mirror of https://github.com/goccy/go-json.git
83 lines
1.7 KiB
Go
83 lines
1.7 KiB
Go
package json
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import (
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"unsafe"
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)
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type ptrDecoder struct {
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dec decoder
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typ *rtype
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structName string
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fieldName string
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}
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func newPtrDecoder(dec decoder, typ *rtype, structName, fieldName string) *ptrDecoder {
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return &ptrDecoder{
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dec: dec,
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typ: typ,
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structName: structName,
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fieldName: fieldName,
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}
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}
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func (d *ptrDecoder) contentDecoder() decoder {
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dec, ok := d.dec.(*ptrDecoder)
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if !ok {
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return d.dec
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}
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return dec.contentDecoder()
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}
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//go:linkname unsafe_New reflect.unsafe_New
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func unsafe_New(*rtype) unsafe.Pointer
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func (d *ptrDecoder) decodeStream(s *stream, p unsafe.Pointer) error {
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s.skipWhiteSpace()
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if s.char() == nul {
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s.read()
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}
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if s.char() == 'n' {
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if err := nullBytes(s); err != nil {
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return err
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}
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*(*unsafe.Pointer)(p) = nil
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return nil
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}
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newptr := unsafe_New(d.typ)
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*(*unsafe.Pointer)(p) = newptr
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if err := d.dec.decodeStream(s, newptr); err != nil {
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return err
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}
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return nil
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}
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func (d *ptrDecoder) decode(buf []byte, cursor int64, p unsafe.Pointer) (int64, error) {
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cursor = skipWhiteSpace(buf, cursor)
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if buf[cursor] == 'n' {
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buflen := int64(len(buf))
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if cursor+3 >= buflen {
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return 0, errUnexpectedEndOfJSON("null", cursor)
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}
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if buf[cursor+1] != 'u' {
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return 0, errInvalidCharacter(buf[cursor+1], "null", cursor)
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}
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if buf[cursor+2] != 'l' {
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return 0, errInvalidCharacter(buf[cursor+2], "null", cursor)
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}
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if buf[cursor+3] != 'l' {
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return 0, errInvalidCharacter(buf[cursor+3], "null", cursor)
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}
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*(*unsafe.Pointer)(p) = nil
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cursor += 4
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return cursor, nil
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}
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newptr := unsafe_New(d.typ)
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*(*unsafe.Pointer)(p) = newptr
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c, err := d.dec.decode(buf, cursor, newptr)
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if err != nil {
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return 0, err
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}
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cursor = c
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return cursor, nil
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}
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