json: Reject invalid \uXXXX, fix \u0000
The JSON parser translates invalid \uXXXX to garbage instead of rejecting it, and swallows \u0000. Fix by using mod_utf8_encode() instead of flawed wchar_to_utf8(). Valid surrogate pairs are now differently broken: they're rejected instead of translated to garbage. The next commit will fix them. Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Message-Id: <20180823164025.12553-29-armbru@redhat.com>
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