821 lines
31 KiB
Python
821 lines
31 KiB
Python
# -*- python-mode -*-
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# -*- coding: UTF-8 -*-
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## Copyright (C) 2012-2013 Daniel Pavel
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##
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## This program is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published by
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## the Free Software Foundation; either version 2 of the License, or
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## (at your option) any later version.
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##
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## This program is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License along
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## with this program; if not, write to the Free Software Foundation, Inc.,
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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from __future__ import absolute_import, division, print_function, unicode_literals
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import math
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from copy import copy as _copy
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from logging import DEBUG as _DEBUG
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from logging import INFO as _INFO
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from logging import getLogger
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from .common import NamedInt as _NamedInt
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from .common import NamedInts as _NamedInts
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from .common import bytes2int as _bytes2int
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from .common import int2bytes as _int2bytes
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_log = getLogger(__name__)
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del getLogger
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#
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#
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#
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KIND = _NamedInts(toggle=0x01,
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choice=0x02,
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range=0x04,
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map_choice=0x0A,
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multiple_toggle=0x10)
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class Setting(object):
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"""A setting descriptor.
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Needs to be instantiated for each specific device."""
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__slots__ = ('name', 'label', 'description', 'kind', 'device_kind',
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'feature', '_rw', '_validator', '_device', '_value')
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def __init__(self,
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name,
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rw,
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validator,
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kind=None,
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label=None,
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description=None,
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device_kind=None,
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feature=None):
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assert name
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self.name = name
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self.label = label or name
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self.description = description
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self.device_kind = device_kind
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self.feature = feature
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self._rw = rw
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self._validator = validator
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assert kind is None or kind & validator.kind != 0
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self.kind = kind or validator.kind
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def __call__(self, device):
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assert not hasattr(self, '_value')
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# combined keyboards and touchpads (e.g., K400) break this assertion so don't use it
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# assert self.device_kind is None or device.kind in self.device_kind
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p = device.protocol
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if p == 1.0:
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# HID++ 1.0 devices do not support features
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assert self._rw.kind == RegisterRW.kind
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elif p >= 2.0:
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# HID++ 2.0 devices do not support registers
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assert self._rw.kind == FeatureRW.kind
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o = _copy(self)
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o._value = None
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o._device = device
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return o
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@property
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def choices(self):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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return self._validator.choices if self._validator.kind & KIND.choice else None
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@property
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def range(self):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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if self._validator.kind == KIND.range:
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return (self._validator.min_value, self._validator.max_value)
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def read(self, cached=True):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings read %r from %s", self.name, self._value,
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self._device)
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if self._value is None and self._device.persister:
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# We haven't read a value from the device yet,
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# maybe we have something in the configuration.
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self._value = self._device.persister.get(self.name)
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if cached and self._value is not None:
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if self._device.persister and self.name not in self._device.persister:
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# If this is a new device (or a new setting for an old device),
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# make sure to save its current value for the next time.
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self._device.persister[self.name] = self._value
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return self._value
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if self._device.online:
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reply = self._rw.read(self._device)
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if reply:
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self._value = self._validator.validate_read(reply)
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if self._device.persister and self.name not in self._device.persister:
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# Don't update the persister if it already has a value,
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# otherwise the first read might overwrite the value we wanted.
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self._device.persister[self.name] = self._value
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return self._value
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def write(self, value):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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assert value is not None
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings write %r to %s", self.name, value,
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self._device)
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if self._device.online:
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# Remember the value we're trying to set, even if the write fails.
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# This way even if the device is offline or some other error occurs,
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# the last value we've tried to write is remembered in the configuration.
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self._value = value
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if self._device.persister:
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self._device.persister[self.name] = value
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current_value = None
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if self._validator.needs_current_value:
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# the validator needs the current value, possibly to merge flag values
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current_value = self._rw.read(self._device)
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data_bytes = self._validator.prepare_write(value, current_value)
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if data_bytes is not None:
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings prepare write(%s) => %r",
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self.name, value, data_bytes)
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reply = self._rw.write(self._device, data_bytes)
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if not reply:
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# tell whomever is calling that the write failed
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return None
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return value
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def apply(self):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: apply %s (%s)", self.name, self._value,
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self._device)
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value = self.read()
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if value is not None:
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self.write(value)
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def __str__(self):
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if hasattr(self, '_value'):
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assert hasattr(self, '_device')
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return '<Setting([%s:%s] %s:%s=%s)>' % (
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self._rw.kind, self._validator.kind, self._device.codename,
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self.name, self._value)
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return '<Setting([%s:%s] %s)>' % (self._rw.kind, self._validator.kind,
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self.name)
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__unicode__ = __repr__ = __str__
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class Settings(Setting):
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"""A setting descriptor for multiple choices, being a map from keys to values.
