1 files changed, 142 insertions, 0 deletions
diff --git a/pkg/hashio/hashio_test.go b/pkg/hashio/hashio_test.go
new file mode 100644
index 000000000..41dbdf860
--- /dev/null
+++ b/pkg/hashio/hashio_test.go
@@ -0,0 +1,142 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hashio
+
+import (
+	"bytes"
+	"crypto/hmac"
+	"crypto/sha256"
+	"fmt"
+	"io"
+	"math/rand"
+	"testing"
+)
+
+var testKey = []byte("01234567890123456789012345678901")
+
+func runTest(c []byte, fn func(enc *bytes.Buffer), iters int) error {
+	// Encoding happens via a buffer.
+	var (
+		enc bytes.Buffer
+		dec bytes.Buffer
+	)
+
+	for i := 0; i < iters; i++ {
+		enc.Reset()
+		w := NewWriter(&enc, hmac.New(sha256.New, testKey))
+		if _, err := io.Copy(w, bytes.NewBuffer(c)); err != nil {
+			return err
+		}
+		if err := w.Close(); err != nil {
+			return err
+		}
+	}
+
+	fn(&enc)
+
+	for i := 0; i < iters; i++ {
+		dec.Reset()
+		r := NewReader(bytes.NewReader(enc.Bytes()), hmac.New(sha256.New, testKey))
+		if _, err := io.Copy(&dec, r); err != nil {
+			return err
+		}
+	}
+
+	// Check that the data matches; this should never fail.
+	if !bytes.Equal(c, dec.Bytes()) {
+		panic(fmt.Sprintf("data didn't match: got %v, expected %v", dec.Bytes(), c))
+	}
+
+	return nil
+}
+
+func TestTable(t *testing.T) {
+	cases := [][]byte{
+		// Various data sizes.
+		nil,
+		[]byte(""),
+		[]byte("_"),
+		[]byte("0"),
+		[]byte("01"),
+		[]byte("012"),
+		[]byte("0123"),
+		[]byte("01234"),
+		[]byte("012356"),
+		[]byte("0123567"),
+		[]byte("01235678"),
+
+		// Make sure we have one longer than the hash length.
+		[]byte("012356asdjflkasjlk3jlk23j4lkjaso0d789f0aujw3lkjlkxsdf78asdful2kj3ljka78"),
+
+		// Make sure we have one longer than the segment size.
+		make([]byte, 3*SegmentSize),
+		make([]byte, 3*SegmentSize-1),
+		make([]byte, 3*SegmentSize+1),
+		make([]byte, 3*SegmentSize-32),
+		make([]byte, 3*SegmentSize+32),
+		make([]byte, 30*SegmentSize),
+	}
+
+	for _, c := range cases {
+		for _, flip := range []bool{false, true} {
+			if len(c) == 0 && flip == true {
+				continue
+			}
+
+			// Log the case.
+			t.Logf("case: len=%d flip=%v", len(c), flip)
+
+			if err := runTest(c, func(enc *bytes.Buffer) {
+				if flip {
+					corrupted := rand.Intn(enc.Len())
+					enc.Bytes()[corrupted]++
+				}
+			}, 1); err != nil {
+				if !flip || err != ErrHashMismatch {
+					t.Errorf("error during read: got %v, expected nil", err)
+				}
+				continue
+			} else if flip {
+				t.Errorf("failed to detect ErrHashMismatch on corrupted data!")
+				continue
+			}
+		}
+	}
+}
+
+const benchBytes = 10 * 1024 * 1024 // 10 MB.
+
+func BenchmarkWrite(b *testing.B) {
+	b.StopTimer()
+	x := make([]byte, benchBytes)
+	b.SetBytes(benchBytes)
+	b.StartTimer()
+	if err := runTest(x, func(enc *bytes.Buffer) {
+		b.StopTimer()
+	}, b.N); err != nil {
+		b.Errorf("benchmark failed: %v", err)
+	}
+}
+
+func BenchmarkRead(b *testing.B) {
+	b.StopTimer()
+	x := make([]byte, benchBytes)
+	b.SetBytes(benchBytes)
+	if err := runTest(x, func(enc *bytes.Buffer) {
+		b.StartTimer()
+	}, b.N); err != nil {
+		b.Errorf("benchmark failed: %v", err)
+	}
+}