diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b17d48f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,143 @@
+# Stackable Metronome
+
+A browser **polymetric groove trainer / metronome** — and the design mockup for a
+Raspberry Pi Pico hardware build. Stack as many "meter lanes" as you like; each is
+its own little metronome with a grouping, subdivision, drum voice and per-beat
+pattern. Layering lanes produces polymeter and true ratio polyrhythm.
+
+**Live:** https://metronome.varasys.io
+
+It's a single page (`index.html`) plus a vendored QR library — no build step,
+no framework. State (presets, set lists, practice log, theme) lives in
+`localStorage`.
+
+## Features
+
+- **Meter lanes** — grouping (odd meters), subdivision, GM drum voice, per‑beat
+  on/off pattern (rests), mute, live measure counter.
+- **Polyrhythm** — a per‑lane *poly* toggle fits a lane's beats evenly into lane 1's
+  bar (e.g. 5‑over‑4, 3‑over‑2).
+- **Practice** — gap/mute trainer (play N / mute M bars) and a tempo ramp with a
+  start BPM and signed step.
+- **Set lists** — named, ordered lists of saved setups; ▶ loads + starts an item,
+  **N** advances; each play is logged for cross‑day comparison.
+- **Sharing** — copy a link (with QR) to your current settings or a whole set list.
+- **Theming** — System / Light / Dark.
+
+## The share language
+
+A compact, human‑readable text encodes a full configuration (a *patch*). It's what
+goes in a share link, and you can hand‑write or edit it.
+
+### Patch grammar
+
+```
+v1 ; t<bpm> [; vol<pct>] ; <lane> ; <lane> … [; tr<play>/<mute>] [; rmp<start>/<step>/<every>]
+```
+
+| Token | Meaning | Example |
+|-------|---------|---------|
+| `v1` | format version (always first) | `v1` |
+| `t<bpm>` | tempo | `t120` |
+| `vol<pct>` | master volume 0–100 | `vol70` |
+| `tr<play>/<mute>` | gap trainer: play N bars, mute M | `tr2/2` |
+| `rmp<start>/<step>/<every>` | tempo ramp: start BPM, ±step, every N bars | `rmp80/5/4` |
+| `<lane>` | a meter lane (see below) | `kick:4` |
+
+Tokens are joined with `;`. `tr` and `rmp` are omitted when off.
+
+### Lane grammar
+
+```
+<sound> : <grouping> [ / <sub> ] [ = <pattern> ] [ ~ ] [ ! ]
+```
+
+- **sound** — one of:
+  `beep`, `kick`, `snare`, `rim`, `clap`, `hatClosed`, `hatOpen`, `ride`, `crash`,
+  `tomLow`, `tomMid`, `tomHigh`, `tambourine`, `cowbell`, `woodblock`, `claves`,
+  `jamblock` (unknown → `beep`).
+- **grouping** — beats per bar, optionally grouped for odd meters: `4`, `3`,
+  `2+2+3`. The first beat of each group is accented.
+- **`/sub`** — subdivision (clicks per beat): `1` quarter (default), `2` eighth,
+  `3` triplet, `4` sixteenth, `6` sextuplet. Omit for quarter.
+- **`=pattern`** — per‑beat on/off as `x`/`.`, length = beats per bar. Omit = all on.
+  e.g. `=.x.x` puts a backbeat on 2 & 4.
+- **`~`** — polyrhythm: fit this lane's beats evenly into **lane 1's** bar.
+- **`!`** — mute the lane.
+
+### Examples
+
+| Patch / lane | What it is |
+|---|---|
+| `kick:4` | kick on 4 quarter beats |
+| `snare:4=.x.x` | snare backbeat (2 & 4) |
+| `hatClosed:4/2` | eighth‑note hi‑hats |
+| `claves:5~` | 5 evenly across lane 1's bar (5‑over‑4 if lane 1 is `4`) |
+| `kick:2+2+3=x..x..x` | 7/8, kick on each group start |
+| `cowbell:3+2/2` | 5/4 grouped 3+2, eighth subdivision |
+| **Full:** `v1;t120;kick:4;snare:4=.x.x;hatClosed:4/2;tr2/2` | backbeat groove with gap trainer |
+
+### In URLs
+
+- **Settings:** `…/#p=<patch>` — readable, e.g.
+  `…/#p=v1;t120;kick:4;claves:5~`
+- **Set list:** `…/#sl=<base64url>` — a JSON `{title, description, items[]}` where
+  each item's config is a patch string. Used because titles/notes are free text.
+
+Opening such a link applies the settings (or imports the set list) on load, then
+clears the hash so a refresh won't re‑import.
+
+## Sharing & QR
+
+In the set‑list panel's **⋯** menu:
+- **Share settings link** / **Share set‑list link** open a dialog with the link and
+  a **QR code** (scan to open on a phone). Copy or Open from there.
+- **Export all / Import file** back up presets + set lists + logs as a JSON file.
+
+QR codes are generated locally by the vendored `qrcode.js`; the link never leaves
+your browser. Very long set‑list links may exceed QR capacity — copy those instead.
+
+## Keyboard shortcuts
+
+| Key | Action |
+|-----|--------|
+| `Space` | start / stop |
+| `T` | tap tempo |
+| `↑` / `↓` | tempo ±1 (`Shift` = ±10) |
+| `A` | add meter lane |
+| `1`–`9` | mute lane N |
+| `R` | toggle the set‑list panel |
+| `N` | next set‑list item |
+| `?` | shortcuts help |
+| `Esc` | close dialog / panel |
+
+## Versioning
+
+`VERSION` holds the formal version. `deploy.sh` stamps the served page:
+
+- **Formal** — a clean commit tagged `v<VERSION>` → `X.Y.Z`.
+- **Dev** — anything else → `X.Y.Z-dev.<utc-timestamp>.<short-sha>[.dirty]`.
+
+Cut a release with `./release.sh [X.Y.Z]` (bumps `VERSION` + tags `v<VERSION>`),
+then push the tag and deploy.
+
+## Deploy
+
+`./deploy.sh` copies `index.html` (version‑stamped) and `qrcode.js` into the Caddy
+web root and smoke‑tests the live URL. No restart needed (`file_server` picks up
+changes immediately).
+
+## Files
+
+| File | Purpose |
+|------|---------|
+| `index.html` | the whole app |
+| `qrcode.js` | vendored QR generator (Kazuhiko Arase, MIT) |
+| `deploy.sh` | publish to the Caddy web root |
+| `release.sh` | tag a formal version |
+| `VERSION` | formal version string |
+
+## Credits
+
+QR generation by [qrcode-generator](https://github.com/kazuhikoarase/qrcode-generator)
+(© Kazuhiko Arase, MIT).
diff --git a/deploy.sh b/deploy.sh
index fa68c9a..9c20dba 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -37,6 +37,9 @@ fi
 sed "s|const APP_VERSION = \"[^\"]*\";|const APP_VERSION = \"$BUILD\";|" "$SRC_DIR/index.html" > "$DEST_DIR/index.html"
 echo "deployed v$BUILD ($(stat -c '%s' "$DEST_DIR/index.html") bytes) -> $DEST_DIR"
 
+# vendored assets served alongside index.html
+[[ -f "$SRC_DIR/qrcode.js" ]] && cp "$SRC_DIR/qrcode.js" "$DEST_DIR/qrcode.js" && echo "deployed qrcode.js"
+
 # If real audio samples are added later (see the plan's GM-sample note),
 # sync that directory too.
 if [[ -d "$SRC_DIR/samples" ]]; then
diff --git a/index.html b/index.html
index 9a36e0e..af70aaf 100644
--- a/index.html
+++ b/index.html
@@ -138,6 +138,9 @@
   .overlay { position:fixed; inset:0; background:rgba(0,0,0,.55); display:flex; align-items:center; justify-content:center; z-index:80; }
   .overlay[hidden] { display:none; }
   .overlay-box { background:var(--panel-2); border:1px solid var(--edge); border-radius:14px; padding:16px 20px; width:380px; max-width:92vw; box-shadow:0 20px 60px rgba(0,0,0,.6); }
+  .qr { background:#fff; border-radius:8px; padding:10px; text-align:center; margin-bottom:12px; }
+  .qr img { display:block; margin:0 auto; image-rendering:pixelated; max-width:100%; }
+  #shareUrl { width:100%; resize:vertical; background:var(--panel); color:var(--txt); border:1px solid var(--edge); border-radius:8px; padding:8px; font-family:"Courier New",monospace; font-size:12px; }
   .kbd-table { width:100%; border-collapse:collapse; font-size:13px; }
   .kbd-table td { padding:6px 4px; border-bottom:1px solid var(--edge); }
   .kbd-table tr:last-child td { border-bottom:none; }
@@ -275,6 +278,18 @@
   </div>
 </div>
 
+<!-- Share dialog: copyable link + QR code -->
+<div id="shareOverlay" class="overlay" hidden>
+  <div class="overlay-box">
+    <div class="tray-head"><h2 id="shareTitle" style="margin:0">Share</h2><button class="x" id="shareClose" title="close" style="margin-left:0">✕</button></div>
+    <div id="shareQr" class="qr"></div>
+    <textarea id="shareUrl" readonly rows="3"></textarea>
+    <div class="btnrow" style="margin-top:8px"><button id="shareCopy">Copy link</button><button id="shareOpen">Open ↗</button></div>
+    <div class="hint" id="shareNote"></div>
+  </div>
+</div>
+
+<script src="qrcode.js"></script>
 <script>
 "use strict";
 
@@ -841,12 +856,24 @@ function codeToSetlist(code) {
 }
 
 function shareLink(hashPart) { return location.origin + location.pathname + "#" + hashPart; }
-async function copyShare(txt, label) {
-  try { await navigator.clipboard.writeText(txt); alert(label + " link copied:\n\n" + txt); }
-  catch (e) { prompt(label + " link (copy it):", txt); }
+function renderQR(el, text) {
+  el.innerHTML = "";
+  if (typeof qrcode !== "function") { el.textContent = "(QR library not loaded)"; return; }
+  try { const qr = qrcode(0, "M"); qr.addData(text); qr.make(); el.innerHTML = qr.createImgTag(4, 10); }
+  catch (e) { el.textContent = "Link too long to fit a QR — use Copy."; }
+}
+function openShare(title, url, note) {
+  $("shareTitle").textContent = title;
+  $("shareUrl").value = url;
+  $("shareNote").textContent = note || "";
+  renderQR($("shareQr"), url);
+  $("shareOverlay").hidden = false;
+}
+function shareSettings() { openShare("Share settings", shareLink("p=" + currentPatch()), "Encodes tempo, lanes & practice settings. Scan the QR or copy the link."); }
+function shareSetlist() {
+  const sl = getSL(); if (!sl) return alert("No set list selected to share.");
+  openShare("Share “" + (sl.title || "set list") + "”", shareLink("sl=" + setlistToCode(sl)), "Whole set list. Long links may not scan well — use Copy.");
 }
-function shareSettings() { copyShare(shareLink("p=" + currentPatch()), "Settings"); }
-function shareSetlist() { const sl = getSL(); if (!sl) return alert("No set list selected to share."); copyShare(shareLink("sl=" + setlistToCode(sl)), "Set list"); }
 
 // Apply a shared link on load. Returns true if it set the metronome state.
