Python pyasn1.compat.octets.null() Examples

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        if value == 0:  # shortcut for zero value
            if self.supportCompactZero:
                # this seems to be a correct way for encoding zeros
                return null, 0
            else:
                # this seems to be a widespread way for encoding zeros
                return ints2octs((0,)), 0
        octets = []
        value = int(value) # to save on ops on asn1 type
        while 1:
            octets.insert(0, value & 0xff)
            if value == 0 or value == -1:
                break
            value = value >> 8
        if value == 0 and octets[0] & 0x80:
            octets.insert(0, 0)
        while len(octets) > 1 and \
                  (octets[0] == 0 and octets[1] & 0x80 == 0 or \
                   octets[0] == 0xff and octets[1] & 0x80 != 0):
            del octets[0]
        return ints2octs(octets), 0 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        if not maxChunkSize or len(value) <= maxChunkSize*8:
            r = {}; l = len(value); p = 0; j = 7
            while p < l:
                i, j = divmod(p, 8)
                r[i] = r.get(i,0) | value[p]<<(7-j)
                p = p + 1
            keys = list(r); keys.sort()
            return int2oct(7-j) + ints2octs([r[k] for k in keys]), 0
        else:
            pos = 0; substrate = null
            while 1:
                # count in octets
                v = value.clone(value[pos*8:pos*8+maxChunkSize*8])
                if not v:
                    break
                substrate = substrate + encodeFun(v, defMode, maxChunkSize)
                pos = pos + maxChunkSize
            return substrate, 1 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        if value == 0:  # shortcut for zero value
            if self.supportCompactZero:
                # this seems to be a correct way for encoding zeros
                return null, 0
            else:
                # this seems to be a widespread way for encoding zeros
                return ints2octs((0,)), 0
        octets = []
        value = int(value) # to save on ops on asn1 type
        while 1:
            octets.insert(0, value & 0xff)
            if value == 0 or value == -1:
                break
            value = value >> 8
        if value == 0 and octets[0] & 0x80:
            octets.insert(0, 0)
        while len(octets) > 1 and \
                  (octets[0] == 0 and octets[1] & 0x80 == 0 or \
                   octets[0] == 0xff and octets[1] & 0x80 != 0):
            del octets[0]
        return ints2octs(octets), 0 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        if value == 0:  # shortcut for zero value
            if self.supportCompactZero:
                # this seems to be a correct way for encoding zeros
                return null, 0
            else:
                # this seems to be a widespread way for encoding zeros
                return ints2octs((0,)), 0
        octets = []
        value = int(value) # to save on ops on asn1 type
        while 1:
            octets.insert(0, value & 0xff)
            if value == 0 or value == -1:
                break
            value = value >> 8
        if value == 0 and octets[0] & 0x80:
            octets.insert(0, 0)
        while len(octets) > 1 and \
                  (octets[0] == 0 and octets[1] & 0x80 == 0 or \
                   octets[0] == 0xff and octets[1] & 0x80 != 0):
            del octets[0]
        return ints2octs(octets), 0 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        if not maxChunkSize or len(value) <= maxChunkSize*8:
            r = {}; l = len(value); p = 0; j = 7
            while p < l:
                i, j = divmod(p, 8)
                r[i] = r.get(i,0) | value[p]<<(7-j)
                p = p + 1
            keys = list(r); keys.sort()
            return int2oct(7-j) + ints2octs([r[k] for k in keys]), 0
        else:
            pos = 0; substrate = null
            while 1:
                # count in octets
                v = value.clone(value[pos*8:pos*8+maxChunkSize*8])
                if not v:
                    break
                substrate = substrate + encodeFun(v, defMode, maxChunkSize)
                pos = pos + maxChunkSize
            return substrate, 1 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        value.setDefaultComponents()
        value.verifySizeSpec()
        substrate = null
        idx = len(value)
        while idx > 0:
            idx -= 1
            if value[idx] is None:  # Optional component
                continue
            component = value.getDefaultComponentByPosition(idx)
            if component is not None and component == value[idx]:
                continue
            substrate = encodeFun(
                value[idx], defMode, maxChunkSize
            ) + substrate
        return substrate, 1 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        if not maxChunkSize or len(value) <= maxChunkSize * 8:
            out_len = (len(value) + 7) // 8
            out_list = out_len * [0]
            j = 7
            i = -1
            for val in value:
                j += 1
                if j == 8:
                    i += 1
                    j = 0
                out_list[i] |= val << (7 - j)
            return int2oct(7 - j) + ints2octs(out_list), 0
        else:
            pos = 0
            substrate = null
            while True:
                # count in octets
                v = value.clone(value[pos * 8:pos * 8 + maxChunkSize * 8])
                if not v:
                    break
                substrate = substrate + encodeFun(v, defMode, maxChunkSize)
                pos += maxChunkSize
            return substrate, 1 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        if value == 0:  # shortcut for zero value
            if self.supportCompactZero:
                # this seems to be a correct way for encoding zeros
                return null, 0
            else:
                # this seems to be a widespread way for encoding zeros
                return ints2octs((0,)), 0
        octets = []
        value = int(value)  # to save on ops on asn1 type
        while True:
            octets.insert(0, value & 0xff)
            if value == 0 or value == -1:
                break
            value >>= 8
        if value == 0 and octets[0] & 0x80:
            octets.insert(0, 0)
        while len(octets) > 1 and \
                (octets[0] == 0 and octets[1] & 0x80 == 0 or
                 octets[0] == 0xff and octets[1] & 0x80 != 0):
            del octets[0]
        return ints2octs(octets), 0 

