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// 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)
}
}
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