size converter done
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brent s
parent
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from . import block
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from . import filesystem
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from . import luks
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from . import lvm
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from . import mdadm
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from . import locales
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from . import users
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178
aif/utils.py
178
aif/utils.py
@ -1,3 +1,5 @@
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import re
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def xmlBool(xmlobj):
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# https://bugs.launchpad.net/lxml/+bug/1850221
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if isinstance(xmlobj, bool):
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@ -9,66 +11,164 @@ def xmlBool(xmlobj):
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else:
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return(None)
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class _Sizer(object):
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def __init__(self):
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def _getKeys(d, keylist = None):
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def collapseKeys(d, keylist = None):
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if not keylist:
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keylist = []
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for k, v in d.items():
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if isinstance(v, dict):
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keylist.append(k)
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keylist = _getKeys(v, keylist = keylist)
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keylist = collapseKeys(v, keylist = keylist)
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else:
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keylist.append(k)
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return (keylist)
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return(keylist)
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def collapseValues(d, vallist = None):
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if not vallist:
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vallist = []
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for k, v in d.items():
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if isinstance(v, dict):
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vallist = collapseValues(v, vallist = vallist)
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else:
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vallist.append(v)
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return(vallist)
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class _Sizer(object):
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def __init__(self):
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# We use different methods for converting between storage and BW, and different multipliers for each subtype.
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# https://stackoverflow.com/questions/5194057/better-way-to-convert-file-sizes-in-python
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# https://en.wikipedia.org/wiki/Orders_of_magnitude_(data)
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# https://en.wikipedia.org/wiki/Binary_prefix
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self.storageUnits = {'decimal': {'B': 0,
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'kB': 7, # Kilobyte
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'MB': 17, # Megabyte...
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'GB': 27,
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'TB': 37},
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'binary': {'KiB': 10, # Kibibyte
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'MiB': 20, # Mebibyte...
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'GiB': 30,
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'TiB': 40}}
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# https://en.wikipedia.org/wiki/Bit#Multiple_bits
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self.bwUnits = {'b': None,
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'bit': None,
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'k': }
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self.valid_storage = list(self.storageUnits.keys())
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self.valid_storage.insert('nibble')
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self.valid_bw = _getKeys(self.bwUnits)
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# 'decimal' is base-10, 'binary' is base-2. (Duh.)
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# "b" = bytes, "n" = given value, and "u" = unit suffix's key in below notes.
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self.storageUnits = {'decimal': { # n * (10 ** u) = b; b / (10 ** u) = u
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0: (None, 'B', 'byte'),
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3: ('k', 'kB', 'kilobyte'),
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6: ('M', 'MB', 'megabyte'),
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9: ('G', 'GB', 'gigabyte'),
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12: ('T', 'TB', 'teraybte'),
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13: ('P', 'PB', 'petabyte'), # yeah, right.
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15: ('E', 'EB', 'exabyte'),
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18: ('Z', 'ZB', 'zettabyte'),
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19: ('Y', 'YB', 'yottabyte')
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},
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'binary': { # n * (2 ** u) = b; b / (2 ** u) = u
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-1: ('nybble', 'nibble', 'nyble', 'half-byte', 'tetrade', 'nibble'),
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10: ('Ki', 'KiB', 'kibibyte'),
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20: ('Mi', 'MiB', 'mebibyte'),
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30: ('Gi', 'GiB', 'gibibyte'),
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40: ('Ti', 'TiB', 'tebibyte'),
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50: ('Pi', 'PiB', 'pebibyte'),
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60: ('Ei', 'EiB', 'exbibyte'),
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70: ('Zi', 'ZiB', 'zebibyte'),
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80: ('Yi', 'YiB', 'yobibyte')
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}}
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# https://en.wikipedia.org/wiki/Bit#Multiple_bits - note that 8 bits = 1 byte
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self.bwUnits = {'decimal': { # n * (10 ** u) = b; b / (10 ** u) = u
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0: (None, 'b', 'bit'),
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3: ('k', 'kb', 'kilobit'),
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6: ('M', 'Mb', 'megabit'),
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9: ('G', 'Gb', 'gigabit'),
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12: ('T', 'Tb', 'terabit'),
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13: ('P', 'Pb', 'petabit'),
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15: ('E', 'Eb', 'exabit'),
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18: ('Z', 'Zb', 'zettabit'),
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19: ('Y', 'Yb', 'yottabit')
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},
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'binary': { # n * (2 ** u) = b; b / (2 ** u) = u
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-1: ('semi-octet', 'quartet', 'quadbit'),
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10: ('Ki', 'Kib', 'kibibit'),
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20: ('Mi', 'Mib', 'mebibit'),
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30: ('Gi', 'Gib', 'gibibit'),
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40: ('Ti', 'Tib', 'tebibit'),
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50: ('Pi', 'Pib', 'pebibit'),
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60: ('Ei', 'Eib', 'exbibit'),
