Package spoon :: Package ber
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Source Code for Package spoon.ber

  1  # 
  2  # Copyright (C) 2003-2006, Robey Pointer <robey@lag.net> 
  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 KIND, EXPRESS 
 16  # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
 17  # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
 18  # IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 
 19  # CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 20  # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
 21  # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 
 22  # 
 23  """ 
 24  The low level BER based encoding used by spoon to serialize objects.  
 25   
 26  Users of the spoon library will probably not need to use this package  
 27  at all. 
 28  """ 
 29   
 30  from cStringIO import StringIO 
 31   
 32  from common import UNIVERSAL, APPLICATION, CONTEXT, PRIVATE 
 33  from common import BERException 
 34   
 35  from tag import Tag 
 36  from stream import BERStream, encoder, zencoder, decoder, encode_container, decode_container 
 37  from stream import EOF_TYPE, NULL_TYPE, INT_TYPE, BYTES_TYPE, UTF8_TYPE, LIST_TYPE 
 38   
 39   
40 -def encode_stream(fd, *items):
41 """ 42 Encode one or more python objects into a ber stream, written to the 43 given file object. 44 """ 45 b = BERStream(fd) 46 for x in items: 47 b.add(x)
48 49
50 -def decode_stream(fd):
51 """ 52 Decode a ber-encoded python object from a file object and return it. 53 """ 54 return BERStream(fd).next()
55 56
57 -def encode(*items):
58 """ 59 Encode one or more python objects into a ber stream, and return the 60 encoded string. 61 """ 62 s = StringIO() 63 encode_stream(s, *items) 64 return s.getvalue()
65 66
67 -def decode(s):
68 """ 69 Decode a python object from a ber-encoded string and return it. 70 """ 71 return decode_stream(StringIO(s))
72 73 for x in [decode, encode, decode_stream, encode_stream, BERException, Tag, 74 BERStream, encoder, zencoder, 75 decoder, encode_container, decode_container, 76 EOF_TYPE, NULL_TYPE, INT_TYPE, BYTES_TYPE, UTF8_TYPE, LIST_TYPE]: 77 x.__module__ = "spoon.ber" 78 79 __all__ = ["decode", 80 "encode", 81 "decode_stream", 82 "encode_stream", 83 "UNIVERSAL", 84 "APPLICATION", 85 "CONTEXT", 86 "PRIVATE", 87 "BERException", 88 "Tag", 89 "BERStream", 90 "encoder", 91 "zencoder", 92 "decoder", 93 "encode_container", 94 "decode_container", 95 "EOF_TYPE", 96 "NULL_TYPE", 97 "INT_TYPE", 98 "BYTES_TYPE", 99 "UTF8_TYPE", 100 "LIST_TYPE"] 101