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input.py
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input.py
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# =============================================================================
# input.py
#
# author: matthieu.kaczmarek@mines-nancy.fr
# Mainly rewrited from udis86 -- Vivek Mohan <vivek@sig9.com>
# =============================================================================
CACHE_SIZE = 64
class Hook:
def __init__(self, source, base_address):
self.dis_mode = 32
def hook(self):
raise NotImplementedError('abstract method: Hook.hook() should not be called directly')
def seek(self, add):
raise NotImplementedError('abstract method: Hook.seek() should not be called directly')
def symbols(self):
return {}
class BufferHook(Hook):
"""Hook for buffered inputs."""
def __init__(self, source, base_address):
Hook.__init__(self, source, base_address)
self.source = source
self.pos = 0
self.set_source(source)
self.entry_point = self.base_address = base_address
def set_source(self, source):
self.source = source
self.pos = 0
def hook(self):
if self.pos != None and self.pos >= 0 and self.pos < len(self.source):
ret = self.source[self.pos]
self.pos += 1
#print(hex(self.pos) + ' ' + hex(ord(ret)))
return ord(ret)
else:
self.pos = None
def seek(self, add):
pos = add - self.base_address
if pos >= 0 and pos <= len(self.source):
self.pos = pos
else:
self.pos = None
class PEStringHook(BufferHook):
def __init__(self, source, base_address):
BufferHook.__init__(self, source, base_address)
try :
import pefile
except :
print('pefile module not found. see http://code.google.com/p/pefile/')
exit()
self.pe = pefile.PE(data = source)
self.source = self.pe.get_memory_mapped_image()
self.base_address = self.pe.OPTIONAL_HEADER.ImageBase
self.entry_point = (self.base_address
+ self.pe.OPTIONAL_HEADER.AddressOfEntryPoint)
self.pos = 0
self.seek(self.base_address + self.pe.OPTIONAL_HEADER.AddressOfEntryPoint)
if self.pe.PE_TYPE == pefile.OPTIONAL_HEADER_MAGIC_PE:
self.dis_mode = 32
elif self.pe.PE_TYPE == pefile.OPTIONAL_HEADER_MAGIC_PE_PLUS:
self.dis_mode = 64
def seek(self, add):
pos = add - self.base_address
if pos >= 0 and pos <= len(self.source):
self.pos = pos
else:
self.pos = None
def symbols(self):
ret = {}
for entry in self.pe.DIRECTORY_ENTRY_IMPORT:
for imp in entry.imports:
if imp.name:
ret[imp.address] = imp.name
# print(hex(imp.address) + ':' + imp.name)
# commented this out, or else we have unreachable code
# return ret
try:
for exp in self.pe.DIRECTORY_ENTRY_EXPORT.symbols:
key = self.pe.OPTIONAL_HEADER.ImageBase + exp.address
ret[key] = exp.name # exp.ordinal
except:
pass
return ret
class PEFileHook(BufferHook):
def __init__(self, source, base_address):
BufferHook.__init__(self, source, base_address)
try :
import pefile
except :
print('pefile module not found. see http://code.google.com/p/pefile/')
exit()
self.pe = pefile.PE(name = source)
self.source = self.pe.get_memory_mapped_image()
self.pos = self.base_address = base_address
self.base_address = self.pe.OPTIONAL_HEADER.ImageBase
self.entry_point = (self.base_address
+ self.pe.OPTIONAL_HEADER.AddressOfEntryPoint)
self.seek(self.base_address + self.pe.OPTIONAL_HEADER.AddressOfEntryPoint)
class HexstringHook(Hook):
"""Hook for hex string inputs."""
def __init__(self, source, base_address = 0):
Hook.__init__(self, source, base_address)
self.set_source(source)
self.entry_point = self.base_address = base_address
def set_source(self, source):
self.source = source.strip().split(' ')
self.pos = 0
def hook(self):
ret = -1
if self.pos != None and self.pos < len(self.source):
ret = int(self.source[self.pos], 16)
self.pos += 1
return ret
def seek(self, add):
pos = add - self.base_address
if pos >= 0 and pos < len(self.source):
self.pos = pos
else:
self.pos = None
class FileHook(Hook):
"""Hook for FILE inputs."""
def __init__(self, source, base_address):
Hook.__init__(self, source, base_address)
self.source = source
self.entry_point = self.base_address = base_address
def set_source(self, source):
self.source = source
def hook(self):
s = self.source.read(1)
if s == '':
return -1
return s[0]
def seek(self, add):
pos = add - self.base_address
if pos >= 0:
self.source.seek(pos)
else:
self.pos = None
class Input:
def __init__(self, hook, source, base_address = 0):
self.hook = hook(source, base_address)
self.symbols = self.hook.symbols()
self.start ()
def start (self) :
self.ctr = -1
self.fill = -1
self.error = 0
self.buffer = []
def seek(self, add):
self.hook.seek(add)
if self.hook.pos == None :
self.error = 1
def current(self):
if self.ctr >= 0:
return self.buffer[self.ctr]
else:
return -1
def next(self):
if self.error == 1 :
return -1
if self.ctr < self.fill:
self.ctr += 1
return self.current()
c = self.hook.hook()
if c != -1:
self.ctr += 1
self.fill += 1
self.buffer.append(c)
else:
self.error = 1
return c
def back(self):
"""Move back a single byte in the stream."""
if self.ctr >= 0:
self.ctr -= 1
def peek(self):
"""Peek into the next byte in source."""
r = self.next()
# Don't backup if there was an error return r
if not self.error:
self.back()
return int(r)
def read(self, n):
if self.error == 1:
return -1
"""read uint of n bits from source"""
if n < 8:
print('minimal size of addressable memory is 8 bits(' + n +')')
elif n == 8:
return self.next()
else:
n //= 2
a = self.read(n)
b = self.read(n)
return a |(b << n)