import collections
from enum import IntEnum
import logging
+from .vpp_format import VPPFormat
#
# Set log-level in application by doing e.g.:
logger = logging.getLogger(__name__)
-class BaseTypes():
+class BaseTypes(object):
def __init__(self, type, elements=0):
base_types = {'u8': '>B',
'u16': '>H',
'i32': '>i',
'u64': '>Q',
'f64': '>d',
+ 'bool': '>?',
'header': '>HI'}
if elements > 0 and type == 'u8':
.format(type, base_types[type]))
def pack(self, data, kwargs=None):
+ if not data: # Default to zero if not specified
+ data = 0
return self.packer.pack(data)
def unpack(self, data, offset, result=None):
types['i32'] = BaseTypes('i32')
types['u64'] = BaseTypes('u64')
types['f64'] = BaseTypes('f64')
+types['bool'] = BaseTypes('bool')
-class FixedList_u8():
+def vpp_get_type(name):
+ try:
+ return types[name]
+ except KeyError:
+ return None
+
+
+class FixedList_u8(object):
def __init__(self, name, field_type, num):
self.name = name
self.num = num
def pack(self, list, kwargs):
"""Packs a fixed length bytestring. Left-pads with zeros
if input data is too short."""
+ if not list:
+ return b'\x00' * self.size
if len(list) > self.num:
raise ValueError('Fixed list length error for "{}", got: {}'
' expected: {}'
return self.packer.unpack(data, offset)
-class FixedList():
+class FixedList(object):
def __init__(self, name, field_type, num):
self.num = num
self.packer = types[field_type]
return result, total
-class VLAList():
+class VLAList(object):
def __init__(self, name, field_type, len_field_name, index):
self.name = name
self.index = index
self.length_field = len_field_name
def pack(self, list, kwargs=None):
+ if not list:
+ return b""
if len(list) != kwargs[self.length_field]:
raise ValueError('Variable length error, got: {} expected: {}'
.format(len(list), kwargs[self.length_field]))
return r, total
-class VPPEnumType():
+class VPPEnumType(object):
def __init__(self, name, msgdef):
self.size = types['u32'].size
e_hash = {}
def __getattr__(self, name):
return self.enum[name]
+ def __nonzero__(self):
+ return True
+
def pack(self, data, kwargs=None):
- return types['u32'].pack(data, kwargs)
+ return types['u32'].pack(data)
def unpack(self, data, offset=0, result=None):
x, size = types['u32'].unpack(data, offset)
return self.enum(x), size
-class VPPUnionType():
+class VPPUnionType(object):
def __init__(self, name, msgdef):
self.name = name
self.size = 0
self.tuple = collections.namedtuple(name, fields, rename=True)
logger.debug('Adding union {}'.format(name))
+ # Union of variable length?
def pack(self, data, kwargs=None):
+ if not data:
+ return b'\x00' * self.size
+
for k, v in data.items():
logger.debug("Key: {} Value: {}".format(k, v))
b = self.packers[k].pack(v, kwargs)
return self.tuple._make(r), maxsize
-class VPPType():
+class VPPType(object):
# Set everything up to be able to pack / unpack
def __init__(self, name, msgdef):
self.name = name
kwargs = data
b = bytes()
for i, a in enumerate(self.fields):
- if a not in data:
- b += b'\x00' * self.packers[i].size
- continue
+
+ # Try one of the format functions
+ if data and type(data) is not dict and a not in data:
+ raise ValueError("Invalid argument: {} expected {}.{}".
+ format(data, self.name, a))
+
+ # Defaulting to zero.
+ if not data or a not in data: # Default to 0
+ arg = None
+ kwarg = None # No default for VLA
+ else:
+ arg = data[a]
+ kwarg = kwargs[a] if a in kwargs else None
if isinstance(self.packers[i], VPPType):
- b += self.packers[i].pack(data[a], kwargs[a])
+ try:
+ b += self.packers[i].pack(arg, kwarg)
+ except ValueError:
+ # Invalid argument, can we convert it?
+ arg = VPPFormat.format(self.packers[i].name, data[a])
+ data[a] = arg
+ kwarg = arg
+ b += self.packers[i].pack(arg, kwarg)
else:
- b += self.packers[i].pack(data[a], kwargs)
+ b += self.packers[i].pack(arg, kwargs)
+
return b
def unpack(self, data, offset=0, result=None):