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81 lines
2 KiB
Go
81 lines
2 KiB
Go
package backend_test
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import (
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"bytes"
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"crypto/rand"
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"crypto/sha256"
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"io"
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"io/ioutil"
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"testing"
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"github.com/restic/restic/backend"
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. "github.com/restic/restic/test"
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)
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func TestHashAppendWriter(t *testing.T) {
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tests := []int{5, 23, 2<<18 + 23, 1 << 20}
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for _, size := range tests {
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data := make([]byte, size)
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_, err := io.ReadFull(rand.Reader, data)
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if err != nil {
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t.Fatalf("ReadFull: %v", err)
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}
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expectedHash := sha256.Sum256(data)
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target := bytes.NewBuffer(nil)
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wr := backend.NewHashAppendWriter(target, sha256.New())
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_, err = wr.Write(data)
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OK(t, err)
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OK(t, wr.Close())
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Assert(t, len(target.Bytes()) == size+len(expectedHash),
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"HashAppendWriter: invalid number of bytes written: got %d, expected %d",
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len(target.Bytes()), size+len(expectedHash))
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r := target.Bytes()
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resultingHash := r[len(r)-len(expectedHash):]
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Assert(t, bytes.Equal(expectedHash[:], resultingHash),
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"HashAppendWriter: hashes do not match: expected %02x, got %02x",
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expectedHash, resultingHash)
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// write again, this must return an error
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_, err = wr.Write([]byte{23})
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Assert(t, err != nil,
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"HashAppendWriter: Write() after Close() did not return an error")
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}
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}
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func TestHashingWriter(t *testing.T) {
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tests := []int{5, 23, 2<<18 + 23, 1 << 20}
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for _, size := range tests {
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data := make([]byte, size)
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_, err := io.ReadFull(rand.Reader, data)
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if err != nil {
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t.Fatalf("ReadFull: %v", err)
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}
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expectedHash := sha256.Sum256(data)
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wr := backend.NewHashingWriter(ioutil.Discard, sha256.New())
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n, err := io.Copy(wr, bytes.NewReader(data))
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OK(t, err)
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Assert(t, n == int64(size),
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"HashAppendWriter: invalid number of bytes written: got %d, expected %d",
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n, size)
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Assert(t, wr.Size() == size,
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"HashAppendWriter: invalid number of bytes returned: got %d, expected %d",
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wr.Size, size)
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resultingHash := wr.Sum(nil)
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Assert(t, bytes.Equal(expectedHash[:], resultingHash),
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"HashAppendWriter: hashes do not match: expected %02x, got %02x",
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expectedHash, resultingHash)
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}
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}
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