save

src/utils/index.ts

@@ -1,3 +1,42 @@
 export function getRandom(a: number, b: number): number {
-    return Math.random() * (b - a) + a;
+  return Math.random() * (b - a) + a;
 }
+
+export function sizeofByte(str, charset = 'utf-16') {
+  let total = 0
+  let charCode
+
+  charset = charset.toLowerCase()
+
+  if (charset === 'utf-8' || charset === 'utf8') {
+    for (let i = 0, len = str.length; i < len; i++) {
+      charCode = str.codePointAt(i)
+
+      if (charCode <= 0x007f) {
+        total += 1
+      } else if (charCode <= 0x07ff) {
+        total += 2
+      } else if (charCode <= 0xffff) {
+        total += 3
+      } else {
+        total += 4
+        i++
+      }
+    }
+  } else if (charset === 'utf-16' || charset === 'utf16') {
+    for (let i = 0, len = str.length; i < len; i++) {
+      charCode = str.codePointAt(i)
+
+      if (charCode <= 0xffff) {
+        total += 2
+      } else {
+        total += 4
+        i++
+      }
+    }
+  } else {
+    total = str.replace(/[^\x00-\xff]/g, 'aa').length
+  }
+
+  return total
+}