parse-brlan.py

import sys, struct, re
from ethyl import *

if len(sys.argv) != 2:
    print 'Usage: python parse-brlan.py something.brlan'
    sys.exit(1)

f = open(sys.argv[1], 'rb')
rlan = f.read()
f.close()

assert rlan[0:4] in ( 'RLAN', 'RLTP', 'RLMC', 'RLVC', 'RLPA', 'RLTS', 'RLVI')
assert rlan[4:8] == '\xfe\xff\x00\x08'
offs, nel = struct.unpack('>hh', rlan[0xc:0x10])
ch = iff_to_chunks(rlan[offs:])

assert len(ch) == nel

# Holy indirection
# rlan
#   pai1
#       timg
#       anim
#           anim body
#               aent
#                   aent body
#

for typ, chunk in ch:
    assert typ == 'pai1'
    framesize, flags, _, num_timgs, num_anims, anim_offset = struct.unpack('>hbbhhI', chunk[:0xc])
    print 'Framesize: %d\nFlags:     %x' % (framesize, flags)
    for n in xrange(num_timgs):
       pos = 0x10 + 4*n
       offs = struct.unpack('>I', chunk[pos:pos+4])
       print 'timg: %s' % nullterm(chunk[pos - 8:])
    for n in xrange(num_anims):
       pos = anim_offset - 8 + 4*n
       offs = struct.unpack('>I', chunk[pos:pos+4])[0] - 8
       
       name = chunk[offs:offs + 0x14].rstrip('\0')
       
       aunk, aoffs = struct.unpack('>II', chunk[offs + 0x14:offs + 0x1c])
       print name, hex(aoffs)
       aoffs += offs
       atyp = chunk[aoffs:aoffs+4]
       #print hex(aoffs), hex(offs), name
       
       num_aents = ord(chunk[aoffs + 4])
       print atyp, name, hex(aunk)
       
       for m in xrange(num_aents):
            boffs = aoffs + 8 + 4*m
            coffs, = struct.unpack('>I', chunk[boffs:boffs + 4])
            coffs += aoffs
            if atyp in ('RLMC', 'RLVC', 'RLPA', 'RLTP', 'RLIM', 'RLTS'): # doesn't cover RLVI
                byte0, byte1, byte2, byte3, num_cookies, pad, cookies_offs = struct.unpack('>BBBBHHI', chunk[coffs:coffs+0xc])
                #print 'cookies_offs: %x' % cookies_offs
                print hex(byte0), hex(byte1), hex(byte2), hex(byte3), num_cookies
                for o in xrange(num_cookies):
                    cookie_offs = coffs + cookies_offs + 0xc*o
                    coords = struct.unpack('>fff', chunk[cookie_offs:cookie_offs + 0xc])
                    print '   ', coords
            print '   ', '---'
            
       #print repr(name)
       #unk, anim_header_len = struct.unpack('>II', chunk[offs + 20:offs + 28])
       #atyp = chunk[offs + 28:offs + 32]