WADParser.py

#!/usr/bin/env python

import struct
import re

class Wad:
    def __init__(self,wadFile):
        self.Maps = []
        self._isHexenFormat = False
        with open(wadFile, "rb") as f:
            identification = f.read(4)
            numlumps, infotableofs = struct.unpack("<II", f.read(8))
            data = f.read(infotableofs-12)
    
            currentMap = Map(None)
    
            lump = f.read(16)
            while lump != "":
                # Do stuff with byte.
                filepos, size = struct.unpack("<II", lump[0:8])
                name = lump[8:16].rstrip('\0')
    
                filepos = filepos-12
                if(re.match('E\dM\d|MAP\d\d', name)):
                    if(currentMap.Name is not None):
                        self.Maps.append(currentMap)
                    currentMap = Map(name)
                elif name == 'BEHAVIOR':
                    self._isHexenFormat = True
                else:
                    currentMap.Lumps[name] = data[filepos:filepos+size]
                lump = f.read(16)
            self.Maps.append(currentMap)

        for level in self.Maps:
            level.load(self._isHexenFormat)

    @staticmethod
    def split(n, data):
        size = len(data)
        index = 0
        while index < size:
            yield data[index : index+n]
            index = index + n
        return

class Map:
    def __init__(self,name):
        self.Name = name
        self.Lumps = dict()
        self._Vertices = []
        self.min = None
        self.max = None
        self.shift = None
        self._Lines = []

    def _readVerticies(self):
        for vertex in Wad.split(4, self.Lumps['VERTEXES']):
            x,y = struct.unpack('<hh', vertex[0:4])
            
            self._Vertices.append((x,y))
            if self.min is None:
                self.min = (x,y)
            else:
                self.min = (min(x, self.min[0]), min(y, self.min[1]))
            if self.max is None:
                self.max = (x,y)
            else:
                self.max = (max(x, self.max[0]), max(y, self.max[1]))
        self.shift = (0-self.min[0],0-self.min[1])

    def _readLines(self,isHexenFormat):
        lineSize = 16 if isHexenFormat else 14

        for data in Wad.split(lineSize, self.Lumps['LINEDEFS']):
            self._Lines.append(Line(data))

    def readThings(self, data):
        print 'Reading things'

    def normalize(self,point,padding=5):
        return (self.shift[0]+point[0]+padding,self.shift[1]+point[1]+padding)

    def load(self, isHexenFormat):
        self._readVerticies()
        self._readLines(isHexenFormat)

    def saveSVG(self):
        import svgwrite
        viewPortSize = self.normalize(self.max, 10)
        canvasSize = (1024,1024)

        dwg = svgwrite.Drawing(self.Name+'.svg', profile='tiny', size=canvasSize , viewBox=('0 0 '+str(viewPortSize[0])+' '+str(viewPortSize[1])))
        for line in self._Lines:
            a = self.normalize(self._Vertices[line.A])
            b = self.normalize(self._Vertices[line.B])
            if line.LeftSide == -1 or line.RightSide == -1:
                dwg.add(dwg.line(a, b, stroke='#333', stroke_width=10))
            else:
                dwg.add(dwg.line(a, b, stroke='#999', stroke_width=3))

        dwg.save()

class Line:
    def __init__(self,data):
        self.A, self.B = struct.unpack('<hh', data[0:4])
        self.LeftSide, self.RightSide = struct.unpack('<hh', data[-4:])

    def __repr__(self):
        return '('+str(self.A)+','+str(self.B)+')'

if __name__ == "__main__":
    import sys

    if len(sys.argv) > 1:
        wad = Wad(sys.argv[1])
        for level in wad.Maps:
            level.saveSVG()
    else:
        print 'You need to pass a WAD file as the only argument'