restic/backend/reader_test.go

81 lines
2.1 KiB
Go

package backend_test
import (
"bytes"
"crypto/rand"
"crypto/sha256"
"io"
"io/ioutil"
"testing"
"github.com/restic/restic/backend"
)
func TestHashAppendReader(t *testing.T) {
tests := []int{5, 23, 2<<18 + 23, 1 << 20}
for _, size := range tests {
data := make([]byte, size)
_, err := io.ReadFull(rand.Reader, data)
if err != nil {
t.Fatalf("ReadFull: %v", err)
}
expectedHash := sha256.Sum256(data)
rd := backend.NewHashAppendReader(bytes.NewReader(data), sha256.New())
target := bytes.NewBuffer(nil)
n, err := io.Copy(target, rd)
ok(t, err)
assert(t, n == int64(size)+int64(len(expectedHash)),
"HashAppendReader: invalid number of bytes read: got %d, expected %d",
n, size+len(expectedHash))
r := target.Bytes()
resultingHash := r[len(r)-len(expectedHash):]
assert(t, bytes.Equal(expectedHash[:], resultingHash),
"HashAppendReader: hashes do not match: expected %02x, got %02x",
expectedHash, resultingHash)
// try to read again, must return io.EOF
n2, err := rd.Read(make([]byte, 100))
assert(t, n2 == 0, "HashAppendReader returned %d additional bytes", n)
assert(t, err == io.EOF, "HashAppendReader returned %v instead of EOF", err)
}
}
func TestHashingReader(t *testing.T) {
tests := []int{5, 23, 2<<18 + 23, 1 << 20}
for _, size := range tests {
data := make([]byte, size)
_, err := io.ReadFull(rand.Reader, data)
if err != nil {
t.Fatalf("ReadFull: %v", err)
}
expectedHash := sha256.Sum256(data)
rd := backend.NewHashingReader(bytes.NewReader(data), sha256.New())
n, err := io.Copy(ioutil.Discard, rd)
ok(t, err)
assert(t, n == int64(size),
"HashAppendReader: invalid number of bytes read: got %d, expected %d",
n, size)
resultingHash := rd.Sum(nil)
assert(t, bytes.Equal(expectedHash[:], resultingHash),
"HashAppendReader: hashes do not match: expected %02x, got %02x",
expectedHash, resultingHash)
// try to read again, must return io.EOF
n2, err := rd.Read(make([]byte, 100))
assert(t, n2 == 0, "HashAppendReader returned %d additional bytes", n)
assert(t, err == io.EOF, "HashAppendReader returned %v instead of EOF", err)
}
}