Mercurial > touhou
annotate pytouhou/utils/bitstream.pyx @ 397:c5ba11ede097
Don’t duplicate values in sprite rendering data.
| author | Emmanuel Gil Peyrot <linkmauve@linkmauve.fr> |
|---|---|
| date | Wed, 06 Feb 2013 21:41:05 +0100 |
| parents | 2674c789e0c3 |
| children | efae61ad6efe |
| rev | line source |
|---|---|
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ab826bc29aa2
Add some documentation, GPLv3 headers, README and COPYING file.
Thibaut Girka <thib@sitedethib.com>
parents:
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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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Thibaut Girka <thib@sitedethib.com>
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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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15 cdef class BitStream: |
| 367 | 16 cdef public object io |
| 17 cdef unsigned int bits | |
| 18 cdef unsigned char byte | |
| 19 cdef bytes bytes | |
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20 |
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21 |
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22 def __init__(BitStream self, io): |
| 0 | 23 self.io = io |
| 24 self.bits = 0 | |
| 25 self.byte = 0 | |
| 26 | |
| 27 | |
| 97 | 28 def __enter__(self): |
| 29 return self | |
| 30 | |
| 31 | |
| 32 def __exit__(self, type, value, traceback): | |
| 33 return self.io.__exit__(type, value, traceback) | |
| 34 | |
| 35 | |
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36 def seek(BitStream self, offset, whence=0): |
| 0 | 37 self.io.seek(offset, whence) |
| 38 self.byte = 0 | |
| 39 self.bits = 0 | |
| 40 | |
| 41 | |
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42 def tell(BitStream self): |
| 0 | 43 return self.io.tell() |
| 44 | |
| 45 | |
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46 def tell2(BitStream self): |
| 0 | 47 return self.io.tell(), self.bits |
| 48 | |
| 49 | |
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50 cpdef unsigned char read_bit(BitStream self): |
| 0 | 51 if not self.bits: |
| 367 | 52 self.bytes = self.io.read(1) |
| 53 self.byte = (<unsigned char*> self.bytes)[0] | |
| 0 | 54 self.bits = 8 |
| 55 self.bits -= 1 | |
| 56 return (self.byte >> self.bits) & 0x01 | |
| 57 | |
| 58 | |
| 367 | 59 cpdef unsigned int read(BitStream self, unsigned int nb_bits): |
| 60 cdef unsigned int value = 0, read = 0 | |
| 61 cdef unsigned int nb_bits2 = nb_bits | |
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62 |
| 367 | 63 while nb_bits2: |
| 64 if not self.bits: | |
| 65 self.bytes = self.io.read(1) | |
| 66 self.byte = (<unsigned char*> self.bytes)[0] | |
| 67 self.bits = 8 | |
| 68 read = self.bits if nb_bits2 > self.bits else nb_bits2 | |
| 69 nb_bits2 -= read | |
| 70 self.bits -= read | |
| 71 value |= (self.byte >> self.bits) << nb_bits2 | |
| 72 return value & ((1 << nb_bits) - 1) | |
| 0 | 73 |
| 74 | |
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75 cpdef write_bit(BitStream self, bit): |
| 0 | 76 if self.bits == 8: |
| 77 self.io.write(chr(self.byte)) | |
| 78 self.bits = 0 | |
| 79 self.byte = 0 | |
| 80 self.byte &= ~(1 << (7 - self.bits)) | |
| 81 self.byte |= bit << (7 - self.bits) | |
| 82 self.bits += 1 | |
| 83 | |
| 84 | |
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85 def write(BitStream self, bits, nb_bits): |
| 0 | 86 for i in range(nb_bits): |
| 87 self.write_bit(bits >> (nb_bits - 1 - i) & 0x01) | |
| 88 | |
| 89 | |
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parents:
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90 def flush(BitStream self): |
| 0 | 91 self.io.write(chr(self.byte)) |
| 92 self.bits = 0 | |
| 93 self.byte = 0 | |
| 94 self.io.flush() | |
| 95 |