 function applyHashShare() {
@@ -982,6 +1009,10 @@ $("importFile").addEventListener("change", (e) => { if (e.target.files[0]) impor
 $("clearLogBtn").addEventListener("click", () => { $("trayMenu").hidden = true; clearLog(); });
 $("shareSettingsBtn").addEventListener("click", () => { $("trayMenu").hidden = true; shareSettings(); });
 $("shareSetlistBtn").addEventListener("click", () => { $("trayMenu").hidden = true; shareSetlist(); });
+$("shareClose").addEventListener("click", () => $("shareOverlay").hidden = true);
+$("shareOverlay").addEventListener("click", (e) => { if (e.target.id === "shareOverlay") $("shareOverlay").hidden = true; });
+$("shareCopy").addEventListener("click", async () => { try { await navigator.clipboard.writeText($("shareUrl").value); const b = $("shareCopy"); b.textContent = "Copied!"; setTimeout(() => b.textContent = "Copy link", 1200); } catch (e) { $("shareUrl").select(); } });
+$("shareOpen").addEventListener("click", () => window.open($("shareUrl").value, "_blank"));
 window.addEventListener("keydown", (e) => {
   const t = e.target;
   if (t && (t.tagName === "INPUT" || t.tagName === "SELECT" || t.tagName === "TEXTAREA" || t.isContentEditable)) return;
@@ -995,7 +1026,7 @@ window.addEventListener("keydown", (e) => {
   else if (k === "r" || k === "R") { $("routineTray").classList.toggle("open"); }
   else if (k === "n" || k === "N") { nextItem(); }
   else if (k === "?") { toggleShortcuts(true); }
-  else if (k === "Escape") { if (!$("shortcutsOverlay").hidden) toggleShortcuts(false); else $("routineTray").classList.remove("open"); }
+  else if (k === "Escape") { if (!$("shareOverlay").hidden) $("shareOverlay").hidden = true; else if (!$("shortcutsOverlay").hidden) toggleShortcuts(false); else $("routineTray").classList.remove("open"); }
   else if (k >= "1" && k <= "9") {
     const m = meters[+k - 1];
     if (m) { m.mute = !m.mute; const cb = m.el.querySelector(`#m${m.id}_mute`); if (cb) cb.checked = m.mute; }
diff --git a/qrcode.js b/qrcode.js
new file mode 100644
index 0000000..76889b5
--- /dev/null
+++ b/qrcode.js
@@ -0,0 +1,2297 @@
+//---------------------------------------------------------------------
+//
+// QR Code Generator for JavaScript
+//
+// Copyright (c) 2009 Kazuhiko Arase
+//
+// URL: http://www.d-project.com/
+//
+// Licensed under the MIT license:
+//  http://www.opensource.org/licenses/mit-license.php
+//
+// The word 'QR Code' is registered trademark of
+// DENSO WAVE INCORPORATED
+//  http://www.denso-wave.com/qrcode/faqpatent-e.html
+//
+//---------------------------------------------------------------------
+
+var qrcode = function() {
+
+  //---------------------------------------------------------------------
+  // qrcode
+  //---------------------------------------------------------------------
+
+  /**
+   * qrcode
+   * @param typeNumber 1 to 40
+   * @param errorCorrectionLevel 'L','M','Q','H'
+   */
+  var qrcode = function(typeNumber, errorCorrectionLevel) {
+
+    var PAD0 = 0xEC;
+    var PAD1 = 0x11;
+
+    var _typeNumber = typeNumber;
+    var _errorCorrectionLevel = QRErrorCorrectionLevel[errorCorrectionLevel];
+    var _modules = null;
+    var _moduleCount = 0;
+    var _dataCache = null;
+    var _dataList = [];
+
+    var _this = {};
+
+    var makeImpl = function(test, maskPattern) {
+
+      _moduleCount = _typeNumber * 4 + 17;
+      _modules = function(moduleCount) {
+        var modules = new Array(moduleCount);
+        for (var row = 0; row < moduleCount; row += 1) {
+          modules[row] = new Array(moduleCount);
+          for (var col = 0; col < moduleCount; col += 1) {
+            modules[row][col] = null;
+          }
+        }
+        return modules;
+      }(_moduleCount);
+
+      setupPositionProbePattern(0, 0);
+      setupPositionProbePattern(_moduleCount - 7, 0);
+      setupPositionProbePattern(0, _moduleCount - 7);
+      setupPositionAdjustPattern();
+      setupTimingPattern();
+      setupTypeInfo(test, maskPattern);
+
+      if (_typeNumber >= 7) {
+        setupTypeNumber(test);
+      }
+
+      if (_dataCache == null) {
+        _dataCache = createData(_typeNumber, _errorCorrectionLevel, _dataList);
+      }
+
+      mapData(_dataCache, maskPattern);
+    };
+
+    var setupPositionProbePattern = function(row, col) {
+
+      for (var r = -1; r <= 7; r += 1) {
+
+        if (row + r <= -1 || _moduleCount <= row + r) continue;
+
+        for (var c = -1; c <= 7; c += 1) {
+
+          if (col + c <= -1 || _moduleCount <= col + c) continue;
+
+          if ( (0 <= r && r <= 6 && (c == 0 || c == 6) )
+              || (0 <= c && c <= 6 && (r == 0 || r == 6) )
+              || (2 <= r && r <= 4 && 2 <= c && c <= 4) ) {
+            _modules[row + r][col + c] = true;
+          } else {
+            _modules[row + r][col + c] = false;
+          }
+        }
+      }
+    };
+
+    var getBestMaskPattern = function() {
+
+      var minLostPoint = 0;
+      var pattern = 0;
+
+      for (var i = 0; i < 8; i += 1) {
+
+        makeImpl(true, i);
+
+        var lostPoint = QRUtil.getLostPoint(_this);
+
+        if (i == 0 || minLostPoint > lostPoint) {
+          minLostPoint = lostPoint;
+          pattern = i;
+        }
+      }
+
+      return pattern;
+    };
+
+    var setupTimingPattern = function() {
+
+      for (var r = 8; r < _moduleCount - 8; r += 1) {
+        if (_modules[r][6] != null) {
+          continue;
+        }
+        _modules[r][6] = (r % 2 == 0);
+      }
+
+      for (var c = 8; c < _moduleCount - 8; c += 1) {
+        if (_modules[6][c] != null) {
+          continue;
+        }
+        _modules[6][c] = (c % 2 == 0);
+      }
+    };
+
+    var setupPositionAdjustPattern = function() {
+
+      var pos = QRUtil.getPatternPosition(_typeNumber);
+
+      for (var i = 0; i < pos.length; i += 1) {
+
+        for (var j = 0; j < pos.length; j += 1) {
+
+          var row = pos[i];
+          var col = pos[j];
+
+          if (_modules[row][col] != null) {
+            continue;
+          }
+
+          for (var r = -2; r <= 2; r += 1) {
+
+            for (var c = -2; c <= 2; c += 1) {
+
+              if (r == -2 || r == 2 || c == -2 || c == 2
+                  || (r == 0 && c == 0) ) {
+                _modules[row + r][col + c] = true;
+              } else {
+                _modules[row + r][col + c] = false;
+              }
+            }
+          }
+        }
+      }
+    };
+
+    var setupTypeNumber = function(test) {
+
+      var bits = QRUtil.getBCHTypeNumber(_typeNumber);
+
+      for (var i = 0; i < 18; i += 1) {
+        var mod = (!test && ( (bits >> i) & 1) == 1);
+        _modules[Math.floor(i / 3)][i % 3 + _moduleCount - 8 - 3] = mod;
+      }
+
+      for (var i = 0; i < 18; i += 1) {
+        var mod = (!test && ( (bits >> i) & 1) == 1);
+        _modules[i % 3 + _moduleCount - 8 - 3][Math.floor(i / 3)] = mod;
+      }
+    };
+
+    var setupTypeInfo = function(test, maskPattern) {
+
+      var data = (_errorCorrectionLevel << 3) | maskPattern;
+      var bits = QRUtil.getBCHTypeInfo(data);
+
+      // vertical
+      for (var i = 0; i < 15; i += 1) {
+
+        var mod = (!test && ( (bits >> i) & 1) == 1);
+
+        if (i < 6) {
+          _modules[i][8] = mod;
+        } else if (i < 8) {
+          _modules[i + 1][8] = mod;
+        } else {
+          _modules[_moduleCount - 15 + i][8] = mod;
+        }
+      }
+
+      // horizontal
+      for (var i = 0; i < 15; i += 1) {
+
+        var mod = (!test && ( (bits >> i) & 1) == 1);
+
+        if (i < 8) {
+          _modules[8][_moduleCount - i - 1] = mod;
+        } else if (i < 9) {
+          _modules[8][15 - i - 1 + 1] = mod;
+        } else {
+          _modules[8][15 - i - 1] = mod;
+        }
+      }
+
+      // fixed module