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Needs to be instantiated for each specific device."""
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def read(self, cached=True):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings read %r from %s", self.name, self._value,
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self._device)
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if self._value is None and getattr(self._device, 'persister', None):
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# We haven't read a value from the device yet,
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# maybe we have something in the configuration.
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self._value = self._device.persister.get(self.name)
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if cached and self._value is not None:
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if getattr(self._device, 'persister',
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None) and self.name not in self._device.persister:
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# If this is a new device (or a new setting for an old device),
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# make sure to save its current value for the next time.
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self._device.persister[self.name] = self._value
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return self._value
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if self._device.online:
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reply_map = dict()
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for key, value in self._validator.choices.items():
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reply = self._rw.read(self._device, key)
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if reply:
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# keys are ints, because that is what the device uses,
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# encoded into strings because JSON requires strings as keys
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reply_map[str(int(key))] = self._validator.validate_read(
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reply, key)
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self._value = reply_map
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if getattr(self._device, 'persister',
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None) and self.name not in self._device.persister:
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# Don't update the persister if it already has a value,
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# otherwise the first read might overwrite the value we wanted.
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self._device.persister[self.name] = self._value
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return self._value
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def read_key(self, key, cached=True):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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assert key is not None
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings read %r key %r from %s", self.name,
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self._value, key, self._device)
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if self._value is None and getattr(self._device, 'persister', None):
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self._value = self._device.persister.get(self.name)
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if cached and self._value is not None:
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if getattr(self._device, 'persister',
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None) and self.name not in self._device.persister:
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self._device.persister[self.name] = self._value
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return self._value[str(int(key))]
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if self._device.online:
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reply = self._rw.read(self._device, key)
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if reply:
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self._value[str(int(key))] = self._validator.validate_read(
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reply, key)
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if getattr(self._device, 'persister',
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None) and self.name not in self._device.persister:
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self._device.persister[self.name] = self._value
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return self._value[str(int(key))]
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def write(self, map):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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assert map is not None
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings write %r to %s", self.name, map,
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self._device)
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if self._device.online:
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# Remember the value we're trying to set, even if the write fails.
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# This way even if the device is offline or some other error occurs,
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# the last value we've tried to write is remembered in the configuration.
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self._value = map
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if self._device.persister:
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self._device.persister[self.name] = map
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for key, value in map.items():
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data_bytes = self._validator.prepare_write(int(key), value)
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if data_bytes is not None:
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if _log.isEnabledFor(_DEBUG):
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_log.debug(
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"%s: settings prepare map write(%s,%s) => %r",
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self.name, key, value, data_bytes)
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reply = self._rw.write(self._device, int(key), data_bytes)
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if not reply:
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return None
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return map
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def write_key_value(self, key, value):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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assert key is not None
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assert value is not None
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings write key %r value %r to %s", self.name,
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key, value, self._device)
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if self._device.online:
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# Remember the value we're trying to set, even if the write fails.
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# This way even if the device is offline or some other error occurs,
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# the last value we've tried to write is remembered in the configuration.
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self._value[str(key)] = value
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if self._device.persister:
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self._device.persister[self.name] = self._value
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data_bytes = self._validator.prepare_write(int(key), value)
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if data_bytes is not None:
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if _log.isEnabledFor(_DEBUG):
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_log.debug(
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"%s: settings prepare key value write(%s,%s) => %r",
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self.name, key, value, data_bytes)
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reply = self._rw.write(self._device, int(key), data_bytes)
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if not reply:
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# tell whomever is calling that the write failed
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return None
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return value
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class BitFieldSetting(Setting):
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"""A setting descriptor for a set of choices represented by one bit each, being a map from options to booleans.
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Needs to be instantiated for each specific device."""
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def read(self, cached=True):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings read %r from %s", self.name, self._value,
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self._device)
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if self._value is None and getattr(self._device, 'persister', None):
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# We haven't read a value from the device yet,
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# maybe we have something in the configuration.
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self._value = self._device.persister.get(self.name)
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if cached and self._value is not None:
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if getattr(self._device, 'persister',
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None) and self.name not in self._device.persister:
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# If this is a new device (or a new setting for an old device),
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# make sure to save its current value for the next time.
