Платформа ЦРНП "Мирокод" для разработки проектов
https://git.mirocod.ru
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55 lines
1.3 KiB
55 lines
1.3 KiB
// Copyright (c) 2017 Couchbase, Inc. |
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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 vellum |
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func deltaAddr(base, trans uint64) uint64 { |
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// transition dest of 0 is special case |
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if trans == 0 { |
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return 0 |
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} |
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return base - trans |
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} |
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const packOutMask = 1<<4 - 1 |
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func encodePackSize(transSize, outSize int) byte { |
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var rv byte |
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rv = byte(transSize << 4) |
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rv |= byte(outSize) |
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return rv |
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} |
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func decodePackSize(pack byte) (transSize int, packSize int) { |
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transSize = int(pack >> 4) |
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packSize = int(pack & packOutMask) |
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return |
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} |
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const maxNumTrans = 1<<6 - 1 |
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func encodeNumTrans(n int) byte { |
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if n <= maxNumTrans { |
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return byte(n) |
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} |
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return 0 |
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} |
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func readPackedUint(data []byte) (rv uint64) { |
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for i := range data { |
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shifted := uint64(data[i]) << uint(i*8) |
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rv |= shifted |
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} |
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return |
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}
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