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|
package pgtype
import (
"database/sql/driver"
"encoding/hex"
"fmt"
)
type Bytea struct {
Bytes []byte
Status Status
}
func (dst *Bytea) Set(src interface{}) error {
if src == nil {
*dst = Bytea{Status: Null}
return nil
}
if value, ok := src.(interface{ Get() interface{} }); ok {
value2 := value.Get()
if value2 != value {
return dst.Set(value2)
}
}
switch value := src.(type) {
case []byte:
if value != nil {
*dst = Bytea{Bytes: value, Status: Present}
} else {
*dst = Bytea{Status: Null}
}
default:
if originalSrc, ok := underlyingBytesType(src); ok {
return dst.Set(originalSrc)
}
return fmt.Errorf("cannot convert %v to Bytea", value)
}
return nil
}
func (dst Bytea) Get() interface{} {
switch dst.Status {
case Present:
return dst.Bytes
case Null:
return nil
default:
return dst.Status
}
}
func (src *Bytea) AssignTo(dst interface{}) error {
switch src.Status {
case Present:
switch v := dst.(type) {
case *[]byte:
buf := make([]byte, len(src.Bytes))
copy(buf, src.Bytes)
*v = buf
return nil
default:
if nextDst, retry := GetAssignToDstType(dst); retry {
return src.AssignTo(nextDst)
}
return fmt.Errorf("unable to assign to %T", dst)
}
case Null:
return NullAssignTo(dst)
}
return fmt.Errorf("cannot decode %#v into %T", src, dst)
}
// DecodeText only supports the hex format. This has been the default since
// PostgreSQL 9.0.
func (dst *Bytea) DecodeText(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = Bytea{Status: Null}
return nil
}
if len(src) < 2 || src[0] != '\\' || src[1] != 'x' {
return fmt.Errorf("invalid hex format")
}
buf := make([]byte, (len(src)-2)/2)
_, err := hex.Decode(buf, src[2:])
if err != nil {
return err
}
*dst = Bytea{Bytes: buf, Status: Present}
return nil
}
func (dst *Bytea) DecodeBinary(ci *ConnInfo, src []byte) error {
if src == nil {
*dst = Bytea{Status: Null}
return nil
}
*dst = Bytea{Bytes: src, Status: Present}
return nil
}
func (src Bytea) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
buf = append(buf, `\x`...)
buf = append(buf, hex.EncodeToString(src.Bytes)...)
return buf, nil
}
func (src Bytea) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
switch src.Status {
case Null:
return nil, nil
case Undefined:
return nil, errUndefined
}
return append(buf, src.Bytes...), nil
}
// Scan implements the database/sql Scanner interface.
func (dst *Bytea) Scan(src interface{}) error {
if src == nil {
*dst = Bytea{Status: Null}
return nil
}
switch src := src.(type) {
case string:
return dst.DecodeText(nil, []byte(src))
case []byte:
buf := make([]byte, len(src))
copy(buf, src)
*dst = Bytea{Bytes: buf, Status: Present}
return nil
}
return fmt.Errorf("cannot scan %T", src)
}
// Value implements the database/sql/driver Valuer interface.
func (src Bytea) Value() (driver.Value, error) {
switch src.Status {
case Present:
return src.Bytes, nil
case Null:
return nil, nil
default:
return nil, errUndefined
}
}
|
