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69 lines
2.2 KiB
JavaScript
69 lines
2.2 KiB
JavaScript
import { PACKET_TYPES } from "./commons.js";
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const withNativeBlob = typeof Blob === "function" ||
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(typeof Blob !== "undefined" &&
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Object.prototype.toString.call(Blob) === "[object BlobConstructor]");
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const withNativeArrayBuffer = typeof ArrayBuffer === "function";
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// ArrayBuffer.isView method is not defined in IE10
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const isView = (obj) => {
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return typeof ArrayBuffer.isView === "function"
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? ArrayBuffer.isView(obj)
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: obj && obj.buffer instanceof ArrayBuffer;
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};
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const encodePacket = ({ type, data }, supportsBinary, callback) => {
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if (withNativeBlob && data instanceof Blob) {
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if (supportsBinary) {
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return callback(data);
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}
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else {
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return encodeBlobAsBase64(data, callback);
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}
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}
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else if (withNativeArrayBuffer &&
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(data instanceof ArrayBuffer || isView(data))) {
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if (supportsBinary) {
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return callback(data);
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}
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else {
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return encodeBlobAsBase64(new Blob([data]), callback);
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}
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}
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// plain string
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return callback(PACKET_TYPES[type] + (data || ""));
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};
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const encodeBlobAsBase64 = (data, callback) => {
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const fileReader = new FileReader();
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fileReader.onload = function () {
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const content = fileReader.result.split(",")[1];
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callback("b" + (content || ""));
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};
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return fileReader.readAsDataURL(data);
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};
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function toArray(data) {
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if (data instanceof Uint8Array) {
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return data;
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}
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else if (data instanceof ArrayBuffer) {
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return new Uint8Array(data);
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}
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else {
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return new Uint8Array(data.buffer, data.byteOffset, data.byteLength);
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}
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}
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let TEXT_ENCODER;
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export function encodePacketToBinary(packet, callback) {
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if (withNativeBlob && packet.data instanceof Blob) {
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return packet.data.arrayBuffer().then(toArray).then(callback);
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}
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else if (withNativeArrayBuffer &&
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(packet.data instanceof ArrayBuffer || isView(packet.data))) {
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return callback(toArray(packet.data));
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}
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encodePacket(packet, false, (encoded) => {
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if (!TEXT_ENCODER) {
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TEXT_ENCODER = new TextEncoder();
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}
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callback(TEXT_ENCODER.encode(encoded));
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});
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}
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export { encodePacket };
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