问题描述
我有一个字节数组（任意长度），我想使用我自己的基编码器把这个数组编码成字符串。在 .NET 是标准的 Base64 编码器，但如果我想在 Base62 ， Base53 或 Base13 ？ 甚至可以创建这样的通用基编码器？
我知道我可以用简单的方法来做，也就是说，对于每个字节的保留固定数量chars（在 Base62 的情况下，这将是5个字符），并执行直接的byte-> chars编码，但我会浪费空间，作为5 Base62 chars可以包含超过1个字节，但不超过2个字节。
我该如何编写这样的编码器？还是有一些类吗？
请注意，我还需要通用解码器，否则这对我来说是无用的。
资源
由于解决方案已知（使用 BigInteger ），我只想在这里放置一些与 BigInteger class，因为它在.NET 3.5中不可用：
如果性能不是问题，请使用 BigInteger 类。你有一个BigInteger的构造函数，它使用字节数组，然后可以手动运行除法和模数循环，以获得其他非标准基础的表示。
看看。
I have an array of bytes (any length), and I want to encode this array into string using my own base encoder. In .NET is standard Base64 encoder, but what if I want to encode the array in Base62, Base53 or Base13?
Is it even possible to create such universal base encoder?
I know I could do it the simple way, that is, for each byte reserve fixed number of chars (in case of Base62, that would be 5 chars), and do direct byte->chars encoding, but I would be wasting space, as 5 Base62 chars are able to contain more than 1 byte, but less than 2 bytes.
How should I write such an encoder? Or is there already some class for this?
And please note that I need universal decoder as well, otherwise this is useless to me.
Resources
As the solution is already known (use BigInteger), I would just like to put here some resources relating the BigInteger class, as it is not available in .NET 3.5:
Big integers in C#
http://intx.codeplex.com/
https://svn.apache.org/repos/asf/incubator/heraldry/libraries/csharp/openid/trunk/Mono/Mono.Math/BigInteger.cs
http://www.codeproject.com/KB/cs/BigInteger_Library.aspx
http://www.codeproject.com/KB/cs/biginteger.aspx
If performance is not an issue, use the BigInteger class in the background. You have a constructor for BigInteger that takes byte array, and you can then manually run loops of division and modulus to get the representation in other non-standard bases.
Also take a look at this.
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