mirror of https://github.com/jackc/pgx.git
134 lines
2.5 KiB
Go
134 lines
2.5 KiB
Go
package pgtype
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import (
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"database/sql/driver"
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"encoding/binary"
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"github.com/jackc/pgio"
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errors "golang.org/x/xerrors"
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)
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type Varbit struct {
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Bytes []byte
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Len int32 // Number of bits
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Status Status
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}
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func (dst *Varbit) Set(src interface{}) error {
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return errors.Errorf("cannot convert %v to Varbit", src)
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}
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func (dst *Varbit) Get() interface{} {
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switch dst.Status {
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case Present:
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return dst
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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 *Varbit) AssignTo(dst interface{}) error {
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return errors.Errorf("cannot assign %v to %T", src, dst)
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}
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func (dst *Varbit) DecodeText(ci *ConnInfo, src []byte) error {
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if src == nil {
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*dst = Varbit{Status: Null}
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return nil
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}
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bitLen := len(src)
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byteLen := bitLen / 8
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if bitLen%8 > 0 {
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byteLen++
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}
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buf := make([]byte, byteLen)
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for i, b := range src {
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if b == '1' {
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byteIdx := i / 8
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bitIdx := uint(i % 8)
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buf[byteIdx] = buf[byteIdx] | (128 >> bitIdx)
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}
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}
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*dst = Varbit{Bytes: buf, Len: int32(bitLen), Status: Present}
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return nil
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}
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func (dst *Varbit) DecodeBinary(ci *ConnInfo, src []byte) error {
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if src == nil {
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*dst = Varbit{Status: Null}
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return nil
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}
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if len(src) < 4 {
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return errors.Errorf("invalid length for varbit: %v", len(src))
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}
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bitLen := int32(binary.BigEndian.Uint32(src))
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rp := 4
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*dst = Varbit{Bytes: src[rp:], Len: bitLen, Status: Present}
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return nil
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}
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func (src *Varbit) EncodeText(ci *ConnInfo, buf []byte) ([]byte, error) {
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switch src.Status {
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case Null:
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return nil, nil
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case Undefined:
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return nil, errUndefined
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}
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for i := int32(0); i < src.Len; i++ {
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byteIdx := i / 8
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bitMask := byte(128 >> byte(i%8))
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char := byte('0')
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if src.Bytes[byteIdx]&bitMask > 0 {
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char = '1'
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}
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buf = append(buf, char)
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}
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return buf, nil
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}
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func (src *Varbit) EncodeBinary(ci *ConnInfo, buf []byte) ([]byte, error) {
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switch src.Status {
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case Null:
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return nil, nil
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case Undefined:
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return nil, errUndefined
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}
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buf = pgio.AppendInt32(buf, src.Len)
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return append(buf, src.Bytes...), nil
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}
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// Scan implements the database/sql Scanner interface.
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func (dst *Varbit) Scan(src interface{}) error {
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if src == nil {
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*dst = Varbit{Status: Null}
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return nil
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}
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switch src := src.(type) {
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case string:
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return dst.DecodeText(nil, []byte(src))
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case []byte:
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srcCopy := make([]byte, len(src))
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copy(srcCopy, src)
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return dst.DecodeText(nil, srcCopy)
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}
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return errors.Errorf("cannot scan %T", src)
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}
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// Value implements the database/sql/driver Valuer interface.
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func (src *Varbit) Value() (driver.Value, error) {
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return EncodeValueText(src)
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}
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