compression-random-data.js

Enable keyboard shortcuts

// Deterministic Math.random, from Octane.

var seed = 49734321;

function rand() {

    // Robert Jenkins' 32 bit integer hash function.

    seed = ((seed + 0x7ed55d16) + (seed << 12))  & 0xffffffff;

    seed = ((seed ^ 0xc761c23c) ^ (seed >>> 19)) & 0xffffffff;

    seed = ((seed + 0x165667b1) + (seed << 5))   & 0xffffffff;

    seed = ((seed + 0xd3a2646c) ^ (seed << 9))   & 0xffffffff;

    seed = ((seed + 0xfd7046c5) + (seed << 3))   & 0xffffffff;

    seed = ((seed ^ 0xb55a4f09) ^ (seed >>> 16)) & 0xffffffff;

    return (seed & 0xfffffff) / 0x10000000;

var randomS = "";

function test(len) {

    const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

    var s = "var data = '";

    while (randomS.length < len) {

        randomS += chars.charAt((rand() * chars.length)|0);

    s += randomS;

    s += "'; function f() {}; assertEq(f.toString(), 'function f() {}');";

    eval(s);

for (var i=32740; i<32780; i += 5) {

    test(i);