summaryrefslogtreecommitdiffstats
path: root/dom/encoding/TextEncoder.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'dom/encoding/TextEncoder.cpp')
-rw-r--r--dom/encoding/TextEncoder.cpp81
1 files changed, 81 insertions, 0 deletions
diff --git a/dom/encoding/TextEncoder.cpp b/dom/encoding/TextEncoder.cpp
new file mode 100644
index 000000000..ccd298b38
--- /dev/null
+++ b/dom/encoding/TextEncoder.cpp
@@ -0,0 +1,81 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/TextEncoder.h"
+#include "mozilla/dom/EncodingUtils.h"
+#include "mozilla/UniquePtrExtensions.h"
+#include "nsContentUtils.h"
+
+namespace mozilla {
+namespace dom {
+
+void
+TextEncoder::Init()
+{
+ // Create an encoder object for utf-8.
+ mEncoder = EncodingUtils::EncoderForEncoding(NS_LITERAL_CSTRING("UTF-8"));
+}
+
+void
+TextEncoder::Encode(JSContext* aCx,
+ JS::Handle<JSObject*> aObj,
+ const nsAString& aString,
+ JS::MutableHandle<JSObject*> aRetval,
+ ErrorResult& aRv)
+{
+ // Run the steps of the encoding algorithm.
+ int32_t srcLen = aString.Length();
+ int32_t maxLen;
+ const char16_t* data = aString.BeginReading();
+ nsresult rv = mEncoder->GetMaxLength(data, srcLen, &maxLen);
+ if (NS_FAILED(rv)) {
+ aRv.Throw(rv);
+ return;
+ }
+ // Need a fallible allocator because the caller may be a content
+ // and the content can specify the length of the string.
+ auto buf = MakeUniqueFallible<char[]>(maxLen + 1);
+ if (!buf) {
+ aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+ return;
+ }
+
+ int32_t dstLen = maxLen;
+ rv = mEncoder->Convert(data, &srcLen, buf.get(), &dstLen);
+
+ // Now reset the encoding algorithm state to the default values for encoding.
+ int32_t finishLen = maxLen - dstLen;
+ rv = mEncoder->Finish(&buf[dstLen], &finishLen);
+ if (NS_SUCCEEDED(rv)) {
+ dstLen += finishLen;
+ }
+
+ JSObject* outView = nullptr;
+ if (NS_SUCCEEDED(rv)) {
+ buf[dstLen] = '\0';
+ JSAutoCompartment ac(aCx, aObj);
+ outView = Uint8Array::Create(aCx, dstLen,
+ reinterpret_cast<uint8_t*>(buf.get()));
+ if (!outView) {
+ aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+ return;
+ }
+ }
+
+ if (NS_FAILED(rv)) {
+ aRv.Throw(rv);
+ }
+ aRetval.set(outView);
+}
+
+void
+TextEncoder::GetEncoding(nsAString& aEncoding)
+{
+ aEncoding.AssignLiteral("utf-8");
+}
+
+} // namespace dom
+} // namespace mozilla