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33 lines
766 B
33 lines
766 B
8 years ago
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// Copyright (c) 2014, Suryandaru Triandana <syndtr@gmail.com>
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// All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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package util
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// Range is a key range.
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type Range struct {
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// Start of the key range, include in the range.
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Start []byte
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// Limit of the key range, not include in the range.
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Limit []byte
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}
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// BytesPrefix returns key range that satisfy the given prefix.
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// This only applicable for the standard 'bytes comparer'.
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func BytesPrefix(prefix []byte) *Range {
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var limit []byte
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for i := len(prefix) - 1; i >= 0; i-- {
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c := prefix[i]
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if c < 0xff {
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limit = make([]byte, i+1)
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copy(limit, prefix)
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limit[i] = c + 1
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break
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}
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}
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return &Range{prefix, limit}
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}
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