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annotate pytouhou/formats/msg.py @ 133:2cad2e84a49e

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Add reading support for the MSG format.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sun, 11 Sep 2011 07:34:34 -0700
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children d3005ebe797a
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133
2cad2e84a49e Add reading support for the MSG format.
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1 # -*- encoding: utf-8 -*-
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2 ##
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3 ## Copyright (C) 2011 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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4 ##
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5 ## This program is free software; you can redistribute it and/or modify
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6 ## it under the terms of the GNU General Public License as published
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7 ## by the Free Software Foundation; version 3 only.
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8 ##
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9 ## This program is distributed in the hope that it will be useful,
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10 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 ## GNU General Public License for more details.
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13 ##
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14
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15 import struct
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16 from struct import pack, unpack, calcsize
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17 from pytouhou.utils.helpers import read_string
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18
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19 from pytouhou.utils.helpers import get_logger
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20
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21 logger = get_logger(__name__)
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22
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23 class MSG(object):
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24 _instructions = {0: ('', None),
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25 1: ('hh', None),
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26 2: ('hh', 'change_face'),
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27 3: ('hhs', 'display_dialog_line'),
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28 4: ('I', 'pause'),
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29 5: ('hh', 'switch'),
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30 6: ('', 'add_enemy_sprite'),
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31 7: ('I', 'change_music'),
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32 8: ('hhs', 'display_character_line'),
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33 9: ('I', None),
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34 10: ('', None),
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35 11: ('', 'next_level'),
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36 12: ('', None),
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37 13: ('I', None),
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38 14: ('', None)} #TODO
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39
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40
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41 def __init__(self):
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42 self.msgs = [[]]
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43
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44
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45 @classmethod
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46 def read(cls, file):
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47 entry_count, = unpack('<I', file.read(4))
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48 entry_offsets = unpack('<%dI' % entry_count, file.read(4 * entry_count))
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49
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50 msg = cls()
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51 msg.msgs = []
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52
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53 new_entry = True
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54 while True:
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55 offset = file.tell()
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56
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57 try:
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58 time, opcode, size = unpack('<HBB', file.read(4))
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59 except:
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60 return
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61
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62 if time == 0 and opcode == 0:
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63 new_entry = True
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64
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65 if new_entry and opcode != 0:
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66 new_entry = False
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67 time = -1
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68 if offset in entry_offsets:
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69 #print(entry_offsets.index(offset))
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70 msg.msgs.append([])
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71
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72 data = file.read(size)
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73
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74 if opcode in cls._instructions:
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75 fmt = '<%s' % cls._instructions[opcode][0]
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76 if fmt.endswith('s'):
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77 fmt = fmt[:-1]
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78 fmt = '%s%ds' % (fmt, size - calcsize(fmt))
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79 args = unpack(fmt, data)
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80 if fmt.endswith('s'):
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81 args = args[:-1] + (args[-1].decode('shift_jis'),)
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82 else:
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83 args = (data, )
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84 logger.warn('unknown msg opcode %d', opcode)
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85
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86 msg.msgs[-1].append((time, opcode, args))
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87
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88
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89 return msg
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90