mirror of
https://github.com/etcd-io/etcd.git
synced 2024-09-27 06:25:44 +00:00
43 lines
1.2 KiB
Go
43 lines
1.2 KiB
Go
// Copyright 2017 The etcd Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package namespace
|
|
|
|
func prefixInterval(pfx string, key, end []byte) (pfxKey []byte, pfxEnd []byte) {
|
|
pfxKey = make([]byte, len(pfx)+len(key))
|
|
copy(pfxKey[copy(pfxKey, pfx):], key)
|
|
|
|
if len(end) == 1 && end[0] == 0 {
|
|
// the edge of the keyspace
|
|
pfxEnd = make([]byte, len(pfx))
|
|
copy(pfxEnd, pfx)
|
|
ok := false
|
|
for i := len(pfxEnd) - 1; i >= 0; i-- {
|
|
if pfxEnd[i]++; pfxEnd[i] != 0 {
|
|
ok = true
|
|
break
|
|
}
|
|
}
|
|
if !ok {
|
|
// 0xff..ff => 0x00
|
|
pfxEnd = []byte{0}
|
|
}
|
|
} else if len(end) >= 1 {
|
|
pfxEnd = make([]byte, len(pfx)+len(end))
|
|
copy(pfxEnd[copy(pfxEnd, pfx):], end)
|
|
}
|
|
|
|
return pfxKey, pfxEnd
|
|
}
|