Update

vendor/github.com/klauspost/compress/zstd/decoder.go

@@ -39,9 +39,6 @@ type Decoder struct {
 
 	frame *frameDec
 
-	// Custom dictionaries.
-	dicts map[uint32]*dict
-
 	// streamWg is the waitgroup for all streams
 	streamWg sync.WaitGroup
 }
@@ -101,12 +98,10 @@ func NewReader(r io.Reader, opts ...DOption) (*Decoder, error) {
 		d.current.err = ErrDecoderNilInput
 	}
 
-	// Transfer option dicts.
-	d.dicts = make(map[uint32]*dict, len(d.o.dicts))
-	for _, dc := range d.o.dicts {
-		d.dicts[dc.id] = dc
+	// Initialize dict map if needed.
+	if d.o.dicts == nil {
+		d.o.dicts = make(map[uint32]*dict)
 	}
-	d.o.dicts = nil
 
 	// Create decoders
 	d.decoders = make(chan *blockDec, d.o.concurrent)
@@ -238,6 +233,21 @@ func (d *Decoder) Reset(r io.Reader) error {
 	return nil
 }
 
+// ResetWithOptions will reset the decoder and apply the given options
+// for the next stream or DecodeAll operation.
+// Options are applied on top of the existing options.
+// Some options cannot be changed on reset and will return an error.
+func (d *Decoder) ResetWithOptions(r io.Reader, opts ...DOption) error {
+	d.o.resetOpt = true
+	defer func() { d.o.resetOpt = false }()
+	for _, o := range opts {
+		if err := o(&d.o); err != nil {
+			return err
+		}
+	}
+	return d.Reset(r)
+}
+
 // drainOutput will drain the output until errEndOfStream is sent.
 func (d *Decoder) drainOutput() {
 	if d.current.cancel != nil {
@@ -930,7 +940,7 @@ decodeStream:
 }
 
 func (d *Decoder) setDict(frame *frameDec) (err error) {
-	dict, ok := d.dicts[frame.DictionaryID]
+	dict, ok := d.o.dicts[frame.DictionaryID]
 	if ok {
 		if debugDecoder {
 			println("setting dict", frame.DictionaryID)