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import os
import sys
import os.path
import random
CHANGE_SIZE = 30
size = os.path.getsize(sys.argv[1])
changes = [0]
for i in range(3):
changes.append(random.randint(0,size-1-CHANGE_SIZE))
changes.sort()
newbuf = b''
with open(sys.argv[1], 'rb') as f:
for i,c in enumerate(changes):
if c == 0: continue
rsize = max(0, c-changes[i-1])
newbuf += f.read(rsize)
for j in range(random.randint(CHANGE_SIZE-5, CHANGE_SIZE+5)):
newbuf += chr(random.randint(60,80))
changes[i] += CHANGE_SIZE
f.seek(CHANGE_SIZE, os.SEEK_CUR)
rsize = max(0, size - changes[-1])
newbuf += f.read(rsize)
with open(sys.argv[1], 'wb') as f:
f.write(newbuf)
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