96 lines
2.2 KiB
JavaScript
96 lines
2.2 KiB
JavaScript
/*
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* tar-js
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* MIT (c) 2011 T. Jameson Little
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*/
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(function () {
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"use strict";
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require('require-kiss');
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var lookup = [
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
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'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
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'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
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'w', 'x', 'y', 'z', '0', '1', '2', '3',
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'4', '5', '6', '7', '8', '9', '+', '/'
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];
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function clean(length) {
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var i, buffer = new Uint8Array(length);
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for (i = 0; i < length; i += 1) {
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buffer[i] = 0;
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}
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return buffer;
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}
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function extend(orig, length, addLength, multipleOf) {
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var newSize = length + addLength,
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buffer = clean((parseInt(newSize / multipleOf) + 1) * multipleOf);
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buffer.set(orig);
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return buffer;
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}
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function pad(num, bytes, base) {
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num = num.toString(base || 8);
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return "000000000000".substr(num.length + 12 - bytes) + num;
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}
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function stringToUint8 (input, out, offset) {
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var i, length;
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out = out || clean(input.length);
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offset = offset || 0;
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for (i = 0, length = input.length; i < length; i += 1) {
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out[offset] = input.charCodeAt(i);
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offset += 1;
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}
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return out;
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}
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function uint8ToBase64(uint8) {
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var i,
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extraBytes = uint8.length % 3, // if we have 1 byte left, pad 2 bytes
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output = "",
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temp, length;
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function tripletToBase64 (num) {
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return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F];
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};
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// go through the array every three bytes, we'll deal with trailing stuff later
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for (i = 0, length = uint8.length - extraBytes; i < length; i += 3) {
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temp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2]);
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output += tripletToBase64(temp);
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}
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// this prevents an ERR_INVALID_URL in Chrome (Firefox okay)
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switch (output.length % 4) {
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case 1:
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output += '=';
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break;
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case 2:
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output += '==';
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break;
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default:
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break;
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}
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return output;
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}
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module.exports.clean = clean;
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module.exports.pad = pad;
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module.exports.extend = extend;
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module.exports.stringToUint8 = stringToUint8;
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module.exports.uint8ToBase64 = uint8ToBase64;
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provide('utils');
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}());
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