The legacy png files have an empty line in the end. And the recovery
used to match any missing locale, e.g. "he" with that line and gets an
empty image.
Since the empty image is barely useful, we should just error out and
fall back to the default locale.
This reversed the unit test check added in d17a688525
Bug: 128934634
Test: run locale test with "he" and legacy images, recovery reports
error and doesn't crash even without default locale fall back
Change-Id: Ibdb7dd0b42348de5e392c834cce67ff02be85c24
Switch the locale header in the png files from Locale.toString() to
Locale.toLanguageTag(). For example, en_US --> en-us and sr__#Latn
--> sr-Latn. Also clean up recovery a bit to expect the new locale
format.
Bug: 35215015
Test: sr-Latn shows correctly under graphic tests && recovery tests pass
Change-Id: Ic62bab7756cdc6e5f98f26076f7c2dd046f811db
match_locale() will return false for empty locale string in the PNG
file. Also add a manual test to validate if a PNG file is qualified to
use under recovery.
Bug: 34054052
Test: recovery_manual_test catches invalid PNG files successfully & Locale_test passed
Change-Id: Id7e2136e1d8abf20da15825aa7901effbced8b03
matches_locale was expecting input locale string to have at most one
underscore; as a result "zh_CN_#Hans" ignores "zh_CN" and matches into
"zh". Fix the match function and add unit tests.
Bug: 27837319
Change-Id: I4e8a66f91cae6ac2a46b6bf21f670d5ea564c7c8
