Mercurial > touhou

annotate pytouhou/formats/t6rp.py @ 305:5492472963b0

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Minor cleanup
author Thibaut Girka <thib@sitedethib.com>
date Tue, 13 Mar 2012 18:45:43 +0100
parents 88361534c77e
children 56523a16db1d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
187
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
1 # -*- encoding: utf-8 -*-
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
2 ##
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
3 ## Copyright (C) 2011 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
4 ##
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
5 ## This program is free software; you can redistribute it and/or modify
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
6 ## it under the terms of the GNU General Public License as published
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
7 ## by the Free Software Foundation; version 3 only.
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
8 ##
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
9 ## This program is distributed in the hope that it will be useful,
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
10 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
11 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
12 ## GNU General Public License for more details.
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
13 ##
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
14
204
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
15 """Touhou 6 Replay (T6RP) files handling.
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
16
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
17 This module provides classes for handling the Touhou 6 Replay file format.
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
18 The T6RP file format is an encrypted format describing different aspects of
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
19 a game of EoSD. Since the EoSD engine is entirely deterministic, a small
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
20 replay file is sufficient to unfold a full game.
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
21 """
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
22
187
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
23 from struct import unpack
188
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
24 from io import BytesIO
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
25
305
5492472963b0 Minor cleanup
Thibaut Girka <thib@sitedethib.com>
parents: 204
diff changeset
26 from pytouhou.utils.helpers import read_string, get_logger
187
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
27
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
28 logger = get_logger(__name__)
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
29
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
30
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
31 class Level(object):
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
32 def __init__(self):
188
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
33 self.score = 0
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
34 self.random_seed = 0
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
35
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
36 self.power = 0
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
37 self.lives = 2
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
38 self.bombs = 3
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
39 self.difficulty = 16
187
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
40 self.keys = []
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
41
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
42
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
43 class T6RP(object):
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
44 def __init__(self):
188
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
45 self.version = 0x102
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
46 self.character = 0
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
47 self.rank = 0
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
48 self.key = 0
189
ba3297ab3bde Fix handling for replay files not beginning with stage 1
Thibaut Girka <thib@sitedethib.com>
parents: 188
diff changeset
49 self.levels = [None] * 7
187
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
50
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
51
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
52 @classmethod
188
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
53 def read(cls, file, decrypt=True, verify=True):
204
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
54 """Read a T6RP file.
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
55
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
56 Raise an exception if the file is invalid.
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
57 Return a T6RP instance otherwise.
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
58
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
59 Keyword arguments:
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
60 decrypt -- whether or not to decrypt the file (default True)
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
61 verify -- whether or not to verify the file's checksum (default True)
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
62 """
88361534c77e Add some documentation (argh, so much left to document!)
Thibaut Girka <thib@sitedethib.com>
parents: 193
diff changeset
63
187
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
64 if file.read(4) != b'T6RP':
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
65 raise Exception
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
66
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
67 replay = cls()
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
68
188
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
69 replay.version, replay.character, replay.rank = unpack('<HBB', file.read(4))
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
70 checksum, replay.unknown1, replay.unknown2, replay.key = unpack('<IBBB', file.read(7))
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
71
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
72 # Decrypt data
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
73 if decrypt:
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
74 decrypted_file = BytesIO()
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
75 file.seek(0)
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
76 decrypted_file.write(file.read(15))
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
77 decrypted_file.write(b''.join(chr((ord(c) - replay.key - 7*i) & 0xff) for i, c in enumerate(file.read())))
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
78 file = decrypted_file
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
79 file.seek(15)
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
80
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
81 # Verify checksum
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
82 if verify:
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
83 data = file.read()
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
84 file.seek(15)
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
85 if checksum != (sum(ord(c) for c in data) + 0x3f000318 + replay.key) & 0xffffffff:
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
86 raise Exception #TODO
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
87
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
88 replay.unknown3 = unpack('<B', file.read(1))
193
9f58e2a6e950 Fix particles, fix "random" item popping, change update order to match the original game's more closely.
Thibaut Girka <thib@sitedethib.com>
parents: 189
diff changeset
89 replay.date = file.read(9) #read_string(file, 9, 'ascii')
9f58e2a6e950 Fix particles, fix "random" item popping, change update order to match the original game's more closely.
Thibaut Girka <thib@sitedethib.com>
parents: 189
diff changeset
90 replay.name = file.read(9) #read_string(file, 9, 'ascii').rstrip()
188
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
91 replay.unknown4, replay.score, replay.unknown5, replay.slowdown, replay.unknown6 = unpack('<HIIfI', file.read(18))
187
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
92
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
93 stages_offsets = unpack('<7I', file.read(28))
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
94
189
ba3297ab3bde Fix handling for replay files not beginning with stage 1
Thibaut Girka <thib@sitedethib.com>
parents: 188
diff changeset
95 for i, offset in enumerate(stages_offsets):
187
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
96 if offset == 0:
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
97 continue
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
98
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
99 level = Level()
189
ba3297ab3bde Fix handling for replay files not beginning with stage 1
Thibaut Girka <thib@sitedethib.com>
parents: 188
diff changeset
100 replay.levels[i] = level
187
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
101
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
102 file.seek(offset)
188
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
103 (level.score, level.random_seed, level.unknown1, level.power,
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
104 level.lives, level.bombs, level.difficulty, level.unknown2) = unpack('<IHHBbbBI', file.read(16))
187
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
105
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
106 while True:
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
107 time, keys, unknown = unpack('<IHH', file.read(8))
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
108
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
109 if time == 9999999:
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
110 break
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
111
188
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
112 level.keys.append((time, keys, unknown))
187
46793ccfedca Implement replays.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
113
188
008f90ebfdc0 Fix replay handling and add support for encrypted replays
Thibaut Girka <thib@sitedethib.com>
parents: 187
diff changeset
114 return replay