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