NapCatQQ source snapshot

packages/napcat-qrcode/vendor/QRCode/QRBitBuffer.ts

@@ -0,0 +1,39 @@
+class QRBitBuffer {
+  buffer: number[];
+  length: number;
+
+  constructor () {
+    this.buffer = [];
+    this.length = 0;
+  }
+
+  get (index: number): boolean {
+    const bufIndex = Math.floor(index / 8);
+    return ((this.buffer[bufIndex]! >>> (7 - index % 8)) & 1) === 1;
+  }
+
+  put (num: number, length: number): void {
+    for (let i = 0; i < length; i++) {
+      this.putBit(((num >>> (length - i - 1)) & 1) === 1);
+    }
+  }
+
+  getLengthInBits (): number {
+    return this.length;
+  }
+
+  putBit (bit: boolean): void {
+    const bufIndex = Math.floor(this.length / 8);
+    if (this.buffer.length <= bufIndex) {
+      this.buffer.push(0);
+    }
+
+    if (bit) {
+      this.buffer[bufIndex]! |= (0x80 >>> (this.length % 8));
+    }
+
+    this.length++;
+  }
+}
+
+export default QRBitBuffer;