AirScan-QR/airscan-fountain.html at master · topcss/AirScan-QR · GitHub

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <title>AirScan-QR Fountain (喷泉码版)</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/qrious/4.0.2/qrious.min.js"></script>
    <script src="https://unpkg.com/html5-qrcode"></script>
    <script src="https://cdn.jsdelivr.net/npm/jsqr@1.4.0/dist/jsQR.min.js"></script>
    <script src="https://cdn.tailwindcss.com"></script>
    <style>
        body { font-family: system-ui, -apple-system, sans-serif; -webkit-tap-highlight-color: transparent; }
        .qr-matrix { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; background: white; padding: 12px; border-radius: 24px; box-shadow: 0 10px 40px rgba(0,0,0,0.1); }
        .qr-matrix canvas { width: 100% !important; height: auto !important; border-radius: 8px; }
        .progress-bar { transition: width 0.3s ease; }
        .tab-active { background: white; box-shadow: 0 2px 10px rgba(0,0,0,0.05); color: #2563eb; }
    </style>
</head>
<body class="bg-gray-50 min-h-screen text-slate-900 pb-20">

<div class="max-w-xl mx-auto px-4 pt-8">
    <div class="flex justify-between items-center mb-8">
        <h1 class="text-2xl font-black text-slate-800 tracking-tighter">AirScan <span class="text-blue-600">Fountain</span></h1>
        <div class="bg-gray-200 p-1 rounded-2xl flex text-sm font-bold shadow-inner w-48">
            <button id="tab-s" onclick="switchTab('send')" class="flex-1 py-2 rounded-xl tab-active">发送</button>
            <button id="tab-r" onclick="switchTab('receive')" class="flex-1 py-2 rounded-xl text-slate-500">接收</button>
        </div>
    </div>

    <div id="panel-send" class="space-y-4">
        <div class="bg-white p-6 rounded-[2rem] shadow-sm border border-gray-100">
            <textarea id="inputText" class="w-full p-5 bg-gray-50 border-2 border-dashed border-gray-200 rounded-2xl h-32 focus:border-blue-500 outline-none text-sm mb-4" placeholder="输入文字或选择文件..."></textarea>

            <div id="fileInfo" class="hidden mb-4 p-4 bg-blue-50 rounded-2xl flex justify-between items-center">
                <span id="fileName" class="text-xs font-bold text-blue-700 truncate mr-4"></span>
                <button onclick="resetFile()" class="text-xs font-bold text-red-500">取消</button>
            </div>

            <div class="grid grid-cols-2 gap-4">
                <button onclick="document.getElementById('fileInput').click()" class="py-4 bg-gray-100 rounded-2xl font-bold text-sm">📎 选文件</button>
                <input type="file" id="fileInput" class="hidden">
                <button id="btnStart" onclick="startSending()" class="py-4 bg-blue-600 text-white rounded-2xl font-bold text-sm shadow-xl">🚀 开始喷泉发射</button>
            </div>
        </div>

        <div id="playerBox" class="hidden space-y-4">
            <div class="qr-matrix" id="qrContainer">
                <canvas id="qr0"></canvas>
                <canvas id="qr1"></canvas>
                <canvas id="qr2"></canvas>
                <canvas id="qr3"></canvas>
            </div>
            <div class="bg-white p-6 rounded-[2rem] text-center">
                <p class="text-xs font-black text-slate-400 uppercase tracking-widest mb-1">正在循环生成随机喷泉包</p>
                <div id="sendStats" class="text-2xl font-mono font-black text-blue-600">0 Chunks</div>
                <button onclick="stopSending()" class="mt-4 px-8 py-2 bg-slate-900 text-white rounded-xl text-xs font-bold">停止发送</button>
            </div>
        </div>
    </div>

    <div id="panel-receive" class="hidden space-y-4">
        <div class="bg-white p-6 rounded-[2rem] shadow-sm">
            <div id="reader" class="w-full aspect-square rounded-3xl bg-slate-900 overflow-hidden mb-6 flex items-center justify-center relative">
                <video id="rv" class="hidden absolute inset-0 w-full h-full object-cover"></video>
                <canvas id="rc" class="hidden absolute inset-0 w-full h-full"></canvas>

                <p id="readerPlaceholder" class="text-slate-500 text-xs italic w-full text-center px-4">等待启动...</p>
            </div>

            <div class="grid grid-cols-2 gap-3 mb-6">
                <button onclick="startScanner('environment')" class="py-4 bg-blue-600 text-white rounded-2xl font-bold text-sm shadow-lg">📷 扫码接收</button>
                <button onclick="startScreenScanner()" class="py-4 bg-indigo-600 text-white rounded-2xl font-bold text-sm shadow-lg">🖥️ 录屏接收</button>
            </div>

