X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=base91.py;h=f407d44c44db856250c53cd5489837ea84e1a602;hb=564022994befb8f71b89ae015751b22c34ae3ee8;hp=cd279bc18faba3ca9754795ec06b95c65188ede5;hpb=a7803a7906e7ed0035d0779ff781c172348bdac1;p=secnet.git

diff --git a/base91.py b/base91.py
deleted file mode 100644
index cd279bc..0000000
--- a/base91.py
+++ /dev/null
@@ -1,92 +0,0 @@
-# Base91 encode/decode for Python 2 and Python 3
-#
-# Copyright (c) 2012 Adrien Beraud
-# Copyright (c) 2015 Guillaume Jacquenot
-# All rights reserved.
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are met:
-#
-#   * Redistributions of source code must retain the above copyright notice,
-#     this list of conditions and the following disclaimer.
-#   * Redistributions in binary form must reproduce the above copyright notice,
-#     this list of conditions and the following disclaimer in the documentation
-#     and/or other materials provided with the distribution.
-#   * Neither the name of Adrien Beraud, Wisdom Vibes Pte. Ltd., nor the names
-#     of its contributors may be used to endorse or promote products derived
-#     from this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
-# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#
-import struct
-
-base91_alphabet = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
-	'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
-	'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
-	'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
-	'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '!', '#', '$',
-	'%', '&', '(', ')', '*', '+', ',', '.', '/', ':', ';', '<', '=',
-	'>', '?', '@', '[', ']', '^', '_', '`', '{', '|', '}', '~', '"']
-
-decode_table = dict((v,k) for k,v in enumerate(base91_alphabet))
-
-def decode(encoded_str):
-    ''' Decode Base91 string to a bytearray '''
-    v = -1
-    b = 0
-    n = 0
-    out = bytearray()
-    for strletter in encoded_str:
-        if not strletter in decode_table:
-            continue
-        c = decode_table[strletter]
-        if(v < 0):
-            v = c
-        else:
-            v += c*91
-            b |= v << n
-            n += 13 if (v & 8191)>88 else 14
-            while True:
-                out += struct.pack('B', b&255)
-                b >>= 8
-                n -= 8
-                if not n>7:
-                    break
-            v = -1
-    if v+1:
-        out += struct.pack('B', (b | v << n) & 255 )
-    return out
-
-def encode(bindata):
-    ''' Encode a bytearray to a Base91 string '''
-    b = 0
-    n = 0
-    out = ''
-    for count in range(len(bindata)):
-        byte = bindata[count:count+1]
-        b |= struct.unpack('B', byte)[0] << n
-        n += 8
-        if n>13:
-            v = b & 8191
-            if v > 88:
-                b >>= 13
-                n -= 13
-            else:
-                v = b & 16383
-                b >>= 14
-                n -= 14
-            out += base91_alphabet[v % 91] + base91_alphabet[v // 91]
-    if n:
-        out += base91_alphabet[b % 91]
-        if n>7 or b>90:
-            out += base91_alphabet[b // 91]
-    return out
diff --git a/base91.py b/base91.py
new file mode 120000
index 0000000..f407d44
--- /dev/null
+++ b/base91.py
@@ -0,0 +1 @@
+base91-python/base91/__init__.py
\ No newline at end of file