mirror of https://github.com/jackc/pgx.git
141 lines
2.6 KiB
Go
141 lines
2.6 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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"reflect"
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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 Bytea:
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*dst = value
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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 v := dst.(type) {
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case *[]byte:
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if src.Status == Present {
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*v = src.Bytes
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} else {
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*v = nil
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}
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default:
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if v := reflect.ValueOf(dst); v.Kind() == reflect.Ptr {
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el := v.Elem()
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switch el.Kind() {
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// if dst is a pointer to pointer, strip the pointer and try again
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case reflect.Ptr:
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if src.Status == Null {
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el.Set(reflect.Zero(el.Type()))
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return nil
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}
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if el.IsNil() {
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// allocate destination
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el.Set(reflect.New(el.Type().Elem()))
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}
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return src.AssignTo(el.Interface())
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default:
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if originalDst, ok := underlyingPtrSliceType(dst); ok {
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return src.AssignTo(originalDst)
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}
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}
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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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return nil
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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(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(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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*dst = Bytea{Bytes: src, Status: Present}
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return nil
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}
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func (src Bytea) EncodeText(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(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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