dep ensure

vendor/github.com/hanwen/go-fuse/splice/copy.go

@@ -0,0 +1,70 @@
+// 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
+}