90 lines
2.7 KiB
Python
90 lines
2.7 KiB
Python
class ELFFile:
|
|
EI_NIDENT = 16
|
|
|
|
EI_CLASS = 4
|
|
EI_DATA = 5
|
|
EI_VERSION = 6
|
|
EI_OSABI = 7
|
|
EI_ABIVERSION = 8
|
|
|
|
# possible values for EI_CLASS
|
|
ELFCLASSNONE = 0
|
|
ELFCLASS32 = 1
|
|
ELFCLASS64 = 2
|
|
|
|
# possible value for EI_VERSION
|
|
EV_CURRENT = 1
|
|
|
|
# possible values for EI_DATA
|
|
ELFDATANONE = 0
|
|
ELFDATA2LSB = 1
|
|
ELFDATA2MSB = 2
|
|
|
|
def my_assert(self, expectation, result):
|
|
if not expectation == result:
|
|
#print "'%x','%x' %s" % (ord(expectation), ord(result), self.name)
|
|
raise Exception("This does not work as expected")
|
|
|
|
def __init__(self, name, bits = 0):
|
|
self.name = name
|
|
self.bits = bits
|
|
|
|
def open(self):
|
|
self.file = file(self.name, "r")
|
|
self.data = self.file.read(ELFFile.EI_NIDENT+4)
|
|
|
|
self.my_assert(len(self.data), ELFFile.EI_NIDENT+4)
|
|
self.my_assert(self.data[0], chr(0x7f) )
|
|
self.my_assert(self.data[1], 'E')
|
|
self.my_assert(self.data[2], 'L')
|
|
self.my_assert(self.data[3], 'F')
|
|
if self.bits == 0:
|
|
if self.data[ELFFile.EI_CLASS] == chr(ELFFile.ELFCLASS32):
|
|
self.bits = 32
|
|
elif self.data[ELFFile.EI_CLASS] == chr(ELFFile.ELFCLASS64):
|
|
self.bits = 64
|
|
else:
|
|
# Not 32-bit or 64.. lets assert
|
|
raise Exception("ELF but not 32 or 64 bit.")
|
|
elif self.bits == 32:
|
|
self.my_assert(self.data[ELFFile.EI_CLASS], chr(ELFFile.ELFCLASS32))
|
|
elif self.bits == 64:
|
|
self.my_assert(self.data[ELFFile.EI_CLASS], chr(ELFFile.ELFCLASS64))
|
|
else:
|
|
raise Exception("Must specify unknown, 32 or 64 bit size.")
|
|
self.my_assert(self.data[ELFFile.EI_VERSION], chr(ELFFile.EV_CURRENT) )
|
|
|
|
self.sex = self.data[ELFFile.EI_DATA]
|
|
if self.sex == chr(ELFFile.ELFDATANONE):
|
|
raise Exception("self.sex == ELFDATANONE")
|
|
elif self.sex == chr(ELFFile.ELFDATA2LSB):
|
|
self.sex = "<"
|
|
elif self.sex == chr(ELFFile.ELFDATA2MSB):
|
|
self.sex = ">"
|
|
else:
|
|
raise Exception("Unknown self.sex")
|
|
|
|
def osAbi(self):
|
|
return ord(self.data[ELFFile.EI_OSABI])
|
|
|
|
def abiVersion(self):
|
|
return ord(self.data[ELFFile.EI_ABIVERSION])
|
|
|
|
def abiSize(self):
|
|
return self.bits
|
|
|
|
def isLittleEndian(self):
|
|
return self.sex == "<"
|
|
|
|
def isBigEngian(self):
|
|
return self.sex == ">"
|
|
|
|
def machine(self):
|
|
"""
|
|
We know the sex stored in self.sex and we
|
|
know the position
|
|
"""
|
|
import struct
|
|
(a,) = struct.unpack(self.sex+"H", self.data[18:20])
|
|
return a
|