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47 lines
1.2 KiB
Go
47 lines
1.2 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2016 Canonical Ltd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package osutil
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import (
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"crypto"
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"io"
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"os"
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)
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const (
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hashDigestBufSize = 2 * 1024 * 1024
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)
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// FileDigest computes a hash digest of the file using the given hash.
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// It also returns the file size.
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func FileDigest(filename string, hash crypto.Hash) ([]byte, uint64, error) {
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f, err := os.Open(filename)
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if err != nil {
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return nil, 0, err
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}
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defer f.Close()
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h := hash.New()
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size, err := io.CopyBuffer(h, f, make([]byte, hashDigestBufSize))
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if err != nil {
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return nil, 0, err
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}
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return h.Sum(nil), uint64(size), nil
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}
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