mirror of https://github.com/jackc/pgx.git
127 lines
2.3 KiB
Go
127 lines
2.3 KiB
Go
package pgtype
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import (
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"encoding/hex"
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"fmt"
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"io"
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)
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type Bytea struct {
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Bytes []byte
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Status Status
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}
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func (dst *Bytea) Set(src interface{}) error {
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switch value := src.(type) {
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case []byte:
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if value != nil {
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*dst = Bytea{Bytes: value, Status: Present}
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} else {
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*dst = Bytea{Status: Null}
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}
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default:
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if originalSrc, ok := underlyingBytesType(src); ok {
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return dst.Set(originalSrc)
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}
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return fmt.Errorf("cannot convert %v to Bytea", value)
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}
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return nil
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}
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func (dst *Bytea) Get() interface{} {
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switch dst.Status {
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case Present:
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return dst.Bytes
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case Null:
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return nil
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default:
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return dst.Status
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}
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}
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func (src *Bytea) AssignTo(dst interface{}) error {
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switch src.Status {
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case Present:
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switch v := dst.(type) {
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case *[]byte:
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buf := make([]byte, len(src.Bytes))
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copy(buf, src.Bytes)
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*v = buf
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return nil
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default:
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if nextDst, retry := GetAssignToDstType(dst); retry {
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return src.AssignTo(nextDst)
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}
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}
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case Null:
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return nullAssignTo(dst)
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}
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return fmt.Errorf("cannot decode %v into %T", src, dst)
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}
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// DecodeText only supports the hex format. This has been the default since
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// PostgreSQL 9.0.
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func (dst *Bytea) DecodeText(ci *ConnInfo, src []byte) error {
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if src == nil {
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*dst = Bytea{Status: Null}
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return nil
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}
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if len(src) < 2 || src[0] != '\\' || src[1] != 'x' {
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return fmt.Errorf("invalid hex format")
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}
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buf := make([]byte, (len(src)-2)/2)
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_, err := hex.Decode(buf, src[2:])
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if err != nil {
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return err
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}
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*dst = Bytea{Bytes: buf, Status: Present}
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return nil
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}
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func (dst *Bytea) DecodeBinary(ci *ConnInfo, src []byte) error {
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if src == nil {
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*dst = Bytea{Status: Null}
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return nil
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}
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buf := make([]byte, len(src))
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copy(buf, src)
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*dst = Bytea{Bytes: buf, Status: Present}
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return nil
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}
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func (src Bytea) EncodeText(ci *ConnInfo, w io.Writer) (bool, error) {
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switch src.Status {
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case Null:
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return true, nil
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case Undefined:
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return false, errUndefined
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}
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_, err := io.WriteString(w, `\x`)
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if err != nil {
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return false, err
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}
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_, err = io.WriteString(w, hex.EncodeToString(src.Bytes))
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return false, err
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}
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func (src Bytea) EncodeBinary(ci *ConnInfo, w io.Writer) (bool, error) {
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switch src.Status {
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case Null:
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return true, nil
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case Undefined:
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return false, errUndefined
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}
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_, err := w.Write(src.Bytes)
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return false, err
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}
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