commit 94929a2fdacfe8cbb720c309b01d855d4880330e
Author: josch <j.schauer@email.de>
Date:   Tue Mar 11 17:12:36 2014 +0100

    initial commit

diff --git a/lodextract.py b/lodextract.py
new file mode 100644
index 0000000..792a6ae
--- /dev/null
+++ b/lodextract.py
@@ -0,0 +1,78 @@
+#!/usr/bin/env python
+
+import zlib
+import struct
+import os
+from PIL import Image
+
+def is_pcx(data):
+    size,width,height = struct.unpack("<III",data[:12])
+    return size == width*height or size == width*height*3
+
+def read_pcx(data):
+    size,width,height = struct.unpack("<III",data[:12])
+    if size == width*height:
+        im = Image.fromstring('P', (width,height),data[12:12+width*height])
+        palette = []
+        for i in range(256):
+            offset=12+width*height+i*3
+            r,g,b = struct.unpack("<BBB",data[offset:offset+3])
+            palette.extend((r,g,b))
+        im.putpalette(palette)
+        return im
+    elif size == width*height*3:
+        return Image.fromstring('RGB', (width,height),data[12:])
+    else:
+        return None
+
+def unpack_lod(infile,outdir):
+    f = open(infile)
+
+    if f.read(4) != 'LOD\0':
+        print "not LOD file"
+        return False
+
+    f.seek(8)
+    total, = struct.unpack("<I", f.read(4))
+    f.seek(92)
+
+    files=[]
+    for i in range(total):
+        filename, = struct.unpack("16s", f.read(16))
+        filename = filename[:filename.index('\0')]
+        offset,size,_,csize = struct.unpack("<IIII", f.read(16))
+        files.append((filename,offset,size,csize))
+
+    for filename,offset,size,csize in files:
+        filename=os.path.join(outdir,filename)
+        print filename
+        f.seek(offset)
+        if csize != 0:
+            data = zlib.decompress(f.read(csize))
+        else:
+            data = f.read(size)
+        if is_pcx(data):
+            im = read_pcx(data)
+            if im:
+                im.save(filename, "PNG")
+            else:
+                return False
+        else:
+            o = open(filename,"w+")
+            o.write(data)
+            o.close()
+
+    return True
+
+if __name__ == '__main__':
+    import sys
+    if len(sys.argv) != 3:
+        print "usage: %s infile.lod ./outdir"%sys.argv[0]
+        print ""
+        print "usually after installing the normal way:"
+        print "    %s .vcmi/Data/H3bitmap.lod .vcmi/Mods/vcmi/Data/"
+        print "    rm .vcmi/Data/H3bitmap.lod"
+        print "    %s .vcmi/Data/H3sprite.lod .vcmi/Mods/vcmi/Data/"
+        print "    rm .vcmi/Data/H3sprite.lod"
+    ret = unpack_lod(sys.argv[1], sys.argv[2])
+    exit(0 if ret else 1)