Mercurial > touhou
annotate pytouhou/formats/pbg3.py @ 123:d1c82d43bbf3
Various optimizations
| author | Thibaut Girka <thib@sitedethib.com> |
|---|---|
| date | Sat, 10 Sep 2011 11:58:24 +0200 |
| parents | ac2e5e1c2c3c |
| children | 88361534c77e |
| rev | line source |
|---|---|
|
52
ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
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1 # -*- encoding: utf-8 -*- |
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ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
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2 ## |
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ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
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3 ## Copyright (C) 2011 Thibaut Girka <thib@sitedethib.com> |
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ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
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4 ## |
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ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
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5 ## This program is free software; you can redistribute it and/or modify |
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ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
|
6 ## it under the terms of the GNU General Public License as published |
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ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
|
7 ## by the Free Software Foundation; version 3 only. |
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ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
|
8 ## |
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ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
|
9 ## This program is distributed in the hope that it will be useful, |
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ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
|
10 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
|
11 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
|
12 ## GNU General Public License for more details. |
|
ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
|
13 ## |
|
ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
0
diff
changeset
|
14 |
| 58 | 15 from pytouhou.utils.bitstream import BitStream |
| 16 import pytouhou.utils.lzss as lzss | |
| 17 | |
| 18 from pytouhou.utils.helpers import get_logger | |
| 19 | |
| 20 logger = get_logger(__name__) | |
| 21 | |
| 22 | |
| 0 | 23 class PBG3BitStream(BitStream): |
| 24 def read_int(self): | |
| 25 size = self.read(2) | |
| 26 return self.read((size + 1) * 8) | |
| 27 | |
| 28 | |
| 29 def read_string(self, maxsize): | |
| 30 string = [] | |
| 31 for i in range(maxsize): | |
| 32 byte = self.read(8) | |
| 33 if byte == 0: | |
| 34 break | |
| 35 string.append(byte) | |
| 36 return ''.join(chr(byte) for byte in string) | |
| 37 | |
| 38 | |
| 39 | |
| 40 class PBG3(object): | |
| 41 def __init__(self, entries, bitstream=None): | |
| 42 self.entries = entries | |
| 43 self.bitstream = bitstream #TODO | |
| 44 | |
| 45 | |
| 97 | 46 def __enter__(self): |
| 47 return self | |
| 48 | |
| 49 | |
| 50 def __exit__(self, type, value, traceback): | |
| 51 return self.bitstream.__exit__(type, value, traceback) | |
| 52 | |
| 53 | |
| 0 | 54 @classmethod |
| 55 def read(cls, file): | |
| 56 magic = file.read(4) | |
| 57 if magic != b'PBG3': | |
| 58 raise Exception #TODO | |
| 59 | |
| 60 bitstream = PBG3BitStream(file) | |
| 61 entries = {} | |
| 62 | |
| 63 nb_entries = bitstream.read_int() | |
| 64 offset = bitstream.read_int() | |
| 65 bitstream.seek(offset) | |
| 66 for i in range(nb_entries): | |
| 67 unknown1 = bitstream.read_int() | |
| 68 unknown2 = bitstream.read_int() | |
| 69 checksum = bitstream.read_int() # Checksum of *compressed data* | |
| 70 offset = bitstream.read_int() | |
| 71 size = bitstream.read_int() | |
| 72 name = bitstream.read_string(255).decode('ascii') | |
| 73 entries[name] = (unknown1, unknown2, checksum, offset, size) | |
| 74 | |
| 75 return PBG3(entries, bitstream) | |
| 76 | |
| 77 | |
| 78 def list_files(self): | |
| 79 return self.entries.keys() | |
| 80 | |
| 81 | |
| 82 def extract(self, filename, check=False): | |
| 83 unkwn1, unkwn2, checksum, offset, size = self.entries[filename] | |
| 84 self.bitstream.seek(offset) | |
| 85 data = lzss.decompress(self.bitstream, size) | |
| 86 if check: | |
| 87 # Checking the checksum | |
| 88 compressed_size = self.bitstream.io.tell() - offset | |
| 89 self.bitstream.seek(offset) | |
| 90 value = 0 | |
| 91 for c in self.bitstream.io.read(compressed_size): | |
| 92 value += ord(c) | |
| 93 value &= 0xFFFFFFFF | |
| 94 if value != checksum: | |
| 58 | 95 logger.warn('corrupted data!') |
| 0 | 96 return data |
| 97 |