def getCmd(self, authData, transportTarget, varNames, cbInfo,
               lookupNames=False, lookupValues=False,
               contextEngineId=None, contextName=null):

        def __cbFun(snmpEngine, sendRequestHandle,
                    errorIndication, errorStatus, errorIndex,
                    varBindTable, cbInfo):
            cbFun, cbCtx = cbInfo
            cbFun(sendRequestHandle,
                  errorIndication, errorStatus, errorIndex,
                  varBindTable, cbCtx)

        # for backward compatibility
        if contextName is null and authData.contextName:
            contextName = authData.contextName

        return getCmd(
            self.snmpEngine, 
            authData, transportTarget,
            ContextData(contextEngineId, contextName),
            *[(x, self._null) for x in varNames],
            **dict(cbFun=__cbFun, cbCtx=cbInfo,
                   lookupMib=lookupNames or lookupValues)
        ) 

def nextCmd(self, authData, transportTarget, varNames, cbInfo,
                lookupNames=False, lookupValues=False,
                contextEngineId=None, contextName=null):

        def __cbFun(snmpEngine, sendRequestHandle,
                    errorIndication, errorStatus, errorIndex,
                    varBindTable, cbInfo):
            cbFun, cbCtx = cbInfo
            return cbFun(sendRequestHandle,
                         errorIndication, errorStatus, errorIndex,
                         varBindTable, cbCtx)

        # for backward compatibility
        if contextName is null and authData.contextName:
            contextName = authData.contextName

        return nextCmd(
            self.snmpEngine,
            authData, transportTarget,
            ContextData(contextEngineId, contextName),
            *[(x, self._null) for x in varNames],
            **dict(cbFun=__cbFun, cbCtx=cbInfo,
                   lookupMib=lookupNames or lookupValues)
        ) 

def bulkCmd(self, authData, transportTarget,
                nonRepeaters, maxRepetitions, *varNames, **kwargs):
        if 'lookupNames' not in kwargs:
            kwargs['lookupNames'] = False
        if 'lookupValues' not in kwargs:
            kwargs['lookupValues'] = False
        if 'lexicographicMode' not in kwargs:
            kwargs['lexicographicMode'] = False
        varBindTable = []
        for errorIndication, \
                errorStatus, errorIndex, \
                varBinds \
                in sync.bulkCmd(self.snmpEngine, authData,
                                transportTarget,
                                ContextData(kwargs.get('contextEngineId'),
                                            kwargs.get('contextName', null)),
                                nonRepeaters, maxRepetitions,
                                *[ (x, self._null) for x in varNames ],
                                **kwargs):
            if errorIndication or errorStatus:
                return errorIndication, errorStatus, errorIndex, varBinds

            varBindTable.append(varBinds)

        return errorIndication, errorStatus, errorIndex, varBindTable 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        if value == 0:  # shortcut for zero value
            if self.supportCompactZero:
                # this seems to be a correct way for encoding zeros
                return null, 0
            else:
                # this seems to be a widespread way for encoding zeros
                return ints2octs((0,)), 0
        octets = []
        value = int(value) # to save on ops on asn1 type
        while 1:
            octets.insert(0, value & 0xff)
            if value == 0 or value == -1:
                break
            value = value >> 8
        if value == 0 and octets[0] & 0x80:
            octets.insert(0, 0)
        while len(octets) > 1 and \
                  (octets[0] == 0 and octets[1] & 0x80 == 0 or \
                   octets[0] == 0xff and octets[1] & 0x80 != 0):
            del octets[0]
        return ints2octs(octets), 0 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        if not maxChunkSize or len(value) <= maxChunkSize*8:
            out_len = (len(value) + 7) // 8
            out_list = out_len * [0]
            j = 7
            i = -1
            for val in value:
                j += 1
                if j == 8:
                    i += 1
                    j = 0
                out_list[i] = out_list[i] | val << (7-j)
            return int2oct(7-j) + ints2octs(out_list), 0
        else:
            pos = 0; substrate = null
            while 1:
                # count in octets
                v = value.clone(value[pos*8:pos*8+maxChunkSize*8])
                if not v:
                    break
                substrate = substrate + encodeFun(v, defMode, maxChunkSize)
                pos = pos + maxChunkSize
            return substrate, 1 

