def _build(self, obj, stream, context, path):
if not isinstance(obj, integertypes):
raise IntegerError("value is not an integer", path=path)
if obj < 0:
raise IntegerError("cannot build from negative number: %r" %
(obj, ),
path=path)
if obj > 0xFFFF:
raise IntegerError(
"cannot build from number above short range: %r" % (obj, ),
path=path)
x = obj
if (x > 0x3FFF):
x |= 0xFF0000
nbytes = 3
elif (x > 0x7F):
x |= 0x8000
nbytes = 2
else:
nbytes = 1
for i in range(nbytes, 0, -1):
stream_write(stream, int2byte((x >> (8 * (i - 1))) & 0xFF), 1,
path)
return obj
def _parse(self, stream, context, path):
length = self.length
if callable(length):
length = length(context)
if length < 0:
raise IntegerError("length must be non-negative")
data = stream_read(stream, length, "WhateverPath")
if self.swapped:
if length & 7:
raise IntegerError(
"little-endianness is only defined for multiples of 8 bits"
)
data = swapbytes(data)
data = data[::-1]
return bits2integer(data, self.signed)
def _build(self, obj, stream, context, path):
if not isinstance(obj, integertypes):
raise IntegerError("value is not an integer")
if obj < 0:
raise IntegerError(
"asn1length cannot build from negative number: %r" % (obj, ))
num = obj
if num < 0x80:
stream_write(stream, int2byte(num), 1)
else:
acc = b""
while num != 0:
acc += int2byte(num & 0xFF)
num >>= 8
stream_write(stream, int2byte(0x80 | len(acc)), 1)
stream_write(stream, swapbytes(acc))
return obj
def _build(self, obj, stream, context, path):
if not isinstance(obj, integertypes):
raise IntegerError("value is not an integer", path=path)
if obj < 0:
raise IntegerError("cannot build from negative number: %r" %
(obj, ),
path=path)
if obj > 0xFFFFFFFFFFFFFFFF:
raise IntegerError(
"cannot build from number above short range: %r" % (obj, ),
path=path)
low = obj & 0xFFFFFFFF
IdaVarInt32._build(low, stream, context, path)
high = obj >> 32
IdaVarInt32._build(high, stream, context, path)
return obj
def _build(self, obj, stream, context, path):
if not isinstance(obj, integertypes):
raise IntegerError("value %r is not an integer" % (obj,))
if obj < 0 and not self.signed:
raise IntegerError("value %r is negative, but field is not signed" % (obj,))
length = self.length
if callable(length):
length = length(context)
if length < 0:
raise IntegerError("length must be non-negative")
data = integer2bits(obj, length)
if self.swapped:
if length & 7:
raise IntegerError(
"little-endianness is only defined for multiples of 8 bits"
)
data = swapbytes(data)
data = data[::-1]
stream_write(stream, data, length, path)
return obj
def _build(self, obj, stream, context, path):
if not isinstance(obj, integertypes):
raise IntegerError("Value is not an integer")
to_write = obj
for i in range(5):
byte = 0
length = self.lengths[i]
if i == 0:
negative = obj < 0
byte |= self.negative_bit * negative
if negative:
to_write *= -1
mask = self._get_data_mask(length)
byte |= to_write & mask
to_write >>= length
more_bit = (to_write > 0) and self._get_more_bit(length)
byte |= more_bit
byte &= 0xFF
stream_write(stream, int2byte(byte), 1, path)
if not more_bit:
break
return obj