qrloop/lib/__tests__/fountain.js

Envelop big blob of data into frames that can be displayed in series of QR Codes

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const __1 = require("..");
const Buffer_1 = require("../Buffer");
test("there is at least one fountain frame and it's recovering one frame", () => {
    [1000, 5000, 99999].forEach((size) => {
        const data = Buffer.from(Array(size)
            .fill(null)
            .map((_, i) => i % 256));
        const framesExport = (0, __1.dataToFrames)(data, 200, 4);
        let acc = null;
        for (let i = 0; i < framesExport.length; i++) {
            acc = (0, __1.parseFramesReducer)(acc, framesExport[i]);
        }
        if (!acc)
            throw new Error("falsy acc");
        expect(acc.fountainsQueue.length).toBe(0);
        expect(acc.exploredFountains.length).toBeGreaterThan(0);
    });
});
test("wrapData", () => {
    const data = Buffer.from(Array(2000)
        .fill(null)
        .map((_, i) => i % 256));
    const wrappedData = (0, __1.wrapData)(data);
    const buffers = (0, Buffer_1.cutAndPad)(wrappedData, 200);
    const frames = buffers.map((data, frameIndex) => (0, __1.makeDataFrame)({
        data,
        nonce: 0,
        frameIndex,
        totalFrames: buffers.length,
    }));
    const r = frames.reduce(__1.parseFramesReducer, null);
    expect((0, __1.areFramesComplete)(r)).toBe(true);
    expect((0, __1.framesToData)(r).toString("hex")).toBe(data.toString("hex"));
});
test("a fountain can recover one missing frame", () => {
    const data = Buffer.from(Array(2000)
        .fill(null)
        .map((_, i) => i % 256));
    const wrappedData = (0, __1.wrapData)(data);
    const buffers = (0, Buffer_1.cutAndPad)(wrappedData, 200);
    const frames = buffers.map((data, frameIndex) => ({
        frame: (0, __1.makeDataFrame)({
            data,
            nonce: 0,
            frameIndex,
            totalFrames: buffers.length,
        }),
        frameIndex,
    }));
    for (let i = 0; i < buffers.length - 1; i++) {
        const framesMissingOne = frames.slice(0, i).concat(frames.slice(i + 1));
        const fountainFrame = (0, __1.makeFountainFrame)(buffers, frames.map((o) => o.frameIndex));
        const missingOne = framesMissingOne
            .map((o) => o.frame)
            .reduce(__1.parseFramesReducer, null);
        expect((0, __1.areFramesComplete)(missingOne)).toBe(false);
        expect((0, __1.currentNumberOfFrames)(missingOne)).toBe(buffers.length - 1);
        const withFountains = (0, __1.parseFramesReducer)(missingOne, fountainFrame);
        expect((0, __1.areFramesComplete)(withFountains)).toBe(true);
        expect((0, __1.currentNumberOfFrames)(withFountains)).toBe(buffers.length);
        expect((0, __1.framesToData)(withFountains).toString("hex")).toBe(data.toString("hex"));
    }
});
test("2 fountains cascading", () => {
    const data = Buffer.from(Array(2000)
        .fill(null)
        .map((_, i) => i % 256));
    const wrappedData = (0, __1.wrapData)(data);
    const buffers = (0, Buffer_1.cutAndPad)(wrappedData, 200);
    const frames = buffers.map((data, frameIndex) => ({
        frame: (0, __1.makeDataFrame)({
            data,
            nonce: 0,
            frameIndex,
            totalFrames: buffers.length,
        }),
        frameIndex,
    }));
    const framesMissingThree = frames.slice(2, frames.length - 1);
    const fountain1Frame = (0, __1.makeFountainFrame)(buffers, frames.map((o) => o.frameIndex).slice(0, frames.length / 2));
    const fountainAllFrame = (0, __1.makeFountainFrame)(buffers, frames.map((o) => o.frameIndex));
    const missingThree = framesMissingThree
        .map((o) => o.frame)
        .reduce(__1.parseFramesReducer, null);
    expect((0, __1.areFramesComplete)(missingThree)).toBe(false);
    expect((0, __1.currentNumberOfFrames)(missingThree)).toBe(buffers.length - 3);
    const withFountains = [fountain1Frame, fountainAllFrame].reduce(__1.parseFramesReducer, missingThree);
    expect((0, __1.areFramesComplete)(withFountains)).toBe(false);
    expect((0, __1.currentNumberOfFrames)(withFountains)).toBe(buffers.length - 3);
    const withOneMoreFrame = (0, __1.parseFramesReducer)(withFountains, frames[0].frame);
    expect((0, __1.areFramesComplete)(withOneMoreFrame)).toBe(true);
    expect((0, __1.currentNumberOfFrames)(withOneMoreFrame)).toBe(buffers.length);
    expect((0, __1.framesToData)(withOneMoreFrame).toString("hex")).toBe(data.toString("hex"));
});
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