def makeHeaderBlock(self, osmVersion, phyghtmapVersion):
headerBlock = []
# bbox, id=1
bbox = self.makeHeaderBBox()
headerBlock.append(self.makeVar("S", 1, bbox))
# required_features, id=4
requiredFeatures = [
writableString("OsmSchema-V{0:.1f}".format(osmVersion)),
writableString("DenseNodes"),
]
for requiredFeature in requiredFeatures:
headerBlock.append(self.makeVar("S", 4, requiredFeature))
# writingprogram, id=16
writingprogram = writableString(
"phyghtmap {0:s} (http://wiki.openstreetmap.org/wiki/phyghtmap)".
format(phyghtmapVersion))
headerBlock.append(self.makeVar("S", 16, writingprogram))
return join(headerBlock)
def makeStringPair(self, a, b=None):
"""format a string pair according to the o5m specification.
<a> and <b> are two strings; <b> can be None.
"""
string = chr(0) + a + chr(0)
if b != None:
string += b + chr(0)
return writableString(string)
def writeWaysChunk(self, ways, startWayId):
blobHeader = []
# type, id=1
blobHeader.append(
self.makeVar(vType="S", vId=1, content=writableString("OSMData")))
# datasize, id=3
blobHeader.append(self.makeVarIdent(vType="V", vId=3))
blob = self.makeWayBlob(startWayId, ways)
blobHeader.append(int2str(len(blob)))
blobHeader = join(blobHeader)
self.outf.write(pack('!L', len(blobHeader)))
self.outf.write(blobHeader)
self.outf.write(blob)
def makeHeader(self, osmVersion, phyghtmapVersion):
blobHeader = []
# type, id=1
blobHeader.append(self.makeVarIdent(vType="S", vId=1))
# len("OSMHeader") == 9
blobHeader.append(int2str(9))
blobHeader.append(writableString("OSMHeader"))
# datasize, id=3
blobHeader.append(self.makeVarIdent(vType="V", vId=3))
blob = self.makeHeaderBlob(osmVersion, phyghtmapVersion)
blobHeader.append(int2str(len(blob)))
blobHeader = join(blobHeader)
self.outf.write(pack('!L', len(blobHeader)))
self.outf.write(blobHeader)
self.outf.write(blob)
def __init__(self,
filename,
osmVersion,
phyghtmapVersion,
bbox=[],
elevClassifier=None):
self.outf = open(filename, "wb")
self.bbox = bbox
self.granularity = 100
self.date_granularity = 1000
self.elevClassifier = elevClassifier
self.maxNodesPerNodeBlock = 8000
self.maxNodesPerWayBlock = 32000
self.timestamp = int(time.mktime(time.localtime()))
self.timestampString = writableString(
"") # dummy attribute, needed by main.py
self.makeHeader(osmVersion, phyghtmapVersion)
def writeHeader(self, osmVersion, phyghtmapVersion):
# write reset
self.writeReset()
header = []
#file format dataset (0xe0), length (0x04), format (o5m2)
header.extend(
[writableInt(0xe0),
writableInt(0x04),
writableString("o5m2")])
# timestamp dataset
timestampDataset = self.makeTimestampDataset()
header.append(timestampDataset)
# bounding box dataset
bboxDataset = self.makeBBoxDataset()
header.append(bboxDataset)
#write the header
self.outf.write(join(header))
def makeStringTable(self, stringList):
"""takes a list of str objects and returns a stringtable variable.
"""
# s, id=1
return join(
[self.makeVar("S", 1, writableString(s)) for s in stringList])
def write(self, output):
self.outF.write(writableString(output))