Rewrote serializer type length

This commit is contained in:
2019-03-19 14:10:14 +01:00
parent 12ea8c4d1b
commit ba738e395d
2 changed files with 41 additions and 42 deletions

View File

@@ -15,7 +15,7 @@ TYPE_FLOAT = b"f", 4
TYPE_DOUBLE = b"d", 8
TYPE_STRING = b"s", 1
TYPE_ULEB = 1 # Just so we have the enum type~ish
TYPE_ULEB = b"s", 1, True # True just so they are different tuples
BYTEORDER_NATIVE = b"@"
BYTEORDER_LITTLE = b"<"
@@ -80,11 +80,11 @@ def read(value_type, stream):
struct.unpack(value_type[0], stream[:value_type[1]])
class Serializable:
length = None
prefix = b""
pre_serialized = None
length = None
prefix = b""
filter = None
def __init__(self, value, type = None, length = None, prefix = b"", pre = None):
def __init__(self, value, type = None, length = None, prefix = b"", filter = None):
self.value = value
if type is not None:
@@ -94,34 +94,44 @@ class Serializable:
self.length = length
self.prefix = prefix
self.pre_serialized = pre
self.filter = filter
def get_struct_fmt(self):
def get_struct_fmt(self, length = 1):
struct_fmt = self.type[0]
if length > 1:
struct_fmt = b"%d%b" % (length, self.type[0])
if self.length is not None:
return b"%d%b" % (self.length.value, self.type[0])
return self.type[0]
if self.length == TYPE_ULEB:
val = self.get_value()
struct_fmt = b"%d%b%b" % (len(val[0]), self.length[0], struct_fmt)
else:
struct_fmt = b"%b%b" % (self.length[0], struct_fmt)
return struct_fmt
def get_value(self):
val = self.value
if self.pre_serialized is not None:
val[-1] = self.pre_serialized(val[-1])
val = [self.value]
if self.filter is not None:
val[-1] = self.filter(val[-1])
if self.length is not None:
if self.length == TYPE_ULEB:
val.insert(0, encode_uleb(len(val[-1])))
else:
val.insert(0, len(val[-1]))
return val
def pack(self, byte_order = BYTEORDER_LITTLE):
if self.type == TYPE_ULEB:
return encode_uleb(self.value)
struct_fmt = byte_order + self.get_struct_fmt()
packed = struct.pack(struct_fmt, self.get_value())
length = 1
if self.type == TYPE_STRING:
length = len(self.get_value()[-1])
struct_fmt = byte_order + self.get_struct_fmt(length)
packed = struct.pack(struct_fmt, *self.get_value())
if self.prefix is not None:
packed = self.prefix + packed
return packed
def unpack(self, length = -1, byte_order = BYTEORDER_LITTLE):
if self.type == TYPE_ULEB:
self.value = decode_uleb(2)
return
if self.type == TYPE_STRING:
length =
length = len(self.value)
struct_fmt = byte_order + self.get_struct_fmt(length)
class Serializer: