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66 lines
1.7 KiB
66 lines
1.7 KiB
# See the file "COPYING" for information about the copyright
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# and warranty status of this software.
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import sys
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class Log(object):
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'''Logging base class'''
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VERBOSE = True
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def diagnostic_name(self):
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return self.__class__.__name__
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def log(self, *msgs):
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if Log.VERBOSE:
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print('[{}]: '.format(self.diagnostic_name()), *msgs,
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file=sys.stdout, flush=True)
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def log_error(self, *msg):
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print('[{}]: ERROR: {}'.format(self.diagnostic_name()), *msgs,
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file=sys.stderr, flush=True)
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# Method decorator. To be used for calculations that will always
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# deliver the same result. The method cannot take any arguments
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# and should be accessed as an attribute.
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class cachedproperty(object):
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def __init__(self, f):
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self.f = f
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def __get__(self, obj, type):
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if obj is None:
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return self
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value = self.f(obj)
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obj.__dict__[self.f.__name__] = value
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return value
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def __set__(self, obj, value):
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raise AttributeError('cannot set {} on {}'
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.format(self.f.__name__, obj))
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def chunks(items, size):
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for i in range(0, len(items), size):
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yield items[i: i + size]
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def bytes_to_int(be_bytes):
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'''Interprets a big-endian sequence of bytes as an integer'''
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assert isinstance(be_bytes, (bytes, bytearray))
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value = 0
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for byte in be_bytes:
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value = value * 256 + byte
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return value
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def int_to_bytes(value):
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'''Converts an integer to a big-endian sequence of bytes'''
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mods = []
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while value:
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value, mod = divmod(value, 256)
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mods.append(mod)
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return bytes(reversed(mods))
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