mirror of https://github.com/jackc/pgx.git
138 lines
2.5 KiB
Go
138 lines
2.5 KiB
Go
package pgtype
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import (
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"fmt"
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"io"
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"math"
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"strconv"
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"github.com/jackc/pgx/pgio"
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)
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type Int4 int32
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func (i *Int4) Convert(src interface{}) error {
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switch value := src.(type) {
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case Int4:
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*i = value
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case int8:
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*i = Int4(value)
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case uint8:
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*i = Int4(value)
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case int16:
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*i = Int4(value)
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case uint16:
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*i = Int4(value)
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case int32:
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*i = Int4(value)
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case uint32:
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if value > math.MaxInt32 {
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return fmt.Errorf("%d is greater than maximum value for Int4", value)
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}
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*i = Int4(value)
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case int64:
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if value < math.MinInt32 {
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return fmt.Errorf("%d is greater than maximum value for Int4", value)
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}
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if value > math.MaxInt32 {
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return fmt.Errorf("%d is greater than maximum value for Int4", value)
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}
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*i = Int4(value)
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case uint64:
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if value > math.MaxInt32 {
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return fmt.Errorf("%d is greater than maximum value for Int4", value)
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}
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*i = Int4(value)
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case int:
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if value < math.MinInt32 {
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return fmt.Errorf("%d is greater than maximum value for Int4", value)
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}
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if value > math.MaxInt32 {
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return fmt.Errorf("%d is greater than maximum value for Int4", value)
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}
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*i = Int4(value)
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case uint:
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if value > math.MaxInt32 {
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return fmt.Errorf("%d is greater than maximum value for Int4", value)
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}
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*i = Int4(value)
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case string:
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num, err := strconv.ParseInt(value, 10, 32)
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if err != nil {
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return err
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}
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*i = Int4(num)
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default:
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if originalSrc, ok := underlyingIntType(src); ok {
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return i.Convert(originalSrc)
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}
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return fmt.Errorf("cannot convert %v to Int8", value)
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}
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return nil
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}
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func (i *Int4) DecodeText(r io.Reader) error {
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size, err := pgio.ReadInt32(r)
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if err != nil {
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return err
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}
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if size == -1 {
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return fmt.Errorf("invalid length for int4: %v", size)
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}
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buf := make([]byte, int(size))
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_, err = r.Read(buf)
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if err != nil {
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return err
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}
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n, err := strconv.ParseInt(string(buf), 10, 32)
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if err != nil {
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return err
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}
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*i = Int4(n)
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return nil
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}
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func (i *Int4) DecodeBinary(r io.Reader) error {
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size, err := pgio.ReadInt32(r)
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if err != nil {
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return err
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}
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if size != 4 {
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return fmt.Errorf("invalid length for int4: %v", size)
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}
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n, err := pgio.ReadInt32(r)
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if err != nil {
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return err
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}
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*i = Int4(n)
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return nil
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}
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func (i Int4) EncodeText(w io.Writer) error {
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s := strconv.FormatInt(int64(i), 10)
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_, err := pgio.WriteInt32(w, int32(len(s)))
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if err != nil {
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return nil
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}
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_, err = w.Write([]byte(s))
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return err
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}
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func (i Int4) EncodeBinary(w io.Writer) error {
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_, err := pgio.WriteInt32(w, 4)
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if err != nil {
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return err
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}
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_, err = pgio.WriteInt32(w, int32(i))
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return err
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}
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