-
Notifications
You must be signed in to change notification settings - Fork 16
/
encode.go
151 lines (131 loc) · 3.53 KB
/
encode.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/*
* Atree - Scalable Arrays and Ordered Maps
*
* Copyright Flow Foundation
*
* 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 atree
import (
"io"
"math"
"github.com/fxamacker/cbor/v2"
)
// Encoder writes atree slabs to io.Writer.
type Encoder struct {
io.Writer
CBOR *cbor.StreamEncoder
Scratch [64]byte
encMode cbor.EncMode
_inlinedExtraData *InlinedExtraData
}
func NewEncoder(w io.Writer, encMode cbor.EncMode) *Encoder {
streamEncoder := encMode.NewStreamEncoder(w)
return &Encoder{
Writer: w,
CBOR: streamEncoder,
encMode: encMode,
}
}
func (enc *Encoder) inlinedExtraData() *InlinedExtraData {
if enc._inlinedExtraData == nil {
enc._inlinedExtraData = newInlinedExtraData()
}
return enc._inlinedExtraData
}
func (enc *Encoder) hasInlinedExtraData() bool {
if enc._inlinedExtraData == nil {
return false
}
return !enc._inlinedExtraData.empty()
}
type StorableDecoder func(
decoder *cbor.StreamDecoder,
storableSlabID SlabID,
inlinedExtraData []ExtraData,
) (
Storable,
error,
)
func DecodeSlab(
id SlabID,
data []byte,
decMode cbor.DecMode,
decodeStorable StorableDecoder,
decodeTypeInfo TypeInfoDecoder,
) (
Slab,
error,
) {
if len(data) < versionAndFlagSize {
return nil, NewDecodingErrorf("data is too short")
}
h, err := newHeadFromData(data[:versionAndFlagSize])
if err != nil {
return nil, NewDecodingError(err)
}
switch h.getSlabType() {
case slabArray:
arrayDataType := h.getSlabArrayType()
switch arrayDataType {
case slabArrayData:
return newArrayDataSlabFromData(id, data, decMode, decodeStorable, decodeTypeInfo)
case slabArrayMeta:
return newArrayMetaDataSlabFromData(id, data, decMode, decodeTypeInfo)
case slabBasicArray:
return newBasicArrayDataSlabFromData(id, data, decMode, decodeStorable)
default:
return nil, NewDecodingErrorf("data has invalid head 0x%x", h[:])
}
case slabMap:
mapDataType := h.getSlabMapType()
switch mapDataType {
case slabMapData:
return newMapDataSlabFromData(id, data, decMode, decodeStorable, decodeTypeInfo)
case slabMapMeta:
return newMapMetaDataSlabFromData(id, data, decMode, decodeTypeInfo)
case slabMapCollisionGroup:
return newMapDataSlabFromData(id, data, decMode, decodeStorable, decodeTypeInfo)
default:
return nil, NewDecodingErrorf("data has invalid head 0x%x", h[:])
}
case slabStorable:
cborDec := decMode.NewByteStreamDecoder(data[versionAndFlagSize:])
storable, err := decodeStorable(cborDec, id, nil)
if err != nil {
// Wrap err as external error (if needed) because err is returned by StorableDecoder callback.
return nil, wrapErrorfAsExternalErrorIfNeeded(err, "failed to decode slab storable")
}
return &StorableSlab{
slabID: id,
storable: storable,
}, nil
default:
return nil, NewDecodingErrorf("data has invalid head 0x%x", h[:])
}
}
func GetUintCBORSize(n uint64) uint32 {
if n <= 23 {
return 1
}
if n <= math.MaxUint8 {
return 2
}
if n <= math.MaxUint16 {
return 3
}
if n <= math.MaxUint32 {
return 5
}
return 9
}