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package coding
import (
"bytes"
"io"
"io/fs"
"github.com/dromara/dongle/internal/utils"
)
// Encoder defines a Encoder struct.
type Encoder struct {
src []byte
dst []byte
reader io.Reader
Error error
}
// NewEncoder returns a new Encoder instance.
func NewEncoder() Encoder {
return Encoder{}
}
// FromString encodes from string.
func (e Encoder) FromString(s string) Encoder {
e.src = utils.String2Bytes(s)
return e
}
// FromBytes encodes from byte slice.
func (e Encoder) FromBytes(b []byte) Encoder {
e.src = b
return e
}
// FromFile encodes from file.
func (e Encoder) FromFile(f fs.File) Encoder {
e.reader = f
return e
}
// ToString outputs as string.
func (e Encoder) ToString() string {
if len(e.dst) == 0 || e.Error != nil {
return ""
}
return utils.Bytes2String(e.dst)
}
// ToBytes outputs as byte slice.
func (e Encoder) ToBytes() []byte {
if len(e.dst) == 0 || e.Error != nil {
return []byte{}
}
return e.dst
}
func (e Encoder) stream(fn func(io.Writer) io.WriteCloser) ([]byte, error) {
var buf bytes.Buffer
encoder := fn(&buf)
// Try to reset the reader position if it's a seeker
if seeker, ok := e.reader.(io.Seeker); ok {
seeker.Seek(0, io.SeekStart)
}
if _, err := io.CopyBuffer(encoder, e.reader, make([]byte, BufferSize)); err != nil && err != io.EOF {
encoder.Close()
return []byte{}, err
}
if err := encoder.Close(); err != nil {
return []byte{}, err
}
if buf.Len() == 0 {
return []byte{}, nil
}
return buf.Bytes(), nil
}
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