+      _modules[_moduleCount - 8][8] = (!test);
+    };
+
+    var mapData = function(data, maskPattern) {
+
+      var inc = -1;
+      var row = _moduleCount - 1;
+      var bitIndex = 7;
+      var byteIndex = 0;
+      var maskFunc = QRUtil.getMaskFunction(maskPattern);
+
+      for (var col = _moduleCount - 1; col > 0; col -= 2) {
+
+        if (col == 6) col -= 1;
+
+        while (true) {
+
+          for (var c = 0; c < 2; c += 1) {
+
+            if (_modules[row][col - c] == null) {
+
+              var dark = false;
+
+              if (byteIndex < data.length) {
+                dark = ( ( (data[byteIndex] >>> bitIndex) & 1) == 1);
+              }
+
+              var mask = maskFunc(row, col - c);
+
+              if (mask) {
+                dark = !dark;
+              }
+
+              _modules[row][col - c] = dark;
+              bitIndex -= 1;
+
+              if (bitIndex == -1) {
+                byteIndex += 1;
+                bitIndex = 7;
+              }
+            }
+          }
+
+          row += inc;
+
+          if (row < 0 || _moduleCount <= row) {
+            row -= inc;
+            inc = -inc;
+            break;
+          }
+        }
+      }
+    };
+
+    var createBytes = function(buffer, rsBlocks) {
+
+      var offset = 0;
+
+      var maxDcCount = 0;
+      var maxEcCount = 0;
+
+      var dcdata = new Array(rsBlocks.length);
+      var ecdata = new Array(rsBlocks.length);
+
+      for (var r = 0; r < rsBlocks.length; r += 1) {
+
+        var dcCount = rsBlocks[r].dataCount;
+        var ecCount = rsBlocks[r].totalCount - dcCount;
+
+        maxDcCount = Math.max(maxDcCount, dcCount);
+        maxEcCount = Math.max(maxEcCount, ecCount);
+
+        dcdata[r] = new Array(dcCount);
+
+        for (var i = 0; i < dcdata[r].length; i += 1) {
+          dcdata[r][i] = 0xff & buffer.getBuffer()[i + offset];
+        }
+        offset += dcCount;
+
+        var rsPoly = QRUtil.getErrorCorrectPolynomial(ecCount);
+        var rawPoly = qrPolynomial(dcdata[r], rsPoly.getLength() - 1);
+
+        var modPoly = rawPoly.mod(rsPoly);
+        ecdata[r] = new Array(rsPoly.getLength() - 1);
+        for (var i = 0; i < ecdata[r].length; i += 1) {
+          var modIndex = i + modPoly.getLength() - ecdata[r].length;
+          ecdata[r][i] = (modIndex >= 0)? modPoly.getAt(modIndex) : 0;
+        }
+      }
+
+      var totalCodeCount = 0;
+      for (var i = 0; i < rsBlocks.length; i += 1) {
+        totalCodeCount += rsBlocks[i].totalCount;
+      }
+
+      var data = new Array(totalCodeCount);
+      var index = 0;
+
+      for (var i = 0; i < maxDcCount; i += 1) {
+        for (var r = 0; r < rsBlocks.length; r += 1) {
+          if (i < dcdata[r].length) {
+            data[index] = dcdata[r][i];
+            index += 1;
+          }
+        }
+      }
+
+      for (var i = 0; i < maxEcCount; i += 1) {
+        for (var r = 0; r < rsBlocks.length; r += 1) {
+          if (i < ecdata[r].length) {
+            data[index] = ecdata[r][i];
+            index += 1;
+          }
+        }
+      }
+
+      return data;
+    };
+
+    var createData = function(typeNumber, errorCorrectionLevel, dataList) {
+
+      var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, errorCorrectionLevel);
+
+      var buffer = qrBitBuffer();
+
+      for (var i = 0; i < dataList.length; i += 1) {
+        var data = dataList[i];
+        buffer.put(data.getMode(), 4);
+        buffer.put(data.getLength(), QRUtil.getLengthInBits(data.getMode(), typeNumber) );
+        data.write(buffer);
+      }
+
+      // calc num max data.
+      var totalDataCount = 0;
+      for (var i = 0; i < rsBlocks.length; i += 1) {
+        totalDataCount += rsBlocks[i].dataCount;
+      }
+
+      if (buffer.getLengthInBits() > totalDataCount * 8) {
+        throw 'code length overflow. ('
+          + buffer.getLengthInBits()
+          + '>'
+          + totalDataCount * 8
+          + ')';
+      }
+
+      // end code
+      if (buffer.getLengthInBits() + 4 <= totalDataCount * 8) {
+        buffer.put(0, 4);
+      }
+
+      // padding
+      while (buffer.getLengthInBits() % 8 != 0) {
+        buffer.putBit(false);
+      }
+
+      // padding
+      while (true) {
+
+        if (buffer.getLengthInBits() >= totalDataCount * 8) {
+          break;
+        }
+        buffer.put(PAD0, 8);
+
+        if (buffer.getLengthInBits() >= totalDataCount * 8) {
+          break;
+        }
+        buffer.put(PAD1, 8);
+      }
+
+      return createBytes(buffer, rsBlocks);
+    };
+
+    _this.addData = function(data, mode) {
+
+      mode = mode || 'Byte';
+
+      var newData = null;
+
+      switch(mode) {
+      case 'Numeric' :
+        newData = qrNumber(data);
+        break;
+      case 'Alphanumeric' :
+        newData = qrAlphaNum(data);
+        break;
+      case 'Byte' :
+        newData = qr8BitByte(data);
+        break;
+      case 'Kanji' :
+        newData = qrKanji(data);
+        break;
+      default :
+        throw 'mode:' + mode;
+      }
+
+      _dataList.push(newData);
+      _dataCache = null;
+    };
+
+    _this.isDark = function(row, col) {
+      if (row < 0 || _moduleCount <= row || col < 0 || _moduleCount <= col) {
+        throw row + ',' + col;
+      }
+      return _modules[row][col];
+    };
+
+    _this.getModuleCount = function() {
+      return _moduleCount;
+    };
+
+    _this.make = function() {
+      if (_typeNumber < 1) {
+        var typeNumber = 1;
+
+        for (; typeNumber < 40; typeNumber++) {
+          var rsBlocks = QRRSBlock.getRSBlocks(typeNumber, _errorCorrectionLevel);
+          var buffer = qrBitBuffer();
+
+          for (var i = 0; i < _dataList.length; i++) {
+            var data = _dataList[i];
+            buffer.put(data.getMode(), 4);
+            buffer.put(data.getLength(), QRUtil.getLengthInBits(data.getMode(), typeNumber) );
+            data.write(buffer);
+          }
+
+          var totalDataCount = 0;
+          for (var i = 0; i < rsBlocks.length; i++) {
+            totalDataCount += rsBlocks[i].dataCount;
+          }
+
+          if (buffer.getLengthInBits() <= totalDataCount * 8) {
+            break;
+          }
+        }
+
+        _typeNumber = typeNumber;
+      }
+
+      makeImpl(false, getBestMaskPattern() );
+    };
+
+    _this.createTableTag = function(cellSize, margin) {
+
+      cellSize = cellSize || 2;
+      margin = (typeof margin == 'undefined')? cellSize * 4 : margin;
+
+      var qrHtml = '';
+
+      qrHtml += '<table style="';
+      qrHtml += ' border-width: 0px; border-style: none;';
+      qrHtml += ' border-collapse: collapse;';
+      qrHtml += ' padding: 0px; margin: ' + margin + 'px;';
+      qrHtml += '">';
+      qrHtml += '<tbody>';
+
+      for (var r = 0; r < _this.getModuleCount(); r += 1) {
+
+        qrHtml += '<tr>';
+
+        for (var c = 0; c < _this.getModuleCount(); c += 1) {
+          qrHtml += '<td style="';
+          qrHtml += ' border-width: 0px; border-style: none;';
+          qrHtml += ' border-collapse: collapse;';
+          qrHtml += ' padding: 0px; margin: 0px;';
+          qrHtml += ' width: ' + cellSize + 'px;';
+          qrHtml += ' height: ' + cellSize + 'px;';
+          qrHtml += ' background-color: ';
+          qrHtml += _this.isDark(r, c)? '#000000' : '#ffffff';
+          qrHtml += ';';
+          qrHtml += '"/>';
+        }
+
+        qrHtml += '</tr>';
+      }
+
+      qrHtml += '</tbody>';
+      qrHtml += '</table>';
+
+      return qrHtml;
+    };
+
+    _this.createSvgTag = function(cellSize, margin, alt, title) {
+
+      var opts = {};
+      if (typeof arguments[0] == 'object') {
+        // Called by options.
+        opts = arguments[0];
+        // overwrite cellSize and margin.