def nextCmd(self, authData, transportTarget, *varNames, **kwargs):
        if 'lookupNames' not in kwargs:
            kwargs['lookupNames'] = False
        if 'lookupValues' not in kwargs:
            kwargs['lookupValues'] = False
        if 'lexicographicMode' not in kwargs:
            kwargs['lexicographicMode'] = False
        varBindTable = []
        for errorIndication, \
                errorStatus, errorIndex, \
                varBinds \
                in sync.nextCmd(self.snmpEngine, authData, transportTarget,
                                ContextData(kwargs.get('contextEngineId'),
                                            kwargs.get('contextName', null)),
                                *[ (x, self._null) for x in varNames ],
                                **kwargs):
            if errorIndication or errorStatus:
                return errorIndication, errorStatus, errorIndex, varBinds

            varBindTable.append(varBinds)

        return errorIndication, errorStatus, errorIndex, varBindTable 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        if not maxChunkSize or len(value) <= maxChunkSize*8:
            out_len = (len(value) + 7) // 8
            out_list = out_len * [0]
            j = 7
            i = -1
            for val in value:
                j += 1
                if j == 8:
                    i += 1
                    j = 0
                out_list[i] = out_list[i] | val << (7-j)
            return int2oct(7-j) + ints2octs(out_list), 0
        else:
            pos = 0; substrate = null
            while 1:
                # count in octets
                v = value.clone(value[pos*8:pos*8+maxChunkSize*8])
                if not v:
                    break
                substrate = substrate + encodeFun(v, defMode, maxChunkSize)
                pos = pos + maxChunkSize
            return substrate, 1 

def setCmd(self, authData, transportTarget, varBinds, cbInfo,
               lookupNames=False, lookupValues=False,
               contextEngineId=None, contextName=null):

        def __cbFun(snmpEngine, sendRequestHandle,
                    errorIndication, errorStatus, errorIndex,
                    varBindTable, cbInfo):
            cbFun, cbCtx = cbInfo
            cbFun(sendRequestHandle,
                  errorIndication, errorStatus, errorIndex,
                  varBindTable, cbCtx)

        # for backward compatibility
        if contextName is null and authData.contextName:
            contextName = authData.contextName

        
        return setCmd(
            self.snmpEngine,
            authData, transportTarget,
            ContextData(contextEngineId, contextName),
            *varBinds, 
            **dict(cbFun=__cbFun, cbCtx=cbInfo,
                   lookupMib=lookupNames or lookupValues)
        ) 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        value.verifySizeSpec()
        substrate = null; idx = len(value)
        while idx > 0:
            idx = idx - 1
            substrate = encodeFun(
                value[idx], defMode, maxChunkSize
                ) + substrate
        return substrate, 1 

def encodeValue(self, encodeFun, client, defMode, maxChunkSize):
        if isinstance(client, univ.SequenceAndSetBase):
            client.setDefaultComponents()
        client.verifySizeSpec()
        substrate = null; idx = len(client)
        # This is certainly a hack but how else do I distinguish SetOf
        # from Set if they have the same tags&constraints?
        if isinstance(client, univ.SequenceAndSetBase):
            # Set
            comps = []
            while idx > 0:
                idx = idx - 1
                if client[idx] is None:  # Optional component
                    continue
                if client.getDefaultComponentByPosition(idx) == client[idx]:
                    continue
                comps.append(client[idx])
            comps.sort(key=lambda x: isinstance(x, univ.Choice) and \
                                     x.getMinTagSet() or x.getTagSet())
            for c in comps:
                substrate += encodeFun(c, defMode, maxChunkSize)
        else:
            # SetOf
            compSubs = []
            while idx > 0:
                idx = idx - 1
                compSubs.append(
                    encodeFun(client[idx], defMode, maxChunkSize)
                    )
            compSubs.sort()  # perhaps padding's not needed
            substrate = null
            for compSub in compSubs:
                substrate += compSub
        return substrate, 1 

def encodeLength(self, length, defMode):
        if not defMode and self.supportIndefLenMode:
            return int2oct(0x80)
        if length < 0x80:
            return int2oct(length)
        else:
            substrate = null
            while length:
                substrate = int2oct(length&0xff) + substrate
                length = length >> 8
            substrateLen = len(substrate)
            if substrateLen > 126:
                raise Error('Length octets overflow (%d)' % substrateLen)
            return int2oct(0x80 | substrateLen) + substrate 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        return null, 0 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        value.setDefaultComponents()
        value.verifySizeSpec()
        substrate = null; idx = len(value)
        while idx > 0:
            idx = idx - 1
            if value[idx] is None:  # Optional component
                continue
            component = value.getDefaultComponentByPosition(idx)
            if component is not None and component == value[idx]:
                continue
            substrate = encodeFun(
                value[idx], defMode, maxChunkSize
                ) + substrate
        return substrate, 1 

