Add zlib fuzzer

Author: bookmoons

examples/zlib/fuzz.js

@@ -0,0 +1,36 @@
+const pako = require('pako')
+
+async function fuzz (bytes) {
+  try {
+    pako.deflate(bytes)
+    pako.inflate(bytes)
+  } catch (error) {
+    if (!acceptable(error)) throw error
+  }
+}
+
+function acceptable (error) {
+  return (
+    typeof error === 'string' &&
+    !!expected.find(message => error.startsWith(message))
+  )
+}
+
+const expected = [
+  'buffer error',
+  'incorrect header check',
+  'unknown compression method',
+  'invalid window size',
+  'invalid distance',
+  'invalid block type',
+  'invalid code lengths',
+  'too many length or distance symbols',
+  'invalid stored block lengths',
+  'need dictionary',
+  'incorrect data check',
+  'invalid literal/length code',
+  'invalid bit length repeat',
+  'invalid code'
+]
+
+exports.fuzz = fuzz

examples/zlib/package-lock.json

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