A simple Python program that can read DOOM.Hexen IWAD and PWAD files and render them as SVG see examples at http://jason.sperske.com/wad/

MIT-LICENSE

MIT License

Copyright (c) 2018 Jason Sperske

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
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SOFTWARE.

WADParser.py

#!/usr/bin/env python3

import struct
import re

class Wad(object):
    """Encapsulates the data found inside a WAD file"""

    def __init__(self, wadFile):
        """Each WAD files contains definitions for global attributes as well as map level attributes"""
        self.levels = []
        self.wad_format = 'DOOM' #Assume DOOM format unless 'BEHAVIOR' 
        with open(wadFile, "rb") as f:
            header_size = 12
            self.wad_type = f.read(4)[0]
            self.num_lumps = struct.unpack("<I", f.read(4))[0]
            data = f.read(struct.unpack("<I", f.read(4))[0] - header_size)

            current_level = Level(None) #The first few records of a WAD are not associated with a level

            lump = f.read(16) #Each offset is is part of a packet 16 bytes
            while len(lump) == 16:
                filepos = struct.unpack("<I", lump[0:4])[0] - header_size
                size = struct.unpack("<I", lump[4:8])[0]
                name = lump[8:16].decode('UTF-8').rstrip('\0')
                print(name)
                if(re.match('E\dM\d|MAP\d\d', name)):
                    #Level nodes are named things like E1M1 or MAP01
                    if(current_level.is_valid()):
                        self.levels.append(current_level)
                    
                    current_level = Level(name)
                elif name == 'BEHAVIOR':
                    #This node only appears in Hexen formated WADs
                    self.wad_format = 'HEXEN'
                else:
                    current_level.lumps[name] = data[filepos:filepos+size]

                lump = f.read(16)
            if(current_level.is_valid()):
                self.levels.append(current_level)

        for level in self.levels:
            level.load(self.wad_format)

class Level(object):
    """Represents a level inside a WAD which is a collection of lumps"""
    def __init__(self, name):
        self.name = name
        self.lumps = dict()
        self.vertices = []
        self.lower_left = None
        self.upper_right = None
        self.shift = None
        self.lines = []

    def is_valid(self):
        return self.name is not None and 'VERTEXES' in self.lumps and 'LINEDEFS' in self.lumps

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

    def load(self, wad_format):
        for vertex in packets_of_size(4, self.lumps['VERTEXES']):
            x,y = struct.unpack('<hh', vertex[0:4])
            self.vertices.append((x,y))

        self.lower_left = (min((v[0] for v in self.vertices)), min((v[1] for v in self.vertices)))
        self.upper_right = (max((v[0] for v in self.vertices)), max((v[1] for v in self.vertices)))

        self.shift = (0-self.lower_left[0],0-self.lower_left[1])
        
        packet_size = 16 if wad_format is 'HEXEN' else 14
        for data in packets_of_size(packet_size, self.lumps['LINEDEFS']):
            self.lines.append(Line(data))

    def save_svg(self):
        """ Scale the drawing to fit inside a 1024x1024 canvas (iPhones don't like really large SVGs even if they have the same detail) """
        import svgwrite
        view_box_size = self.normalize(self.upper_right, 10)
        if view_box_size[0] > view_box_size[1]:
            canvas_size = (1024, int(1024*(float(view_box_size[1])/view_box_size[0])))
        else:
            canvas_size = (int(1024*(float(view_box_size[0])/view_box_size[1])), 1024)

        dwg = svgwrite.Drawing(self.name+'.svg', profile='tiny', size=canvas_size , viewBox=('0 0 %d %d' % view_box_size))
        for line in self.lines:
            a = self.normalize(self.vertices[line.a])
            b = self.normalize(self.vertices[line.b])
            if line.is_one_sided():
                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(object):
    """Represents a Linedef inside a WAD"""
    def __init__(self,data):
        self.a, self.b = struct.unpack('<hh', data[0:4])
        self.left_side, self.right_side = struct.unpack('<hh', data[-4:])

    def is_one_sided(self):
        return self.left_side == -1 or self.right_side == -1

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

if __name__ == "__main__":
    import sys

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

Nice job. I did something similar a while ago in C here https://github.com/Slipyx/wadslip/. I'm amazed at how yours is significantly less code, although could be the language used. Mine also doesn't do anything other than DOOM well.

Neat job, buddy ...

Thanks Slipyx, I really can't too much credit for the brevity, Python (specifically list comprehensions and the excellent struct.unpack() is making things a lot cleaner). My longer term plan is to make something like my http://sndtst.com site but for doom/hexen/Wolf3d/Duke3d levels :)

Moved to python3 :)

Great script; I'm using it to create "Deathkings of the Dark Citadel" maps for the Doom Wiki (the Doom Wiki, not the new one).

Is anyone else having the problem that the maps created are flipped vertically? Fortunately this is just a slight annoyance, and soon fixed using Inkscape.

What is the licensing on this?

Thanks for the script Jason! I found your script and for fun converted it to a Rust project so I could understand how to read wads. I had a lot of fun reading your code.