Mercurial > touhou
annotate pytouhou/utils/bitstream.pyx @ 654:ec7e888e88f3
Up to instruction 34 validated.
| author | Gauvain "GovanifY" Roussel-Tarbouriech <gauvain@govanify.com> |
|---|---|
| date | Thu, 08 Aug 2019 16:42:25 +0200 |
| parents | 3c2f96f1d715 |
| children |
| rev | line source |
|---|---|
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52
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Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
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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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Thibaut Girka <thib@sitedethib.com>
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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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131
fab7ad2f0d8b
Use Cython, improve performances!
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15 cdef class BitStream: |
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417
efae61ad6efe
Remove the type of the self argument in extension types, as it clutters the code with useless information.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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16 def __init__(self, io): |
| 0 | 17 self.io = io |
| 18 self.bits = 0 | |
| 19 self.byte = 0 | |
| 20 | |
| 21 | |
| 97 | 22 def __enter__(self): |
| 23 return self | |
| 24 | |
| 25 | |
| 26 def __exit__(self, type, value, traceback): | |
| 27 return self.io.__exit__(type, value, traceback) | |
| 28 | |
| 29 | |
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417
efae61ad6efe
Remove the type of the self argument in extension types, as it clutters the code with useless information.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
367
diff
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30 def seek(self, offset, whence=0): |
| 0 | 31 self.io.seek(offset, whence) |
| 32 self.byte = 0 | |
| 33 self.bits = 0 | |
| 34 | |
| 35 | |
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606
3c2f96f1d715
Fix compilation under Cython 0.22, by making the pyx and the pxd declarations’ except clause similar.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
490
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36 cdef bint read_bit(self) except -1: |
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490
1b532e7dd521
Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
468
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37 cdef bytes byte |
| 0 | 38 if not self.bits: |
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490
1b532e7dd521
Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
468
diff
changeset
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39 byte = self.io.read(1) |
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1b532e7dd521
Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
468
diff
changeset
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40 self.byte = (<unsigned char*>byte)[0] |
| 0 | 41 self.bits = 8 |
| 42 self.bits -= 1 | |
| 43 return (self.byte >> self.bits) & 0x01 | |
| 44 | |
| 45 | |
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606
3c2f96f1d715
Fix compilation under Cython 0.22, by making the pyx and the pxd declarations’ except clause similar.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
490
diff
changeset
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46 cpdef unsigned int read(self, unsigned int nb_bits) except? 4242: |
| 367 | 47 cdef unsigned int value = 0, read = 0 |
| 48 cdef unsigned int nb_bits2 = nb_bits | |
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490
1b532e7dd521
Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
468
diff
changeset
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49 cdef bytes byte |
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252
b5c7369abd7c
Improve data reading perfs
Thibaut Girka <thib@sitedethib.com>
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diff
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50 |
| 367 | 51 while nb_bits2: |
| 52 if not self.bits: | |
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490
1b532e7dd521
Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
468
diff
changeset
|
53 byte = self.io.read(1) |
|
1b532e7dd521
Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
468
diff
changeset
|
54 self.byte = (<unsigned char*>byte)[0] |
| 367 | 55 self.bits = 8 |
| 56 read = self.bits if nb_bits2 > self.bits else nb_bits2 | |
| 57 nb_bits2 -= read | |
| 58 self.bits -= read | |
| 59 value |= (self.byte >> self.bits) << nb_bits2 | |
| 60 return value & ((1 << nb_bits) - 1) | |
| 0 | 61 |
| 62 | |
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490
1b532e7dd521
Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
468
diff
changeset
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63 cpdef write_bit(self, bint bit): |
| 0 | 64 if self.bits == 8: |
| 65 self.io.write(chr(self.byte)) | |
| 66 self.bits = 0 | |
| 67 self.byte = 0 | |
| 68 self.byte &= ~(1 << (7 - self.bits)) | |
| 69 self.byte |= bit << (7 - self.bits) | |
| 70 self.bits += 1 | |
| 71 | |
| 72 | |
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490
1b532e7dd521
Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
468
diff
changeset
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73 cpdef write(self, unsigned int bits, unsigned int nb_bits): |
| 0 | 74 for i in range(nb_bits): |
| 75 self.write_bit(bits >> (nb_bits - 1 - i) & 0x01) | |
| 76 | |
| 77 | |
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490
1b532e7dd521
Decrease PBG3 loading time by improving lzss and bitstream integration.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
468
diff
changeset
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78 cpdef flush(self): |
| 0 | 79 self.io.write(chr(self.byte)) |
| 80 self.bits = 0 | |
| 81 self.byte = 0 | |
| 82 self.io.flush() | |
| 83 |