Mercurial > touhou
annotate pytouhou/formats/pbg3.py @ 716:5016c09e5d7c
Fix some warnings.
author | Emmanuel Gil Peyrot <linkmauve@linkmauve.fr> |
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date | Mon, 23 Sep 2019 13:49:07 +0200 |
parents | d1f0bb0b7a17 |
children | d18c0bf11138 |
rev | line source |
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1 # -*- encoding: utf-8 -*- |
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2 ## |
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3 ## Copyright (C) 2011 Thibaut Girka <thib@sitedethib.com> |
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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 """PBG3 archive files handling. |
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16 |
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17 This module provides classes for handling the PBG3 file format. |
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18 The PBG3 format is the archive format used by Touhou: EoSD. |
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19 |
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20 PBG3 files are merely a bitstream composed of a header, |
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21 a file table, and LZSS-compressed files. |
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22 """ |
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23 |
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24 from collections import namedtuple |
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25 from io import BytesIO |
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26 |
58 | 27 from pytouhou.utils.bitstream import BitStream |
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28 from pytouhou.utils import lzss |
58 | 29 |
30 from pytouhou.utils.helpers import get_logger | |
31 | |
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32 from pytouhou.formats import WrongFormatError |
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33 |
58 | 34 logger = get_logger(__name__) |
35 | |
36 | |
0 | 37 class PBG3BitStream(BitStream): |
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38 """Helper class to handle strings and integers in PBG3 bitstreams.""" |
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39 |
0 | 40 def read_int(self): |
204
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41 """Read an integer from the bitstream. |
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42 |
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43 Integers have variable sizes. They begin with a two-bit value indicating |
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44 the number of (non-aligned) bytes to read. |
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45 """ |
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46 |
0 | 47 size = self.read(2) |
48 return self.read((size + 1) * 8) | |
49 | |
50 | |
51 def read_string(self, maxsize): | |
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52 """Read a string from the bitstream. |
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53 |
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54 Strings are stored as standard NULL-termianted sequences of bytes. |
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55 The only catch is that they are not byte-aligned. |
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56 """ |
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57 |
0 | 58 string = [] |
59 for i in range(maxsize): | |
60 byte = self.read(8) | |
61 if byte == 0: | |
62 break | |
63 string.append(byte) | |
64 return ''.join(chr(byte) for byte in string) | |
65 | |
66 | |
67 | |
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68 PBG3Entry = namedtuple('PBG3Entry', 'unknown1 unknown2 checksum offset size') |
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69 |
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70 |
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71 |
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72 class PBG3: |
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73 """Handle PBG3 archive files. |
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74 |
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75 PBG3 is a file archive format used in Touhou 6: EoSD. |
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76 This class provides a representation of such files, as well as functions to |
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77 read and extract files from a PBG3 archive. |
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78 |
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79 Instance variables: |
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80 entries -- list of PBG3Entry objects describing files present in the archive |
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81 bitstream -- PBG3BitStream object |
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82 """ |
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83 |
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84 def __init__(self, entries=None, bitstream=None): |
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85 self.entries = entries or {} |
0 | 86 self.bitstream = bitstream #TODO |
87 | |
88 | |
97 | 89 def __enter__(self): |
90 return self | |
91 | |
92 | |
93 def __exit__(self, type, value, traceback): | |
94 return self.bitstream.__exit__(type, value, traceback) | |
95 | |
96 | |
0 | 97 @classmethod |
98 def read(cls, file): | |
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99 """Read a PBG3 file. |
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100 |
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101 Raise an exception if the file is invalid. |
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102 Return a PBG3 instance otherwise. |
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103 """ |
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104 |
0 | 105 magic = file.read(4) |
106 if magic != b'PBG3': | |
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107 raise WrongFormatError(magic) |
0 | 108 |
109 bitstream = PBG3BitStream(file) | |
110 entries = {} | |
111 | |
112 nb_entries = bitstream.read_int() | |
113 offset = bitstream.read_int() | |
114 bitstream.seek(offset) | |
115 for i in range(nb_entries): | |
116 unknown1 = bitstream.read_int() | |
117 unknown2 = bitstream.read_int() | |
118 checksum = bitstream.read_int() # Checksum of *compressed data* | |
119 offset = bitstream.read_int() | |
120 size = bitstream.read_int() | |
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121 name = bitstream.read_string(255) |
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122 entries[name] = PBG3Entry(unknown1, unknown2, checksum, offset, size) |
0 | 123 |
124 return PBG3(entries, bitstream) | |
125 | |
126 | |
127 def list_files(self): | |
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128 """List files present in the archive.""" |
0 | 129 return self.entries.keys() |
130 | |
131 | |
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132 def get_file(self, filename, check=False): |
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133 """Extract a given file. |
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134 |
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135 If “filename” is in the archive, extract it and return its contents. |
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136 Otherwise, raise an exception. |
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137 |
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138 By default, the checksum of the file won't be verified, |
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139 you can however force the verification using the “check” argument. |
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140 """ |
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141 |
0 | 142 unkwn1, unkwn2, checksum, offset, size = self.entries[filename] |
143 self.bitstream.seek(offset) | |
144 data = lzss.decompress(self.bitstream, size) | |
145 if check: | |
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146 # Verify the checksum |
0 | 147 compressed_size = self.bitstream.io.tell() - offset |
148 self.bitstream.seek(offset) | |
149 value = 0 | |
150 for c in self.bitstream.io.read(compressed_size): | |
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151 value += c |
0 | 152 value &= 0xFFFFFFFF |
153 if value != checksum: | |
58 | 154 logger.warn('corrupted data!') |
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155 return BytesIO(data) |