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annotate pytouhou/formats/t6rp.py @ 377:70e2ed71b09c

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Add meaningful exceptions in format parsing.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Wed, 29 Aug 2012 18:34:28 +0200
parents 6a63fd3deb76
children d8aab27a2ab2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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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 def iter_keystates(self):
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47 counter = 0
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48 previous = 0
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49 for frame, keystate, unknown in self.keys:
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50 while frame >= counter:
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51 yield previous
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52 counter += 1
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53 previous = keystate
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54
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55
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56
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57 class T6RP(object):
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58 def __init__(self):
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59 self.version = 0x102
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60 self.character = 0
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61 self.rank = 0
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62 self.unknown1 = 0
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63 self.unknown2 = 0
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64 self.key = 0
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65 self.unknown3 = 0
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66 self.date = strftime('%d/%m/%y')
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67 self.name = 'PyTouhou'
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68 self.unknown4 = 0
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69 self.score = 0
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70 self.unknown5 = 0
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71 self.slowdown = 0.
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72 self.unknown6 = 0
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73 self.levels = [None] * 7
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74
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75
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76 @classmethod
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77 def read(cls, file, decrypt=True, verify=True):
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78 """Read a T6RP file.
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79
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80 Raise an exception if the file is invalid.
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81 Return a T6RP instance otherwise.
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82
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83 Keyword arguments:
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84 decrypt -- whether or not to decrypt the file (default True)
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85 verify -- whether or not to verify the file's checksum (default True)
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86 """
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87
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88 magic = file.read(4)
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89 assert magic == b'T6RP'
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90
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91 replay = cls()
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92
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93 replay.version, replay.character, replay.rank = unpack('<HBB', file.read(4))
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94 checksum, replay.unknown1, replay.unknown2, replay.key = unpack('<IBBB', file.read(7))
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95
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96 # Decrypt data
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97 if decrypt:
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98 decrypted_file = BytesIO()
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99 file.seek(0)
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100 decrypted_file.write(file.read(15))
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101 decrypted_file.write(b''.join(chr((ord(c) - replay.key - 7*i) & 0xff) for i, c in enumerate(file.read())))
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102 file = decrypted_file
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103 file.seek(15)
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104
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105 # Verify checksum
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106 if verify:
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107 data = file.read()
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108 file.seek(15)
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109 real_sum = (sum(ord(c) for c in data) + 0x3f000318 + replay.key) & 0xffffffff
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110 if checksum != real_sum:
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111 raise ChecksumError(checksum, real_sum)
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112
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113 replay.unknown3, = unpack('<B', file.read(1))
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114 replay.date = file.read(9) #read_string(file, 9, 'ascii')
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115 replay.name = file.read(9) #read_string(file, 9, 'ascii').rstrip()
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116 replay.unknown4, replay.score, replay.unknown5, replay.slowdown, replay.unknown6 = unpack('<HIIfI', file.read(18))
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117
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118 stages_offsets = unpack('<7I', file.read(28))
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119
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120 for i, offset in enumerate(stages_offsets):
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121 if offset == 0:
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122 continue
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123
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124 level = Level()
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125 replay.levels[i] = level
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126
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127 file.seek(offset)
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128 (level.score, level.random_seed, level.point_items, level.power,
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129 level.lives, level.bombs, level.difficulty, level.unknown) = unpack('<IHHBbbBI', file.read(16))
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130
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131 while True:
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132 time, keys, unknown = unpack('<IHH', file.read(8))
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133
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134 if time == 9999999:
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135 break
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136
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137 level.keys.append((time, keys, unknown))
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138
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139 return replay
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140
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141
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142 def write(self, file, encrypt=True):
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143 if encrypt:
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144 encrypted_file = file
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145 file = BytesIO()
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146
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147 file.write(b'T6RP')
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148 file.write(pack('<HBB', self.version, self.character, self.rank))
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149
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150 checksum_offset = file.tell()
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151 file.seek(4, 1) # For checksum
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152 file.write(pack('<BBB', self.unknown1, self.unknown2, self.key))
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153
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154 file.write(pack('<B', self.unknown3))
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155
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156 #TODO: find a more elegant method.
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157 n = 9 - len(self.date)
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158 file.write(self.date)
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159 file.write('\0' * n)
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160 n = 9 - len(self.name)
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161 file.write(self.name)
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162 file.write('\0' * n)
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163
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164 file.write(pack('<HIIfI', self.unknown4, self.score, self.unknown5, self.slowdown, self.unknown6))
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165
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166 stages_offsets_offset = file.tell()
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167 file.seek(7*4, 1) # Skip the stages offsets.
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168
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169 stages_offsets = []
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170 for level in self.levels:
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171 if not level:
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172 stages_offsets.append(0)
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173 continue
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174
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175 stages_offsets.append(file.tell())
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176 file.write(pack('<IHHBbbBI', level.score, level.random_seed,
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177 level.point_items, level.power, level.lives,
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178 level.bombs, level.difficulty, level.unknown))
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179
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180 for time, keys, unknown in level.keys:
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181 file.write(pack('<IHH', time, keys, unknown))
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182
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183 file.write(pack('<IHH', 9999999, 0, 0))
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184
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185 file.seek(stages_offsets_offset)
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186 file.write(pack('<7I', *stages_offsets))
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187
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188 # Write checksum
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189 file.seek(15)
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190 data = file.read()
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191 checksum = (sum(ord(c) for c in data) + 0x3f000318 + self.key) & 0xffffffff
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192 file.seek(checksum_offset)
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193 file.write(pack('<I', checksum))
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194
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195 # Encrypt
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196 if encrypt:
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197 file.seek(0)
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198 encrypted_file.write(file.read(15))
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199 encrypted_file.write(b''.join(chr((ord(c) + self.key + 7*i) & 0xff) for i, c in enumerate(file.read())))
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200