SCons.compat._scons_hashlib

Package SCons :: Package compat :: Module _scons_hashlib |
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# Source Code for Module SCons.compat._scons_hashlib

     1  #
     2  # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 The SCons Foundation
     3  #
     4  # Permission is hereby granted, free of charge, to any person obtaining
     5  # a copy of this software and associated documentation files (the
     6  # "Software"), to deal in the Software without restriction, including
     7  # without limitation the rights to use, copy, modify, merge, publish,
     8  # distribute, sublicense, and/or sell copies of the Software, and to
     9  # permit persons to whom the Software is furnished to do so, subject to
    10  # the following conditions:
    11  #
    12  # The above copyright notice and this permission notice shall be included
    13  # in all copies or substantial portions of the Software.
    14  #
    15  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
    16  # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
    17  # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    18  # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
    19  # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    20  # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
    21  # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    22  #
    23
    24  __doc__ = """
    25  hashlib backwards-compatibility module for older (pre-2.5) Python versions
    26
    27  This does not not NOT (repeat, *NOT*) provide complete hashlib
    28  functionality.  It only wraps the portions of MD5 functionality used
    29  by SCons, in an interface that looks like hashlib (or enough for our
    30  purposes, anyway).  In fact, this module will raise an ImportError if
    31  the underlying md5 module isn't available.
    32  """
    33
    34  __revision__ = "src/engine/SCons/compat/_scons_hashlib.py 2725 2008/03/31 12:52:02 knight"
    35
    36  import md5
    37  import string
    38
    39 -class md5obj:
    40
    41      md5_module = md5
    42
    43 -    def __init__(self, name, string=''):
    44          if not name in ('MD5', 'md5'):
    45              raise ValueError, "unsupported hash type"
    46          self.name = 'md5'
    47          self.m = self.md5_module.md5()
    48
    49 -    def __repr__(self):
    50          return '<%s HASH object @ %#x>' % (self.name, id(self))
    51
    52 -    def copy(self):
    53          import copy
    54          result = copy.copy(self)
    55          result.m = self.m.copy()
    56          return result
    57
    58 -    def digest(self):
    59          return self.m.digest()
    60
    61 -    def update(self, arg):
    62          return self.m.update(arg)
    63
    64      if hasattr(md5.md5(), 'hexdigest'):
    65
    66 -        def hexdigest(self):
    67              return self.m.hexdigest()
    68
    69      else:
    70
    71          # Objects created by the underlying md5 module have no native
    72          # hexdigest() method (*cough* 1.5.2 *cough*), so provide an
    73          # equivalent lifted from elsewhere.
    74 -        def hexdigest(self):
    75              h = string.hexdigits
    76              r = ''
    77              for c in self.digest():
    78                  i = ord(c)
    79                  r = r + h[(i >> 4) & 0xF] + h[i & 0xF]
    80              return r
    81
    82  new = md5obj
    83
    84 -def md5(string=''):
    85      return md5obj('md5', string)
    86