font/sfnt: support for large kern tables

The subtable length from the kern table is only uint16. Fonts like
Cambria, Calibri or Corbel have more then 10k kerning pairs and the
encoded length is truncated to uint16. Validate length with truncated
values as well.

Change-Id: I788b709e913790b936d928e7b1e92f628b9c0adf
Reviewed-on: https://go-review.googlesource.com/c/159637
Reviewed-by: Nigel Tao <nigeltao@golang.org>
1 file changed
tree: 640da1a261da273c6700e0dfb478a73c573a3249
  1. bmp/
  2. cmd/
  3. colornames/
  4. draw/
  5. example/
  6. font/
  7. math/
  8. riff/
  9. testdata/
  10. tiff/
  11. vector/
  12. vp8/
  13. vp8l/
  14. webp/
  15. .gitattributes
  16. .gitignore
  17. AUTHORS
  18. codereview.cfg
  19. CONTRIBUTING.md
  20. CONTRIBUTORS
  21. go.mod
  22. go.sum
  23. LICENSE
  24. PATENTS
  25. README.md
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