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I need to encode a string of about 1000 characters that can be any byte value (00-FF). I don't want to use Hex because it's not dense enough. the problem with base64 as I understand it is that it includes + / and = which are characters I can not tolerate in my application.
Any suggestions?
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Show activity on this post. Base64 only contains A–Z , a–z , 0–9 , + , / and = . So the list of characters not to be used is: all possible characters minus the ones mentioned above.
You will not have an = sign if your string has a multiple of 3 characters, because Base64 encoding takes each three bytes (a character=1 byte) and represents them as four printable characters in the ASCII standard. Base64 deals with the first block (producing 4 characters) and the second (as they are complete).
The equals sign "=" represents a padding, usually seen at the end of a Base64 encoded sequence. Each group of six bits is encoded using the above conversion.
With padding, a base64 string always has a length that is a multiple of 4 (if it doesn't, the string has been corrupted for sure) and thus code can easily process that string in a loop that processes 4 characters at a time (always converting 4 input characters to three or less output bytes).
Base58Check is an option. It is starting to become something of a de facto standard in cryptocurrency addresses.
Basic improvements over Base64:
[0-9a-zA-Z]
0OIl / 0OIlThe Bitcoin Address Utility is an implementation example; geared for Bitcoins.
Note: A novel de facto standard may not be adequate for your needs. It is unclear if the Base58Check encoding method will formalise across current protocols.
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