Mercurial > touhou

annotate pytouhou/utils/bitstream.pyx @ 246:cb329dca4758

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Use the correct behaviour for flag 1 in bullet.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Sun, 15 Jan 2012 15:22:26 +0100
parents fab7ad2f0d8b
children b5c7369abd7c
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
131
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
15 cdef class BitStream:
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
16 cdef public io
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
17 cdef public int bits
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
18 cdef public int byte
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
19
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
20 def __init__(BitStream self, io):
0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
21 self.io = io
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
22 self.bits = 0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
23 self.byte = 0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
24
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
25
97
ac2e5e1c2c3c Refactor \o/
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
26 def __enter__(self):
ac2e5e1c2c3c Refactor \o/
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
27 return self
ac2e5e1c2c3c Refactor \o/
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
28
ac2e5e1c2c3c Refactor \o/
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
29
ac2e5e1c2c3c Refactor \o/
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
30 def __exit__(self, type, value, traceback):
ac2e5e1c2c3c Refactor \o/
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
31 return self.io.__exit__(type, value, traceback)
ac2e5e1c2c3c Refactor \o/
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
32
ac2e5e1c2c3c Refactor \o/
Thibaut Girka <thib@sitedethib.com>
parents: 52
diff changeset
33
131
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
34 def seek(BitStream self, offset, whence=0):
0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
35 self.io.seek(offset, whence)
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
36 self.byte = 0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
37 self.bits = 0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
38
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
39
131
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
40 def tell(BitStream self):
0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
41 return self.io.tell()
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
42
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
43
131
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
44 def tell2(BitStream self):
0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
45 return self.io.tell(), self.bits
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
46
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
47
131
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
48 cpdef unsigned char read_bit(BitStream self):
0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
49 if not self.bits:
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
50 self.byte = ord(self.io.read(1))
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
51 self.bits = 8
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
52 self.bits -= 1
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
53 return (self.byte >> self.bits) & 0x01
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
54
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
55
131
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
56 def read(BitStream self, nb_bits):
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
57 cdef unsigned int value
0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
58 value = 0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
59 for i in range(nb_bits - 1, -1, -1):
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
60 value |= self.read_bit() << i
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
61 return value
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
62
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
63
131
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
64 cpdef write_bit(BitStream self, bit):
0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
65 if self.bits == 8:
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
66 self.io.write(chr(self.byte))
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
67 self.bits = 0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
68 self.byte = 0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
69 self.byte &= ~(1 << (7 - self.bits))
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
70 self.byte |= bit << (7 - self.bits)
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
71 self.bits += 1
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
72
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
73
131
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
74 def write(BitStream self, bits, nb_bits):
0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
75 for i in range(nb_bits):
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
76 self.write_bit(bits >> (nb_bits - 1 - i) & 0x01)
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
77
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
78
131
fab7ad2f0d8b Use Cython, improve performances!
Thibaut Girka <thib@sitedethib.com>
parents: 97
diff changeset
79 def flush(BitStream self):
0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
80 self.io.write(chr(self.byte))
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
81 self.bits = 0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
82 self.byte = 0
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
83 self.io.flush()
6b2c7af2384c Hello Gensokyo _o/
Thibaut Girka <thib@sitedethib.com>
parents:
diff changeset
84