Initial QSfera import

Server/vendor/github.com/segmentio/kafka-go/sizeof.go

@@ -0,0 +1,72 @@
+package kafka
+
+import "fmt"
+
+type sizable interface {
+	size() int32
+}
+
+func sizeof(a interface{}) int32 {
+	switch v := a.(type) {
+	case int8:
+		return 1
+	case int16:
+		return 2
+	case int32:
+		return 4
+	case int64:
+		return 8
+	case string:
+		return sizeofString(v)
+	case bool:
+		return 1
+	case []byte:
+		return sizeofBytes(v)
+	case sizable:
+		return v.size()
+	}
+	panic(fmt.Sprintf("unsupported type: %T", a))
+}
+
+func sizeofInt16(_ int16) int32 {
+	return 2
+}
+
+func sizeofInt32(_ int32) int32 {
+	return 4
+}
+
+func sizeofInt64(_ int64) int32 {
+	return 8
+}
+
+func sizeofString(s string) int32 {
+	return 2 + int32(len(s))
+}
+
+func sizeofNullableString(s *string) int32 {
+	if s == nil {
+		return 2
+	}
+	return sizeofString(*s)
+}
+
+func sizeofBytes(b []byte) int32 {
+	return 4 + int32(len(b))
+}
+
+func sizeofArray(n int, f func(int) int32) int32 {
+	s := int32(4)
+	for i := 0; i != n; i++ {
+		s += f(i)
+	}
+	return s
+}
+
+func sizeofInt32Array(a []int32) int32 {
+	return 4 + (4 * int32(len(a)))
+}
+
+func sizeofStringArray(a []string) int32 {
+	return sizeofArray(len(a), func(i int) int32 { return sizeofString(a[i]) })
+}