+        cellSize = opts.cellSize;
+        margin = opts.margin;
+        alt = opts.alt;
+        title = opts.title;
+      }
+
+      cellSize = cellSize || 2;
+      margin = (typeof margin == 'undefined')? cellSize * 4 : margin;
+
+      // Compose alt property surrogate
+      alt = (typeof alt === 'string') ? {text: alt} : alt || {};
+      alt.text = alt.text || null;
+      alt.id = (alt.text) ? alt.id || 'qrcode-description' : null;
+
+      // Compose title property surrogate
+      title = (typeof title === 'string') ? {text: title} : title || {};
+      title.text = title.text || null;
+      title.id = (title.text) ? title.id || 'qrcode-title' : null;
+
+      var size = _this.getModuleCount() * cellSize + margin * 2;
+      var c, mc, r, mr, qrSvg='', rect;
+
+      rect = 'l' + cellSize + ',0 0,' + cellSize +
+        ' -' + cellSize + ',0 0,-' + cellSize + 'z ';
+
+      qrSvg += '<svg version="1.1" xmlns="http://www.w3.org/2000/svg"';
+      qrSvg += !opts.scalable ? ' width="' + size + 'px" height="' + size + 'px"' : '';
+      qrSvg += ' viewBox="0 0 ' + size + ' ' + size + '" ';
+      qrSvg += ' preserveAspectRatio="xMinYMin meet"';
+      qrSvg += (title.text || alt.text) ? ' role="img" aria-labelledby="' +
+          escapeXml([title.id, alt.id].join(' ').trim() ) + '"' : '';
+      qrSvg += '>';
+      qrSvg += (title.text) ? '<title id="' + escapeXml(title.id) + '">' +
+          escapeXml(title.text) + '</title>' : '';
+      qrSvg += (alt.text) ? '<description id="' + escapeXml(alt.id) + '">' +
+          escapeXml(alt.text) + '</description>' : '';
+      qrSvg += '<rect width="100%" height="100%" fill="white" cx="0" cy="0"/>';
+      qrSvg += '<path d="';
+
+      for (r = 0; r < _this.getModuleCount(); r += 1) {
+        mr = r * cellSize + margin;
+        for (c = 0; c < _this.getModuleCount(); c += 1) {
+          if (_this.isDark(r, c) ) {
+            mc = c*cellSize+margin;
+            qrSvg += 'M' + mc + ',' + mr + rect;
+          }
+        }
+      }
+
+      qrSvg += '" stroke="transparent" fill="black"/>';
+      qrSvg += '</svg>';
+
+      return qrSvg;
+    };
+
+    _this.createDataURL = function(cellSize, margin) {
+
+      cellSize = cellSize || 2;
+      margin = (typeof margin == 'undefined')? cellSize * 4 : margin;
+
+      var size = _this.getModuleCount() * cellSize + margin * 2;
+      var min = margin;
+      var max = size - margin;
+
+      return createDataURL(size, size, function(x, y) {
+        if (min <= x && x < max && min <= y && y < max) {
+          var c = Math.floor( (x - min) / cellSize);
+          var r = Math.floor( (y - min) / cellSize);
+          return _this.isDark(r, c)? 0 : 1;
+        } else {
+          return 1;
+        }
+      } );
+    };
+
+    _this.createImgTag = function(cellSize, margin, alt) {
+
+      cellSize = cellSize || 2;
+      margin = (typeof margin == 'undefined')? cellSize * 4 : margin;
+
+      var size = _this.getModuleCount() * cellSize + margin * 2;
+
+      var img = '';
+      img += '<img';
+      img += '\u0020src="';
+      img += _this.createDataURL(cellSize, margin);
+      img += '"';
+      img += '\u0020width="';
+      img += size;
+      img += '"';
+      img += '\u0020height="';
+      img += size;
+      img += '"';
+      if (alt) {
+        img += '\u0020alt="';
+        img += escapeXml(alt);
+        img += '"';
+      }
+      img += '/>';
+
+      return img;
+    };
+
+    var escapeXml = function(s) {
+      var escaped = '';
+      for (var i = 0; i < s.length; i += 1) {
+        var c = s.charAt(i);
+        switch(c) {
+        case '<': escaped += '&lt;'; break;
+        case '>': escaped += '&gt;'; break;
+        case '&': escaped += '&amp;'; break;
+        case '"': escaped += '&quot;'; break;
+        default : escaped += c; break;
+        }
+      }
+      return escaped;
+    };
+
+    var _createHalfASCII = function(margin) {
+      var cellSize = 1;
+      margin = (typeof margin == 'undefined')? cellSize * 2 : margin;
+
+      var size = _this.getModuleCount() * cellSize + margin * 2;
+      var min = margin;
+      var max = size - margin;
+
+      var y, x, r1, r2, p;
+
+      var blocks = {
+        '██': '█',
+        '█ ': '▀',
+        ' █': '▄',
+        '  ': ' '
+      };
+
+      var blocksLastLineNoMargin = {
+        '██': '▀',
+        '█ ': '▀',
+        ' █': ' ',
+        '  ': ' '
+      };
+
+      var ascii = '';
+      for (y = 0; y < size; y += 2) {
+        r1 = Math.floor((y - min) / cellSize);
+        r2 = Math.floor((y + 1 - min) / cellSize);
+        for (x = 0; x < size; x += 1) {
+          p = '█';
+
+          if (min <= x && x < max && min <= y && y < max && _this.isDark(r1, Math.floor((x - min) / cellSize))) {
+            p = ' ';
+          }
+
+          if (min <= x && x < max && min <= y+1 && y+1 < max && _this.isDark(r2, Math.floor((x - min) / cellSize))) {
+            p += ' ';
+          }
+          else {
+            p += '█';
+          }
+
+          // Output 2 characters per pixel, to create full square. 1 character per pixels gives only half width of square.
+          ascii += (margin < 1 && y+1 >= max) ? blocksLastLineNoMargin[p] : blocks[p];
+        }
+
+        ascii += '\n';
+      }
+
+      if (size % 2 && margin > 0) {
+        return ascii.substring(0, ascii.length - size - 1) + Array(size+1).join('▀');
+      }
+
+      return ascii.substring(0, ascii.length-1);
+    };
+
+    _this.createASCII = function(cellSize, margin) {
+      cellSize = cellSize || 1;
+
+      if (cellSize < 2) {
+        return _createHalfASCII(margin);
+      }
+
+      cellSize -= 1;
+      margin = (typeof margin == 'undefined')? cellSize * 2 : margin;
+
+      var size = _this.getModuleCount() * cellSize + margin * 2;
+      var min = margin;
+      var max = size - margin;
+
+      var y, x, r, p;
+
+      var white = Array(cellSize+1).join('██');
+      var black = Array(cellSize+1).join('  ');
+
+      var ascii = '';
+      var line = '';
+      for (y = 0; y < size; y += 1) {
+        r = Math.floor( (y - min) / cellSize);
+        line = '';
+        for (x = 0; x < size; x += 1) {
+          p = 1;
+
+          if (min <= x && x < max && min <= y && y < max && _this.isDark(r, Math.floor((x - min) / cellSize))) {
+            p = 0;
+          }
+
+          // Output 2 characters per pixel, to create full square. 1 character per pixels gives only half width of square.
+          line += p ? white : black;
+        }
+
+        for (r = 0; r < cellSize; r += 1) {
+          ascii += line + '\n';
+        }
+      }
+
+      return ascii.substring(0, ascii.length-1);
+    };
+
+    _this.renderTo2dContext = function(context, cellSize) {
+      cellSize = cellSize || 2;
+      var length = _this.getModuleCount();
+      for (var row = 0; row < length; row++) {
+        for (var col = 0; col < length; col++) {
+          context.fillStyle = _this.isDark(row, col) ? 'black' : 'white';
+          context.fillRect(row * cellSize, col * cellSize, cellSize, cellSize);
+        }
+      }
+    }
+
+    return _this;
+  };
+
+  //---------------------------------------------------------------------
+  // qrcode.stringToBytes
+  //---------------------------------------------------------------------
+
+  qrcode.stringToBytesFuncs = {
+    'default' : function(s) {
+      var bytes = [];
+      for (var i = 0; i < s.length; i += 1) {
+        var c = s.charCodeAt(i);
+        bytes.push(c & 0xff);
+      }
+      return bytes;
+    }
+  };
+
+  qrcode.stringToBytes = qrcode.stringToBytesFuncs['default'];
+
+  //---------------------------------------------------------------------
+  // qrcode.createStringToBytes
+  //---------------------------------------------------------------------
+
+  /**
+   * @param unicodeData base64 string of byte array.
+   * [16bit Unicode],[16bit Bytes], ...
+   * @param numChars
+   */
+  qrcode.createStringToBytes = function(unicodeData, numChars) {
+
+    // create conversion map.
+
+    var unicodeMap = function() {
+
+      var bin = base64DecodeInputStream(unicodeData);
+      var read = function() {
+        var b = bin.read();
+        if (b == -1) throw 'eof';
+        return b;
+      };
+
+      var count = 0;
+      var unicodeMap = {};
+      while (true) {
+        var b0 = bin.read();
+        if (b0 == -1) break;
+        var b1 = read();
+        var b2 = read();
+        var b3 = read();
+        var k = String.fromCharCode( (b0 << 8) | b1);
+        var v = (b2 << 8) | b3;
+        unicodeMap[k] = v;
+        count += 1;
+      }
+      if (count != numChars) {
+        throw count + ' != ' + numChars;
+      }
+
+      return unicodeMap;
+    }();
+
+    var unknownChar = '?'.charCodeAt(0);
+
+    return function(s) {
+      var bytes = [];
+      for (var i = 0; i < s.length; i += 1) {
+        var c = s.charCodeAt(i);
+        if (c < 128) {
+          bytes.push(c);
+        } else {
+          var b = unicodeMap[s.charAt(i)];
