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restic/internal/hashing/reader.go

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2017-01-22 11:43:36 +00:00
package hashing
import (
"hash"
"io"
)
// Reader hashes all data read from the underlying reader.
type Reader struct {
r io.Reader
h hash.Hash
}
// NewReader returns a new Reader that uses the hash h.
func NewReader(r io.Reader, h hash.Hash) *Reader {
return &Reader{
h: h,
r: io.TeeReader(r, h),
}
}
func (h *Reader) Read(p []byte) (int, error) {
return h.r.Read(p)
}
// Sum returns the hash of the data read so far.
func (h *Reader) Sum(d []byte) []byte {
return h.h.Sum(d)
}