status-go/vendor/github.com/anacrolix/missinggo/section_writer.go

24 lines
427 B
Go

package missinggo
import "io"
type SectionWriter struct {
w io.WriterAt
off, len int64
}
func NewSectionWriter(w io.WriterAt, off, len int64) *SectionWriter {
return &SectionWriter{w, off, len}
}
func (me *SectionWriter) WriteAt(b []byte, off int64) (n int, err error) {
if off >= me.len {
err = io.EOF
return
}
if off+int64(len(b)) > me.len {
b = b[:me.len-off]
}
return me.w.WriteAt(b, me.off+off)
}