+          if (typeof b == 'number') {
+            if ( (b & 0xff) == b) {
+              // 1byte
+              bytes.push(b);
+            } else {
+              // 2bytes
+              bytes.push(b >>> 8);
+              bytes.push(b & 0xff);
+            }
+          } else {
+            bytes.push(unknownChar);
+          }
+        }
+      }
+      return bytes;
+    };
+  };
+
+  //---------------------------------------------------------------------
+  // QRMode
+  //---------------------------------------------------------------------
+
+  var QRMode = {
+    MODE_NUMBER :    1 << 0,
+    MODE_ALPHA_NUM : 1 << 1,
+    MODE_8BIT_BYTE : 1 << 2,
+    MODE_KANJI :     1 << 3
+  };
+
+  //---------------------------------------------------------------------
+  // QRErrorCorrectionLevel
+  //---------------------------------------------------------------------
+
+  var QRErrorCorrectionLevel = {
+    L : 1,
+    M : 0,
+    Q : 3,
+    H : 2
+  };
+
+  //---------------------------------------------------------------------
+  // QRMaskPattern
+  //---------------------------------------------------------------------
+
+  var QRMaskPattern = {
+    PATTERN000 : 0,
+    PATTERN001 : 1,
+    PATTERN010 : 2,
+    PATTERN011 : 3,
+    PATTERN100 : 4,
+    PATTERN101 : 5,
+    PATTERN110 : 6,
+    PATTERN111 : 7
+  };
+
+  //---------------------------------------------------------------------
+  // QRUtil
+  //---------------------------------------------------------------------
+
+  var QRUtil = function() {
+
+    var PATTERN_POSITION_TABLE = [
+      [],
+      [6, 18],
+      [6, 22],
+      [6, 26],
+      [6, 30],
+      [6, 34],
+      [6, 22, 38],
+      [6, 24, 42],
+      [6, 26, 46],
+      [6, 28, 50],
+      [6, 30, 54],
+      [6, 32, 58],
+      [6, 34, 62],
+      [6, 26, 46, 66],
+      [6, 26, 48, 70],
+      [6, 26, 50, 74],
+      [6, 30, 54, 78],
+      [6, 30, 56, 82],
+      [6, 30, 58, 86],
+      [6, 34, 62, 90],
+      [6, 28, 50, 72, 94],
+      [6, 26, 50, 74, 98],
+      [6, 30, 54, 78, 102],
+      [6, 28, 54, 80, 106],
+      [6, 32, 58, 84, 110],
+      [6, 30, 58, 86, 114],
+      [6, 34, 62, 90, 118],
+      [6, 26, 50, 74, 98, 122],
+      [6, 30, 54, 78, 102, 126],
+      [6, 26, 52, 78, 104, 130],
+      [6, 30, 56, 82, 108, 134],
+      [6, 34, 60, 86, 112, 138],
+      [6, 30, 58, 86, 114, 142],
+      [6, 34, 62, 90, 118, 146],
+      [6, 30, 54, 78, 102, 126, 150],
+      [6, 24, 50, 76, 102, 128, 154],
+      [6, 28, 54, 80, 106, 132, 158],
+      [6, 32, 58, 84, 110, 136, 162],
+      [6, 26, 54, 82, 110, 138, 166],
+      [6, 30, 58, 86, 114, 142, 170]
+    ];
+    var G15 = (1 << 10) | (1 << 8) | (1 << 5) | (1 << 4) | (1 << 2) | (1 << 1) | (1 << 0);
+    var G18 = (1 << 12) | (1 << 11) | (1 << 10) | (1 << 9) | (1 << 8) | (1 << 5) | (1 << 2) | (1 << 0);
+    var G15_MASK = (1 << 14) | (1 << 12) | (1 << 10) | (1 << 4) | (1 << 1);
+
+    var _this = {};
+
+    var getBCHDigit = function(data) {
+      var digit = 0;
+      while (data != 0) {
+        digit += 1;
+        data >>>= 1;
+      }
+      return digit;
+    };
+
+    _this.getBCHTypeInfo = function(data) {
+      var d = data << 10;
+      while (getBCHDigit(d) - getBCHDigit(G15) >= 0) {
+        d ^= (G15 << (getBCHDigit(d) - getBCHDigit(G15) ) );
+      }
+      return ( (data << 10) | d) ^ G15_MASK;
+    };
+
+    _this.getBCHTypeNumber = function(data) {
+      var d = data << 12;
+      while (getBCHDigit(d) - getBCHDigit(G18) >= 0) {
+        d ^= (G18 << (getBCHDigit(d) - getBCHDigit(G18) ) );
+      }
+      return (data << 12) | d;
+    };
+
+    _this.getPatternPosition = function(typeNumber) {
+      return PATTERN_POSITION_TABLE[typeNumber - 1];
+    };
+
+    _this.getMaskFunction = function(maskPattern) {
+
+      switch (maskPattern) {
+
+      case QRMaskPattern.PATTERN000 :
+        return function(i, j) { return (i + j) % 2 == 0; };
+      case QRMaskPattern.PATTERN001 :
+        return function(i, j) { return i % 2 == 0; };
+      case QRMaskPattern.PATTERN010 :
+        return function(i, j) { return j % 3 == 0; };
+      case QRMaskPattern.PATTERN011 :
+        return function(i, j) { return (i + j) % 3 == 0; };
+      case QRMaskPattern.PATTERN100 :
+        return function(i, j) { return (Math.floor(i / 2) + Math.floor(j / 3) ) % 2 == 0; };
+      case QRMaskPattern.PATTERN101 :
+        return function(i, j) { return (i * j) % 2 + (i * j) % 3 == 0; };
+      case QRMaskPattern.PATTERN110 :
+        return function(i, j) { return ( (i * j) % 2 + (i * j) % 3) % 2 == 0; };
+      case QRMaskPattern.PATTERN111 :
+        return function(i, j) { return ( (i * j) % 3 + (i + j) % 2) % 2 == 0; };
+
+      default :
+        throw 'bad maskPattern:' + maskPattern;
+      }
+    };
+
+    _this.getErrorCorrectPolynomial = function(errorCorrectLength) {
+      var a = qrPolynomial([1], 0);
+      for (var i = 0; i < errorCorrectLength; i += 1) {
+        a = a.multiply(qrPolynomial([1, QRMath.gexp(i)], 0) );
+      }
+      return a;
+    };
+
+    _this.getLengthInBits = function(mode, type) {
+
+      if (1 <= type && type < 10) {
+
+        // 1 - 9
+
+        switch(mode) {
+        case QRMode.MODE_NUMBER    : return 10;
+        case QRMode.MODE_ALPHA_NUM : return 9;
+        case QRMode.MODE_8BIT_BYTE : return 8;
+        case QRMode.MODE_KANJI     : return 8;
+        default :
+          throw 'mode:' + mode;
+        }
+
+      } else if (type < 27) {
+
+        // 10 - 26
+
+        switch(mode) {
+        case QRMode.MODE_NUMBER    : return 12;
+        case QRMode.MODE_ALPHA_NUM : return 11;
+        case QRMode.MODE_8BIT_BYTE : return 16;
+        case QRMode.MODE_KANJI     : return 10;
+        default :
+          throw 'mode:' + mode;
+        }
+
+      } else if (type < 41) {
+
+        // 27 - 40
+
+        switch(mode) {
+        case QRMode.MODE_NUMBER    : return 14;
+        case QRMode.MODE_ALPHA_NUM : return 13;
+        case QRMode.MODE_8BIT_BYTE : return 16;
+        case QRMode.MODE_KANJI     : return 12;
+        default :
+          throw 'mode:' + mode;
+        }
+
+      } else {
+        throw 'type:' + type;
+      }
+    };
+
+    _this.getLostPoint = function(qrcode) {
+
+      var moduleCount = qrcode.getModuleCount();
+
+      var lostPoint = 0;
+
+      // LEVEL1
+
+      for (var row = 0; row < moduleCount; row += 1) {
+        for (var col = 0; col < moduleCount; col += 1) {
+
+          var sameCount = 0;
+          var dark = qrcode.isDark(row, col);
+
+          for (var r = -1; r <= 1; r += 1) {
+
+            if (row + r < 0 || moduleCount <= row + r) {
+              continue;
+            }
+
+            for (var c = -1; c <= 1; c += 1) {
+
+              if (col + c < 0 || moduleCount <= col + c) {
+                continue;
+              }
+
+              if (r == 0 && c == 0) {
+                continue;
+              }
+
+              if (dark == qrcode.isDark(row + r, col + c) ) {
+                sameCount += 1;
+              }
+            }
+          }
+
+          if (sameCount > 5) {
+            lostPoint += (3 + sameCount - 5);
+          }
+        }
+      };
+
+      // LEVEL2
+
+      for (var row = 0; row < moduleCount - 1; row += 1) {
+        for (var col = 0; col < moduleCount - 1; col += 1) {
+          var count = 0;
+          if (qrcode.isDark(row, col) ) count += 1;
+          if (qrcode.isDark(row + 1, col) ) count += 1;
+          if (qrcode.isDark(row, col + 1) ) count += 1;
+          if (qrcode.isDark(row + 1, col + 1) ) count += 1;
+          if (count == 0 || count == 4) {
+            lostPoint += 3;
+          }
+        }
+      }
+
+      // LEVEL3
+
+      for (var row = 0; row < moduleCount; row += 1) {
+        for (var col = 0; col < moduleCount - 6; col += 1) {
+          if (qrcode.isDark(row, col)
+              && !qrcode.isDark(row, col + 1)
+              &&  qrcode.isDark(row, col + 2)
+              &&  qrcode.isDark(row, col + 3)
+              &&  qrcode.isDark(row, col + 4)
+              && !qrcode.isDark(row, col + 5)
+              &&  qrcode.isDark(row, col + 6) ) {
+            lostPoint += 40;
+          }
+        }
+      }
+
+      for (var col = 0; col < moduleCount; col += 1) {
+        for (var row = 0; row < moduleCount - 6; row += 1) {
+          if (qrcode.isDark(row, col)
+              && !qrcode.isDark(row + 1, col)
+              &&  qrcode.isDark(row + 2, col)
+              &&  qrcode.isDark(row + 3, col)
+              &&  qrcode.isDark(row + 4, col)
+              && !qrcode.isDark(row + 5, col)
+              &&  qrcode.isDark(row + 6, col) ) {
+            lostPoint += 40;
+          }
+        }
+      }
+
+      // LEVEL4
+
+      var darkCount = 0;
+
+      for (var col = 0; col < moduleCount; col += 1) {
+        for (var row = 0; row < moduleCount; row += 1) {
+          if (qrcode.isDark(row, col) ) {
+            darkCount += 1;
+          }
+        }
+      }
