add wav

examples/gno.land/p/demo/wav/wav.gno

@@ -0,0 +1,32 @@
+package wav
+
+import (
+	"encoding/binary"
+	"io"
+)
+
+type Writer struct {
+	io.Writer
+}
+
+type writeCallback func(w io.Writer)
+
+func NewWriter(w io.Writer, fileType []byte, fileSize uint32) *Writer {
+	w.Write([]byte("RIFF"))
+	binary.Write(w, binary.LittleEndian, fileSize)
+	w.Write(fileType)
+	return &Writer{w}
+}
+
+func (w *Writer) WriteChunk(chunkID []byte, chunkSize uint32, cb writeCallback) (err error) {
+	_, err = w.Write(chunkID)
+	if err != nil {
+		return
+	}
+	err = binary.Write(w, binary.LittleEndian, chunkSize)
+	if err != nil {
+		return
+	}
+	cb(w)
+	return
+}

examples/gno.land/p/demo/wav/wav_test.gno

@@ -0,0 +1,15 @@
+package wav
+
+import (
+	"bufio"
+	"bytes"
+	"testing"
+)
+
+func TestWav(t *testing.T) {
+	var buf bytes.Buffer
+	w := NewWriter(bufio.NewWriter(&buf), []byte("wav"), 100)
+	if w == nil {
+		t.Errorf("could not make")
+	}
+}