def _value(self, offset, amount):
from lobvar import vt_CLOB, vt_NCLOB
"""Return a portion (or all) of the data in the external LOB variable."""
lob_type = self.lob_var.type
# modify the arguments
if offset < 0:
offset = 1
if amount < 0:
amount = self._internal_size()
amount = amount - offset + 1;
if amount <= 0:
amount = 1
buffer = self._internal_read(offset, amount)
if lob_type == vt_CLOB:
#if self.lob_var.environment.fixedWidth:
# length = length * self.lob_var.environment.maxBytesPerCharacter
result = cxString_from_encoded_string(buffer, self.lob_var.environment.encoding)
elif lob_type == vt_NCLOB:
result = buffer.decode(self.lob_var.environment.encoding)
else:
result = bytes(buffer)
return result
def _value(self, offset, amount):
from lobvar import vt_CLOB, vt_NCLOB
"""Return a portion (or all) of the data in the external LOB variable."""
lob_type = self.lob_var.type
# modify the arguments
if offset < 0:
offset = 1
if amount < 0:
amount = self._internal_size()
amount = amount - offset + 1
if amount <= 0:
amount = 1
buffer = self._internal_read(offset, amount)
if lob_type == vt_CLOB:
#if self.lob_var.environment.fixedWidth:
# length = length * self.lob_var.environment.maxBytesPerCharacter
result = cxString_from_encoded_string(
buffer, self.lob_var.environment.encoding)
elif lob_type == vt_NCLOB:
result = buffer.decode(self.lob_var.environment.encoding)
else:
result = bytes(buffer)
return result
def parse(self, c):
if len(c) == 0: # no data received
return False
if DEBUG:
# print(self.__parse_state)
print(repr(c))
if self.__parse_state == ParseState.WAITING_FOR_HEAD:
# reset msg
self.__msg_id = None
self.__checksum = 0
self.__data = b''
if c == bytes(HEAD):
if DEBUG:
print('got head')
self.__checksum += ord(c)
self.__parse_state += 1
return False
if self.__parse_state == ParseState.WAITING_FOR_ID:
if DEBUG:
print('got id ', ord(c))
self.__msg_id = ord(c)
self.__checksum += ord(c)
self.__parse_state += 1
return False
if self.__parse_state == ParseState.WAITING_FOR_LEN:
if DEBUG:
print('got len ', ord(c))
self.__msg_len = ord(c)
self.__checksum += ord(c)
self.__parse_state += 1
return False
if self.__parse_state == ParseState.WAITING_FOR_DATA:
if self.__msg_len > 0:
self.__data += c
self.__checksum += ord(c)
self.__msg_len -= 1
else:
if DEBUG:
print('got complete data')
self.__parse_state = ParseState.CHECKSUM
if self.__parse_state == ParseState.CHECKSUM:
if DEBUG:
print(ord(c), " ", self.__checksum & 0xff)
if ord(c) == self.__checksum & 0xff:
if DEBUG:
print('checksum ok')
self.__new_message = self.__msg_id
self.__parse_state = ParseState.WAITING_FOR_HEAD
return True
else:
if DEBUG:
print('checksum error, message discarded')
self.__parse_state = ParseState.WAITING_FOR_HEAD
return False
def encode(self, msg_id, msg):
''' encodes a message
returns a bytes str ready to send
@param msg_id: message id
@param msg: a message object
---
@return b_msg: bytes str
'''
head = bytes(HEAD)
msg_id = bytes(msg_id)
data = msg.pack()
msg_len = bytes(len(data))
lb_msg = head + msg_id + msg_len + data
checksum = 0
for i in range(len(lb_msg)):
checksum += int(lb_msg[i])
checksum = checksum & 0xff
b_msg = lb_msg + bytes(checksum)
return b_msg
def get_value(self, var, pos):
base_ptr_address = ctypes.addressof(var.data) + var.bufferSize * pos
c_length = oci.ub4.from_address(base_ptr_address)
length = c_length.value
start_address = var.bufferSize * pos + ctypes.sizeof(oci.ub4)
the_contents = var.data[start_address: start_address + length]
if var.type == vt_LongBinary:
return bytes(the_contents)
return cxString_from_encoded_string(the_contents, var.environment.encoding)
def get_value(self, var, pos):
base_ptr_address = ctypes.addressof(var.data) + var.bufferSize * pos
c_length = oci.ub4.from_address(base_ptr_address)
length = c_length.value
start_address = var.bufferSize * pos + ctypes.sizeof(oci.ub4)
the_contents = var.data[start_address:start_address + length]
if var.type == vt_LongBinary:
return bytes(the_contents)
return cxString_from_encoded_string(the_contents,
var.environment.encoding)