Add gif fuzzer

Author: bookmoons

examples/gif/fuzz.js

@@ -0,0 +1,24 @@
+const omggif = require('omggif')
+
+async function fuzz (bytes) {
+  try {
+    omggif.GifReader(bytes)
+  } catch (error) {
+    if (!acceptable(error)) throw error
+  }
+}
+
+function acceptable (error) {
+  return !!expected
+    .find(message => error.message.startsWith(message))
+}
+
+const expected = [
+  'Invalid GIF 87a/89a header',
+  'Unknown gif block',
+  'Invalid block size',
+  'Invalid graphics extension block',
+  'Unknown graphic control label'
+]
+
+exports.fuzz = fuzz

examples/gif/package-lock.json

@@ -0,0 +1,9 @@
+{
+    "name": "gif-fuzz",
+    "version": "1.0.0",
+    "main": "fuzz.js",
+    "license": "ISC",
+    "dependencies": {
+        "omggif": "^1.0.10"
+    }
+}