mirror of https://github.com/jackc/pgx.git
61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
package pgproto3
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import (
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"bytes"
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"encoding/binary"
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"encoding/json"
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)
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type ParameterDescription struct {
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ParameterOIDs []uint32
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}
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func (*ParameterDescription) Backend() {}
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func (dst *ParameterDescription) UnmarshalBinary(src []byte) error {
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buf := bytes.NewBuffer(src)
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if buf.Len() < 2 {
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return &invalidMessageFormatErr{messageType: "ParameterDescription"}
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}
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// Reported parameter count will be incorrect when number of args is greater than uint16
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buf.Next(2)
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// Instead infer parameter count by remaining size of message
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parameterCount := buf.Len() / 4
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*dst = ParameterDescription{ParameterOIDs: make([]uint32, parameterCount)}
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for i := 0; i < parameterCount; i++ {
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dst.ParameterOIDs[i] = binary.BigEndian.Uint32(buf.Next(4))
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}
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return nil
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}
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func (src *ParameterDescription) MarshalBinary() ([]byte, error) {
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var bigEndian BigEndianBuf
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buf := &bytes.Buffer{}
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buf.WriteByte('t')
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buf.Write(bigEndian.Uint32(uint32(4 + 2 + 4*len(src.ParameterOIDs))))
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buf.Write(bigEndian.Uint16(uint16(len(src.ParameterOIDs))))
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for _, oid := range src.ParameterOIDs {
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buf.Write(bigEndian.Uint32(oid))
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}
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return buf.Bytes(), nil
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}
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func (src *ParameterDescription) MarshalJSON() ([]byte, error) {
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return json.Marshal(struct {
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Type string
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ParameterOIDs []uint32
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}{
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Type: "ParameterDescription",
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ParameterOIDs: src.ParameterOIDs,
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})
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}
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