Set up fuzzing with go-fuzz

.gitignore

@@ -1,2 +1,4 @@
-gh-pages/
+/gh-pages/
 /go-org
+/fuzz
+/org-fuzz.zip

Makefile

@@ -32,3 +32,13 @@ generate-gh-pages: build
 .PHONY: generate-fixtures
 generate-fixtures: build
 	./etc/generate-fixtures
+
+.PHONY: fuzz
+fuzz: build
+	@echo also see "http://lcamtuf.coredump.cx/afl/README.txt"
+	go get github.com/dvyukov/go-fuzz/go-fuzz
+	go get github.com/dvyukov/go-fuzz/go-fuzz-build
+	mkdir -p fuzz fuzz/corpus
+	cp org/testdata/*.org fuzz/corpus
+	go-fuzz-build github.com/niklasfasching/go-org/org
+	go-fuzz -bin=./org-fuzz.zip -workdir=fuzz

org/fuzz.go

@@ -0,0 +1,19 @@
+// +build gofuzz
+
+package org
+
+import "bytes"
+
+// Fuzz function to be used by https://github.com/dvyukov/go-fuzz
+func Fuzz(data []byte) int {
+	d := NewDocument().Silent().Parse(bytes.NewReader(data))
+	_, err := d.Write(NewOrgWriter())
+	if err != nil {
+		panic(err)
+	}
+	_, err = d.Write(NewHTMLWriter())
+	if err != nil {
+		panic(err)
+	}
+	return 0
+}