1 files changed, 19 insertions, 0 deletions
diff --git a/resources/jquery/jquery.byteLength.js b/resources/jquery/jquery.byteLength.js
new file mode 100644
index 00000000..20fa5c8e
--- /dev/null
+++ b/resources/jquery/jquery.byteLength.js
@@ -0,0 +1,19 @@
+/**
+ * jQuery.byteLength
+ *
+ * Calculate the byte length of a string (accounting for UTF-8).
+ *
+ * @author Jan Paul Posma
+ */
+jQuery.byteLength = function( str ) {
+
+	// This basically figures out how many bytes a UTF-16 string (which is what js sees)
+	// will take in UTF-8 by replacing a 2 byte character with 2 *'s, etc, and counting that.
+	// Note, surrogate (\uD800-\uDFFF) characters are counted as 2 bytes, since there's two of them
+	// and the actual character takes 4 bytes in UTF-8 (2*2=4). Might not work perfectly in
+	// edge cases such as illegal sequences, but that should never happen.
+	return str
+		.replace( /[\u0080-\u07FF\uD800-\uDFFF]/g, '**' )
+		.replace( /[\u0800-\uD7FF\uE000-\uFFFF]/g, '***' )
+		.length;
+}