コード例 #1
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ファイル: elias.py プロジェクト: pombredanne/search
def delta_decode(binary_string):
    length, encoded_bits = unary.decode(binary_string)
    limit_offset = (length + 1) + length # encoding of the value itself, then 'value' number of bits to read
    first_part, next_part = binary_string[:limit_offset], binary_string[limit_offset:] # we can now extract the first encoded binary

    bits_to_decode = getvaluefrombinarystring(first_part) - 1
    value = (1 << bits_to_decode) + getvaluefrombinarystring(next_part[:bits_to_decode])

    consumed_bits = (length + 1) + length + bits_to_decode
    return value, consumed_bits
コード例 #2
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def delta_decode(binary_string):
    length, encoded_bits = unary.decode(binary_string)
    limit_offset = (length + 1) + length # encoding of the value itself, then 'value' number of bits to read
    first_part, next_part = binary_string[:limit_offset], binary_string[limit_offset:] # we can now extract the first encoded binary

    bits_to_decode = getvaluefrombinarystring(first_part) - 1
    value = (1 << bits_to_decode) + getvaluefrombinarystring(next_part[:bits_to_decode])

    consumed_bits = (length + 1) + length + bits_to_decode
    return value, consumed_bits
コード例 #3
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ファイル: elias.py プロジェクト: pombredanne/search
def gamma_decode(binary_string):
    """reads a gamma encoded value from the binary string, return the value and the number of consumed bits"""
#    assert binary_string[0] == "0"
    length, encoded_bits = unary.decode(binary_string)
    offset = length + 1
    remaining_bits = binary_string[offset: offset + length]

    read_value = (1 << length ) + getvaluefrombinarystring(remaining_bits)

    consumed_bits = length * 2 + 1
    return read_value, consumed_bits
コード例 #4
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def gamma_decode(binary_string):
    """reads a gamma encoded value from the binary string, return the value and the number of consumed bits"""
    #    assert binary_string[0] == "0"
    length, encoded_bits = unary.decode(binary_string)
    offset = length + 1
    remaining_bits = binary_string[offset:offset + length]

    read_value = (1 << length) + getvaluefrombinarystring(remaining_bits)

    consumed_bits = length * 2 + 1
    return read_value, consumed_bits
コード例 #5
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#Kabopan - Readable Algorithms. Public Domain, 2007-2009

from kbp.univ.unary import encode, decode

assert encode(0) == "1"
assert encode(1) == "01"
assert encode(5) == "000001"
assert encode(5, False) == "111110"

assert decode("1") == (0, 1)
assert decode("000001") == (5, 6)