tree 9bfde3b23e2bee8e4d97ce69bf00344f98026222
parent 96dcc8ad6ef67f8703efd239f081ed27c7f039a2
author suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp> 1505285355 +0900
committer suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp> 1505285355 +0900

[cache] Fix a possible overflow by signed integer comparison.

Improve the code by 5d3ff05615dda6d1325ed612381a17a0df04c975 ,
issues are found by Behdad Esfahbod and Werner Lemberg.

* src/cache/ftcbasic.c (FTC_ImageCache_Lookup): Replace
a subtraction to check higher bit by a bit operation,
and cpp-conditionalize for appropriate systems.  Add better
documentation to the comment.
(FTC_ImageCache_LookupScaler): Ditto.
(FTC_SBitCache_Lookup): Ditto.
(FTC_SBitCache_LookupScaler): Ditto.