[opentype] add regression test

go-text · Oct 13, 2023 · fba8cc7 · fba8cc7
1 parent 87ab5ec
commit fba8cc7
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diff --git a/opentype/api/font/test/Selawik-VF-Subset.ttf b/opentype/api/font/test/Selawik-VF-Subset.ttf
diff --git a/opentype/api/font/variations_test.go b/opentype/api/font/variations_test.go
@@ -3,6 +3,7 @@
 package font
 
 import (
+	"os"
 	"reflect"
 	"testing"
 
@@ -122,3 +123,29 @@ func TestAdvanceNoHVar(t *testing.T) {
 		tu.Assert(t, exp == got)
 	}
 }
+
+func TestInvalidGVAR(t *testing.T) {
+	f, err := os.Open("test/Selawik-VF-Subset.ttf")
+	tu.AssertNoErr(t, err)
+	defer f.Close()
+
+	ld, err := loader.NewLoader(f)
+	tu.AssertNoErr(t, err)
+
+	head, _, _ := LoadHeadTable(ld, nil)
+	raw, _ := ld.RawTable(loader.MustNewTag("maxp"))
+	maxp, _, _ := tables.ParseMaxp(raw)
+	raw, _ = ld.RawTable(loader.MustNewTag("glyf"))
+	locaRaw, _ := ld.RawTable(loader.MustNewTag("loca"))
+	loca, _ := tables.ParseLoca(locaRaw, int(maxp.NumGlyphs), head.IndexToLocFormat == 1)
+	glyf, _ := tables.ParseGlyf(raw, loca)
+
+	raw, err = ld.RawTable(loader.MustNewTag("gvar"))
+	tu.AssertNoErr(t, err)
+	gvar, _, err := tables.ParseGvar(raw)
+	tu.AssertNoErr(t, err)
+	// check that newGvar does not crash..
+	_, err = newGvar(gvar, glyf)
+	// ... and report and error
+	tu.Assert(t, err != nil)
+}