AK+Everywhere: Make UTF-8 and UTF-32 to UTF-16 converters fallible

These could fail to allocate the underlying storage needed to store the
UTF-16 data. Propagate these errors.

2 files changed, 7 insertions, 3 deletions

diff --git a/Userland/Libraries/LibWeb/SVG/SVGTextContentElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGTextContentElement.cpp
index c5eb5e7155..11086090b7 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGTextContentElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGTextContentElement.cpp
@@ -5,6 +5,8 @@
  */
 
 #include <AK/Utf16View.h>
+#include <LibJS/Runtime/Completion.h>
+#include <LibJS/Runtime/Utf16String.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/SVG/SVGTextContentElement.h>
 
@@ -17,9 +19,10 @@ SVGTextContentElement::SVGTextContentElement(DOM::Document& document, DOM::Quali
 }
 
 // https://svgwg.org/svg2-draft/text.html#__svg__SVGTextContentElement__getNumberOfChars
-int SVGTextContentElement::get_number_of_chars() const
+WebIDL::ExceptionOr<int> SVGTextContentElement::get_number_of_chars() const
 {
-    return AK::utf8_to_utf16(child_text_content()).size();
+    auto chars = TRY_OR_THROW_OOM(vm(), utf8_to_utf16(child_text_content()));
+    return static_cast<int>(chars.size());
 }
 
 }
diff --git a/Userland/Libraries/LibWeb/SVG/SVGTextContentElement.h b/Userland/Libraries/LibWeb/SVG/SVGTextContentElement.h
index ed9f4fedbd..74ded56554 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGTextContentElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGTextContentElement.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <LibWeb/SVG/SVGGraphicsElement.h>
+#include <LibWeb/WebIDL/ExceptionOr.h>
 
 namespace Web::SVG {
 
@@ -15,7 +16,7 @@ class SVGTextContentElement : public SVGGraphicsElement {
     WEB_PLATFORM_OBJECT(SVGTextContentElement, SVGGraphicsElement);
 
 public:
-    int get_number_of_chars() const;
+    WebIDL::ExceptionOr<int> get_number_of_chars() const;
 
 protected:
     SVGTextContentElement(DOM::Document&, DOM::QualifiedName);