zoomLevel in range(numLevels):
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zoomTableEntry = self["tile_header"]["zoom_table_entry[%d]" % zoomLevel]
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for wayIndex in range(zoomTableEntry["num_ways"].value):
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yield WayProperties(self, "way_props[%d,%d]" % (zoomLevel, wayIndex))
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class ZoomSubFile(SeekableFieldSet):
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def __init__ (self, parent, name, zoomIntervalCfg, **kw):
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SeekableFieldSet.__init__(self, parent, name, **kw)
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self.zoomIntervalCfg = zoomIntervalCfg
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def createFields(self):
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indexEntries = []
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numTiles = None
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i = 0
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while True:
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entry = TileIndexEntry(self, "tile_index_entry[]")
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indexEntries.append(entry)
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yield entry
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i+=1
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if numTiles is None:
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# calculate number of tiles (TODO: better calc this from map bounding box)
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firstOffset = self["tile_index_entry[0]"]["offset"].value
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numTiles = firstOffset / 5
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if i >= numTiles:
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break
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for indexEntry in indexEntries:
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self.seekByte(indexEntry["offset"].value, relative=True)
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yield TileData(self, "tile_data[]", zoomIntervalCfg=self.zoomIntervalCfg)
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class MapsforgeMapFile(Parser, RootSeekableFieldSet):
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PARSER_TAGS = {
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"id": "mapsforge_map",
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"category": "misc",
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"file_ext": ("map",),
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"min_size": 62*8,
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"description": "Mapsforge map file",
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}
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endian = BIG_ENDIAN
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def validate(self):
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return self["file_magic"].value == "mapsforge binary OSM" and self["file_version"].value == 3
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def createFields(self):
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yield String(self, "file_magic", 20)
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yield UInt32(self, "header_size")
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yield UInt32(self, "file_version")
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yield UInt64(self, "file_size")
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yield UInt64(self, "creation_date")
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yield UInt32(self, "min_lat")
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yield UInt32(self, "min_lon")
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yield UInt32(self, "max_lat")
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yield UInt32(self, "max_lon")
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yield UInt16(self, "tile_size")
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yield VbeString(self, "projection")
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# flags
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yield Bit(self, "have_debug")
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yield Bit(self, "have_map_start")
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yield Bit(self, "have_start_zoom")
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yield Bit(self, "have_language_preference")
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yield Bit(self, "have_comment")
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yield Bit(self, "have_created_by")
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yield Bits(self, "reserved[]", 2)
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if self["have_map_start"].value:
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yield UInt32(self, "start_lat")
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yield UInt32(self, "start_lon")
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if self["have_start_zoom"].value:
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yield UInt8(self, "start_zoom")
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if self["have_language_preference"].value:
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yield VbeString(self, "language_preference")
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if self["have_comment"].value:
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yield VbeString(self, "comment")
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if self["have_created_by"].value:
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yield VbeString(self, "created_by")
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yield TagStringList(self, "poi_tags")
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yield TagStringList(self, "way_tags")
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yield UInt8(self, "num_zoom_intervals")
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for i in range(self["num_zoom_intervals"].value):
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yield ZoomIntervalCfg(self, "zoom_interval_cfg[]")
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for i in range(self["num_zoom_intervals"].value):
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zoomIntervalCfg = self["zoom_interval_cfg[%d]" % i]
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self.seekByte(zoomIntervalCfg["subfile_start"].value, relative=False)
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yield ZoomSubFile(self, "subfile[]", size=zoomIntervalCfg["subfile_size"].value * 8, zoomIntervalCfg=zoomIntervalCfg)
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