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