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annotate pytouhou/formats/t6rp.py @ 373:6deab6ad8be8

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Add the ability to save a replay.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sun, 05 Aug 2012 16:37:26 +0200
parents 56523a16db1d
children 6a63fd3deb76
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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
204
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15 """Touhou 6 Replay (T6RP) files handling.
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16
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17 This module provides classes for handling the Touhou 6 Replay file format.
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18 The T6RP file format is an encrypted format describing different aspects of
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19 a game of EoSD. Since the EoSD engine is entirely deterministic, a small
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20 replay file is sufficient to unfold a full game.
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21 """
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22
373
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23 from struct import unpack, pack
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24 from io import BytesIO
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25 from time import strftime
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26
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27 from pytouhou.utils.helpers import read_string, get_logger
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28
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29 logger = get_logger(__name__)
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30
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31
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32 class Level(object):
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33 def __init__(self):
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34 self.score = 0
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35 self.random_seed = 0
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36 self.point_items = 0
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37
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38 self.power = 0
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39 self.lives = 2
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40 self.bombs = 3
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41 self.difficulty = 16
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42 self.unknown = 0
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43 self.keys = []
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44
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45
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46 class T6RP(object):
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47 def __init__(self):
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48 self.version = 0x102
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49 self.character = 0
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50 self.rank = 0
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51 self.unknown1 = 0
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52 self.unknown2 = 0
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53 self.key = 0
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54 self.unknown3 = 0
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55 self.date = strftime('%d/%m/%y')
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56 self.name = 'PyTouhou'
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57 self.unknown4 = 0
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58 self.score = 0
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59 self.unknown5 = 0
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60 self.slowdown = 0.
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61 self.unknown6 = 0
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62 self.levels = [None] * 7
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63
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64
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65 @classmethod
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66 def read(cls, file, decrypt=True, verify=True):
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67 """Read a T6RP file.
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68
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69 Raise an exception if the file is invalid.
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70 Return a T6RP instance otherwise.
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71
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72 Keyword arguments:
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73 decrypt -- whether or not to decrypt the file (default True)
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74 verify -- whether or not to verify the file's checksum (default True)
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75 """
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76
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77 if file.read(4) != b'T6RP':
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78 raise Exception
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79
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80 replay = cls()
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81
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82 replay.version, replay.character, replay.rank = unpack('<HBB', file.read(4))
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83 checksum, replay.unknown1, replay.unknown2, replay.key = unpack('<IBBB', file.read(7))
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84
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85 # Decrypt data
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86 if decrypt:
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87 decrypted_file = BytesIO()
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88 file.seek(0)
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89 decrypted_file.write(file.read(15))
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90 decrypted_file.write(b''.join(chr((ord(c) - replay.key - 7*i) & 0xff) for i, c in enumerate(file.read())))
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91 file = decrypted_file
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92 file.seek(15)
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93
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94 # Verify checksum
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95 if verify:
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96 data = file.read()
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97 file.seek(15)
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98 real_sum = (sum(ord(c) for c in data) + 0x3f000318 + replay.key) & 0xffffffff
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99 if checksum != real_sum:
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100 raise Exception('Checksum mismatch: %d ≠ %d.' % (checksum, real_sum))
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101
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102 replay.unknown3, = unpack('<B', file.read(1))
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103 replay.date = file.read(9) #read_string(file, 9, 'ascii')
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104 replay.name = file.read(9) #read_string(file, 9, 'ascii').rstrip()
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105 replay.unknown4, replay.score, replay.unknown5, replay.slowdown, replay.unknown6 = unpack('<HIIfI', file.read(18))
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106
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107 stages_offsets = unpack('<7I', file.read(28))
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108
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109 for i, offset in enumerate(stages_offsets):
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110 if offset == 0:
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111 continue
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112
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113 level = Level()
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114 replay.levels[i] = level
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115
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116 file.seek(offset)
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117 (level.score, level.random_seed, level.point_items, level.power,
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118 level.lives, level.bombs, level.difficulty, level.unknown) = unpack('<IHHBbbBI', file.read(16))
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119
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120 while True:
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121 time, keys, unknown = unpack('<IHH', file.read(8))
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122
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123 if time == 9999999:
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124 break
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125
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126 level.keys.append((time, keys, unknown))
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127
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128 return replay
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129
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130
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131 def write(self, file, encrypt=True):
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132 if encrypt:
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133 encrypted_file = file
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134 file = BytesIO()
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135
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136 file.write(b'T6RP')
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137 file.write(pack('<HBB', self.version, self.character, self.rank))
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138
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139 checksum_offset = file.tell()
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140 file.seek(4, 1) # For checksum
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141 file.write(pack('<BBB', self.unknown1, self.unknown2, self.key))
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142
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143 file.write(pack('<B', self.unknown3))
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144
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145 #TODO: find a more elegant method.
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146 n = 9 - len(self.date)
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147 file.write(self.date)
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148 file.write('\0' * n)
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149 n = 9 - len(self.name)
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150 file.write(self.name)
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151 file.write('\0' * n)
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152
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153 file.write(pack('<HIIfI', self.unknown4, self.score, self.unknown5, self.slowdown, self.unknown6))
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154
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155 stages_offsets_offset = file.tell()
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156 file.seek(7*4, 1) # Skip the stages offsets.
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157
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158 stages_offsets = []
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159 for level in self.levels:
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160 if not level:
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161 stages_offsets.append(0)
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162 continue
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163
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164 stages_offsets.append(file.tell())
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165 file.write(pack('<IHHBbbBI', level.score, level.random_seed,
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166 level.point_items, level.power, level.lives,
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167 level.bombs, level.difficulty, level.unknown))
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168
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169 for time, keys, unknown in level.keys:
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170 file.write(pack('<IHH', time, keys, unknown))
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171
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172 file.write(pack('<IHH', 9999999, 0, 0))
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173
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174 file.seek(stages_offsets_offset)
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175 file.write(pack('<7I', *stages_offsets))
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176
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177 # Write checksum
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178 file.seek(15)
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179 data = file.read()
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180 checksum = (sum(ord(c) for c in data) + 0x3f000318 + self.key) & 0xffffffff
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181 file.seek(checksum_offset)
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182 file.write(pack('<I', checksum))
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183
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184 # Encrypt
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185 if encrypt:
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186 file.seek(0)
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187 encrypted_file.write(file.read(15))
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188 encrypted_file.write(b''.join(chr((ord(c) + self.key + 7*i) & 0xff) for i, c in enumerate(file.read())))
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189