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self._device.persister[self.name] = self._value
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return self._value
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if self._device.online:
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reply_map = dict()
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reply = self._rw.read(self._device)
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if reply:
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# keys are ints, because that is what the device uses,
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# encoded into strings because JSON requires strings as keys
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reply_map = self._validator.validate_read(reply)
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self._value = reply_map
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if getattr(self._device, 'persister',
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None) and self.name not in self._device.persister:
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# Don't update the persister if it already has a value,
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# otherwise the first read might overwrite the value we wanted.
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self._device.persister[self.name] = self._value
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return self._value
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def read_key(self, key, cached=True):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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assert key is not None
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings read %r key %r from %s", self.name,
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self._value, key, self._device)
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if self._value is None and getattr(self._device, 'persister', None):
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self._value = self._device.persister.get(self.name)
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if cached and self._value is not None:
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if getattr(self._device, 'persister',
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None) and self.name not in self._device.persister:
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self._device.persister[self.name] = self._value
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return self._value[str(int(key))]
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if self._device.online:
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reply = self._rw.read(self._device, key)
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if reply:
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self._value = self._validator.validate_read(reply)
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if getattr(self._device, 'persister',
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None) and self.name not in self._device.persister:
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self._device.persister[self.name] = self._value
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return self._value[str(int(key))]
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def write(self, map):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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assert map is not None
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings write %r to %s", self.name, map,
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self._device)
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if self._device.online:
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# Remember the value we're trying to set, even if the write fails.
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# This way even if the device is offline or some other error occurs,
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# the last value we've tried to write is remembered in the configuration.
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self._value = map
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if self._device.persister:
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self._device.persister[self.name] = map
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data_bytes = self._validator.prepare_write(self._value)
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if data_bytes is not None:
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings prepare map write(%s) => %r",
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self.name, self._value, data_bytes)
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reply = self._rw.write(self._device, data_bytes)
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if not reply:
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return None
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return map
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def write_key_value(self, key, value):
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assert hasattr(self, '_value')
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assert hasattr(self, '_device')
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assert key is not None
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assert value is not None
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if _log.isEnabledFor(_DEBUG):
