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mirror of https://github.com/octoleo/restic.git synced 2024-12-24 11:55:28 +00:00

Remove unneeded HashingReader implementation

This commit is contained in:
Alexander Neumann 2016-01-26 22:00:11 +01:00
parent eb1669a061
commit 7196971159
2 changed files with 0 additions and 83 deletions

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@ -1,38 +0,0 @@
package backend
import (
"hash"
"io"
)
// HashingWriter wraps an io.Writer to hashes all data that is written to it.
type HashingWriter struct {
w io.Writer
h hash.Hash
size int
}
// NewHashAppendWriter wraps the writer w and feeds all data written to the hash h.
func NewHashingWriter(w io.Writer, h hash.Hash) *HashingWriter {
return &HashingWriter{
h: h,
w: io.MultiWriter(w, h),
}
}
// Write wraps the write method of the underlying writer and also hashes all data.
func (h *HashingWriter) Write(p []byte) (int, error) {
n, err := h.w.Write(p)
h.size += n
return n, err
}
// Sum returns the hash of all data written so far.
func (h *HashingWriter) Sum(d []byte) []byte {
return h.h.Sum(d)
}
// Size returns the number of bytes written to the underlying writer.
func (h *HashingWriter) Size() int {
return h.size
}

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@ -1,45 +0,0 @@
package backend_test
import (
"bytes"
"crypto/rand"
"crypto/sha256"
"io"
"io/ioutil"
"testing"
"github.com/restic/restic/backend"
. "github.com/restic/restic/test"
)
func TestHashingWriter(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)
wr := backend.NewHashingWriter(ioutil.Discard, sha256.New())
n, err := io.Copy(wr, bytes.NewReader(data))
OK(t, err)
Assert(t, n == int64(size),
"HashAppendWriter: invalid number of bytes written: got %d, expected %d",
n, size)
Assert(t, wr.Size() == size,
"HashAppendWriter: invalid number of bytes returned: got %d, expected %d",
wr.Size, size)
resultingHash := wr.Sum(nil)
Assert(t, bytes.Equal(expectedHash[:], resultingHash),
"HashAppendWriter: hashes do not match: expected %02x, got %02x",
expectedHash, resultingHash)
}
}