ceremonyclient/pebble/internal/manifest/level.go
Cassandra Heart 2e2a1e4789
v1.2.0 (#31)
2024-01-03 01:31:42 -06:00

47 lines
1.2 KiB
Go

// Copyright 2020 The LevelDB-Go and Pebble Authors. All rights reserved. Use
// of this source code is governed by a BSD-style license that can be found in
// the LICENSE file.
package manifest
import "fmt"
const (
// 3 bits are necessary to represent level values from 0-6.
levelBits = 3
levelMask = (1 << levelBits) - 1
// invalidSublevel denotes an invalid or non-applicable sublevel.
invalidSublevel = -1
)
// Level encodes a level and optional sublevel for use in log and error
// messages. The encoding has the property that Level(0) ==
// L0Sublevel(invalidSublevel).
type Level uint32
func makeLevel(level, sublevel int) Level {
return Level(((sublevel + 1) << levelBits) | level)
}
// LevelToInt returns the int representation of a Level
func LevelToInt(l Level) int {
return int(l) & levelMask
}
// L0Sublevel returns a Level representing the specified L0 sublevel.
func L0Sublevel(sublevel int) Level {
if sublevel < 0 {
panic(fmt.Sprintf("invalid L0 sublevel: %d", sublevel))
}
return makeLevel(0, sublevel)
}
func (l Level) String() string {
level := int(l) & levelMask
sublevel := (int(l) >> levelBits) - 1
if sublevel != invalidSublevel {
return fmt.Sprintf("L%d.%d", level, sublevel)
}
return fmt.Sprintf("L%d", level)
}