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package decoder
import (
"encoding/base64"
"fmt"
"unsafe"
"github.com/goccy/go-json/internal/errors"
"github.com/goccy/go-json/internal/runtime"
)
type bytesDecoder struct {
typ *runtime.Type
sliceDecoder Decoder
stringDecoder *stringDecoder
structName string
fieldName string
}
func byteUnmarshalerSliceDecoder(typ *runtime.Type, structName string, fieldName string) Decoder {
var unmarshalDecoder Decoder
switch {
case runtime.PtrTo(typ).Implements(unmarshalJSONType):
unmarshalDecoder = newUnmarshalJSONDecoder(runtime.PtrTo(typ), structName, fieldName)
case runtime.PtrTo(typ).Implements(unmarshalTextType):
unmarshalDecoder = newUnmarshalTextDecoder(runtime.PtrTo(typ), structName, fieldName)
default:
unmarshalDecoder, _ = compileUint8(typ, structName, fieldName)
}
return newSliceDecoder(unmarshalDecoder, typ, 1, structName, fieldName)
}
func newBytesDecoder(typ *runtime.Type, structName string, fieldName string) *bytesDecoder {
return &bytesDecoder{
typ: typ,
sliceDecoder: byteUnmarshalerSliceDecoder(typ, structName, fieldName),
stringDecoder: newStringDecoder(structName, fieldName),
structName: structName,
fieldName: fieldName,
}
}
func (d *bytesDecoder) DecodeStream(s *Stream, depth int64, p unsafe.Pointer) error {
bytes, err := d.decodeStreamBinary(s, depth, p)
if err != nil {
return err
}
if bytes == nil {
s.reset()
return nil
}
decodedLen := base64.StdEncoding.DecodedLen(len(bytes))
buf := make([]byte, decodedLen)
n, err := base64.StdEncoding.Decode(buf, bytes)
if err != nil {
return err
}
*(*[]byte)(p) = buf[:n]
s.reset()
return nil
}
func (d *bytesDecoder) Decode(ctx *RuntimeContext, cursor, depth int64, p unsafe.Pointer) (int64, error) {
bytes, c, err := d.decodeBinary(ctx, cursor, depth, p)
if err != nil {
return 0, err
}
if bytes == nil {
return c, nil
}
cursor = c
decodedLen := base64.StdEncoding.DecodedLen(len(bytes))
b := make([]byte, decodedLen)
n, err := base64.StdEncoding.Decode(b, bytes)
if err != nil {
return 0, err
}
*(*[]byte)(p) = b[:n]
return cursor, nil
}
func (d *bytesDecoder) DecodePath(ctx *RuntimeContext, cursor, depth int64) ([][]byte, int64, error) {
return nil, 0, fmt.Errorf("json: []byte decoder does not support decode path")
}
func (d *bytesDecoder) decodeStreamBinary(s *Stream, depth int64, p unsafe.Pointer) ([]byte, error) {
c := s.skipWhiteSpace()
if c == '[' {
if d.sliceDecoder == nil {
return nil, &errors.UnmarshalTypeError{
Type: runtime.RType2Type(d.typ),
Offset: s.totalOffset(),
}
}
err := d.sliceDecoder.DecodeStream(s, depth, p)
return nil, err
}
return d.stringDecoder.decodeStreamByte(s)
}
func (d *bytesDecoder) decodeBinary(ctx *RuntimeContext, cursor, depth int64, p unsafe.Pointer) ([]byte, int64, error) {
buf := ctx.Buf
cursor = skipWhiteSpace(buf, cursor)
if buf[cursor] == '[' {
if d.sliceDecoder == nil {
return nil, 0, &errors.UnmarshalTypeError{
Type: runtime.RType2Type(d.typ),
Offset: cursor,
}
}
c, err := d.sliceDecoder.Decode(ctx, cursor, depth, p)
if err != nil {
return nil, 0, err
}
return nil, c, nil
}
return d.stringDecoder.decodeByte(buf, cursor)
}
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