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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
// Copyright (C) MongoDB, Inc. 2017-present.
//
// 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
package bsoncodec
import (
"fmt"
"math"
"reflect"
"go.mongodb.org/mongo-driver/bson/bsonoptions"
"go.mongodb.org/mongo-driver/bson/bsonrw"
"go.mongodb.org/mongo-driver/bson/bsontype"
)
// UIntCodec is the Codec used for uint values.
type UIntCodec struct {
EncodeToMinSize bool
}
var (
defaultUIntCodec = NewUIntCodec()
_ ValueCodec = defaultUIntCodec
_ typeDecoder = defaultUIntCodec
)
// NewUIntCodec returns a UIntCodec with options opts.
func NewUIntCodec(opts ...*bsonoptions.UIntCodecOptions) *UIntCodec {
uintOpt := bsonoptions.MergeUIntCodecOptions(opts...)
codec := UIntCodec{}
if uintOpt.EncodeToMinSize != nil {
codec.EncodeToMinSize = *uintOpt.EncodeToMinSize
}
return &codec
}
// EncodeValue is the ValueEncoder for uint types.
func (uic *UIntCodec) EncodeValue(ec EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
switch val.Kind() {
case reflect.Uint8, reflect.Uint16:
return vw.WriteInt32(int32(val.Uint()))
case reflect.Uint, reflect.Uint32, reflect.Uint64:
u64 := val.Uint()
// If ec.MinSize or if encodeToMinSize is true for a non-uint64 value we should write val as an int32
useMinSize := ec.MinSize || (uic.EncodeToMinSize && val.Kind() != reflect.Uint64)
if u64 <= math.MaxInt32 && useMinSize {
return vw.WriteInt32(int32(u64))
}
if u64 > math.MaxInt64 {
return fmt.Errorf("%d overflows int64", u64)
}
return vw.WriteInt64(int64(u64))
}
return ValueEncoderError{
Name: "UintEncodeValue",
Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint},
Received: val,
}
}
func (uic *UIntCodec) decodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
var i64 int64
var err error
switch vrType := vr.Type(); vrType {
case bsontype.Int32:
i32, err := vr.ReadInt32()
if err != nil {
return emptyValue, err
}
i64 = int64(i32)
case bsontype.Int64:
i64, err = vr.ReadInt64()
if err != nil {
return emptyValue, err
}
case bsontype.Double:
f64, err := vr.ReadDouble()
if err != nil {
return emptyValue, err
}
if !dc.Truncate && math.Floor(f64) != f64 {
return emptyValue, errCannotTruncate
}
if f64 > float64(math.MaxInt64) {
return emptyValue, fmt.Errorf("%g overflows int64", f64)
}
i64 = int64(f64)
case bsontype.Boolean:
b, err := vr.ReadBoolean()
if err != nil {
return emptyValue, err
}
if b {
i64 = 1
}
case bsontype.Null:
if err = vr.ReadNull(); err != nil {
return emptyValue, err
}
case bsontype.Undefined:
if err = vr.ReadUndefined(); err != nil {
return emptyValue, err
}
default:
return emptyValue, fmt.Errorf("cannot decode %v into an integer type", vrType)
}
switch t.Kind() {
case reflect.Uint8:
if i64 < 0 || i64 > math.MaxUint8 {
return emptyValue, fmt.Errorf("%d overflows uint8", i64)
}
return reflect.ValueOf(uint8(i64)), nil
case reflect.Uint16:
if i64 < 0 || i64 > math.MaxUint16 {
return emptyValue, fmt.Errorf("%d overflows uint16", i64)
}
return reflect.ValueOf(uint16(i64)), nil
case reflect.Uint32:
if i64 < 0 || i64 > math.MaxUint32 {
return emptyValue, fmt.Errorf("%d overflows uint32", i64)
}
return reflect.ValueOf(uint32(i64)), nil
case reflect.Uint64:
if i64 < 0 {
return emptyValue, fmt.Errorf("%d overflows uint64", i64)
}
return reflect.ValueOf(uint64(i64)), nil
case reflect.Uint:
if i64 < 0 || int64(uint(i64)) != i64 { // Can we fit this inside of an uint
return emptyValue, fmt.Errorf("%d overflows uint", i64)
}
return reflect.ValueOf(uint(i64)), nil
default:
return emptyValue, ValueDecoderError{
Name: "UintDecodeValue",
Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint},
Received: reflect.Zero(t),
}
}
}
// DecodeValue is the ValueDecoder for uint types.
func (uic *UIntCodec) DecodeValue(dc DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
if !val.CanSet() {
return ValueDecoderError{
Name: "UintDecodeValue",
Kinds: []reflect.Kind{reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint},
Received: val,
}
}
elem, err := uic.decodeType(dc, vr, val.Type())
if err != nil {
return err
}
val.SetUint(elem.Uint())
return nil
}
|
