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
|
package pgproto3
import (
"bytes"
"encoding/binary"
"encoding/json"
"errors"
"github.com/jackc/pgx/v5/internal/pgio"
)
type CopyOutResponse struct {
OverallFormat byte
ColumnFormatCodes []uint16
}
func (*CopyOutResponse) Backend() {}
// Decode decodes src into dst. src must contain the complete message with the exception of the initial 1 byte message
// type identifier and 4 byte message length.
func (dst *CopyOutResponse) Decode(src []byte) error {
buf := bytes.NewBuffer(src)
if buf.Len() < 3 {
return &invalidMessageFormatErr{messageType: "CopyOutResponse"}
}
overallFormat := buf.Next(1)[0]
columnCount := int(binary.BigEndian.Uint16(buf.Next(2)))
if buf.Len() != columnCount*2 {
return &invalidMessageFormatErr{messageType: "CopyOutResponse"}
}
columnFormatCodes := make([]uint16, columnCount)
for i := 0; i < columnCount; i++ {
columnFormatCodes[i] = binary.BigEndian.Uint16(buf.Next(2))
}
*dst = CopyOutResponse{OverallFormat: overallFormat, ColumnFormatCodes: columnFormatCodes}
return nil
}
// Encode encodes src into dst. dst will include the 1 byte message type identifier and the 4 byte message length.
func (src *CopyOutResponse) Encode(dst []byte) []byte {
dst = append(dst, 'H')
sp := len(dst)
dst = pgio.AppendInt32(dst, -1)
dst = append(dst, src.OverallFormat)
dst = pgio.AppendUint16(dst, uint16(len(src.ColumnFormatCodes)))
for _, fc := range src.ColumnFormatCodes {
dst = pgio.AppendUint16(dst, fc)
}
pgio.SetInt32(dst[sp:], int32(len(dst[sp:])))
return dst
}
// MarshalJSON implements encoding/json.Marshaler.
func (src CopyOutResponse) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
Type string
ColumnFormatCodes []uint16
}{
Type: "CopyOutResponse",
ColumnFormatCodes: src.ColumnFormatCodes,
})
}
// UnmarshalJSON implements encoding/json.Unmarshaler.
func (dst *CopyOutResponse) UnmarshalJSON(data []byte) error {
// Ignore null, like in the main JSON package.
if string(data) == "null" {
return nil
}
var msg struct {
OverallFormat string
ColumnFormatCodes []uint16
}
if err := json.Unmarshal(data, &msg); err != nil {
return err
}
if len(msg.OverallFormat) != 1 {
return errors.New("invalid length for CopyOutResponse.OverallFormat")
}
dst.OverallFormat = msg.OverallFormat[0]
dst.ColumnFormatCodes = msg.ColumnFormatCodes
return nil
}
|
