tree 60c7205d890a04cbe877edd236c54f72acd3ed42
parent 893b8113f04d408cc6177c6de19c9889a48faa24
author John Bowler <jbowler@acm.org> 1705530545 -0800
committer Cosmin Truta <ctruta@gmail.com> 1705612671 +0200

Regression test for off-by-one palette check error

This adds a file to regression-test the previously introduced off-by-one
error in the check on read for a colormapped PNG with an out-of-range
index (equal or greater than the length of the PLTE).

Previous tests covered all cases except the 8-bit palette case; the
"small" test file contains the "bad" entry at index 254, not 255 so it
passes even if the final byte is not checked.  The new file has the
erroneous entry in the last byte.

Signed-off-by: John Bowler <jbowler@acm.org>