Make Tap#length a getter

lib/utils.js

@@ -534,12 +534,15 @@ class Tap {
     }
     this.arr = buf;
     this.pos = pos | 0;
-    this.length = buf.length;
     if (this.pos < 0) {
       throw new Error('negative offset');
     }
   }
 
+  get length() {
+    return this.arr.length;
+  }
+
   reinitialize (capacity) {
     this.setData(new Uint8Array(capacity));
   }
@@ -584,9 +587,9 @@ class Tap {
    * caller to always check that the read, skip, or write was valid by calling
    * this method.
    */
-  isValid () { return this.pos <= this.length; }
+  isValid () { return this.pos <= this.arr.length; }
 
-  _invalidate () { this.pos = this.length + 1; }
+  _invalidate () { this.pos = this.arr.length + 1; }
 
   // Read, skip, write methods.
   //
@@ -660,7 +663,7 @@ class Tap {
   readFloat () {
     let pos = this.pos;
     this.pos += 4;
-    if (this.pos > this.length) {
+    if (this.pos > this.arr.length) {
       return 0;
     }
     FLOAT_VIEW.setUint32(
@@ -678,7 +681,7 @@ class Tap {
   writeFloat (f) {
     let pos = this.pos;
     this.pos += 4;
-    if (this.pos > this.length) {
+    if (this.pos > this.arr.length) {
       return;
     }
 
@@ -693,7 +696,7 @@ class Tap {
   readDouble () {
     let pos = this.pos;
     this.pos += 8;
-    if (this.pos > this.length) {
+    if (this.pos > this.arr.length) {
       return 0;
     }
     FLOAT_VIEW.setUint32(
@@ -720,7 +723,7 @@ class Tap {
   writeDouble (d) {
     let pos = this.pos;
     this.pos += 8;
-    if (this.pos > this.length) {
+    if (this.pos > this.arr.length) {
       return;
     }
     FLOAT_VIEW.setFloat64(0, d, true);
@@ -739,7 +742,7 @@ class Tap {
   readFixed (len) {
     let pos = this.pos;
     this.pos += len;
-    if (this.pos > this.length) {
+    if (this.pos > this.arr.length) {
       return;
     }
     return this.arr.slice(pos, pos + len);
@@ -751,7 +754,7 @@ class Tap {
     len = len || buf.length;
     let pos = this.pos;
     this.pos += len;
-    if (this.pos > this.length) {
+    if (this.pos > this.arr.length) {
       return;
     }
     this.arr.set(buf.subarray(0, len), pos);
@@ -798,7 +801,7 @@ class Tap {
     }
     let pos = this.pos;
     this.pos += len;
-    if (this.pos > this.length) {
+    if (this.pos > this.arr.length) {
       return;
     }