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pack.go
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pack.go
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// Copyright 2018-2022 Burak Sezer
//
// 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 table
import (
"github.com/RoaringBitmap/roaring/roaring64"
"github.com/vmihailenco/msgpack/v5"
)
type Pack struct {
Offset uint64
Allocated uint64
Inuse uint64
Garbage uint64
RecycledAt int64
State State
HKeys map[uint64]uint64
OffsetIndex []byte
Memory []byte
}
func Encode(t *Table) ([]byte, error) {
offsetIndex, err := t.offsetIndex.MarshalBinary()
if err != nil {
return nil, err
}
p := Pack{
Offset: t.offset,
Allocated: t.allocated,
Inuse: t.inuse,
Garbage: t.garbage,
RecycledAt: t.recycledAt,
State: t.state,
HKeys: t.hkeys,
OffsetIndex: offsetIndex,
}
p.Memory = make([]byte, t.offset)
copy(p.Memory, t.memory[:t.offset])
return msgpack.Marshal(p)
}
func Decode(data []byte) (*Table, error) {
p := &Pack{}
err := msgpack.Unmarshal(data, p)
if err != nil {
return nil, err
}
rb := roaring64.New()
err = rb.UnmarshalBinary(p.OffsetIndex)
if err != nil {
return nil, err
}
t := New(p.Allocated)
t.offset = p.Offset
t.inuse = p.Inuse
t.garbage = p.Garbage
t.recycledAt = p.RecycledAt
t.state = p.State
t.hkeys = p.HKeys
t.offsetIndex = rb
copy(t.memory[:t.offset], p.Memory)
return t, nil
}