            <div id="recvProgress" class="hidden space-y-4">
                <div class="flex justify-between items-end">
                    <div>
                        <p id="recvName" class="text-sm font-black text-slate-800 break-all"></p>
                        <p id="recvRank" class="text-[10px] font-bold text-blue-500 uppercase">Rank: 0/0</p>
                    </div>
                    <div class="text-right">
                        <span id="pctText" class="text-3xl font-mono font-black text-slate-900">0</span><span class="text-sm font-bold text-slate-400">%</span>
                    </div>
                </div>
                <div class="w-full h-4 bg-gray-100 rounded-full overflow-hidden">
                    <div id="progressBar" class="progress-bar h-full bg-blue-600 w-0"></div>
                </div>
            </div>
        </div>

        <div id="successCard" class="hidden bg-emerald-600 p-8 rounded-[2.5rem] text-white shadow-2xl text-center">
            <h3 class="font-black text-xl mb-2">🎉 接收完成</h3>
            <p id="finInfo" class="text-xs opacity-80 mb-6"></p>
            <button id="dlBtn" class="w-full py-5 bg-white text-emerald-700 rounded-2xl font-black shadow-lg">立即保存文件</button>
        </div>
    </div>
</div>

<script>
/* --------- 工具函数 (喷泉码核心) --------- */
const Utils = {
    // 线性反馈随机数生成器 (确保发送接收同步)
    PRNG: (s) => () => { s = (s * 16807) % 2147483647; return (s - 1) / 2147483646; },
    xor: (a, b) => { for (let i = 0; i < a.length; i++) a[i] ^= b[i]; },
    u2b: (u8) => btoa(String.fromCharCode.apply(null, u8)),
    b2u: (str) => {
        const b = atob(str);
        const u = new Uint8Array(b.length);
        for (let i = 0; i < b.length; i++) u[i] = b.charCodeAt(i);
        return u;
    },
    getDegree: (L, rng) => {
        const p = rng();
        if (p < 0.4) return 1;
        if (p < 0.7) return 2;
        if (p < 0.9) return Math.min(L, Math.floor(rng() * 10) + 3);
        return Math.min(L, Math.floor(rng() * L * 0.5) + 2);
    }
};

/* --------- 发送端状态 --------- */
let sender = {
    chunks: [], qrs: [], timer: null, tid: "",
    fileName: "", fileSize: 0, chunkSize: 220, fps: 10
};

function initSender() {
    for(let i=0; i<4; i++) {
        sender.qrs[i] = new QRious({ element: document.getElementById(`qr${i}`), size: 300, level: 'L' });
    }
}

async function startSending() {
    const text = document.getElementById('inputText').value;
    let dataU8;
    if (sender.rawData) {
        dataU8 = sender.rawData;
    } else if (text) {
        dataU8 = new TextEncoder().encode(text);
        sender.fileName = "note_" + Date.now().toString().slice(-4) + ".txt";
    } else {
        return alert("请先输入内容");
    }

    sender.fileSize = dataU8.length;
    sender.chunks = [];
    for (let i = 0; i < dataU8.length; i += sender.chunkSize) {
        let chunk = dataU8.slice(i, i + sender.chunkSize);
        if (chunk.length < sender.chunkSize) {
            let padded = new Uint8Array(sender.chunkSize);
            padded.set(chunk);
            chunk = padded;
        }
        sender.chunks.push(chunk);
    }

    sender.tid = Math.random().toString(36).slice(-3).toUpperCase();
    document.getElementById('playerBox').classList.remove('hidden');
    document.getElementById('sendStats').innerText = `${sender.chunks.length} Chunks`;

    initSender();
    sender.timer = setInterval(tick, 1000 / sender.fps);
}

function tick() {
    const L = sender.chunks.length;
    const meta = encodeURIComponent(sender.fileName) + ":" + sender.fileSize;
    // 同时更新4个QR
    for (let i = 0; i < 4; i++) {
        const seed = Math.floor(Math.random() * 1000000);
        const rng = Utils.PRNG(seed);
        const d = Math.min(L, Utils.getDegree(L, rng));
        const idxs = [];
        while (idxs.length < d) {
            let x = Math.floor(rng() * L);
            if (!idxs.includes(x)) idxs.push(x);
        }
        const xorBuf = new Uint8Array(sender.chunkSize);
        idxs.forEach(idx => Utils.xor(xorBuf, sender.chunks[idx]));
        // 格式: ID|种子|总块数|数据|元数据
        sender.qrs[i].value = `${sender.tid}|${seed}|${L}|${Utils.u2b(xorBuf)}|${meta}`;
    }
}

function stopSending() {
    clearInterval(sender.timer);
    document.getElementById('playerBox').classList.add('hidden');
}