+
+      var ratio = Math.abs(100 * darkCount / moduleCount / moduleCount - 50) / 5;
+      lostPoint += ratio * 10;
+
+      return lostPoint;
+    };
+
+    return _this;
+  }();
+
+  //---------------------------------------------------------------------
+  // QRMath
+  //---------------------------------------------------------------------
+
+  var QRMath = function() {
+
+    var EXP_TABLE = new Array(256);
+    var LOG_TABLE = new Array(256);
+
+    // initialize tables
+    for (var i = 0; i < 8; i += 1) {
+      EXP_TABLE[i] = 1 << i;
+    }
+    for (var i = 8; i < 256; i += 1) {
+      EXP_TABLE[i] = EXP_TABLE[i - 4]
+        ^ EXP_TABLE[i - 5]
+        ^ EXP_TABLE[i - 6]
+        ^ EXP_TABLE[i - 8];
+    }
+    for (var i = 0; i < 255; i += 1) {
+      LOG_TABLE[EXP_TABLE[i] ] = i;
+    }
+
+    var _this = {};
+
+    _this.glog = function(n) {
+
+      if (n < 1) {
+        throw 'glog(' + n + ')';
+      }
+
+      return LOG_TABLE[n];
+    };
+
+    _this.gexp = function(n) {
+
+      while (n < 0) {
+        n += 255;
+      }
+
+      while (n >= 256) {
+        n -= 255;
+      }
+
+      return EXP_TABLE[n];
+    };
+
+    return _this;
+  }();
+
+  //---------------------------------------------------------------------
+  // qrPolynomial
+  //---------------------------------------------------------------------
+
+  function qrPolynomial(num, shift) {
+
+    if (typeof num.length == 'undefined') {
+      throw num.length + '/' + shift;
+    }
+
+    var _num = function() {
+      var offset = 0;
+      while (offset < num.length && num[offset] == 0) {
+        offset += 1;
+      }
+      var _num = new Array(num.length - offset + shift);
+      for (var i = 0; i < num.length - offset; i += 1) {
+        _num[i] = num[i + offset];
+      }
+      return _num;
+    }();
+
+    var _this = {};
+
+    _this.getAt = function(index) {
+      return _num[index];
+    };
+
+    _this.getLength = function() {
+      return _num.length;
+    };
+
+    _this.multiply = function(e) {
+
+      var num = new Array(_this.getLength() + e.getLength() - 1);
+
+      for (var i = 0; i < _this.getLength(); i += 1) {
+        for (var j = 0; j < e.getLength(); j += 1) {
+          num[i + j] ^= QRMath.gexp(QRMath.glog(_this.getAt(i) ) + QRMath.glog(e.getAt(j) ) );
+        }
+      }
+
+      return qrPolynomial(num, 0);
+    };
+
+    _this.mod = function(e) {
+
+      if (_this.getLength() - e.getLength() < 0) {
+        return _this;
+      }
+
+      var ratio = QRMath.glog(_this.getAt(0) ) - QRMath.glog(e.getAt(0) );
+
+      var num = new Array(_this.getLength() );
+      for (var i = 0; i < _this.getLength(); i += 1) {
+        num[i] = _this.getAt(i);
+      }
+
+      for (var i = 0; i < e.getLength(); i += 1) {
+        num[i] ^= QRMath.gexp(QRMath.glog(e.getAt(i) ) + ratio);
+      }
+
+      // recursive call
+      return qrPolynomial(num, 0).mod(e);
+    };
+
+    return _this;
+  };
+
+  //---------------------------------------------------------------------
+  // QRRSBlock
+  //---------------------------------------------------------------------
+
+  var QRRSBlock = function() {
+
+    var RS_BLOCK_TABLE = [
+
+      // L
+      // M
+      // Q
+      // H
+
+      // 1
+      [1, 26, 19],
+      [1, 26, 16],
+      [1, 26, 13],
+      [1, 26, 9],
+
+      // 2
+      [1, 44, 34],
+      [1, 44, 28],
+      [1, 44, 22],
+      [1, 44, 16],
+
+      // 3
+      [1, 70, 55],
+      [1, 70, 44],
+      [2, 35, 17],
+      [2, 35, 13],
+
+      // 4
+      [1, 100, 80],
+      [2, 50, 32],
+      [2, 50, 24],
+      [4, 25, 9],
+
+      // 5
+      [1, 134, 108],
+      [2, 67, 43],
+      [2, 33, 15, 2, 34, 16],
+      [2, 33, 11, 2, 34, 12],
+
+      // 6
+      [2, 86, 68],
+      [4, 43, 27],
+      [4, 43, 19],
+      [4, 43, 15],
+
+      // 7
+      [2, 98, 78],
+      [4, 49, 31],
+      [2, 32, 14, 4, 33, 15],
+      [4, 39, 13, 1, 40, 14],
+
+      // 8
+      [2, 121, 97],
+      [2, 60, 38, 2, 61, 39],
+      [4, 40, 18, 2, 41, 19],
+      [4, 40, 14, 2, 41, 15],
+
+      // 9
+      [2, 146, 116],
+      [3, 58, 36, 2, 59, 37],
+      [4, 36, 16, 4, 37, 17],
+      [4, 36, 12, 4, 37, 13],
+
+      // 10
+      [2, 86, 68, 2, 87, 69],
+      [4, 69, 43, 1, 70, 44],
+      [6, 43, 19, 2, 44, 20],
+      [6, 43, 15, 2, 44, 16],
+
+      // 11
+      [4, 101, 81],
+      [1, 80, 50, 4, 81, 51],
+      [4, 50, 22, 4, 51, 23],
+      [3, 36, 12, 8, 37, 13],
+
+      // 12
+      [2, 116, 92, 2, 117, 93],
+      [6, 58, 36, 2, 59, 37],
+      [4, 46, 20, 6, 47, 21],
+      [7, 42, 14, 4, 43, 15],
+
+      // 13
+      [4, 133, 107],
+      [8, 59, 37, 1, 60, 38],
+      [8, 44, 20, 4, 45, 21],
+      [12, 33, 11, 4, 34, 12],
+
+      // 14
+      [3, 145, 115, 1, 146, 116],
+      [4, 64, 40, 5, 65, 41],
+      [11, 36, 16, 5, 37, 17],
+      [11, 36, 12, 5, 37, 13],
+
+      // 15
+      [5, 109, 87, 1, 110, 88],
+      [5, 65, 41, 5, 66, 42],
+      [5, 54, 24, 7, 55, 25],
+      [11, 36, 12, 7, 37, 13],
+
+      // 16
+      [5, 122, 98, 1, 123, 99],
+      [7, 73, 45, 3, 74, 46],
+      [15, 43, 19, 2, 44, 20],
+      [3, 45, 15, 13, 46, 16],
+
+      // 17
+      [1, 135, 107, 5, 136, 108],
+      [10, 74, 46, 1, 75, 47],
+      [1, 50, 22, 15, 51, 23],
+      [2, 42, 14, 17, 43, 15],
+
+      // 18
+      [5, 150, 120, 1, 151, 121],
+      [9, 69, 43, 4, 70, 44],
+      [17, 50, 22, 1, 51, 23],
+      [2, 42, 14, 19, 43, 15],
+
+      // 19
+      [3, 141, 113, 4, 142, 114],
+      [3, 70, 44, 11, 71, 45],
+      [17, 47, 21, 4, 48, 22],
+      [9, 39, 13, 16, 40, 14],
+
+      // 20
+      [3, 135, 107, 5, 136, 108],
+      [3, 67, 41, 13, 68, 42],
+      [15, 54, 24, 5, 55, 25],
+      [15, 43, 15, 10, 44, 16],
+
+      // 21
+      [4, 144, 116, 4, 145, 117],
+      [17, 68, 42],
+      [17, 50, 22, 6, 51, 23],
+      [19, 46, 16, 6, 47, 17],
+
+      // 22
+      [2, 139, 111, 7, 140, 112],
+      [17, 74, 46],
+      [7, 54, 24, 16, 55, 25],
+      [34, 37, 13],
+
+      // 23
+      [4, 151, 121, 5, 152, 122],
+      [4, 75, 47, 14, 76, 48],
+      [11, 54, 24, 14, 55, 25],
+      [16, 45, 15, 14, 46, 16],
+
+      // 24
+      [6, 147, 117, 4, 148, 118],
+      [6, 73, 45, 14, 74, 46],
+      [11, 54, 24, 16, 55, 25],
+      [30, 46, 16, 2, 47, 17],
+
+      // 25
+      [8, 132, 106, 4, 133, 107],
+      [8, 75, 47, 13, 76, 48],
+      [7, 54, 24, 22, 55, 25],
+      [22, 45, 15, 13, 46, 16],
+
+      // 26
+      [10, 142, 114, 2, 143, 115],
+      [19, 74, 46, 4, 75, 47],
+      [28, 50, 22, 6, 51, 23],
+      [33, 46, 16, 4, 47, 17],
+
+      // 27
+      [8, 152, 122, 4, 153, 123],
+      [22, 73, 45, 3, 74, 46],
+      [8, 53, 23, 26, 54, 24],
+      [12, 45, 15, 28, 46, 16],
+
+      // 28
+      [3, 147, 117, 10, 148, 118],
+      [3, 73, 45, 23, 74, 46],
+      [4, 54, 24, 31, 55, 25],
+      [11, 45, 15, 31, 46, 16],
+
+      // 29
+      [7, 146, 116, 7, 147, 117],
+      [21, 73, 45, 7, 74, 46],
+      [1, 53, 23, 37, 54, 24],
+      [19, 45, 15, 26, 46, 16],
+
+      // 30
+      [5, 145, 115, 10, 146, 116],
+      [19, 75, 47, 10, 76, 48],
+      [15, 54, 24, 25, 55, 25],
+      [23, 45, 15, 25, 46, 16],
+
+      // 31
+      [13, 145, 115, 3, 146, 116],
+      [2, 74, 46, 29, 75, 47],
+      [42, 54, 24, 1, 55, 25],
+      [23, 45, 15, 28, 46, 16],
+
+      // 32
+      [17, 145, 115],
+      [10, 74, 46, 23, 75, 47],
+      [10, 54, 24, 35, 55, 25],
+      [19, 45, 15, 35, 46, 16],
+
+      // 33
+      [17, 145, 115, 1, 146, 116],
+      [14, 74, 46, 21, 75, 47],
+      [29, 54, 24, 19, 55, 25],
+      [11, 45, 15, 46, 46, 16],
+
+      // 34
+      [13, 145, 115, 6, 146, 116],
+      [14, 74, 46, 23, 75, 47],
+      [44, 54, 24, 7, 55, 25],
+      [59, 46, 16, 1, 47, 17],
+
+      // 35
+      [12, 151, 121, 7, 152, 122],
+      [12, 75, 47, 26, 76, 48],
+      [39, 54, 24, 14, 55, 25],
+      [22, 45, 15, 41, 46, 16],
+
+      // 36
+      [6, 151, 121, 14, 152, 122],
+      [6, 75, 47, 34, 76, 48],
+      [46, 54, 24, 10, 55, 25],
+      [2, 45, 15, 64, 46, 16],
+
+      // 37
+      [17, 152, 122, 4, 153, 123],
+      [29, 74, 46, 14, 75, 47],
+      [49, 54, 24, 10, 55, 25],
+      [24, 45, 15, 46, 46, 16],
+
+      // 38
+      [4, 152, 122, 18, 153, 123],
+      [13, 74, 46, 32, 75, 47],
+      [48, 54, 24, 14, 55, 25],
+      [42, 45, 15, 32, 46, 16],
+
+      // 39
+      [20, 147, 117, 4, 148, 118],
+      [40, 75, 47, 7, 76, 48],
+      [43, 54, 24, 22, 55, 25],
+      [10, 45, 15, 67, 46, 16],
+
+      // 40
+      [19, 148, 118, 6, 149, 119],
+      [18, 75, 47, 31, 76, 48],
+      [34, 54, 24, 34, 55, 25],
+      [20, 45, 15, 61, 46, 16]
+    ];
+
+    var qrRSBlock = function(totalCount, dataCount) {
+      var _this = {};
+      _this.totalCount = totalCount;
+      _this.dataCount = dataCount;
+      return _this;
+    };
+
+    var _this = {};
+
+    var getRsBlockTable = function(typeNumber, errorCorrectionLevel) {
+
+      switch(errorCorrectionLevel) {
