1 files changed, 46 insertions, 0 deletions
diff --git a/src/utils.js b/src/utils.js
index 3176400..ba5d905 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -55,10 +55,56 @@ function downloadStringAsFile(filename, text) {
     URL.revokeObjectURL(link.href);
 }
 
+function ydkeEncode(d) {
+    let deck = [];
+    for (let card of d) {
+        let num = parseInt(card);
+        if (isNaN(num)) continue;
+        deck.push(num);
+    }
+    const buffer = new ArrayBuffer(deck.length * 4);
+    const view = new DataView(buffer);
+    for (let i = 0; i < deck.length; i++) {
+        // Little-endian
+        view.setUint32(i * 4, deck[i], true);
+    }
+    return btoa(String.fromCharCode(...new Uint8Array(buffer)));
+}
+
+function ydkeDecode(encodedDeck) {
+    const binaryString = atob(encodedDeck);
+    const buffer = new ArrayBuffer(binaryString.length);
+    const view = new DataView(buffer);
+    for (let i = 0; i < binaryString.length; i++) {
+        view.setUint8(i, binaryString.charCodeAt(i));
+    }
+    const deck = [];
+    for (let i = 0; i < buffer.byteLength; i += 4) {
+        deck.push(String(view.getUint32(i, true))); // Little-endian
+    }
+    return deck;
+}
+
+function parseYdke(ydkeString) {
+    const [mainEncoded, extraEncoded, sideEncoded] = ydkeString.split('!');
+    const main = ydkeDecode(mainEncoded);
+    const extra = ydkeDecode(extraEncoded);
+    const side = ydkeDecode(sideEncoded);
+    return { main, extra, side };
+}
+
+function genYdke(deck) {
+    const mainEncoded = ydkeEncode(deck.main);
+    const extraEncoded = ydkeEncode(deck.extra);
+    const sideEncoded = ydkeEncode(deck.side);
+    return `${mainEncoded}!${extraEncoded}!${sideEncoded}`;
+}
 
 export {
     parseYdk,
     genYdk,
+    parseYdke,
+    genYdke,
     downloadStringAsFile,
 };