def long2raw(value, endian, size=None):
r"""
Convert a number (positive and not nul) to a raw string.
If size is given, add nul bytes to fill to size bytes.
>>> long2raw(0x1219, BIG_ENDIAN)
'\x12\x19'
>>> long2raw(0x1219, BIG_ENDIAN, 4) # 32 bits
'\x00\x00\x12\x19'
>>> long2raw(0x1219, LITTLE_ENDIAN, 4) # 32 bits
'\x19\x12\x00\x00'
"""
assert (not size and 0 < value) or (0 <= value)
assert endian in (LITTLE_ENDIAN, BIG_ENDIAN)
text = []
while (value != 0 or text == ""):
byte = value % 256
text.append( chr(byte) )
value >>= 8
if size:
need = max(size - len(text), 0)
else:
need = 0
if need:
if endian is BIG_ENDIAN:
text = chain(repeat("\0", need), reversed(text))
else:
text = chain(text, repeat("\0", need))
else:
if endian is BIG_ENDIAN:
text = reversed(text)
return "".join(text)
def long2raw(value, endian, size=None):
r"""
Convert a number (positive and not nul) to a raw string.
If size is given, add nul bytes to fill to size bytes.
>>> long2raw(0x1219, BIG_ENDIAN)
'\x12\x19'
>>> long2raw(0x1219, BIG_ENDIAN, 4) # 32 bits
'\x00\x00\x12\x19'
>>> long2raw(0x1219, LITTLE_ENDIAN, 4) # 32 bits
'\x19\x12\x00\x00'
"""
assert (not size and 0 < value) or (0 <= value)
assert endian in (LITTLE_ENDIAN, BIG_ENDIAN, MIDDLE_ENDIAN)
text = []
while (value != 0 or text == ""):
byte = value % 256
text.append(chr(byte))
value >>= 8
if size:
need = max(size - len(text), 0)
else:
need = 0
if need:
if endian is LITTLE_ENDIAN:
text = chain(text, repeat("\0", need))
else:
text = chain(repeat("\0", need), reversed(text))
else:
if endian is not LITTLE_ENDIAN:
text = reversed(text)
if endian is MIDDLE_ENDIAN:
text = arrswapmid(text)
return "".join(text)
def str2long(data, endian):
r"""
Convert a raw data (type 'str') into a long integer.
>>> chr(str2long('*', BIG_ENDIAN))
'*'
>>> str2long("\x00\x01\x02\x03", BIG_ENDIAN) == 0x10203
True
>>> str2long("\x2a\x10", LITTLE_ENDIAN) == 0x102a
True
>>> str2long("\xff\x14\x2a\x10", BIG_ENDIAN) == 0xff142a10
True
>>> str2long("\x00\x01\x02\x03", LITTLE_ENDIAN) == 0x3020100
True
>>> str2long("\xff\x14\x2a\x10\xab\x00\xd9\x0e", BIG_ENDIAN) == 0xff142a10ab00d90e
True
>>> str2long("\xff\xff\xff\xff\xff\xff\xff\xff", BIG_ENDIAN) == (2**64-1)
True
"""
assert 1 <= len(data) <= 32 # arbitrary limit: 256 bits
try:
return unpack(_struct_format[endian][len(data)], data)[0]
except KeyError:
pass
assert endian in (BIG_ENDIAN, LITTLE_ENDIAN)
shift = 0
value = 0
if endian is BIG_ENDIAN:
data = reversed(data)
for character in data:
byte = ord(character)
value += (byte << shift)
shift += 8
return value
def str2long(data, endian):
r"""
Convert a raw data (type 'str') into a long integer.
>>> chr(str2long('*', BIG_ENDIAN))
'*'
>>> str2long("\x00\x01\x02\x03", BIG_ENDIAN) == 0x10203
True
>>> str2long("\x2a\x10", LITTLE_ENDIAN) == 0x102a
True
>>> str2long("\xff\x14\x2a\x10", BIG_ENDIAN) == 0xff142a10
True
>>> str2long("\x00\x01\x02\x03", LITTLE_ENDIAN) == 0x3020100
True
>>> str2long("\xff\x14\x2a\x10\xab\x00\xd9\x0e", BIG_ENDIAN) == 0xff142a10ab00d90e
True
>>> str2long("\xff\xff\xff\xff\xff\xff\xff\xff", BIG_ENDIAN) == (2**64-1)
True
"""
assert 1 <= len(data) <= 32 # arbitrary limit: 256 bits
try:
return unpack(_struct_format[endian][len(data)], data)[0]
except KeyError:
pass
assert endian in (BIG_ENDIAN, LITTLE_ENDIAN)
shift = 0
value = 0
if endian is BIG_ENDIAN:
data = reversed(data)
for character in data:
byte = ord(character)
value += (byte << shift)
shift += 8
return value
def _getPath(self):
if not self._parent:
return '/'
names = []
field = self
while field:
names.append(field._name)
field = field._parent
names[-1] = ''
return '/'.join(reversed(names))
def _getPath(self):
if not self._parent:
return '/'
names = []
field = self
while field:
names.append(field._name)
field = field._parent
names[-1] = ''
return '/'.join(reversed(names))
def bin2long(text, endian):
"""
Convert binary number written in a string into an integer.
Skip characters differents than "0" and "1".
>>> bin2long("110", BIG_ENDIAN)
6
>>> bin2long("110", LITTLE_ENDIAN)
3
>>> bin2long("11 00", LITTLE_ENDIAN)
3
"""
assert endian in (LITTLE_ENDIAN, BIG_ENDIAN)
bits = [ (ord(character)-ord("0")) \
for character in text if character in "01" ]
assert len(bits) != 0
if endian is not BIG_ENDIAN:
bits = reversed(bits)
value = 0
for bit in bits:
value *= 2
value += bit
return value
def bin2long(text, endian):
"""
Convert binary number written in a string into an integer.
Skip characters differents than "0" and "1".
>>> bin2long("110", BIG_ENDIAN)
6
>>> bin2long("110", LITTLE_ENDIAN)
3
>>> bin2long("11 00", LITTLE_ENDIAN)
3
"""
assert endian in (LITTLE_ENDIAN, BIG_ENDIAN)
bits = [ (ord(character)-ord("0")) \
for character in text if character in "01" ]
assert len(bits) != 0
if endian is not BIG_ENDIAN:
bits = reversed(bits)
value = 0
for bit in bits:
value *= 2
value += bit
return value