Merge pull request #52753 from munnerz/sample-controller

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

sample-controller: add example CRD controller

**What this PR does / why we need it**:

Adds a sample-controller example repository

fixes #52752

**Special notes for your reviewer**:

This is currently based on the sttts:sttts-codegen-scripts branch and should not be merged until that is (ref https://github.com/kubernetes/kubernetes/pull/52186)

**Release note**:

```
Add sample-controller repository
```

/cc @sttts @nikhita @colemickens

Kubernetes-commit: 9a7800f7d2efb88b397674672ac56f898826cf7c

vendor/github.com/json-iterator/go/feature_reflect_array.go

@@ -0,0 +1,99 @@
+package jsoniter
+
+import (
+	"fmt"
+	"io"
+	"reflect"
+	"unsafe"
+)
+
+func decoderOfArray(cfg *frozenConfig, typ reflect.Type) (ValDecoder, error) {
+	decoder, err := decoderOfType(cfg, typ.Elem())
+	if err != nil {
+		return nil, err
+	}
+	return &arrayDecoder{typ, typ.Elem(), decoder}, nil
+}
+
+func encoderOfArray(cfg *frozenConfig, typ reflect.Type) (ValEncoder, error) {
+	encoder, err := encoderOfType(cfg, typ.Elem())
+	if err != nil {
+		return nil, err
+	}
+	if typ.Elem().Kind() == reflect.Map {
+		encoder = &optionalEncoder{encoder}
+	}
+	return &arrayEncoder{typ, typ.Elem(), encoder}, nil
+}
+
+type arrayEncoder struct {
+	arrayType   reflect.Type
+	elemType    reflect.Type
+	elemEncoder ValEncoder
+}
+
+func (encoder *arrayEncoder) Encode(ptr unsafe.Pointer, stream *Stream) {
+	stream.WriteArrayStart()
+	elemPtr := unsafe.Pointer(ptr)
+	encoder.elemEncoder.Encode(elemPtr, stream)
+	for i := 1; i < encoder.arrayType.Len(); i++ {
+		stream.WriteMore()
+		elemPtr = unsafe.Pointer(uintptr(elemPtr) + encoder.elemType.Size())
+		encoder.elemEncoder.Encode(unsafe.Pointer(elemPtr), stream)
+	}
+	stream.WriteArrayEnd()
+	if stream.Error != nil && stream.Error != io.EOF {
+		stream.Error = fmt.Errorf("%v: %s", encoder.arrayType, stream.Error.Error())
+	}
+}
+
+func (encoder *arrayEncoder) EncodeInterface(val interface{}, stream *Stream) {
+	// special optimization for interface{}
+	e := (*emptyInterface)(unsafe.Pointer(&val))
+	if e.word == nil {
+		stream.WriteArrayStart()
+		stream.WriteNil()
+		stream.WriteArrayEnd()
+		return
+	}
+	elemType := encoder.arrayType.Elem()
+	if encoder.arrayType.Len() == 1 && (elemType.Kind() == reflect.Ptr || elemType.Kind() == reflect.Map) {
+		ptr := uintptr(e.word)
+		e.word = unsafe.Pointer(&ptr)
+	}
+	if reflect.TypeOf(val).Kind() == reflect.Ptr {
+		encoder.Encode(unsafe.Pointer(&e.word), stream)
+	} else {
+		encoder.Encode(e.word, stream)
+	}
+}
+
+func (encoder *arrayEncoder) IsEmpty(ptr unsafe.Pointer) bool {
+	return false
+}
+
+type arrayDecoder struct {
+	arrayType   reflect.Type
+	elemType    reflect.Type
+	elemDecoder ValDecoder
+}
+
+func (decoder *arrayDecoder) Decode(ptr unsafe.Pointer, iter *Iterator) {
+	decoder.doDecode(ptr, iter)
+	if iter.Error != nil && iter.Error != io.EOF {
+		iter.Error = fmt.Errorf("%v: %s", decoder.arrayType, iter.Error.Error())
+	}
+}
+
+func (decoder *arrayDecoder) doDecode(ptr unsafe.Pointer, iter *Iterator) {
+	offset := uintptr(0)
+	iter.ReadArrayCB(func(iter *Iterator) bool {
+		if offset < decoder.arrayType.Size() {
+			decoder.elemDecoder.Decode(unsafe.Pointer(uintptr(ptr)+offset), iter)
+			offset += decoder.elemType.Size()
+		} else {
+			iter.Skip()
+		}
+		return true
+	})
+}