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_log.debug("%s: settings write key %r value %r to %s", self.name,
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key, value, self._device)
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|
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if self._device.online:
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# Remember the value we're trying to set, even if the write fails.
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# This way even if the device is offline or some other error occurs,
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# the last value we've tried to write is remembered in the configuration.
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value = bool(value)
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self._value[str(key)] = value
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if self._device.persister:
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self._device.persister[self.name] = self._value
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data_bytes = self._validator.prepare_write(self._value)
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if data_bytes is not None:
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if _log.isEnabledFor(_DEBUG):
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_log.debug(
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"%s: settings prepare key value write(%s,%s) => %r",
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self.name, key, str(value), data_bytes)
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reply = self._rw.write(self._device, data_bytes)
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if not reply:
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# tell whomever is calling that the write failed
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return None
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return value
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#
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# read/write low-level operators
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|
#
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|
|
|
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class RegisterRW(object):
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__slots__ = ('register', )
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|
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kind = _NamedInt(0x01, 'register')
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def __init__(self, register):
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assert isinstance(register, int)
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self.register = register
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def read(self, device):
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return device.read_register(self.register)
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def write(self, device, data_bytes):
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return device.write_register(self.register, data_bytes)
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class FeatureRW(object):
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__slots__ = ('feature', 'read_fnid', 'write_fnid')
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kind = _NamedInt(0x02, 'feature')
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default_read_fnid = 0x00
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default_write_fnid = 0x10
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|
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def __init__(self,
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feature,
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read_fnid=default_read_fnid,
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write_fnid=default_write_fnid):
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assert isinstance(feature, _NamedInt)
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self.feature = feature
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self.read_fnid = read_fnid
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self.write_fnid = write_fnid
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def read(self, device):
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assert self.feature is not None
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return device.feature_request(self.feature, self.read_fnid)
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def write(self, device, data_bytes):
|
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assert self.feature is not None
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return device.feature_request(self.feature, self.write_fnid,
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data_bytes)
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|
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|
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class FeatureRWMap(FeatureRW):
|
|
kind = _NamedInt(0x02, 'feature')
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|
default_read_fnid = 0x00
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default_write_fnid = 0x10
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default_key_bytes = 1
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|