/* --------- 接收端状态 (核心解码) --------- */
let recv = {
    active: false, tid: "", total: 0, solved: {}, queue: [],
    fileName: "", fileSize: 0, startTime: 0, stream: null
};

async function startScanner(mode) {
    const ph = document.getElementById('readerPlaceholder');
    ph.innerText = "正在启动摄像头...";
    recv.active = true;
    const video = document.getElementById('rv');
    try {
        const stream = await navigator.mediaDevices.getUserMedia({ video: { facingMode: mode } });
        video.srcObject = stream;
        recv.stream = stream;
        await video.play();
        video.classList.remove('hidden');
        ph.classList.add('hidden');
        requestAnimationFrame(scanLoop);
    } catch (e) { ph.innerText = "摄像头启动失败: " + e.message; }
}

async function startScreenScanner() {
    const ph = document.getElementById('readerPlaceholder');
    ph.innerText = "请在系统弹窗中选择屏幕...";
    recv.active = true;
    const video = document.getElementById('rv');
    try {
        const stream = await navigator.mediaDevices.getDisplayMedia({ video: true });
        video.srcObject = stream;
        recv.stream = stream;
        await video.play();
        video.classList.remove('hidden');
        ph.classList.add('hidden');
        requestAnimationFrame(scanLoop);
    } catch (e) { ph.innerText = "录屏已取消"; }
}

function scanLoop() {
    if (!recv.active) return;
    const video = document.getElementById('rv');
    const canvas = document.getElementById('rc');
    if (video.readyState === video.HAVE_ENOUGH_DATA) {
        canvas.width = video.videoWidth;
        canvas.height = video.videoHeight;
        const ctx = canvas.getContext('2d');
        ctx.drawImage(video, 0, 0);

        // 分块扫描优化：分别扫描全屏和四个象限（适配矩阵QR）
        const w = canvas.width, h = canvas.height;
        const regions = [
            {x:0, y:0, w:w, h:h}, // 全屏
            {x:0, y:0, w:w/2, h:h/2}, // 左上
            {x:w/2, y:0, w:w/2, h:h/2}, // 右上
            {x:0, y:h/2, w:w/2, h:h/2}, // 左下
            {x:w/2, y:h/2, w:w/2, h:h/2} // 右下
        ];

        regions.forEach(r => {
            const imgData = ctx.getImageData(r.x, r.y, r.w, r.h);
            const code = jsQR(imgData.data, imgData.width, imgData.height);
            if (code) handleFountainPacket(code.data);
        });
    }
    requestAnimationFrame(scanLoop);
}

function handleFountainPacket(raw) {
    if (!recv.active || recv.isFinishing) return;
    const p = raw.split('|');
    if (p.length < 5) return;
    const [tid, seed, total, b64, meta] = [p[0], parseInt(p[1]), parseInt(p[2]), p[3], p[4]];

    if (recv.tid !== tid) {
        recv.tid = tid; recv.total = total; recv.solved = {}; recv.queue = [];
        recv.startTime = Date.now(); recv.isFinishing = false;
        const [n, s] = meta.split(':');
        recv.fileName = decodeURIComponent(n); recv.fileSize = parseInt(s);
        recv.currentChunkSize = Utils.b2u(b64).length; // 动态识别块大小
        document.getElementById('recvProgress').classList.remove('hidden');
        document.getElementById('recvName').innerText = recv.fileName;
        document.getElementById('successCard').classList.add('hidden');
    }

    if (Object.keys(recv.solved).length < recv.total) {
        processPacket(seed, total, Utils.b2u(b64));
    }
}

function processPacket(seed, L, data) {
    if (recv.isFinishing) return;
    const rng = Utils.PRNG(seed);
    const d = Utils.getDegree(L, rng);
    const idxs = [];
    while (idxs.length < d) {
        let x = Math.floor(rng() * L);
        if (!idxs.includes(x)) idxs.push(x);
    }

    if (L === 1) {
        if (!recv.solved[0]) {
            recv.solved[0] = data;
        }
        updateRecvUI(); // 确保即便已存在也触发一次UI检查，以防万一
        return;
    }

