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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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|
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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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|
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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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