Is it base62 or (non-standard) base64 encoding?

[gavv]

In base62.go:

const encodeStd = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-0123456789."

there are 64 symbols.

UPD: I also noted there is a fork.

[tuxxy]

Yeah, this confused me, so I forked it to be sure. No idea why those are in there. I'll submit it as a PR.

[riptl]

For anyone else stumbling across this: You won't find a working base62 impl in here.

Try https://github.com/eknkc/basex instead, which has perfect support for base62 and other encodings.

[jxskiss]

Here is another high performance implementation https://github.com/jxskiss/base62

[coolaj86]

@jxskiss Your library is encoding things backwards - meaning that it reverses the byte order of the input when producing the output.

So [0, 0, 0, 0, 255, 255, 255, 255] becomes:

// Using the base64-like alphabet ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789

ffffffDAAAAA

// Using the GMP-like alphabet 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz

VVVVVV300000

And I'm not clear that simply reversing the string would be the correct implementation.

[jxskiss]

@coolaj86 Simply reversing the string wouldn't be a correct implementation -_-
The reversing order you see is just an implementation detail, the correctness is tested by large amount of random bytes data.

You may get more details here jxskiss/base62#2 (comment)