Changed parser semantics around skipping.

Prior to this change:

  parse(buf, len) -> len + N

...would indicate that the next N bytes of the input are not
needed, *and* would advance the decoding position by this
much.

After this change:

  parse(buf, len) -> len + N
  parse(NULL, N) -> N

...can be used to achieve the same thing.  But skipping the
N bytes is not explicitly performed by the user.  A user that
doesn't want/need to skip can just say:

  parsed = parse(buf, len);

  if (parsed < len) {
    // Handle suspend, advance stream by "parsed".
  } else {
    // Stream was advanced by "len" (even if parsed > len).
  }

Updated unit tests to test this new behavior, and refactored
test utility code a bit to support it.

0 files changed, 0 insertions, 0 deletions