54 lines
2.1 KiB
JavaScript
54 lines
2.1 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.polyUint32Array = exports.polyUint16Array = exports.decode = void 0;
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var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
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// Use a lookup table to find the index.
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var lookup = typeof Uint8Array === 'undefined' ? [] : new Uint8Array(256);
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for (var i = 0; i < chars.length; i++) {
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lookup[chars.charCodeAt(i)] = i;
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}
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var decode = function (base64) {
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var bufferLength = base64.length * 0.75, len = base64.length, i, p = 0, encoded1, encoded2, encoded3, encoded4;
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if (base64[base64.length - 1] === '=') {
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bufferLength--;
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if (base64[base64.length - 2] === '=') {
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bufferLength--;
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}
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}
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var buffer = typeof ArrayBuffer !== 'undefined' &&
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typeof Uint8Array !== 'undefined' &&
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typeof Uint8Array.prototype.slice !== 'undefined'
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? new ArrayBuffer(bufferLength)
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: new Array(bufferLength);
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var bytes = Array.isArray(buffer) ? buffer : new Uint8Array(buffer);
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for (i = 0; i < len; i += 4) {
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encoded1 = lookup[base64.charCodeAt(i)];
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encoded2 = lookup[base64.charCodeAt(i + 1)];
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encoded3 = lookup[base64.charCodeAt(i + 2)];
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encoded4 = lookup[base64.charCodeAt(i + 3)];
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bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
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bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
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bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
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}
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return buffer;
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};
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exports.decode = decode;
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var polyUint16Array = function (buffer) {
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var length = buffer.length;
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var bytes = [];
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for (var i = 0; i < length; i += 2) {
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bytes.push((buffer[i + 1] << 8) | buffer[i]);
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}
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return bytes;
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};
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exports.polyUint16Array = polyUint16Array;
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var polyUint32Array = function (buffer) {
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var length = buffer.length;
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var bytes = [];
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for (var i = 0; i < length; i += 4) {
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bytes.push((buffer[i + 3] << 24) | (buffer[i + 2] << 16) | (buffer[i + 1] << 8) | buffer[i]);
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}
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return bytes;
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};
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exports.polyUint32Array = polyUint32Array;
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//# sourceMappingURL=Util.js.map
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