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pattern.py
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pattern.py
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#!/usr/bin/env python2
import sys
import struct
def print_help():
print 'Usage: %s (create | offset) <value> <buflen>' % sys.argv[0]
def pattern_create(length = 8192):
pattern = ''
parts = ['A', 'a', '0']
try:
if not isinstance(length, (int, long)) and length.startswith('0x'):
length = int(length, 16)
elif not isinstance(length, (int, long)):
length = int(length, 10)
except ValueError:
print_help()
sys.exit(254)
while len(pattern) != length:
pattern += parts[len(pattern) % 3]
if len(pattern) % 3 == 0:
parts[2] = chr(ord(parts[2]) + 1)
if parts[2] > '9':
parts[2] = '0'
parts[1] = chr(ord(parts[1]) + 1)
if parts[1] > 'z':
parts[1] = 'a'
parts[0] = chr(ord(parts[0]) + 1)
if parts[0] > 'Z':
parts[0] = 'A'
return pattern
def pattern_offset(value, length = 8192):
try:
if value.startswith('0x'):
value = struct.pack('<I', int(value, 16)).strip('\x00')
except ValueError:
print_help()
sys.exit(254)
pattern = pattern_create(length)
try:
return pattern.index(value)
except ValueError:
return 'Not found'
def main():
if len(sys.argv) < 3 or sys.argv[1].lower() not in ['create', 'offset']:
print_help()
sys.exit(255)
command = sys.argv[1].lower()
num_value = sys.argv[2]
if command == 'create':
print pattern_create(num_value)
elif len(sys.argv) == 4:
print pattern_offset(num_value, sys.argv[3])
if __name__ == '__main__':
main()