+      case QRErrorCorrectionLevel.L :
+        return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 0];
+      case QRErrorCorrectionLevel.M :
+        return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 1];
+      case QRErrorCorrectionLevel.Q :
+        return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 2];
+      case QRErrorCorrectionLevel.H :
+        return RS_BLOCK_TABLE[(typeNumber - 1) * 4 + 3];
+      default :
+        return undefined;
+      }
+    };
+
+    _this.getRSBlocks = function(typeNumber, errorCorrectionLevel) {
+
+      var rsBlock = getRsBlockTable(typeNumber, errorCorrectionLevel);
+
+      if (typeof rsBlock == 'undefined') {
+        throw 'bad rs block @ typeNumber:' + typeNumber +
+            '/errorCorrectionLevel:' + errorCorrectionLevel;
+      }
+
+      var length = rsBlock.length / 3;
+
+      var list = [];
+
+      for (var i = 0; i < length; i += 1) {
+
+        var count = rsBlock[i * 3 + 0];
+        var totalCount = rsBlock[i * 3 + 1];
+        var dataCount = rsBlock[i * 3 + 2];
+
+        for (var j = 0; j < count; j += 1) {
+          list.push(qrRSBlock(totalCount, dataCount) );
+        }
+      }
+
+      return list;
+    };
+
+    return _this;
+  }();
+
+  //---------------------------------------------------------------------
+  // qrBitBuffer
+  //---------------------------------------------------------------------
+
+  var qrBitBuffer = function() {
+
+    var _buffer = [];
+    var _length = 0;
+
+    var _this = {};
+
+    _this.getBuffer = function() {
+      return _buffer;
+    };
+
+    _this.getAt = function(index) {
+      var bufIndex = Math.floor(index / 8);
+      return ( (_buffer[bufIndex] >>> (7 - index % 8) ) & 1) == 1;
+    };
+
+    _this.put = function(num, length) {
+      for (var i = 0; i < length; i += 1) {
+        _this.putBit( ( (num >>> (length - i - 1) ) & 1) == 1);
+      }
+    };
+
+    _this.getLengthInBits = function() {
+      return _length;
+    };
+
+    _this.putBit = function(bit) {
+
+      var bufIndex = Math.floor(_length / 8);
+      if (_buffer.length <= bufIndex) {
+        _buffer.push(0);
+      }
+
+      if (bit) {
+        _buffer[bufIndex] |= (0x80 >>> (_length % 8) );
+      }
+
+      _length += 1;
+    };
+
+    return _this;
+  };
+
+  //---------------------------------------------------------------------
+  // qrNumber
+  //---------------------------------------------------------------------
+
+  var qrNumber = function(data) {
+
+    var _mode = QRMode.MODE_NUMBER;
+    var _data = data;
+
+    var _this = {};
+
+    _this.getMode = function() {
+      return _mode;
+    };
+
+    _this.getLength = function(buffer) {
+      return _data.length;
+    };
+
+    _this.write = function(buffer) {
+
+      var data = _data;
+
+      var i = 0;
+
+      while (i + 2 < data.length) {
+        buffer.put(strToNum(data.substring(i, i + 3) ), 10);
+        i += 3;
+      }
+
+      if (i < data.length) {
+        if (data.length - i == 1) {
+          buffer.put(strToNum(data.substring(i, i + 1) ), 4);
+        } else if (data.length - i == 2) {
+          buffer.put(strToNum(data.substring(i, i + 2) ), 7);
+        }
+      }
+    };
+
+    var strToNum = function(s) {
+      var num = 0;
+      for (var i = 0; i < s.length; i += 1) {
+        num = num * 10 + chatToNum(s.charAt(i) );
+      }
+      return num;
+    };
+
+    var chatToNum = function(c) {
+      if ('0' <= c && c <= '9') {
+        return c.charCodeAt(0) - '0'.charCodeAt(0);
+      }
+      throw 'illegal char :' + c;
+    };
+
+    return _this;
+  };
+
+  //---------------------------------------------------------------------
+  // qrAlphaNum
+  //---------------------------------------------------------------------
+
+  var qrAlphaNum = function(data) {
+
+    var _mode = QRMode.MODE_ALPHA_NUM;
+    var _data = data;
+
+    var _this = {};
+
+    _this.getMode = function() {
+      return _mode;
+    };
+
+    _this.getLength = function(buffer) {
+      return _data.length;
+    };
+
+    _this.write = function(buffer) {
+
+      var s = _data;
+
+      var i = 0;
+
+      while (i + 1 < s.length) {
+        buffer.put(
+          getCode(s.charAt(i) ) * 45 +
+          getCode(s.charAt(i + 1) ), 11);
+        i += 2;
+      }
+
+      if (i < s.length) {
+        buffer.put(getCode(s.charAt(i) ), 6);
+      }
+    };
+
+    var getCode = function(c) {
+
+      if ('0' <= c && c <= '9') {
+        return c.charCodeAt(0) - '0'.charCodeAt(0);
+      } else if ('A' <= c && c <= 'Z') {
+        return c.charCodeAt(0) - 'A'.charCodeAt(0) + 10;
+      } else {
+        switch (c) {
+        case ' ' : return 36;
+        case '$' : return 37;
+        case '%' : return 38;
+        case '*' : return 39;
+        case '+' : return 40;
+        case '-' : return 41;
+        case '.' : return 42;
+        case '/' : return 43;
+        case ':' : return 44;
+        default :
+          throw 'illegal char :' + c;
+        }
+      }
+    };
+
+    return _this;
+  };
+
+  //---------------------------------------------------------------------
+  // qr8BitByte
+  //---------------------------------------------------------------------
+
+  var qr8BitByte = function(data) {
+
+    var _mode = QRMode.MODE_8BIT_BYTE;
+    var _data = data;
+    var _bytes = qrcode.stringToBytes(data);
+
+    var _this = {};
+
+    _this.getMode = function() {
+      return _mode;
+    };
+
+    _this.getLength = function(buffer) {
+      return _bytes.length;
+    };
+
+    _this.write = function(buffer) {
+      for (var i = 0; i < _bytes.length; i += 1) {
+        buffer.put(_bytes[i], 8);
+      }
+    };
+
+    return _this;
+  };
+
+  //---------------------------------------------------------------------
+  // qrKanji
+  //---------------------------------------------------------------------
+
+  var qrKanji = function(data) {
+
+    var _mode = QRMode.MODE_KANJI;
+    var _data = data;
+
+    var stringToBytes = qrcode.stringToBytesFuncs['SJIS'];
+    if (!stringToBytes) {
+      throw 'sjis not supported.';
+    }
+    !function(c, code) {
+      // self test for sjis support.
+      var test = stringToBytes(c);
+      if (test.length != 2 || ( (test[0] << 8) | test[1]) != code) {
+        throw 'sjis not supported.';
+      }
+    }('\u53cb', 0x9746);
+
+    var _bytes = stringToBytes(data);
+
+    var _this = {};
+
+    _this.getMode = function() {
+      return _mode;
+    };
+
+    _this.getLength = function(buffer) {
+      return ~~(_bytes.length / 2);
+    };
+
+    _this.write = function(buffer) {
+
+      var data = _bytes;
+
+      var i = 0;
+
+      while (i + 1 < data.length) {
+
+        var c = ( (0xff & data[i]) << 8) | (0xff & data[i + 1]);
+
+        if (0x8140 <= c && c <= 0x9FFC) {
+          c -= 0x8140;
+        } else if (0xE040 <= c && c <= 0xEBBF) {
+          c -= 0xC140;
+        } else {
+          throw 'illegal char at ' + (i + 1) + '/' + c;
+        }
+
+        c = ( (c >>> 8) & 0xff) * 0xC0 + (c & 0xff);
+
+        buffer.put(c, 13);
+
+        i += 2;
+      }
+
+      if (i < data.length) {
+        throw 'illegal char at ' + (i + 1);
+      }
+    };
+
+    return _this;
+  };
+
+  //=====================================================================
+  // GIF Support etc.
+  //
+
+  //---------------------------------------------------------------------
+  // byteArrayOutputStream
+  //---------------------------------------------------------------------
+
+  var byteArrayOutputStream = function() {
+
+    var _bytes = [];
+
+    var _this = {};
+
+    _this.writeByte = function(b) {
+      _bytes.push(b & 0xff);
+    };
+
+    _this.writeShort = function(i) {
+      _this.writeByte(i);
+      _this.writeByte(i >>> 8);
+    };
+
+    _this.writeBytes = function(b, off, len) {
+      off = off || 0;
+      len = len || b.length;
+      for (var i = 0; i < len; i += 1) {
+        _this.writeByte(b[i + off]);
+      }
+    };
+
+    _this.writeString = function(s) {
+      for (var i = 0; i < s.length; i += 1) {
+        _this.writeByte(s.charCodeAt(i) );
+      }
+    };
+
+    _this.toByteArray = function() {
+      return _bytes;
+    };
+
+    _this.toString = function() {
+      var s = '';
+      s += '[';
+      for (var i = 0; i < _bytes.length; i += 1) {
+        if (i > 0) {
+          s += ',';
+        }
+        s += _bytes[i];
+      }
+      s += ']';
+      return s;
+    };
+
+    return _this;
+  };
+
+  //---------------------------------------------------------------------
+  // base64EncodeOutputStream
+  //---------------------------------------------------------------------
+
+  var base64EncodeOutputStream = function() {
+
+    var _buffer = 0;
+    var _buflen = 0;
+    var _length = 0;
+    var _base64 = '';
+
+    var _this = {};
+
+    var writeEncoded = function(b) {
+      _base64 += String.fromCharCode(encode(b & 0x3f) );
+    };
+
+    var encode = function(n) {
+      if (n < 0) {
+        // error.
