elftools/common/py3compat.py

   1 #-------------------------------------------------------------------------------
   2 # elftools: common/py3compat.py
   3 #
   4 # Python 2/3 compatibility code
   5 #
   6 # Eli Bendersky (eliben@gmail.com)
   7 # This code is in the public domain
   8 #-------------------------------------------------------------------------------
   9 import sys
  10 PY3 = sys.version_info[0] == 3
  11 assert PY3, '''\
  12 Python 2 is no longer supported by pyelftools; if you need to use Python 2,
  13 please download an older pyelftools version (such as version 0.29).
  14 '''
  15
  16
  17 if PY3:
  18     import io
  19     from pathlib import Path
  20
  21     StringIO = io.StringIO
  22     BytesIO = io.BytesIO
  23
  24     # Functions for acting on bytestrings and strings. In Python 2 and 3,
  25     # strings and bytes are the same and chr/ord can be used to convert between
  26     # numeric byte values and their string representations. In Python 3, bytes
  27     # and strings are different types and bytes hold numeric values when
  28     # iterated over.
  29
  30
  31     def bytes2str(b): return b.decode('latin-1')
  32     def str2bytes(s): return s.encode('latin-1')
  33     def int2byte(i): return bytes((i,))
  34     def byte2int(b): return b
  35
  36     maxint = sys.maxsize
  37
  38     def path_to_posix(s):
  39         return Path(s).as_posix()
  40
  41 else:
  42     import cStringIO
  43     import os
  44     import posixpath
  45
  46     StringIO = BytesIO = cStringIO.StringIO
  47
  48     def bytes2str(b): return b
  49     def str2bytes(s): return s
  50     int2byte = chr
  51     byte2int = ord
  52     def iterbytes(b):
  53         return iter(b)
  54
  55     maxint = sys.maxint
  56
  57     def path_to_posix(s):
  58         return posixpath.join(*os.path.split(s))