tree 5e0f1b11752445867246dd413789dccad9311055
parent 78f02a161f6b7afe67d2b6a0d36f89b5b036fbb7
author Joe Tsai <joetsai@digital-static.net> 1540501616 -0700
committer Joe Tsai <thebrokentoaster@gmail.com> 1540583721 +0000

internal/impl: support legacy unknown fields

Add wrapper data structures to get legacy XXX_unrecognized fields to support
the new protoreflect.UnknownFields interface. This is a challenge since the
field is a []byte, which does not give us much flexibility to work with
in terms of choice of data structures.

This implementation is relatively naive where every operation is O(n) since
it needs to strip through the entire []byte each time. The Range operation
operates slightly differently from ranging over Go maps since it presents a
stale version of RawFields should a mutation occur while ranging.
This distinction is unlikely to affect anyone in practice.

Change-Id: Ib3247cb827f9a0dd6c2192cd59830dca5eef8257
Reviewed-on: https://go-review.googlesource.com/c/144697
Reviewed-by: Damien Neil <dneil@google.com>