Mercurial > touhou

annotate pytouhou/utils/lzss.pyx @ 516:577c3a88fb67

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Merge the lists Game.texts and Game.native_texts into the Game.texts dict.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sun, 11 May 2014 20:25:07 +0200
parents 1b532e7dd521
children 53fa73932e9a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
52
ab826bc29aa2 Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents: 0
diff changeset
1 # -*- encoding: utf-8 -*-
ab826bc29aa2 Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents: 0
diff changeset
2 ##
ab826bc29aa2 Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents: 0
diff changeset
3 ## Copyright (C) 2011 Thibaut Girka <thib@sitedethib.com>
ab826bc29aa2 Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents: 0
diff changeset
4 ##
ab826bc29aa2 Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents: 0
diff changeset
5 ## This program is free software; you can redistribute it and/or modify
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
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.
ab826bc29aa2 Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents: 0
diff changeset
8 ##
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,
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
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
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
490
1b532e7dd521 Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 368
diff changeset
15 cimport cython
252
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
16 from libc.stdlib cimport calloc, malloc, free
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
17
490
1b532e7dd521 Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 368
diff changeset
18 from .bitstream cimport BitStream
252
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
19
490
1b532e7dd521 Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 368
diff changeset
20
1b532e7dd521 Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 368
diff changeset
21 @cython.cdivision(True)
1b532e7dd521 Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 368
diff changeset
22 cpdef bytes decompress(BitStream bitstream,
252
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
23 Py_ssize_t size,
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
24 unsigned int dictionary_size=0x2000,
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
25 unsigned int offset_size=13,
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
26 unsigned int length_size=4,
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
27 unsigned int minimum_match_length=3):
490
1b532e7dd521 Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 368
diff changeset
28 cdef Py_ssize_t ptr, length
1b532e7dd521 Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 368
diff changeset
29 cdef unsigned int dictionary_head
368
71cd4461bb7f Minor optimizations
Thibaut Girka <thib@sitedethib.com>
parents: 367
diff changeset
30 cdef unsigned char byte
71cd4461bb7f Minor optimizations
Thibaut Girka <thib@sitedethib.com>
parents: 367
diff changeset
31 cdef char *out_data, *dictionary
252
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
32
368
71cd4461bb7f Minor optimizations
Thibaut Girka <thib@sitedethib.com>
parents: 367
diff changeset
33 out_data = <char*> malloc(size)
71cd4461bb7f Minor optimizations
Thibaut Girka <thib@sitedethib.com>
parents: 367
diff changeset
34 dictionary = <char*> calloc(dictionary_size, 1)
252
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
35 dictionary_head, ptr = 1, 0
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
36
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
37 while ptr < size:
367
2674c789e0c3 Various optimizations
Thibaut Girka <thib@sitedethib.com>
parents: 252
diff changeset
38 if bitstream.read_bit():
0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
39 # The `flag` bit is set, indicating the upcoming chunk of data is a literal
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
40 # Add it to the uncompressed file, and store it in the dictionary
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
41 byte = bitstream.read(8)
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
42 dictionary[dictionary_head] = byte
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
43 dictionary_head = (dictionary_head + 1) % dictionary_size
252
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
44 out_data[ptr] = byte
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
45 ptr += 1
0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
46 else:
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
47 # The `flag` bit is not set, the upcoming chunk is a (offset, length) tuple
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
48 offset = bitstream.read(offset_size)
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
49 length = bitstream.read(length_size) + minimum_match_length
368
71cd4461bb7f Minor optimizations
Thibaut Girka <thib@sitedethib.com>
parents: 367
diff changeset
50 if ptr + length > size:
71cd4461bb7f Minor optimizations
Thibaut Girka <thib@sitedethib.com>
parents: 367
diff changeset
51 raise Exception
252
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
52 if offset == 0 and length == 0:
0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
53 break
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
54 for i in range(offset, offset + length):
368
71cd4461bb7f Minor optimizations
Thibaut Girka <thib@sitedethib.com>
parents: 367
diff changeset
55 out_data[ptr] = dictionary[i % dictionary_size]
0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
56 dictionary[dictionary_head] = dictionary[i % dictionary_size]
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
57 dictionary_head = (dictionary_head + 1) % dictionary_size
368
71cd4461bb7f Minor optimizations
Thibaut Girka <thib@sitedethib.com>
parents: 367
diff changeset
58 ptr += 1
252
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
59
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
60 _out_data = out_data[:size]
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
61 free(out_data)
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
62 free(dictionary)
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
63 return _out_data
b5c7369abd7c Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
64