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mmap_span.go
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/
mmap_span.go
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package mmap_span
import (
"io"
"log"
"github.com/edsrzf/mmap-go"
)
type segment struct {
*mmap.MMap
}
func (me segment) Size() int64 {
return int64(len(*me.MMap))
}
type MMapSpan struct {
span
}
func (me *MMapSpan) Append(mmap mmap.MMap) {
me.span = append(me.span, segment{&mmap})
}
func (me MMapSpan) Close() error {
for _, mMap := range me.span {
err := mMap.(segment).Unmap()
if err != nil {
log.Print(err)
}
}
return nil
}
func (me MMapSpan) Size() (ret int64) {
for _, seg := range me.span {
ret += seg.Size()
}
return
}
func (me MMapSpan) ReadAt(p []byte, off int64) (n int, err error) {
me.ApplyTo(off, func(intervalOffset int64, interval sizer) (stop bool) {
_n := copy(p, (*interval.(segment).MMap)[intervalOffset:])
p = p[_n:]
n += _n
return len(p) == 0
})
if len(p) != 0 {
err = io.EOF
}
return
}
func (me MMapSpan) WriteAt(p []byte, off int64) (n int, err error) {
me.ApplyTo(off, func(iOff int64, i sizer) (stop bool) {
mMap := i.(segment)
_n := copy((*mMap.MMap)[iOff:], p)
// err = mMap.Sync(gommap.MS_ASYNC)
// if err != nil {
// return true
// }
p = p[_n:]
n += _n
return len(p) == 0
})
if err != nil && len(p) != 0 {
err = io.ErrShortWrite
}
return
}