Twiddle with VLQ

Author: szuend

src/vlq.test.ts

@@ -8,6 +8,13 @@ import { assertFalse, assertStrictEquals } from "jsr:@std/assert";
 
 describe("TokenIterator", () => {
   describe("nextUnsignedVLQ", () => {
+    it("handles multi-digit numbers", () => {
+      const iter = new TokenIterator("hB");
+
+      assertStrictEquals(iter.nextUnsignedVLQ(), 33);
+      assertFalse(iter.hasNext());
+    });
+
     it("returns zero when no more characters are available", () => {
       const iter = new TokenIterator("");
       assertFalse(iter.hasNext());

src/vlq.ts

@@ -83,13 +83,13 @@ export class TokenIterator {
   nextUnsignedVLQ(): number {
     let result = 0;
     let shift = 0;
-    let digit: number = VLQ_CONTINUATION_MASK;
-    while (digit & VLQ_CONTINUATION_MASK) {
+    let digit = 0;
+    do {
       const charCode = this.nextCharCode();
       digit = BASE64_CODES[charCode];
       result += (digit & VLQ_BASE_MASK) << shift;
       shift += VLQ_BASE_SHIFT;
-    }
+    } while (digit & VLQ_CONTINUATION_MASK);
     return result;
   }