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// Copyright 2019 Google LLC
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
package stream_test
import (
"bytes"
"crypto/rand"
"fmt"
"testing"
"github.com/muesli/sasquatch/stream"
"golang.org/x/crypto/chacha20poly1305"
)
const cs = stream.ChunkSize
func TestRoundTrip(t *testing.T) {
for _, stepSize := range []int{512, 600, 1000, cs} {
for _, length := range []int{0, 1000, cs, cs + 100} {
t.Run(fmt.Sprintf("len=%d,step=%d", length, stepSize),
func(t *testing.T) { testRoundTrip(t, stepSize, length) })
}
}
}
func testRoundTrip(t *testing.T, stepSize, length int) {
src := make([]byte, length)
if _, err := rand.Read(src); err != nil {
t.Fatal(err)
}
buf := &bytes.Buffer{}
key := make([]byte, chacha20poly1305.KeySize)
if _, err := rand.Read(key); err != nil {
t.Fatal(err)
}
w, err := stream.NewWriter(key, buf)
if err != nil {
t.Fatal(err)
}
var n int
for n < length {
b := length - n
if b > stepSize {
b = stepSize
}
nn, err := w.Write(src[n : n+b])
if err != nil {
t.Fatal(err)
}
if nn != b {
t.Errorf("Write returned %d, expected %d", nn, b)
}
n += nn
nn, err = w.Write(src[n:n])
if err != nil {
t.Fatal(err)
}
if nn != 0 {
t.Errorf("Write returned %d, expected 0", nn)
}
}
if err := w.Close(); err != nil {
t.Error("Close returned an error:", err)
}
t.Logf("buffer size: %d", buf.Len())
r, err := stream.NewReader(key, buf)
if err != nil {
t.Fatal(err)
}
n = 0
readBuf := make([]byte, stepSize)
for n < length {
b := length - n
if b > stepSize {
b = stepSize
}
nn, err := r.Read(readBuf)
if err != nil {
t.Fatalf("Read error at index %d: %v", n, err)
}
if !bytes.Equal(readBuf[:nn], src[n:n+nn]) {
t.Errorf("wrong data at indexes %d - %d", n, n+nn)
}
n += nn
}
}
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