web_lib

Common web application libraries
git clone https://radroots.dev/git/web_lib.git
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messages.ts (1298B)

      1 import { err_msg, type ResolveErrorMsg } from "@radroots/utils";
      2 import { BLE_ERROR, type BleErrorMessage } from "./error.js";
      3 import type { BleMessageEncoding, BleMessageInput } from "./types.js";
      4 
      5 export const ble_message_bytes = (value: BleMessageInput): ResolveErrorMsg<Uint8Array, BleErrorMessage> => {
      6     if (typeof value === "string") {
      7         if (typeof TextEncoder === "undefined") return err_msg(BLE_ERROR.invalid_message);
      8         return new TextEncoder().encode(value);
      9     }
     10     if (value instanceof ArrayBuffer) return new Uint8Array(value);
     11     if (ArrayBuffer.isView(value)) return new Uint8Array(value.buffer, value.byteOffset, value.byteLength);
     12     return err_msg(BLE_ERROR.invalid_message);
     13 };
     14 
     15 export const ble_message_buffer_source = (bytes: Uint8Array): ArrayBufferView<ArrayBuffer> => {
     16     if (bytes.buffer instanceof ArrayBuffer) return new Uint8Array(bytes.buffer, bytes.byteOffset, bytes.byteLength);
     17     const copy = new Uint8Array(bytes.byteLength);
     18     copy.set(bytes);
     19     return copy;
     20 };
     21 
     22 export const ble_message_text = (bytes: Uint8Array, encoding: BleMessageEncoding = "utf-8"): string | undefined => {
     23     if (typeof TextDecoder === "undefined") return;
     24     try {
     25         return new TextDecoder(encoding).decode(bytes);
     26     } catch {
     27         return;
     28     }
     29 };