D634: encoding: check overflow while calculating size of JSON escape buffer

[singhsrb (Saurabh Singh)]

singhsrb abandoned this revision.
singhsrb added a comment.


  Added for review by mistake.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D634

To: singhsrb, #hg-reviewers
Cc: mercurial-devel