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def __init__(self,
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feature,
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|
read_fnid=default_read_fnid,
|
|
write_fnid=default_write_fnid,
|
|
key_bytes=default_key_bytes):
|
|
assert isinstance(feature, _NamedInt)
|
|
self.feature = feature
|
|
self.read_fnid = read_fnid
|
|
self.write_fnid = write_fnid
|
|
self.key_bytes = key_bytes
|
|
|
|
def read(self, device, key):
|
|
assert self.feature is not None
|
|
key_bytes = _int2bytes(key, self.key_bytes)
|
|
return device.feature_request(self.feature, self.read_fnid, key_bytes)
|
|
|
|
def write(self, device, key, data_bytes):
|
|
assert self.feature is not None
|
|
key_bytes = _int2bytes(key, self.key_bytes)
|
|
return device.feature_request(self.feature, self.write_fnid, key_bytes,
|
|
data_bytes)
|
|
|
|
|
|
#
|
|
# value validators
|
|
# handle the conversion from read bytes, to setting value, and back
|
|
#
|
|
|
|
|
|
class BooleanValidator(object):
|
|
__slots__ = ('true_value', 'false_value', 'mask', 'needs_current_value')
|
|
|
|
kind = KIND.toggle
|
|
default_true = 0x01
|
|
default_false = 0x00
|
|
# mask specifies all the affected bits in the value
|
|
default_mask = 0xFF
|
|
|
|
def __init__(self,
|
|
true_value=default_true,
|
|
false_value=default_false,
|
|
mask=default_mask):
|
|
if isinstance(true_value, int):
|
|
assert isinstance(false_value, int)
|
|
if mask is None:
|
|
mask = self.default_mask
|
|
else:
|
|
assert isinstance(mask, int)
|
|
assert true_value & false_value == 0
|
|
assert true_value & mask == true_value
|
|
assert false_value & mask == false_value
|
|
self.needs_current_value = (mask != self.default_mask)
|
|
elif isinstance(true_value, bytes):
|
|
if false_value is None or false_value == self.default_false:
|
|
false_value = b'\x00' * len(true_value)
|
|
else:
|
|
assert isinstance(false_value, bytes)
|
|
if mask is None or mask == self.default_mask:
|
|
mask = b'\xFF' * len(true_value)
|
|
else:
|
|
assert isinstance(mask, bytes)
|
|
assert len(mask) == len(true_value) == len(false_value)
|
|
tv = _bytes2int(true_value)
|
|
fv = _bytes2int(false_value)
|
|
mv = _bytes2int(mask)
|
|
assert tv != fv # true and false might be something other than bit values
|
|
assert tv & mv == tv
|
|
assert fv & mv == fv
|
|
self.needs_current_value = any(m != b'\xFF' for m in mask)
|
|
else:
|
|
raise Exception("invalid mask '%r', type %s" % (mask, type(mask)))
|
|
|
|
self.true_value = true_value
|
|
self.false_value = false_value
|
|
self.mask = mask
|
|
|
|
def validate_read(self, reply_bytes):
|
|
if isinstance(self.mask, int):
|
|
reply_value = ord(reply_bytes[:1]) & self.mask
|
|
if _log.isEnabledFor(_DEBUG):
|
|
_log.debug("BooleanValidator: validate read %r => %02X",
|
|
reply_bytes, reply_value)
|
|
if reply_value == self.true_value:
|
|
return True
|
|
if reply_value == self.false_value:
|
|
return False
|
|
_log.warn("BooleanValidator: reply %02X mismatched %02X/%02X/%02X",
|
|
reply_value, self.true_value, self.false_value,
|
|
self.mask)
|
|
return False
|
|
|
|
count = len(self.mask)
|
|
mask = _bytes2int(self.mask)
|
|
reply_value = _bytes2int(reply_bytes[:count]) & mask
|
|
|
|
true_value = _bytes2int(self.true_value)
|
|
if reply_value == true_value:
|
|
return True
|
|
|
|
false_value = _bytes2int(self.false_value)
|
|
if reply_value == false_value:
|
|
return False
|
|
|
|
_log.warn("BooleanValidator: reply %r mismatched %r/%r/%r",
|
|
reply_bytes, self.true_value, self.false_value, self.mask)
|
|
return False
|
|
|
|
def prepare_write(self, new_value, current_value=None):
|
|
if new_value is None:
|
|
new_value = False
|
|
else:
|
|
assert isinstance(new_value, bool)
|
|
|
|
to_write = self.true_value if new_value else self.false_value
|
|
|
|
if isinstance(self.mask, int):
|
|
if current_value is not None and self.needs_current_value:
|
|
to_write |= ord(current_value[:1]) & (0xFF ^ self.mask)
|
|
if current_value is not None and to_write == ord(
|
|
current_value[:1]):
|
|
return None
|
|
else:
|
|
to_write = bytearray(to_write)
|
|
count = len(self.mask)
|
|
for i in range(0, count):
|
|
b = ord(to_write[i:i + 1])
|
|
m = ord(self.mask[i:i + 1])
|
|
assert b & m == b
|
|
# b &= m
|
|
if current_value is not None and self.needs_current_value:
|
|
b |= ord(current_value[i:i + 1]) & (0xFF ^ m)
|
|
to_write[i] = b
|
|
to_write = bytes(to_write)
|
|
|
|
if current_value is not None and to_write == current_value[:len(
|
|
to_write)]:
|
|
return None
|
|
|
|
if _log.isEnabledFor(_DEBUG):
|
|
_log.debug("BooleanValidator: prepare_write(%s, %s) => %r",
|
|
new_value, current_value, to_write)
|
|
|
|
return to_write
|
|
|
|
|
|
class BitFieldValidator(object):
|
|
__slots__ = ('byte_count', 'options')
|
|
|
|
kind = KIND.multiple_toggle
|
|
|
|
def __init__(self, options, byte_count=None):
|
|
assert (isinstance(options, list))
|
|
self.options = options
|
|
self.byte_count = (max(x.bit_length() for x in options) + 7) // 8
|
|
if byte_count:
|
|
assert (isinstance(byte_count, int)
|
|
and byte_count >= self.byte_count)
|
|
self.byte_count = byte_count
|
|
|
|
def validate_read(self, reply_bytes):
|
|
r = _bytes2int(reply_bytes[:self.byte_count])
|
|
value = {str(int(k)): False for k in self.options}
|
|
m = 1
|
|
for i in range(8 * self.byte_count):
|
|
if m in self.options:
|
|
value[str(int(m))] = bool(r & m)
|
|
m <<= 1
|
|
return value
|
|
|
|
def prepare_write(self, new_value):
|
|
assert (isinstance(new_value, dict))
