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SickRage/lib/hachoir_core/field/float.py
echel0n 0d9fbc1ad7 Welcome to our SickBeard-TVRage Edition ...
This version of SickBeard uses both TVDB and TVRage to search and gather it's series data from allowing you to now have access to and download shows that you couldn't before because of being locked into only what TheTVDB had to offer.

Also this edition is based off the code we used in our XEM editon so it does come with scene numbering support as well as all the other features our XEM edition has to offer.

Please before using this with your existing database (sickbeard.db) please make a backup copy of it and delete any other database files such as cache.db and failed.db if present, we HIGHLY recommend starting out with no database files at all to make this a fresh start but the choice is at your own risk!

Enjoy!
2014-03-09 22:39:12 -07:00

100 lines
3.5 KiB
Python

from lib.hachoir_core.field import Bit, Bits, FieldSet
from lib.hachoir_core.endian import BIG_ENDIAN, LITTLE_ENDIAN
import struct
# Make sure that we use right struct types
assert struct.calcsize("f") == 4
assert struct.calcsize("d") == 8
assert struct.unpack("<d", "\x1f\x85\xebQ\xb8\x1e\t@")[0] == 3.14
assert struct.unpack(">d", "\xc0\0\0\0\0\0\0\0")[0] == -2.0
class FloatMantissa(Bits):
def createValue(self):
value = Bits.createValue(self)
return 1 + float(value) / (2 ** self.size)
def createRawDisplay(self):
return unicode(Bits.createValue(self))
class FloatExponent(Bits):
def __init__(self, parent, name, size):
Bits.__init__(self, parent, name, size)
self.bias = 2 ** (size-1) - 1
def createValue(self):
return Bits.createValue(self) - self.bias
def createRawDisplay(self):
return unicode(self.value + self.bias)
def floatFactory(name, format, mantissa_bits, exponent_bits, doc):
size = 1 + mantissa_bits + exponent_bits
class Float(FieldSet):
static_size = size
__doc__ = doc
def __init__(self, parent, name, description=None):
assert parent.endian in (BIG_ENDIAN, LITTLE_ENDIAN)
FieldSet.__init__(self, parent, name, description, size)
if format:
if self._parent.endian == BIG_ENDIAN:
self.struct_format = ">"+format
else:
self.struct_format = "<"+format
else:
self.struct_format = None
def createValue(self):
"""
Create float value: use struct.unpack() when it's possible
(32 and 64-bit float) or compute it with :
mantissa * (2.0 ** exponent)
This computation may raise an OverflowError.
"""
if self.struct_format:
raw = self._parent.stream.readBytes(
self.absolute_address, self._size//8)
try:
return struct.unpack(self.struct_format, raw)[0]
except struct.error, err:
raise ValueError("[%s] conversion error: %s" %
(self.__class__.__name__, err))
else:
try:
value = self["mantissa"].value * (2.0 ** float(self["exponent"].value))
if self["negative"].value:
return -(value)
else:
return value
except OverflowError:
raise ValueError("[%s] floating point overflow" %
self.__class__.__name__)
def createFields(self):
yield Bit(self, "negative")
yield FloatExponent(self, "exponent", exponent_bits)
if 64 <= mantissa_bits:
yield Bit(self, "one")
yield FloatMantissa(self, "mantissa", mantissa_bits-1)
else:
yield FloatMantissa(self, "mantissa", mantissa_bits)
cls = Float
cls.__name__ = name
return cls
# 32-bit float (standart: IEEE 754/854)
Float32 = floatFactory("Float32", "f", 23, 8,
"Floating point number: format IEEE 754 int 32 bit")
# 64-bit float (standart: IEEE 754/854)
Float64 = floatFactory("Float64", "d", 52, 11,
"Floating point number: format IEEE 754 in 64 bit")
# 80-bit float (standart: IEEE 754/854)
Float80 = floatFactory("Float80", None, 64, 15,
"Floating point number: format IEEE 754 in 80 bit")