From 9d2dc5c06f2c33eeaf618a8d9759c8cc05c04743 Mon Sep 17 00:00:00 2001
From: Ryan Oldenburg <guzba8@gmail.com>
Date: Mon, 26 Apr 2021 02:05:27 -0500
Subject: [PATCH] fuzz opentype

---
 tests/common.nim        |  7 +++++++
 tests/fuzz_opentype.nim | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 tests/common.nim
 create mode 100644 tests/fuzz_opentype.nim

diff --git a/tests/common.nim b/tests/common.nim
new file mode 100644
index 0000000..697c081
--- /dev/null
+++ b/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()
diff --git a/tests/fuzz_opentype.nim b/tests/fuzz_opentype.nim
new file mode 100644
index 0000000..a02bb09
--- /dev/null
+++ b/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