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#
# Copyright (C) 2011 EADS France, Fabrice Desclaux <fabrice.desclaux@eads.net>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
class bin_stream(object):
def __init__(self, *args, **kargs):
pass
def __repr__(self):
return "<%s !!>" % self.__class__.__name__
def hexdump(self, offset, l):
return
def getbytes(self, start, l=1):
return self.bin[start:start + l]
def getbits(self, start, n):
if not n:
return 0
o = 0
if n > self.getlen() * 8:
raise ValueError('not enought bits %r %r' % (n, len(self.bin) * 8))
while n:
# print 'xxx', n, start
i = start / 8
c = self.getbytes(i)
if not c:
raise IOError
c = ord(c)
# print 'o', hex(c)
r = 8 - start % 8
c &= (1 << r) - 1
# print 'm', hex(c)
l = min(r, n)
# print 'd', r-l
c >>= (r - l)
o <<= l
o |= c
n -= l
start += l
return o
class bin_stream_str(bin_stream):
def __init__(self, bin="", offset=0L, shift=0):
bin_stream.__init__(self)
if offset > len(bin):
raise IOError
self.bin = bin
self.offset = offset
self.shift = shift
self.l = len(bin)
if "is_addr_in" in self.bin.__class__.__dict__:
self.is_addr_in = lambda ad: self.bin.is_addr_in(ad)
def getbytes(self, start, l=1):
if start + l > self.l:
raise IOError
return super(bin_stream_str, self).getbytes(start + self.shift, l)
def readbs(self, l=1):
if self.offset + l > self.l:
raise IOError
self.offset += l
print hex(self.offset + self.shift)
return self.bin[self.offset - l + self.shift:self.offset + self.shift]
def writebs(self, l=1):
raise ValueError('writebs unsupported')
def __str__(self):
out = self.bin[self.offset + self.shift:]
return out
def setoffset(self, val):
self.offset = val
def __len__(self):
return len(self.bin) - self.offset + self.shift
def getlen(self):
return len(self.bin) - self.offset + self.shift
class bin_stream_file(bin_stream):
def __init__(self, bin, offset=0L):
bin_stream.__init__(self)
self.bin = bin
self.bin.seek(0, 2)
self.l = self.bin.tell()
self.offset = offset
def getoffset(self):
return self.bin.tell()
def setoffset(self, val):
self.bin.seek(val)
offset = property(getoffset, setoffset)
def readbs(self, l=1):
if self.offset + l > self.l:
raise IOError
return self.bin.read(l)
def writebs(self, l=1):
if self.offset + l > self.l:
raise IOError
return self.bin.write(l)
def __str__(self):
return str(self.bin)
class bin_stream_pe(bin_stream):
def __init__(self, bin="", offset=0L):
bin_stream.__init__(self)
# print 'ELF/PE'
self.mylen = len(bin)
if offset > bin.__len__():
raise IOError
self.bin = bin
self.offset = offset
self.l = bin.__len__()
if "is_addr_in" in self.bin.__class__.__dict__:
self.is_addr_in = lambda ad: self.bin.is_addr_in(ad)
def getlen(self):
return self.mylen
# s = self.bin.parent.SHList[-1]
# l = self.bin.parent.rva2virt(s.addr+s.size)
# return l
def readbs(self, l=1):
if self.offset + l > self.l:
raise IOError
self.offset += l
return self.bin(self.offset - l, self.offset)
def writebs(self, l=1):
raise ValueError('writebs unsupported')
def getbytes(self, start, l=1):
return self.bin(start, start + l)
def __str__(self):
out = self.bin[self.offset:]
return out
def setoffset(self, val):
self.offset = val
class bin_stream_elf(bin_stream_pe):
pass
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