This allows for on-the-fly encoding/decoding, and also allows for
on-the-fly transcoding between types without needing intermediate string
allocations (see added test cases for examples).
- Add {to,from}_{base64,base32z,hex}_size functions to calculate the
resulting output size from a given input size.
- Use it internally
- Make b32z and b64 validity checking slightly stricter: currently we
"accept" some b32z and b64 strings that contain an extra character
that leave us with 5-7 trailing bits (base32z) or 6 trailing bits
(base64). We simply ignore the extra one if decoding, but we
shouldn't accept it in the "is valid" calls.
Changes the 3-iterator versions of to_hex, from_b32z, etc. to return the
final output iterator, which allows for much easier in-place "from"
conversion without needing a new string by doing something like:
std::string data = /* some hex */;
auto end = oxenmq::from_hex(data.begin(), data.end(), data.begin();
data.erase(end, data.end());
Returning from the "to" converters is a bit less useful but doing it
anyway for consistency (and because it could still have some use, e.g.
if output is into some fixed buffer it lets you determine how much was
written).
Jason Rhinelander