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package util
import (
"lukeshu.com/btrfs-tools/pkg/binstruct"
)
type File[A ~int64] interface {
Name() string
Size() (A, error)
ReadAt(p []byte, off A) (n int, err error)
}
type Ref[A ~int64, T any] struct {
File File[A]
Addr A
Data T
}
func (r *Ref[A, T]) Read() error {
size := binstruct.StaticSize(r.Data)
buf := make([]byte, size)
if _, err := r.File.ReadAt(buf, r.Addr); err != nil {
return err
}
if _, err := binstruct.Unmarshal(buf, &r.Data); err != nil {
return err
}
return nil
}
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