Merge pull request #234 from rsksmart/fix-VarInt

Fixes VarInt
rsksmart · Feb 26, 2025 · c74e593 · c74e593
2 parents 9f2a1dc + 0144744
commit c74e593
Showing 1 changed file with 7 additions and 7 deletions.
diff --git a/lib/varint.js b/lib/varint.js
@@ -1,10 +1,10 @@
 class VarInt {
-  constructor(value) {
+  constructor(value, offset = 0) {
     if (typeof value === 'number' || typeof value === 'bigint') {
       this.value = BigInt(value);
       this.originallyEncodedSize = this.getSizeInBytes();
     } else if (Buffer.isBuffer(value)) {
-      this.value = this.decode(value);
+      this.value = this.decode(value, offset);
       this.originallyEncodedSize = this.getSizeInBytes();
     } else {
       throw new Error('Invalid input: value should be a number or buffer');
@@ -49,16 +49,16 @@ class VarInt {
     }
   }
 
-  decode(buffer) {
-    const first = buffer[0];
+  decode(buffer, offset = 0) {
+    const first = buffer[offset];
     if (first < 253) {
       return BigInt(first);
     } else if (first === 253) {
-      return BigInt(buffer.readUInt16LE(1));
+      return BigInt(buffer.readUInt16LE(offset + 1));
     } else if (first === 254) {
-      return BigInt(buffer.readUInt32LE(1));
+      return BigInt(buffer.readUInt32LE(offset + 1));
     } else {
-      return buffer.readBigUInt64LE(1);
+      return buffer.readBigUInt64LE(offset + 1);
     }
   }
 }