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