structurae - npm Package Compare versions

Comparing version 3.0.2 to 3.0.3

CHANGELOG.md

@@ -7,2 +7,6 @@ # Changelog
 
+## [3.0.3] - 2020-04-03
+### Added
+- MapView can be used within a larger buffer.
+
 ## [3.0.2] - 2020-04-02
@@ -9,0 +13,0 @@ ### Added

lib/map-view.js

@@ -39,9 +39,9 @@ const { ObjectView, ObjectViewMixin } = require('./object-view');
   getLayout(field) {
-    const { layout, fields } = this.constructor;
+    const { layout } = this.constructor;
     const definition = layout[field];
     if (!definition) throw TypeError(`Field "${field}" is not found.`);
     const { View, start } = definition;
-    const fieldStart = this.getUint32(start << 2, true);
-    const end = start < fields.length - 1 ? this.getUint32(start + 1 << 2, true)
-      : this.byteLength;
+    const startOffset = start << 2;
+    const fieldStart = this.getUint32(startOffset, true);
+    const end = this.getUint32(startOffset + 4, true);
     return [View, fieldStart, end];
@@ -105,8 +105,9 @@ }
       const start = offsets[i];
-      const end = i < fieldCount - 1 ? offsets[i + 1] : length;
+      const end = offsets[i + 1];
       if (start === end) continue;
       const field = fields[i];
       const { View } = layout[field];
-      View.from(value[field], view, view.byteOffset + start, end - start);
+      View.from(value[field], view, start, end - start);
     }
+    view.setUint32(fieldCount << 2, offsets[fieldCount], true);
     return view;
@@ -125,4 +126,4 @@ }
     const fieldCount = fields.length;
-    let length = fieldCount << 2;
-    const offsets = new Array(fieldCount).fill(0);
+    let length = (fieldCount + 1) << 2;
+    const offsets = new Array(fieldCount + 1).fill(0);
     for (let i = 0; i < fieldCount; i++) {
@@ -137,2 +138,3 @@ const field = fields[i];
     }
+    offsets[fieldCount] = length;
     return !getOffsets ? length : [length, offsets];
@@ -150,12 +152,11 @@ }
     const { layout, fields } = this;
-    const lastFieldId = fields.length - 1;
     const object = {};
-    for (let i = 0; i <= lastFieldId; i++) {
+    for (let i = 0; i < fields.length; i++) {
       const field = fields[i];
       const { View } = layout[field];
-      const fieldStart = view.getUint32(i << 2, true);
-      const end = i < lastFieldId ? view.getUint32(i + 1 << 2, true)
-        : view.byteLength;
+      const startOffset = start + (i << 2);
+      const fieldStart = view.getUint32(startOffset, true);
+      const end = view.getUint32(startOffset + 4, true);
       if (fieldStart === end) continue;
-      object[field] = View.toJSON(view, view.byteOffset + start + fieldStart, end - fieldStart);
+      object[field] = View.toJSON(view, start + fieldStart, end - fieldStart);
     }
@@ -162,0 +163,0 @@ return object;

package.json

 {
   "name": "structurae",
-  "version": "3.0.2",
+  "version": "3.0.3",
   "description": "Data structures for performance-sensitive modern JavaScript applications.",
@@ -5,0 +5,0 @@ "main": "index.js",

No alert changes

Improved metrics

Total package byte prevSize

215707

0.03%

Lines of code

5773

0.02%

No dependency changes