|
|
w = 0
|
|
for k, v in new_value.items():
|
|
if v:
|
|
w |= int(k)
|
|
return _int2bytes(w, self.byte_count)
|
|
|
|
|
|
class ChoicesValidator(object):
|
|
__slots__ = ('choices', 'flag', '_bytes_count', 'needs_current_value')
|
|
|
|
kind = KIND.choice
|
|
"""Translates between NamedInts and a byte sequence.
|
|
:param choices: a list of NamedInts
|
|
:param bytes_count: the size of the derived byte sequence. If None, it
|
|
will be calculated from the choices."""
|
|
def __init__(self, choices, bytes_count=None):
|
|
assert choices is not None
|
|
assert isinstance(choices, _NamedInts)
|
|
assert len(choices) > 2
|
|
self.choices = choices
|
|
self.needs_current_value = False
|
|
|
|
max_bits = max(x.bit_length() for x in choices)
|
|
self._bytes_count = (max_bits // 8) + (1 if max_bits % 8 else 0)
|
|
if bytes_count:
|
|
assert self._bytes_count <= bytes_count
|
|
self._bytes_count = bytes_count
|
|
assert self._bytes_count < 8
|
|
|
|
def validate_read(self, reply_bytes):
|
|
reply_value = _bytes2int(reply_bytes[:self._bytes_count])
|
|
valid_value = self.choices[reply_value]
|
|
assert valid_value is not None, "%s: failed to validate read value %02X" % (
|
|
self.__class__.__name__, reply_value)
|
|
return valid_value
|
|
|
|
def prepare_write(self, new_value, current_value=None):
|
|
if new_value is None:
|
|
choice = self.choices[:][0]
|
|
else:
|
|
if isinstance(new_value, int):
|
|
choice = self.choices[new_value]
|
|
elif int(new_value) in self.choices:
|
|
choice = self.choices[int(new_value)]
|
|
elif new_value in self.choices:
|
|
choice = self.choices[new_value]
|
|
else:
|
|
raise ValueError(new_value)
|
|
|
|
if choice is None:
|
|
raise ValueError("invalid choice %r" % new_value)
|
|
assert isinstance(choice, _NamedInt)
|
|
return choice.bytes(self._bytes_count)
|
|
|
|
|
|
class ChoicesMapValidator(ChoicesValidator):
|
|
kind = KIND.map_choice
|
|
|
|
def __init__(self,
|
|
choices_map,
|
|
key_bytes_count=None,
|
|
skip_bytes_count=None,
|
|
value_bytes_count=None,
|
|
extra_default=None):
|
|
assert choices_map is not None
|
|
assert isinstance(choices_map, dict)
|
|
max_key_bits = 0
|
|
max_value_bits = 0
|
|
for key, choices in choices_map.items():
|
|
assert isinstance(key, _NamedInt)
|
|
assert isinstance(choices, list)
|
|
max_key_bits = max(max_key_bits, key.bit_length())
|
|
for key_value in choices:
|
|
assert isinstance(key_value, _NamedInt)
|
|
max_value_bits = max(max_value_bits, key_value.bit_length())
|
|
self.choices = choices_map
|
|
self.needs_current_value = False
|
|
self.extra_default = extra_default
|
|
|
|
self._key_bytes_count = (max_key_bits + 7) // 8
|
|
if key_bytes_count:
|
|
assert self._key_bytes_count <= key_bytes_count
|
|
self._key_bytes_count = key_bytes_count
|
|
self._value_bytes_count = (max_value_bits + 7) // 8
|
|
if value_bytes_count:
|
|
assert self._value_bytes_count <= value_bytes_count
|
|
self._value_bytes_count = value_bytes_count
|
|
self._skip_bytes_count = skip_bytes_count if skip_bytes_count is not None else 0
|
|
self._bytes_count = self._key_bytes_count + self._skip_bytes_count + self._value_bytes_count
|
|
|
|
def validate_read(self, reply_bytes, key):
|
|
start = self._key_bytes_count + self._skip_bytes_count
|
|
end = start + self._value_bytes_count
|
|
reply_value = _bytes2int(reply_bytes[start:end])
|
|
# reprogrammable keys starts out as 0, which is not a choice, so don't use assert here
|
|
if self.extra_default is not None and self.extra_default == reply_value:
|
|
return int(self.choices[key][0])
|
|
assert reply_value in self.choices[
|
|
key], "%s: failed to validate read value %02X" % (
|
|
self.__class__.__name__, reply_value)
|
|
return reply_value
|
|
|
|
def prepare_write(self, key, new_value):
|
|
choices = self.choices[key]
|
|
if new_value not in choices and new_value != self.extra_default:
|
|
raise ValueError("invalid choice %r" % new_value)
|
|
return _int2bytes(new_value,
|
|
self._skip_bytes_count + self._value_bytes_count)
|
|
|
|
|
|
class RangeValidator(object):
|
|
__slots__ = ('min_value', 'max_value', 'flag', '_bytes_count',
|
|
'needs_current_value')
|
|
|
|
kind = KIND.range
|
|
"""Translates between integers and a byte sequence.
|
|
:param min_value: minimum accepted value (inclusive)
|
|
:param max_value: maximum accepted value (inclusive)
|
|
:param bytes_count: the size of the derived byte sequence. If None, it
|
|
will be calculated from the range."""
|
|
def __init__(self, min_value, max_value, bytes_count=None):
|
|
assert max_value > min_value
|
|
self.min_value = min_value
|
|
self.max_value = max_value
|
|
self.needs_current_value = False
|
|
|
|
self._bytes_count = math.ceil(math.log(max_value + 1, 256))
|
|
if bytes_count:
|
|
assert self._bytes_count <= bytes_count
|
|
self._bytes_count = bytes_count
|
|
assert self._bytes_count < 8
|
|
|
|
def validate_read(self, reply_bytes):
|
|
reply_value = _bytes2int(reply_bytes[:self._bytes_count])
|
|
assert reply_value >= self.min_value, "%s: failed to validate read value %02X" % (
|
|
self.__class__.__name__, reply_value)
|
|
assert reply_value <= self.max_value, "%s: failed to validate read value %02X" % (
|
|
self.__class__.__name__, reply_value)
|
|
return reply_value
|
|
|
|
def prepare_write(self, new_value, current_value=None):
|
|
if new_value < self.min_value or new_value > self.max_value:
|
|
raise ValueError("invalid choice %r" % new_value)
|
|
return _int2bytes(new_value, self._bytes_count)
|