1//  Copyright (c) 2017 Couchbase, Inc.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// 		http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package zap
16
17import "encoding/binary"
18
19func (s *SegmentBase) getDocStoredMetaAndCompressed(docNum uint64) ([]byte, []byte) {
20	_, storedOffset, n, metaLen, dataLen := s.getDocStoredOffsets(docNum)
21
22	meta := s.mem[storedOffset+n : storedOffset+n+metaLen]
23	data := s.mem[storedOffset+n+metaLen : storedOffset+n+metaLen+dataLen]
24
25	return meta, data
26}
27
28func (s *SegmentBase) getDocStoredOffsets(docNum uint64) (
29	uint64, uint64, uint64, uint64, uint64) {
30	indexOffset := s.storedIndexOffset + (8 * docNum)
31
32	storedOffset := binary.BigEndian.Uint64(s.mem[indexOffset : indexOffset+8])
33
34	var n uint64
35
36	metaLen, read := binary.Uvarint(s.mem[storedOffset : storedOffset+binary.MaxVarintLen64])
37	n += uint64(read)
38
39	dataLen, read := binary.Uvarint(s.mem[storedOffset+n : storedOffset+n+binary.MaxVarintLen64])
40	n += uint64(read)
41
42	return indexOffset, storedOffset, n, metaLen, dataLen
43}
44