chore: 并入 iotlcm-openapi 历史到 openapi/（原提交 3b05d5a）

openapi/utility/hash/sum16.go

@@ -0,0 +1,31 @@
+package hash
+
+import "os"
+
+func Sum16ChecksumData(bs []byte) uint16 {
+	sum := uint16(0)
+	for _, b := range bs {
+		sum += uint16(b)
+	}
+	return sum
+}
+
+func Sum16ChecksumFile(filePath string) uint16 {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return 0
+	}
+	defer file.Close()
+	// 分块读取
+	blockSize := 1024 * 1024
+	buf := make([]byte, blockSize)
+	sum := uint16(0)
+	for {
+		n, err := file.Read(buf)
+		if err != nil {
+			break
+		}
+		sum += Sum16ChecksumData(buf[:n])
+	}
+	return sum
+}