147 lines
2.9 KiB
Go
147 lines
2.9 KiB
Go
package json
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import (
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"unsafe"
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)
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type arrayDecoder struct {
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elemType *rtype
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size uintptr
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valueDecoder decoder
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alen int
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structName string
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fieldName string
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zeroValue unsafe.Pointer
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}
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func newArrayDecoder(dec decoder, elemType *rtype, alen int, structName, fieldName string) *arrayDecoder {
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zeroValue := *(*unsafe.Pointer)(unsafe_New(elemType))
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return &arrayDecoder{
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valueDecoder: dec,
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elemType: elemType,
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size: elemType.Size(),
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alen: alen,
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structName: structName,
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fieldName: fieldName,
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zeroValue: zeroValue,
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}
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}
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func (d *arrayDecoder) decodeStream(s *stream, depth int64, p unsafe.Pointer) error {
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depth++
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if depth > maxDecodeNestingDepth {
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return errExceededMaxDepth(s.char(), s.cursor)
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}
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for {
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switch s.char() {
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case ' ', '\n', '\t', '\r':
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case '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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return nil
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case '[':
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idx := 0
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for {
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s.cursor++
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if idx < d.alen {
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if err := d.valueDecoder.decodeStream(s, depth, unsafe.Pointer(uintptr(p)+uintptr(idx)*d.size)); err != nil {
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return err
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}
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} else {
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if err := s.skipValue(depth); err != nil {
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return err
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}
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}
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idx++
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s.skipWhiteSpace()
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switch s.char() {
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case ']':
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for idx < d.alen {
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*(*unsafe.Pointer)(unsafe.Pointer(uintptr(p) + uintptr(idx)*d.size)) = d.zeroValue
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idx++
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}
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s.cursor++
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return nil
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case ',':
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continue
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case nul:
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if s.read() {
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continue
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}
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goto ERROR
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default:
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goto ERROR
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}
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}
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case nul:
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if s.read() {
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continue
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}
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goto ERROR
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default:
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goto ERROR
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}
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s.cursor++
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}
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ERROR:
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return errUnexpectedEndOfJSON("array", s.totalOffset())
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}
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func (d *arrayDecoder) decode(buf []byte, cursor, depth int64, p unsafe.Pointer) (int64, error) {
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depth++
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if depth > maxDecodeNestingDepth {
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return 0, errExceededMaxDepth(buf[cursor], cursor)
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}
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for {
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switch buf[cursor] {
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case ' ', '\n', '\t', '\r':
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cursor++
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continue
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case 'n':
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if err := validateNull(buf, cursor); err != nil {
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return 0, err
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}
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cursor += 4
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return cursor, nil
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case '[':
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idx := 0
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for {
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cursor++
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if idx < d.alen {
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c, err := d.valueDecoder.decode(buf, cursor, depth, unsafe.Pointer(uintptr(p)+uintptr(idx)*d.size))
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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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} else {
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c, err := skipValue(buf, cursor, depth)
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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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}
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idx++
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cursor = skipWhiteSpace(buf, cursor)
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switch buf[cursor] {
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case ']':
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for idx < d.alen {
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*(*unsafe.Pointer)(unsafe.Pointer(uintptr(p) + uintptr(idx)*d.size)) = d.zeroValue
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idx++
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}
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cursor++
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return cursor, nil
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case ',':
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continue
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default:
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return 0, errInvalidCharacter(buf[cursor], "array", cursor)
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}
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}
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default:
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return 0, errUnexpectedEndOfJSON("array", cursor)
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}
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}
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}
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