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package filecache
import (
"errors"
"os"
"sync"
"github.com/anacrolix/missinggo/pproffd"
)
type File struct {
path key
f pproffd.OSFile
afterWrite func(endOff int64)
onRead func(n int)
mu sync.Mutex
offset int64
}
func (me *File) Seek(offset int64, whence int) (ret int64, err error) {
ret, err = me.f.Seek(offset, whence)
if err != nil {
return
}
me.offset = ret
return
}
var (
ErrFileTooLarge = errors.New("file too large for cache")
ErrFileDisappeared = errors.New("file disappeared")
)
func (me *File) Write(b []byte) (n int, err error) {
n, err = me.f.Write(b)
me.offset += int64(n)
me.afterWrite(me.offset)
return
}
func (me *File) WriteAt(b []byte, off int64) (n int, err error) {
n, err = me.f.WriteAt(b, off)
me.afterWrite(off + int64(n))
return
}
func (me *File) Close() error {
return me.f.Close()
}
func (me *File) Stat() (os.FileInfo, error) {
return me.f.Stat()
}
func (me *File) Read(b []byte) (n int, err error) {
n, err = me.f.Read(b)
me.onRead(n)
return
}
func (me *File) ReadAt(b []byte, off int64) (n int, err error) {
n, err = me.f.ReadAt(b, off)
me.onRead(n)
return
}
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