def unpack_dataruns(str):
dataruns = []
numruns = 0
pos = 0
prevoffset = 0
error = ''
c_uint8 = ctypes.c_uint8
class Length_bits(ctypes.LittleEndianStructure):
_fields_ = [
("lenlen", c_uint8, 4),
("offlen", c_uint8, 4),
]
class Lengths(ctypes.Union):
_fields_ = [("b", Length_bits), ("asbyte", c_uint8)]
lengths = Lengths()
#mftutils.hexdump(str,':',16)
while (True):
lengths.asbyte = struct.unpack("B", str[pos])[0]
pos += 1
if lengths.asbyte == 0x00:
break
if (lengths.b.lenlen > 6 or lengths.b.lenlen == 0):
error = "Datarun oddity."
break
len = bitparse.parse_little_endian_signed(str[pos:pos +
lengths.b.lenlen])
# print lengths.b.lenlen, lengths.b.offlen, len
pos += lengths.b.lenlen
if (lengths.b.offlen > 0):
offset = bitparse.parse_little_endian_signed(str[pos:pos +
lengths.b.offlen])
offset = offset + prevoffset
prevoffset = offset
pos += lengths.b.offlen
else: # Sparse
offset = 0
pos += 1
dataruns.append([len, offset])
numruns += 1
# print "Lenlen: %d Offlen: %d Len: %d Offset: %d" % (lengths.b.lenlen, lengths.b.offlen, len, offset)
return numruns, dataruns, error
def unpack_dataruns(str):
dataruns = []
numruns = 0
pos = 0
prevoffset = 0
error = ''
c_uint8 = ctypes.c_uint8
class Length_bits(ctypes.LittleEndianStructure):
_fields_ = [
("lenlen", c_uint8, 4),
("offlen", c_uint8, 4),
]
class Lengths(ctypes.Union):
_fields_ = [("b", Length_bits),
("asbyte", c_uint8)]
lengths = Lengths()
#mftutils.hexdump(str,':',16)
while (True):
lengths.asbyte = struct.unpack("B",str[pos])[0]
pos += 1
if lengths.asbyte == 0x00:
break
if (lengths.b.lenlen > 6 or lengths.b.lenlen == 0):
error = "Datarun oddity."
break
len = bitparse.parse_little_endian_signed(str[pos:pos+lengths.b.lenlen])
# print lengths.b.lenlen, lengths.b.offlen, len
pos += lengths.b.lenlen
if (lengths.b.offlen > 0):
offset = bitparse.parse_little_endian_signed(str[pos:pos+lengths.b.offlen])
offset = offset + prevoffset
prevoffset = offset
pos += lengths.b.offlen
else: # Sparse
offset = 0
pos += 1
dataruns.append([len, offset])
numruns += 1
# print "Lenlen: %d Offlen: %d Len: %d Offset: %d" % (lengths.b.lenlen, lengths.b.offlen, len, offset)
return numruns, dataruns, error