<p>现在有点晚了,但我想我应该把帽子扔进戒指里:</p>
<pre><code>def inttob64(n):
"""
Given an integer returns the base64 encoded version of it (no trailing ==)
"""
parts = []
while n:
parts.insert(0,n & limit)
n >>= 32
data = struct.pack('>' + 'L'*len(parts),*parts)
s = base64.urlsafe_b64encode(data).rstrip('=')
return s
def b64toint(s):
"""
Given a string with a base64 encoded value, return the integer representation
of it
"""
data = base64.urlsafe_b64decode(s + '==')
n = 0
while data:
n <<= 32
(toor,) = struct.unpack('>L',data[:4])
n |= toor & 0xffffffff
data = data[4:]
return n
</code></pre>
<p>这些函数将任意大小的长数字转换为/从大端base64表示。</p>