def _encodeEndOfOctets(self, encodeFun, defMode):
        if defMode or not self.supportIndefLenMode:
            return null
        else:
            return encodeFun(eoo.endOfOctets, defMode) 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        return null, 0 

def indefLenValueDecoder(self, substrate, asn1Spec,
                             tagSet=None, length=None, state=None,
                             decodeFun=None, substrateFun=None,
                             **options):
        if substrateFun and substrateFun is not self.substrateCollector:
            asn1Object = self._createComponent(asn1Spec, tagSet, noValue, **options)
            return substrateFun(asn1Object, substrate, length)

        # All inner fragments are of the same type, treat them as octet string
        substrateFun = self.substrateCollector

        header = null

        while substrate:
            component, substrate = decodeFun(substrate,
                                             self.protoComponent,
                                             substrateFun=substrateFun,
                                             allowEoo=True, **options)
            if component is eoo.endOfOctets:
                break

            header += component

        else:
            raise error.SubstrateUnderrunError(
                'No EOO seen before substrate ends'
            )

        return self._createComponent(asn1Spec, tagSet, header, **options), substrate 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        return null, 0 

def getMibInstrum(self, contextName=null):
        contextName = univ.OctetString(contextName).asOctets()
        if contextName not in self.contextNames:
            debug.logger & debug.flagIns and debug.logger('getMibInstrum: contextName %r not registered' % contextName)
            raise error.PySnmpError(
                'Missing contextName %s' % contextName
                )
        else:
            debug.logger & debug.flagIns and debug.logger('getMibInstrum: contextName %r, mibInstum %r' % (contextName, self.contextNames[contextName]))
            return self.contextNames[contextName] 

def indefLenValueDecoder(self, substrate, asn1Spec,
                             tagSet=None, length=None, state=None,
                             decodeFun=None, substrateFun=None,
                             **options):
        if substrateFun and substrateFun is not self.substrateCollector:
            asn1Object = self._createComponent(asn1Spec, tagSet, noValue, **options)
            return substrateFun(asn1Object, substrate, length)

        # All inner fragments are of the same type, treat them as octet string
        substrateFun = self.substrateCollector

        header = null

        while substrate:
            component, substrate = decodeFun(substrate,
                                             self.protoComponent,
                                             substrateFun=substrateFun,
                                             allowEoo=True, **options)
            if component is eoo.endOfOctets:
                break

            header += component

        else:
            raise error.SubstrateUnderrunError(
                'No EOO seen before substrate ends'
            )

        return self._createComponent(asn1Spec, tagSet, header, **options), substrate 

def __init__(self, snmpEngine, contextEngineId=None):
        snmpEngineId,= snmpEngine.msgAndPduDsp.mibInstrumController.mibBuilder.importSymbols('__SNMP-FRAMEWORK-MIB', 'snmpEngineID')
        if contextEngineId is None:
            # Default to local snmpEngineId
            self.contextEngineId = snmpEngineId.syntax
        else:
            self.contextEngineId = snmpEngineId.syntax.clone(contextEngineId)
        debug.logger & debug.flagIns and debug.logger('SnmpContext: contextEngineId \"%r\"' % (self.contextEngineId,))
        self.contextNames = {
            null: snmpEngine.msgAndPduDsp.mibInstrumController # Default name
            } 

def registerContextName(self, contextName, mibInstrum=None):
        contextName = univ.OctetString(contextName).asOctets()
        if contextName in self.contextNames:
            raise error.PySnmpError(
                'Duplicate contextName %s' % contextName
                )
        debug.logger & debug.flagIns and debug.logger('registerContextName: registered contextName %r, mibInstrum %r' % (contextName, mibInstrum))
        if mibInstrum is None:
            self.contextNames[contextName] = self.contextNames[null]
        else:
            self.contextNames[contextName] = mibInstrum 

def getCmd(self, authData, transportTarget, *varNames, **kwargs):
        if 'lookupNames' not in kwargs:
            kwargs['lookupNames'] = False
        if 'lookupValues' not in kwargs:
            kwargs['lookupValues'] = False
        for x in sync.getCmd(self.snmpEngine, authData, transportTarget,
                             ContextData(kwargs.get('contextEngineId'),
                                         kwargs.get('contextName', null)),
                             *[ (x, self._null) for x in varNames ],
                             **kwargs):
            return x