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android.go
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android.go
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// Copyright 2012 Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fs
import (
"bytes"
"fmt"
"log"
"syscall"
"time"
"github.com/hanwen/go-fuse/fuse"
"github.com/hanwen/go-fuse/fuse/nodefs"
)
type androidNode struct {
mtpNodeImpl
// If set, the backing file was changed.
write bool
start time.Time
byteCount int64
}
func (n *androidNode) startEdit() bool {
if n.write {
return true
}
n.start = time.Now()
n.byteCount = 0
err := n.fs.dev.AndroidBeginEditObject(n.Handle())
if err != nil {
log.Println("AndroidBeginEditObject failed:", err)
return false
}
n.write = true
return true
}
func (n *androidNode) endEdit() bool {
if !n.write {
return true
}
dt := time.Now().Sub(n.start)
log.Printf("%d bytes in %v: %d mb/s",
n.byteCount, dt, (1e3*n.byteCount)/(dt.Nanoseconds()))
err := n.fs.dev.AndroidEndEditObject(n.Handle())
if err != nil {
log.Println("AndroidEndEditObject failed:", err)
return false
}
n.write = false
return true
}
func (n *androidNode) Open(flags uint32, context *fuse.Context) (file nodefs.File, code fuse.Status) {
return &androidFile{
node: n,
File: nodefs.NewDefaultFile(),
}, fuse.OK
}
func (n *androidNode) Truncate(file nodefs.File, size uint64, context *fuse.Context) (code fuse.Status) {
w := n.write
if !n.startEdit() {
return fuse.EIO
}
err := n.fs.dev.AndroidTruncate(n.Handle(), int64(size))
if err != nil {
log.Println("AndroidTruncate failed:", err)
return fuse.EIO
}
n.Size = int64(size)
if !w {
if !n.endEdit() {
return fuse.EIO
}
}
return fuse.OK
}
var _ = mtpNode((*androidNode)(nil))
type androidFile struct {
nodefs.File
node *androidNode
}
func (f *androidFile) Read(dest []byte, off int64) (fuse.ReadResult, fuse.Status) {
if off > f.node.Size {
// ENXIO = no such address.
return nil, fuse.Status(int(syscall.ENXIO))
}
if off+int64(len(dest)) > f.node.Size {
dest = dest[:f.node.Size-off]
}
b := bytes.NewBuffer(dest[:0])
err := f.node.fs.dev.AndroidGetPartialObject64(f.node.Handle(), b, off, uint32(len(dest)))
if err != nil {
log.Println("AndroidGetPartialObject64 failed:", err)
return nil, fuse.EIO
}
return fuse.ReadResultData(dest[:b.Len()]), fuse.OK
}
func (f *androidFile) String() string {
return fmt.Sprintf("androidFile h=0x%x", f.node.Handle())
}
func (f *androidFile) Write(dest []byte, off int64) (written uint32, status fuse.Status) {
if !f.node.startEdit() {
return 0, fuse.EIO
}
f.node.byteCount += int64(len(dest))
b := bytes.NewBuffer(dest)
err := f.node.fs.dev.AndroidSendPartialObject(f.node.Handle(), off, uint32(len(dest)), b)
if err != nil {
log.Println("AndroidSendPartialObject failed:", err)
return 0, fuse.EIO
}
written = uint32(len(dest) - b.Len())
if off+int64(written) > f.node.Size {
f.node.Size = off + int64(written)
}
return written, fuse.OK
}
func (f *androidFile) Flush() fuse.Status {
if !f.node.endEdit() {
return fuse.EIO
}
return fuse.OK
}