def compile(self, position, fields, bisturi_conf):
slots = Field._compile(self, position, fields, bisturi_conf)
if self.aligned_to is None:
self.aligned_to = bisturi_conf.get('align', 1)
# XXX we are propagating the 'align' attribute (in bisturi_conf) to
# the prototype packet. This is valid ...but inelegant
# This happen in others fields like Optional and Ref
self.seq_elem_field_name = "_seq_elem__"+self.field_name
self.prototype_field.field_name = self.seq_elem_field_name
self.prototype_field.compile(position=-1, fields=[], bisturi_conf=bisturi_conf)
count, until, when = self.tmp
if isinstance(count, (UnaryExpr, BinaryExpr)):
count = compile_expr_into_callable(count)
#if isinstance(until, (UnaryExpr, BinaryExpr)):
# until = compile_expr_into_callable(until)
if isinstance(when, (UnaryExpr, BinaryExpr)):
when = compile_expr_into_callable(when)
self.resolved_count = None if count is None else _get_count(count)
self.when = _get_when(self.resolved_count, when)
self.until_condition = _get_until(self.resolved_count, until)
return slots + [self.seq_elem_field_name]
def compile(self, position, fields, bisturi_conf):
slots = Field._compile(self, position, fields, bisturi_conf)
self.opt_elem_field_name = "_opt_elem__"+self.field_name
self.prototype_field.field_name = self.opt_elem_field_name
self.prototype_field.compile(position=-1, fields=[], bisturi_conf=bisturi_conf)
when = self.tmp
del self.tmp
if isinstance(when, (UnaryExpr, BinaryExpr)):
when = compile_expr_into_callable(when)
self.when = _get_when(None, when)
return slots + [self.opt_elem_field_name]
def compile(self, position, fields, bisturi_conf):
slots = Field._compile(self, position, fields, bisturi_conf)
if self.byte_count is not None:
if isinstance(self.byte_count, (int, long)):
self.struct_code = "%is" % self.byte_count
self.unpack = self._unpack_fixed_size
elif isinstance(self.byte_count, Field):
self.unpack = self._unpack_variable_size_field
elif callable(self.byte_count):
self.unpack = self._unpack_variable_size_callable
elif isinstance(self.byte_count, (UnaryExpr, BinaryExpr)):
self.byte_count = compile_expr_into_callable(self.byte_count)
self.unpack = self._unpack_variable_size_callable
else:
assert False
else:
self._search_buffer_length = bisturi_conf.get('search_buffer_length')
if self._search_buffer_length is not None:
assert self._search_buffer_length >= 0 # the length can be 0 or None (means infinite) or a positive number
if isinstance(self.until_marker, basestring):
self.unpack = self._unpack_with_string_marker
elif hasattr(self.until_marker, 'search'):
self.unpack = self._unpack_with_regexp_marker
else:
assert False
return slots
