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farhany/TeeReader.go

Created April 24, 2019 03:58
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Basic use of TeeReader to reduce memory consumption
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TeeReader.go
// Source: https://stackoverflow.com/questions/41947307/how-to-return-hash-and-bytes-in-one-step-in-go
hasher := sha256.New()
f, err := os.Open(fname)
data := io.TeeReader(f, hasher)
// Now read from data as usual, which is still a stream.
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