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|
package decoder
import (
"encoding/base64"
"unsafe"
"github.com/goccy/go-json/internal/errors"
"github.com/goccy/go-json/internal/runtime"
)
type bytesDecoder struct {
typ *runtime.Type
sliceDecoder Decoder
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)
}
if unmarshalDecoder == nil {
return nil
}
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),
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 binaryBytes(s *Stream) ([]byte, error) {
s.cursor++
start := s.cursor
for {
switch s.char() {
case '"':
literal := s.buf[start:s.cursor]
s.cursor++
return literal, nil
case nul:
if s.read() {
continue
}
goto ERROR
}
s.cursor++
}
ERROR:
return nil, errors.ErrUnexpectedEndOfJSON("[]byte", s.totalOffset())
}
func (d *bytesDecoder) decodeStreamBinary(s *Stream, depth int64, p unsafe.Pointer) ([]byte, error) {
for {
switch s.char() {
case ' ', '\n', '\t', '\r':
s.cursor++
continue
case '"':
return binaryBytes(s)
case 'n':
if err := nullBytes(s); err != nil {
return nil, err
}
return nil, nil
case '[':
if d.sliceDecoder == nil {
return nil, &errors.UnmarshalTypeError{
Type: runtime.RType2Type(d.typ),
Offset: s.totalOffset(),
}
}
if err := d.sliceDecoder.DecodeStream(s, depth, p); err != nil {
return nil, err
}
return nil, nil
case nul:
if s.read() {
continue
}
}
break
}
return nil, errors.ErrNotAtBeginningOfValue(s.totalOffset())
}
func (d *bytesDecoder) decodeBinary(ctx *RuntimeContext, cursor, depth int64, p unsafe.Pointer) ([]byte, int64, error) {
buf := ctx.Buf
for {
switch buf[cursor] {
case ' ', '\n', '\t', '\r':
cursor++
case '"':
cursor++
start := cursor
for {
switch buf[cursor] {
case '"':
literal := buf[start:cursor]
cursor++
return literal, cursor, nil
case nul:
return nil, 0, errors.ErrUnexpectedEndOfJSON("[]byte", cursor)
}
cursor++
}
case '[':
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
case 'n':
if err := validateNull(buf, cursor); err != nil {
return nil, 0, err
}
cursor += 4
return nil, cursor, nil
default:
return nil, 0, errors.ErrNotAtBeginningOfValue(cursor)
}
}
}
|
