Last change
on this file since 6c1585f was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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Property mode
set to
100644
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File size:
1.3 KB
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[6a3a178] | 1 | const { PACKET_TYPES } = require("./commons");
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| 2 |
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| 3 | const withNativeBlob =
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| 4 | typeof Blob === "function" ||
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| 5 | (typeof Blob !== "undefined" &&
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| 6 | Object.prototype.toString.call(Blob) === "[object BlobConstructor]");
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| 7 | const withNativeArrayBuffer = typeof ArrayBuffer === "function";
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| 8 |
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| 9 | // ArrayBuffer.isView method is not defined in IE10
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| 10 | const isView = obj => {
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| 11 | return typeof ArrayBuffer.isView === "function"
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| 12 | ? ArrayBuffer.isView(obj)
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| 13 | : obj && obj.buffer instanceof ArrayBuffer;
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| 14 | };
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| 15 |
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| 16 | const encodePacket = ({ type, data }, supportsBinary, callback) => {
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| 17 | if (withNativeBlob && data instanceof Blob) {
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| 18 | if (supportsBinary) {
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| 19 | return callback(data);
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| 20 | } else {
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| 21 | return encodeBlobAsBase64(data, callback);
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| 22 | }
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| 23 | } else if (
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| 24 | withNativeArrayBuffer &&
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| 25 | (data instanceof ArrayBuffer || isView(data))
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| 26 | ) {
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| 27 | if (supportsBinary) {
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| 28 | return callback(data);
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| 29 | } else {
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| 30 | return encodeBlobAsBase64(new Blob([data]), callback);
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| 31 | }
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| 32 | }
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| 33 | // plain string
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| 34 | return callback(PACKET_TYPES[type] + (data || ""));
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| 35 | };
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| 36 |
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| 37 | const encodeBlobAsBase64 = (data, callback) => {
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| 38 | const fileReader = new FileReader();
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| 39 | fileReader.onload = function() {
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| 40 | const content = fileReader.result.split(",")[1];
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| 41 | callback("b" + content);
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| 42 | };
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| 43 | return fileReader.readAsDataURL(data);
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| 44 | };
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| 45 |
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| 46 | module.exports = encodePacket;
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