storj/pkg/metainfo/kvmetainfo/paths.go
2018-11-06 13:40:06 +02:00

39 lines
907 B
Go

// Copyright (C) 2018 Storj Labs, Inc.
// See LICENSE for copying information.
package kvmetainfo
import (
"fmt"
"storj.io/storj/pkg/storj"
)
// TODO: known issue:
// this is incorrect since there's no good way to get such a path
// since the exact previous key is
// append(previousPrefix(cursor), infinite(0xFF)...)
func keyBefore(cursor string) string {
if cursor == "" {
return ""
}
before := []byte(cursor)
if before[len(before)-1] == 0 {
return string(before[:len(before)-1])
}
before[len(before)-1]--
before = append(before, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF)
return string(before)
}
func keyAfter(cursor string) string {
return cursor + "\x00"
}
// getSegmentPath returns the unique path for a particular segment
func getSegmentPath(encryptedPath storj.Path, segNum int64) storj.Path {
return storj.JoinPaths(fmt.Sprintf("s%d", segNum), encryptedPath)
}