cbor: create simple fuzz tests and add intial corpus

Author: Kubuxu

cbor/.gitignore

@@ -0,0 +1 @@
+cbor-fuzz.zip

cbor/cborFixtures_test.go

@@ -4,6 +4,8 @@ import (
 	"bytes"
 	"encoding/base64"
 	"fmt"
+	"io/ioutil"
+	"testing"
 
 	. "github.com/polydawn/refmt/tok"
 	"github.com/polydawn/refmt/tok/fixtures"
@@ -31,6 +33,21 @@ func deB64(s string) []byte {
 	return bs
 }
 
+func TestExportFixtures(t *testing.T) {
+	t.SkipNow()
+	for i, fix := range cborFixtures {
+		if fix.encodeResult != nil || fix.decodeResult != nil {
+			continue
+		}
+
+		err := ioutil.WriteFile(fmt.Sprintf("fuzz-data/corpus/%d", i), fix.serial, 0666)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+
+}
+
 var inapplicable = fmt.Errorf("skipme: inapplicable")
 
 var cborFixtures = []struct {

cbor/cbor_fuzz.go

@@ -0,0 +1,44 @@
+// +build gofuzz
+
+package cbor
+
+import (
+	"bytes"
+	"fmt"
+
+	"github.com/polydawn/refmt/shared"
+)
+
+func Fuzz(data []byte) int {
+	dec := NewDecoder(bytes.NewReader(data))
+	buf := &bytes.Buffer{}
+
+	// Run it once to sanitize
+	pump := shared.TokenPump{dec, NewEncoder(buf)}
+	err := pump.Run()
+	if err != nil {
+		return 0
+	}
+
+	// Run second loop to check stability
+	sanitized := buf.Bytes()
+	dec = NewDecoder(bytes.NewReader(sanitized))
+	buf = &bytes.Buffer{}
+	pump = shared.TokenPump{dec, NewEncoder(buf)}
+	err = pump.Run()
+	if err != nil {
+		fmt.Printf("input: %v, sanitized: %v", data, sanitized)
+		panic("sanitised failed to prase: " + err.Error())
+	}
+
+	out := buf.Bytes()
+	if !bytes.Equal(out, sanitized) {
+		fmt.Printf("santized: %v, output: %v\n", sanitized, out)
+		panic("looping data failed")
+	}
+
+	if len(out) == len(data) {
+		return 2
+	}
+	return 1
+}

cbor/fuzz-data/.gitignore

@@ -0,0 +1,4 @@
+*
+!.gitignore
+!corpus
+!corpus/*

cbor/fuzz-data/corpus/0

@@ -0,0 +1 @@
+evalue

cbor/fuzz-data/corpus/10

@@ -0,0 +1 @@
+�

cbor/fuzz-data/corpus/11

@@ -0,0 +1 @@
+��

cbor/fuzz-data/corpus/12

@@ -0,0 +1 @@
+�evalue

cbor/fuzz-data/corpus/13

@@ -0,0 +1 @@
+�evalue�

cbor/fuzz-data/corpus/15

@@ -0,0 +1 @@
+�evaluebv2