70 lines
1.2 KiB
Go
70 lines
1.2 KiB
Go
// Copyright 2016 the Go-FUSE Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package splice
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import (
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"io"
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"os"
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)
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func SpliceCopy(dst *os.File, src *os.File, p *Pair) (int64, error) {
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total := int64(0)
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for {
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n, err := p.LoadFrom(src.Fd(), p.size)
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if err != nil {
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return total, err
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}
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if n == 0 {
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break
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}
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m, err := p.WriteTo(dst.Fd(), n)
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total += int64(m)
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if err != nil {
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return total, err
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}
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if m < n {
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return total, err
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}
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if int(n) < p.size {
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break
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}
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}
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return total, nil
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}
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// Argument ordering follows io.Copy.
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func CopyFile(dstName string, srcName string, mode int) error {
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src, err := os.Open(srcName)
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if err != nil {
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return err
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}
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defer src.Close()
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dst, err := os.OpenFile(dstName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.FileMode(mode))
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if err != nil {
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return err
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}
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defer dst.Close()
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return CopyFds(dst, src)
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}
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func CopyFds(dst *os.File, src *os.File) (err error) {
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p, err := splicePool.get()
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if p != nil {
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p.Grow(256 * 1024)
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_, err := SpliceCopy(dst, src, p)
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splicePool.done(p)
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return err
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} else {
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_, err = io.Copy(dst, src)
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}
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if err == io.EOF {
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err = nil
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}
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return err
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}
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