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