#!/usr/bin/env python
#
# $Id: elf-hash 2054 2011-10-26 12:12:06Z jkoshy $

import sys, os

def elf_hash(s):
	"""A python implementation of elf_hash(3)."""
	h = 0L
	for c in s:
		h = (h << 4) + ord(c)
		t = (h & 0xF0000000L)
		if t != 0:
			h = h ^ (t >> 24)
		h = h & ~t
	return h


if __name__ == '__main__':
	from optparse import OptionParser

	usage = "usage: %prog [options] files...\n" + \
		"       print ELF hash values for strings or file contents"

	p = OptionParser(usage=usage)
	p.add_option("-s", "--string", dest="hash_strings",
		action="append", metavar="STRING",
		help="compute hash for STRING")

	options, args = p.parse_args()
	if not options.hash_strings and not args:
		p.print_help()
		sys.exit(1)

	if options.hash_strings:
		for s in options.hash_strings:
	 		print "\"%s\" 0x%x" % (s, elf_hash(s))
	for f in args:
		print "[%s] 0x%x" % (f, elf_hash(open(f,'r').read()))