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70: ('Zi', 'Zib', 'zebibit'),
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80: ('Yi', 'Yib', 'yobibit')
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}}
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self.valid_storage = []
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for unit_type, convpair in self.storageUnits.items():
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for f, l in convpair.items():
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for suffix in l:
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if suffix not in self.valid_storage:
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self.valid_storage.append(suffix)
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self.valid_bw = []
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for unit_type, convpair in self.bwUnits.items():
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for f, l in convpair.items():
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for suffix in l:
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if suffix not in self.valid_bw:
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self.valid_bw.append(suffix)
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def convert(self, n, suffix, target = None):
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pass
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def convert(self, n, suffix):
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conversion = {}
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if suffix in self.valid_storage:
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conversion.update(self.convertStorage(n, suffix))
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b = conversion['B'] * 8
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conversion.update(self.convertBW(b, 'b'))
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elif suffix in self.valid_bw:
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conversion.update(self.convertBW(n, suffix))
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b = conversion['b'] / 8
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conversion.update(self.convertStorage(b, 'B'))
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return(conversion)
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def convertBW(self, n, suffix, target = None):
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inBits = n
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if suffix not in self.valid_bw:
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raise ValueError('suffix must be one of {0}'.format(', '.format(self.valid_bw)))
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if suffix != 'b':
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if self.bwUnits[suffix]:
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inBits = n * (10 ** self.bwUnits[suffix])
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else:
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inBits = None
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conversion = None
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base_factors = []
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if suffix not in self.valid_bw:
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raise ValueError('suffix is not a valid unit notation for this conversion')
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if target and target not in self.valid_bw:
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raise ValueError('target is not a valid unit notation for this conversion')
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for (_unit_type, _base) in (('decimal', 10), ('binary', 2)):
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if target and base_factors:
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break
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for u, suffixes in self.bwUnits[_unit_type].items():
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if all((target, inBits, base_factors)):
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break
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if suffix in suffixes:
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inBits = n * float(_base ** u)
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if target and target in suffixes:
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base_factors.append((_base, u, suffixes[1]))
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elif not target:
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base_factors.append((_base, u, suffixes[1]))
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if target:
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conversion = float(inBits) / float(base_factors[0][0] ** base_factors[0][1])
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else:
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if not isinstance(conversion, dict):
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conversion = {}
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for base, factor, suffix in base_factors:
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conversion[suffix] = float(inBits) / float(base ** factor)
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return(conversion)
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def convertStorage(self, n, suffix, target = None):
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inBytes = n
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inBytes = None
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conversion = None
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base_factors = []
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if suffix not in self.valid_storage:
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raise ValueError('suffix must be one of {0}'.format(', '.format(self.valid_storage)))
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if suffix == 'nibble':
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inBytes = n * 0.5
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elif suffix != 'B':
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inBytes = float(n << self.storageUnits[suffix])
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raise ValueError('suffix is not a valid unit notation for this conversion')
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if target and target not in self.valid_storage:
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raise ValueError('target is not a valid unit notation for this conversion')
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for (_unit_type, _base) in (('decimal', 10), ('binary', 2)):
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if target and base_factors:
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break
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for u, suffixes in self.storageUnits[_unit_type].items():
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if all((target, inBytes, base_factors)):
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break
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if suffix in suffixes:
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inBytes = n * float(_base ** u)
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if target and target in suffixes:
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base_factors.append((_base, u, suffixes[1]))
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elif not target:
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base_factors.append((_base, u, suffixes[1]))
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if target:
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conversion = float(inBytes / float(1 << self.storageUnits[target]))
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conversion = float(inBytes) / float(base_factors[0][0] ** base_factors[0][1])
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else:
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if not isinstance(conversion, dict):
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conversion = {}
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for unit, shifter in self.storageUnits.items():
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conversion[unit] = float(inBytes / float(1 << self.storageUnits[unit]))
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for base, factor, suffix in base_factors:
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conversion[suffix] = float(inBytes) / float(base ** factor)
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return(conversion)
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