mirror of
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121 lines
3.6 KiB
Cython
121 lines
3.6 KiB
Cython
from __future__ import unicode_literals
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from libc.string cimport memcpy
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# Note that we're setting the most significant bits here first, when in practice
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# we're actually wanting the last bit to be most significant (for Huffman coding,
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# anyway).
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cdef Code bit_append(Code code, bint bit) nogil:
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cdef uint64_t one = 1
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if bit:
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code.bits |= one << code.length
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else:
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code.bits &= ~(one << code.length)
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code.length += 1
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return code
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cdef class BitArray:
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def __init__(self, data=b''):
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self.data = bytearray(data)
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self.byte = 0
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self.bit_of_byte = 0
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self.i = 0
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def __len__(self):
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return 8 * len(self.data) + self.bit_of_byte
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def __str__(self):
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cdef uchar byte, i
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cdef uchar one = 1
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string = b''
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for i in range(len(self.data)):
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byte = ord(self.data[i])
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for j in range(8):
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string += b'1' if (byte & (one << j)) else b'0'
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for i in range(self.bit_of_byte):
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string += b'1' if (byte & (one << i)) else b'0'
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return string
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def seek(self, i):
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self.i = i
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def __iter__(self):
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cdef uchar byte, i
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cdef uchar one = 1
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start_byte = self.i // 8
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start_bit = self.i % 8
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if start_bit != 0 and start_byte < len(self.data):
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byte = self.data[start_byte]
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for i in range(start_bit, 8):
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self.i += 1
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yield 1 if (byte & (one << i)) else 0
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start_byte += 1
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start_bit = 0
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for byte in self.data[start_byte:]:
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for i in range(8):
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self.i += 1
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yield 1 if byte & (one << i) else 0
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if self.bit_of_byte != 0:
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byte = self.byte
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for i in range(start_bit, self.bit_of_byte):
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self.i += 1
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yield 1 if self.byte & (one << i) else 0
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cpdef int32_t read32(self) except 0:
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cdef int start_byte = self.i // 8
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# TODO portability
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cdef uchar[4] chars
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chars[0] = self.data[start_byte]
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chars[1] = self.data[start_byte+1]
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chars[2] = self.data[start_byte+2]
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chars[3] = self.data[start_byte+3]
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cdef uint32_t output
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memcpy(&output, chars, 4)
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self.i += 32
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return output
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def as_bytes(self):
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cdef unsigned char byte_char
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if self.bit_of_byte != 0:
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byte = chr(self.byte)
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# Jump through some hoops for Python3
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if isinstance(byte, unicode):
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return self.data + <bytes>(&self.byte)[:1]
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else:
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return self.data + chr(self.byte)
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else:
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return self.data
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def append(self, bint bit):
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cdef uint64_t one = 1
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if bit:
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self.byte |= one << self.bit_of_byte
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else:
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self.byte &= ~(one << self.bit_of_byte)
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self.bit_of_byte += 1
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self.i += 1
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if self.bit_of_byte == 8:
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self.data += bytearray((self.byte,))
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self.byte = 0
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self.bit_of_byte = 0
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cdef int extend(self, uint64_t code, char n_bits) except -1:
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cdef uint64_t one = 1
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cdef unsigned char bit_of_code
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for bit_of_code in range(n_bits):
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if code & (one << bit_of_code):
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self.byte |= one << self.bit_of_byte
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else:
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self.byte &= ~(one << self.bit_of_byte)
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self.bit_of_byte += 1
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if self.bit_of_byte == 8:
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self.data += <bytes>self.byte
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self.byte = 0
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self.bit_of_byte = 0
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self.i += 1
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