Simple Chat Room in NodeJS, expressJS and mongoDB in Docker Swarm
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4 years ago
'use strict';
const bitfield = require('sparse-bitfield');
const codePoints = require('./lib/code-points');
const unassigned_code_points = bitfield();
const commonly_mapped_to_nothing = bitfield();
const non_ascii_space_characters = bitfield();
const prohibited_characters = bitfield();
const bidirectional_r_al = bitfield();
const bidirectional_l = bitfield();
/**
* Iterare over code points and
* convert it into an buffer.
* @param {bitfield} bits
* @param {Array} src
* @returns {Buffer}
*/
function traverse(bits, src) {
for (const code of src.keys()) {
bits.set(code, true);
}
const buffer = bits.toBuffer();
return Buffer.concat([createSize(buffer), buffer]);
}
/**
* @param {Buffer} buffer
* @returns {Buffer}
*/
function createSize(buffer) {
const buf = Buffer.alloc(4);
buf.writeUInt32BE(buffer.length);
return buf;
}
const memory = [];
memory.push(
traverse(unassigned_code_points, codePoints.unassigned_code_points),
traverse(commonly_mapped_to_nothing, codePoints.commonly_mapped_to_nothing),
traverse(non_ascii_space_characters, codePoints.non_ASCII_space_characters),
traverse(prohibited_characters, codePoints.prohibited_characters),
traverse(bidirectional_r_al, codePoints.bidirectional_r_al),
traverse(bidirectional_l, codePoints.bidirectional_l)
);
process.stdout.write(Buffer.concat(memory));