+      } else if (n < 26) {
+        return 0x41 + n;
+      } else if (n < 52) {
+        return 0x61 + (n - 26);
+      } else if (n < 62) {
+        return 0x30 + (n - 52);
+      } else if (n == 62) {
+        return 0x2b;
+      } else if (n == 63) {
+        return 0x2f;
+      }
+      throw 'n:' + n;
+    };
+
+    _this.writeByte = function(n) {
+
+      _buffer = (_buffer << 8) | (n & 0xff);
+      _buflen += 8;
+      _length += 1;
+
+      while (_buflen >= 6) {
+        writeEncoded(_buffer >>> (_buflen - 6) );
+        _buflen -= 6;
+      }
+    };
+
+    _this.flush = function() {
+
+      if (_buflen > 0) {
+        writeEncoded(_buffer << (6 - _buflen) );
+        _buffer = 0;
+        _buflen = 0;
+      }
+
+      if (_length % 3 != 0) {
+        // padding
+        var padlen = 3 - _length % 3;
+        for (var i = 0; i < padlen; i += 1) {
+          _base64 += '=';
+        }
+      }
+    };
+
+    _this.toString = function() {
+      return _base64;
+    };
+
+    return _this;
+  };
+
+  //---------------------------------------------------------------------
+  // base64DecodeInputStream
+  //---------------------------------------------------------------------
+
+  var base64DecodeInputStream = function(str) {
+
+    var _str = str;
+    var _pos = 0;
+    var _buffer = 0;
+    var _buflen = 0;
+
+    var _this = {};
+
+    _this.read = function() {
+
+      while (_buflen < 8) {
+
+        if (_pos >= _str.length) {
+          if (_buflen == 0) {
+            return -1;
+          }
+          throw 'unexpected end of file./' + _buflen;
+        }
+
+        var c = _str.charAt(_pos);
+        _pos += 1;
+
+        if (c == '=') {
+          _buflen = 0;
+          return -1;
+        } else if (c.match(/^\s$/) ) {
+          // ignore if whitespace.
+          continue;
+        }
+
+        _buffer = (_buffer << 6) | decode(c.charCodeAt(0) );
+        _buflen += 6;
+      }
+
+      var n = (_buffer >>> (_buflen - 8) ) & 0xff;
+      _buflen -= 8;
+      return n;
+    };
+
+    var decode = function(c) {
+      if (0x41 <= c && c <= 0x5a) {
+        return c - 0x41;
+      } else if (0x61 <= c && c <= 0x7a) {
+        return c - 0x61 + 26;
+      } else if (0x30 <= c && c <= 0x39) {
+        return c - 0x30 + 52;
+      } else if (c == 0x2b) {
+        return 62;
+      } else if (c == 0x2f) {
+        return 63;
+      } else {
+        throw 'c:' + c;
+      }
+    };
+
+    return _this;
+  };
+
+  //---------------------------------------------------------------------
+  // gifImage (B/W)
+  //---------------------------------------------------------------------
+
+  var gifImage = function(width, height) {
+
+    var _width = width;
+    var _height = height;
+    var _data = new Array(width * height);
+
+    var _this = {};
+
+    _this.setPixel = function(x, y, pixel) {
+      _data[y * _width + x] = pixel;
+    };
+
+    _this.write = function(out) {
+
+      //---------------------------------
+      // GIF Signature
+
+      out.writeString('GIF87a');
+
+      //---------------------------------
+      // Screen Descriptor
+
+      out.writeShort(_width);
+      out.writeShort(_height);
+
+      out.writeByte(0x80); // 2bit
+      out.writeByte(0);
+      out.writeByte(0);
+
+      //---------------------------------
+      // Global Color Map
+
+      // black
+      out.writeByte(0x00);
+      out.writeByte(0x00);
+      out.writeByte(0x00);
+
+      // white
+      out.writeByte(0xff);
+      out.writeByte(0xff);
+      out.writeByte(0xff);
+
+      //---------------------------------
+      // Image Descriptor
+
+      out.writeString(',');
+      out.writeShort(0);
+      out.writeShort(0);
+      out.writeShort(_width);
+      out.writeShort(_height);
+      out.writeByte(0);
+
+      //---------------------------------
+      // Local Color Map
+
+      //---------------------------------
+      // Raster Data
+
+      var lzwMinCodeSize = 2;
+      var raster = getLZWRaster(lzwMinCodeSize);
+
+      out.writeByte(lzwMinCodeSize);
+
+      var offset = 0;
+
+      while (raster.length - offset > 255) {
+        out.writeByte(255);
+        out.writeBytes(raster, offset, 255);
+        offset += 255;
+      }
+
+      out.writeByte(raster.length - offset);
+      out.writeBytes(raster, offset, raster.length - offset);
+      out.writeByte(0x00);
+
+      //---------------------------------
+      // GIF Terminator
+      out.writeString(';');
+    };
+
+    var bitOutputStream = function(out) {
+
+      var _out = out;
+      var _bitLength = 0;
+      var _bitBuffer = 0;
+
+      var _this = {};
+
+      _this.write = function(data, length) {
+
+        if ( (data >>> length) != 0) {
+          throw 'length over';
+        }
+
+        while (_bitLength + length >= 8) {
+          _out.writeByte(0xff & ( (data << _bitLength) | _bitBuffer) );
+          length -= (8 - _bitLength);
+          data >>>= (8 - _bitLength);
+          _bitBuffer = 0;
+          _bitLength = 0;
+        }
+
+        _bitBuffer = (data << _bitLength) | _bitBuffer;
+        _bitLength = _bitLength + length;
+      };
+
+      _this.flush = function() {
+        if (_bitLength > 0) {
+          _out.writeByte(_bitBuffer);
+        }
+      };
+
+      return _this;
+    };
+
+    var getLZWRaster = function(lzwMinCodeSize) {
+
+      var clearCode = 1 << lzwMinCodeSize;
+      var endCode = (1 << lzwMinCodeSize) + 1;
+      var bitLength = lzwMinCodeSize + 1;
+
+      // Setup LZWTable
+      var table = lzwTable();
+
+      for (var i = 0; i < clearCode; i += 1) {
+        table.add(String.fromCharCode(i) );
+      }
+      table.add(String.fromCharCode(clearCode) );
+      table.add(String.fromCharCode(endCode) );
+
+      var byteOut = byteArrayOutputStream();
+      var bitOut = bitOutputStream(byteOut);
+
+      // clear code
+      bitOut.write(clearCode, bitLength);
+
+      var dataIndex = 0;
+
+      var s = String.fromCharCode(_data[dataIndex]);
+      dataIndex += 1;
+
+      while (dataIndex < _data.length) {
+
+        var c = String.fromCharCode(_data[dataIndex]);
+        dataIndex += 1;
+
+        if (table.contains(s + c) ) {
+
+          s = s + c;
+
+        } else {
+
+          bitOut.write(table.indexOf(s), bitLength);
+
+          if (table.size() < 0xfff) {
+
+            if (table.size() == (1 << bitLength) ) {
+              bitLength += 1;
+            }
+
+            table.add(s + c);
+          }
+
+          s = c;
+        }
+      }
+
+      bitOut.write(table.indexOf(s), bitLength);
+
+      // end code
+      bitOut.write(endCode, bitLength);
+
+      bitOut.flush();
+
+      return byteOut.toByteArray();
+    };
+
+    var lzwTable = function() {
+
+      var _map = {};
+      var _size = 0;
+
+      var _this = {};
+
+      _this.add = function(key) {
+        if (_this.contains(key) ) {
+          throw 'dup key:' + key;
+        }
+        _map[key] = _size;
+        _size += 1;
+      };
+
+      _this.size = function() {
+        return _size;
+      };
+
+      _this.indexOf = function(key) {
+        return _map[key];
+      };
+
+      _this.contains = function(key) {
+        return typeof _map[key] != 'undefined';
+      };
+
+      return _this;
+    };
+
+    return _this;
+  };
+
+  var createDataURL = function(width, height, getPixel) {
+    var gif = gifImage(width, height);
+    for (var y = 0; y < height; y += 1) {
+      for (var x = 0; x < width; x += 1) {
+        gif.setPixel(x, y, getPixel(x, y) );
+      }
+    }
+
+    var b = byteArrayOutputStream();
+    gif.write(b);
+
+    var base64 = base64EncodeOutputStream();
+    var bytes = b.toByteArray();
+    for (var i = 0; i < bytes.length; i += 1) {
+      base64.writeByte(bytes[i]);
+    }
+    base64.flush();
+
+    return 'data:image/gif;base64,' + base64;
+  };
+
+  //---------------------------------------------------------------------
+  // returns qrcode function.
+
+  return qrcode;
+}();
+
+// multibyte support
+!function() {
+
+  qrcode.stringToBytesFuncs['UTF-8'] = function(s) {
+    // http://stackoverflow.com/questions/18729405/how-to-convert-utf8-string-to-byte-array
+    function toUTF8Array(str) {
+      var utf8 = [];
+      for (var i=0; i < str.length; i++) {
+        var charcode = str.charCodeAt(i);
+        if (charcode < 0x80) utf8.push(charcode);
+        else if (charcode < 0x800) {
+          utf8.push(0xc0 | (charcode >> 6),
+              0x80 | (charcode & 0x3f));
+        }
+        else if (charcode < 0xd800 || charcode >= 0xe000) {
+          utf8.push(0xe0 | (charcode >> 12),
+              0x80 | ((charcode>>6) & 0x3f),
+              0x80 | (charcode & 0x3f));
+        }
+        // surrogate pair
+        else {
+          i++;
+          // UTF-16 encodes 0x10000-0x10FFFF by
+          // subtracting 0x10000 and splitting the
+          // 20 bits of 0x0-0xFFFFF into two halves
+          charcode = 0x10000 + (((charcode & 0x3ff)<<10)
+            | (str.charCodeAt(i) & 0x3ff));
+          utf8.push(0xf0 | (charcode >>18),
+              0x80 | ((charcode>>12) & 0x3f),
+              0x80 | ((charcode>>6) & 0x3f),
+              0x80 | (charcode & 0x3f));
+        }
+      }
+      return utf8;
+    }
+    return toUTF8Array(s);
+  };
+
+}();
+
+(function (factory) {
+  if (typeof define === 'function' && define.amd) {
+      define([], factory);
+  } else if (typeof exports === 'object') {
+      module.exports = factory();
+  }
+}(function () {
+    return qrcode;
+}));