fuzz opentype

tests/common.nim

@@ -0,0 +1,7 @@
+import algorithm, os
+
+proc findAllFonts*(rootPath: string): seq[string] =
+  for fontPath in walkDirRec(rootPath):
+    if splitFile(fontPath).ext in [".ttf", ".otf"]:
+      result.add(fontPath)
+  result.sort()

tests/fuzz_opentype.nim

@@ -0,0 +1,32 @@
+import common, random, pixie, strformat, unicode
+
+randomize()
+
+let fontPaths = findAllFonts("tests/fonts")
+
+doAssert fontPaths.len > 0
+
+for i in 0 ..< 10000:
+  var
+    file = fontPaths[rand(fontPaths.len - 1)]
+    data = readFile(file)
+    pos = rand(data.len)
+    value = rand(255).char
+  data[pos] = value
+  echo &"{i} {file} {pos} {value.uint8}"
+  try:
+    let font = parseOtf(data)
+    doAssert font != nil
+    for i in 0.uint16 ..< uint16.high:
+      discard font.getGlyphPath(Rune(i.int))
+  except PixieError:
+    discard
+
+  data = data[0 ..< pos]
+  try:
+    let font = parseOtf(data)
+    doAssert font != nil
+    for i in 0.uint16 ..< uint16.high:
+      discard font.getGlyphPath(Rune(i.int))
+  except PixieError:
+    discard