5a035dc9aa
The zap SegmentBase struct is a refactoring of the zap Segment into the subset of fields that are needed for read-only ops, without any persistence related info. This allows us to use zap's optimized data encoding as scorch's in-memory segments. The zap Segment struct now embeds a zap SegmentBase struct, and layers on persistence. Both the zap Segment and zap SegmentBase implement scorch's Segment interface.
32 lines
1.3 KiB
Go
32 lines
1.3 KiB
Go
// Copyright (c) 2017 Couchbase, Inc.
|
|
//
|
|
// 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 zap
|
|
|
|
import "encoding/binary"
|
|
|
|
func (s *SegmentBase) getDocStoredMetaAndCompressed(docNum uint64) ([]byte, []byte) {
|
|
docStoredStartAddr := s.storedIndexOffset + (8 * docNum)
|
|
docStoredStart := binary.BigEndian.Uint64(s.mem[docStoredStartAddr : docStoredStartAddr+8])
|
|
var n uint64
|
|
metaLen, read := binary.Uvarint(s.mem[docStoredStart : docStoredStart+binary.MaxVarintLen64])
|
|
n += uint64(read)
|
|
var dataLen uint64
|
|
dataLen, read = binary.Uvarint(s.mem[docStoredStart+n : docStoredStart+n+binary.MaxVarintLen64])
|
|
n += uint64(read)
|
|
meta := s.mem[docStoredStart+n : docStoredStart+n+metaLen]
|
|
data := s.mem[docStoredStart+n+metaLen : docStoredStart+n+metaLen+dataLen]
|
|
return meta, data
|
|
}
|