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29 lines
542 B
Go
29 lines
542 B
Go
package hashing
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import (
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"hash"
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"io"
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)
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// A Reader hashes all data read from the underlying reader.
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type Reader struct {
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r io.Reader
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h hash.Hash
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}
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// NewReader returns a new Reader that uses the hash h.
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func NewReader(r io.Reader, h hash.Hash) *Reader {
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return &Reader{r: r, h: h}
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}
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func (h *Reader) Read(p []byte) (int, error) {
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n, err := h.r.Read(p)
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_, _ = h.h.Write(p[:n]) // Never returns an error.
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return n, err
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}
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// Sum returns the hash of the data read so far.
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func (h *Reader) Sum(d []byte) []byte {
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return h.h.Sum(d)
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}
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