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uni_modules/x-base64toarraybuff-s/utssdk/app-harmony/index.uts

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+import { util } from "@kit.ArkTS";
+import { BusinessError } from "@kit.BasicServicesKit";
+
+/**
+ * 将base64数据转换为arraybuffer
+ * @param data base64数据
+ * @returns Promise<ArrayBuffer>
+ */
+function btoa_x(data: string): ArrayBuffer {
+  const base64 = new util.Base64Helper();
+  const dataSplit = data.split(",");
+  const uint8Array = base64.decodeSync(dataSplit.length > 1 ? data.split(",")[1] : data);
+  const buffer: ArrayBuffer = uint8Array.buffer.slice(0, uint8Array.byteLength);
+
+  return buffer
+}
+
+function  atob_x(data:ArrayBuffer){
+  const base64 = new util.Base64Helper();
+  const unit8data = new Uint8Array(data)
+  return base64.encodeToStringSync(unit8data)
+}
+
+export const base64ToArrayBuffer = (data : string) :ArrayBuffer => {
+	try {
+		return btoa_x(data)
+	} catch (error) {
+		const e = error as BusinessError;
+		console.error("TMUI",e.message)
+		return new ArrayBuffer(0)
+	}
+}
+
+export const arrayBufferToBase64 = (data : ArrayBuffer) : string => {
+	try {
+		return atob_x(data)
+	} catch (error) {
+		const e = error as BusinessError;
+		console.error("TMUI",e.message)
+		return ''
+	}
+}