Quick and dirty script for decompressing a gz stream

zlib-decompress.py

#!/usr/bin/python

import zlib,sys,os

print 'Usage: %s <infile> <offset-addr> <length> <outfile>' % sys.argv[0]

if len(sys.argv) < 5:
    exit(-1)

fr = open(sys.argv[1], 'rb')
offset = int(sys.argv[2])
length = int(sys.argv[3])

if length == 0:
    length = os.path.getsize(sys.argv[1]) - offset

fr.seek(offset)
bytes = fr.read(length)
fr.close()

try:
    uncomprr =zlib.decompress(bytes)
    fw = open(sys.argv[4], 'w')
    fw.write(uncomprr)
    fw.close()
    print "decompressed file segment !"
except zlib.error :
    print 'File segment 0x%x->%s does not contain zlib compressed data' % (offset,length)
    exit(-1)