    let curData = data;
    let curIdxs = idxs.sort((a, b) => a - b);
    for (let i = 0; i < curIdxs.length; i++) {
        const idx = curIdxs[i];
        if (recv.solved[idx]) { Utils.xor(curData, recv.solved[idx]); curIdxs.splice(i, 1); i--; }
    }
    if (curIdxs.length === 0) return;

    for (let item of recv.queue) {
        if (curIdxs.length === 0) break;
        if (item.idxs[0] === curIdxs[0]) {
            Utils.xor(curData, item.u8);
            curIdxs = xorIdxLists(curIdxs, item.idxs);
        } else if (item.idxs[0] > curIdxs[0]) break;
    }

    if (curIdxs.length > 0) {
        recv.queue.push({ idxs: curIdxs, u8: curData });
        recv.queue.sort((a, b) => a.idxs[0] - b.idxs[0]);
    }

    let foundNew = true;
    while (foundNew) {
        foundNew = false;
        for (let i = 0; i < recv.queue.length; i++) {
            if (recv.queue[i].idxs.length === 1) {
                const sIdx = recv.queue[i].idxs[0];
                const sData = recv.queue[i].u8;
                recv.solved[sIdx] = sData;
                recv.queue.splice(i, 1);
                foundNew = true;
                recv.queue.forEach(it => {
                    if (it.idxs.includes(sIdx)) { Utils.xor(it.u8, sData); it.idxs = it.idxs.filter(id => id !== sIdx); }
                });
                break;
            }
        }
    }
    updateRecvUI();
}

function xorIdxLists(a, b) {
    const s = new Set(a);
    b.forEach(x => s.has(x) ? s.delete(x) : s.add(x));
    return Array.from(s).sort((n1, n2) => n1 - n2);
}

function updateRecvUI() {
    const done = Object.keys(recv.solved).length;
    const pct = Math.min(100, Math.floor((done / recv.total) * 100));
    document.getElementById('progressBar').style.width = pct + '%';
    document.getElementById('pctText').innerText = pct;
    document.getElementById('recvRank').innerText = `Rank: ${done} / ${recv.total}`;

    if (done >= recv.total) finalizeRecv();
}

function finalizeRecv() {
    if (recv.isFinishing) return;
    recv.isFinishing = true;
    recv.active = false;
    if(recv.stream) { recv.stream.getTracks().forEach(t => t.stop()); recv.stream = null; }

    const finalU8 = new Uint8Array(recv.fileSize);
    for (let i = 0; i < recv.total; i++) {
        const start = i * recv.currentChunkSize;
        if (start < recv.fileSize) {
            const len = Math.min(recv.currentChunkSize, recv.fileSize - start);
            if (recv.solved[i]) finalU8.set(recv.solved[i].slice(0, len), start);
        }
    }

    const blob = new Blob([finalU8], { type: 'application/octet-stream' });
    document.getElementById('successCard').classList.remove('hidden');
    document.getElementById('finInfo').innerText = `${recv.fileName} (${(recv.fileSize/1024).toFixed(1)} KB)`;
    document.getElementById('dlBtn').onclick = () => {
        const a = document.createElement('a'); a.href = URL.createObjectURL(blob);
        a.download = recv.fileName; a.click();
    };
}

/* --------- UI 基础逻辑 --------- */
function switchTab(t) {
    document.getElementById('panel-send').classList.toggle('hidden', t!=='send');
    document.getElementById('panel-receive').classList.toggle('hidden', t!=='receive');
    document.getElementById('tab-s').className = t==='send' ? 'flex-1 py-2 rounded-xl tab-active' : 'flex-1 py-2 rounded-xl text-slate-500';
    document.getElementById('tab-r').className = t==='receive' ? 'flex-1 py-2 rounded-xl tab-active' : 'flex-1 py-2 rounded-xl text-slate-500';
    if(t === 'send') { recv.active = false; if(recv.stream) recv.stream.getTracks().forEach(t=>t.stop()); }
}

document.getElementById('fileInput').onchange = (e) => {
    const f = e.target.files[0]; if(!f) return;
    sender.fileName = f.name;
    const r = new FileReader();
    r.onload = (ev) => {
        sender.rawData = new Uint8Array(ev.target.result);
        document.getElementById('fileInfo').classList.remove('hidden');
        document.getElementById('fileName').innerText = f.name;
    };
    r.readAsArrayBuffer(f);
};

function resetFile() {
    sender.rawData = null;
    document.getElementById('fileInfo').classList.add('hidden');
    document.getElementById('fileInput').value = '';
}

// 初始化
initSender();
</script>
</body>
</html>