Misc

misc

# Miscellaneous snippets
# Author: op

### BASH * remove spaces in binary string, then convert it to hex, and add 0x format for every 2 hex chars. 
### output sent to xxd for hex to ascii conversion
echo "obase=16; ibase=2; `./.trash/bin | sed 's/ //g'` " | bc | sed 's/../0x\0/g' | xxd -r

### GDB * Only disassemble MAIN section of binary using gdb
gdb -batch -ex 'set disassembly-flavor intel' -ex 'file /home/leviathan2/printfile' -ex 'disassemble main'

########################## Python ################################

 """
 # get largest palindrome number from 3digit * 3digit
 numlist = []
 for i in xrange(100,999):
    for o in xrange(100,999):
        num = str(i*o)
        if num == num[::-1]:
            numlist.append(int(num))
 print max(numlist)
 
 # the loops above can be shortened using list comprehension like:
 numlist = [i*o for i in xrange(100,999) for o in xrange(100,999) if str(i*o) == str(i*o)[::-1]]
 print max(numlist)
 """


### import binascii as bin, hexlify takes ascii input and spit out hex equivalent value.
### unhexlify takes hex value and spit out ascii equivalent representation if available.
bin.hexlify('a')
='61'
bin.unhexlify('61')
='a'

### convert ascii to binary 8 digit long, zfill(zero fill leading zeros)
bin(int(binascii.hexlify('a'), 16)).zfill(8)[2:]

### convert hex string(data), 2 hex digit at a time to ascii string, then join them together.
''.join(chr(int(data[i:i+2], 16)) for i in xrange(0, len(data), 2))

### reverse hex string. e.g. little endian
''.join(reversed([data[i:i+2] for i in xrange(0, len(data), 2)]))

### This prints out 00, 01, 02, 03, ..., 10
for i in xrange(1,11):
    print('{0:02}'.format(i))

### To print 0000, 0001, 0002, 0003, ..., 9999
for i in xrange(10000):
   print('{0:04}'.format(i))
  
### Time your python script. This default_timer will use the default timer function in python library on Windows/Linux
from timeit import default_timer as timer

start = timer()
# do something
end = timer()
print(end - start) 

### More simple timer
import time
start = time.time()
# do something
end = time.time()
print('{} seconds'.format(end - start))