| // 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 |
| } |
