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sourcemaps.js

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// @ts-check

/**

* @param {string} message

* @returns {never}

*/

function fail(message) {

throw new Error(message);

}

/**

* @param {number} value

*/

function base64FormatEncode(value) {

return value < 0 ? fail("Invalid value") :

value < 26 ? 0x41 /*A*/ + value :

value < 52 ? 0x61 /*a*/ + value - 26 :

value < 62 ? 0x30 /*0*/ + value - 52 :

value === 62 ? 0x2B /*+*/ :

value === 63 ? 0x2F /*/*/ :

fail("Invalid value");

}

/**

* @param {number} value

*/

function base64VLQFormatEncode(value) {

if (value < 0) {

value = ((-value) << 1) + 1;

}

else {

value = value << 1;

}

// Encode 5 bits at a time starting from least significant bits

let result = "";

do {

let currentDigit = value & 31; // 11111

value = value >> 5;

if (value > 0) {

// There are still more digits to decode, set the msb (6th bit)

currentDigit = currentDigit | 32;

}

result += String.fromCharCode(base64FormatEncode(currentDigit));

} while (value > 0);

return result;

}

exports.base64VLQFormatEncode = base64VLQFormatEncode;