dom/encoding/TextEncoder.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/TextEncoder.h"
   8 #include "mozilla/CheckedInt.h"
   9 #include "mozilla/ErrorResult.h"
  10 #include "mozilla/UniquePtrExtensions.h"
  11 #include "nsReadableUtils.h"
  12
  13 namespace mozilla::dom {
  14
  15 void TextEncoder::Encode(JSContext* aCx, JS::Handle<JSObject*> aObj,
  16                          const nsACString& aUtf8String,
  17                          JS::MutableHandle<JSObject*> aRetval,
  18                          OOMReporter& aRv) {
  19   JSAutoRealm ar(aCx, aObj);
  20   JSObject* outView = Uint8Array::Create(aCx, aUtf8String);
  21   if (!outView) {
  22     aRv.ReportOOM();
  23     return;
  24   }
  25
  26   aRetval.set(outView);
  27 }
  28
  29 void TextEncoder::EncodeInto(JSContext* aCx, JS::Handle<JSString*> aSrc,
  30                              const Uint8Array& aDst,
  31                              TextEncoderEncodeIntoResult& aResult,
  32                              OOMReporter& aError) {
  33   aDst.ComputeState();
  34   size_t read;
  35   size_t written;
  36   auto maybe = JS_EncodeStringToUTF8BufferPartial(
  37       aCx, aSrc, AsWritableChars(Span(aDst.Data(), aDst.Length())));
  38   if (!maybe) {
  39     aError.ReportOOM();
  40     return;
  41   }
  42   Tie(read, written) = *maybe;
  43   MOZ_ASSERT(written <= aDst.Length());
  44   aResult.mRead.Construct() = read;
  45   aResult.mWritten.Construct() = written;
  46 }
  47
  48 void TextEncoder::GetEncoding(nsACString& aEncoding) {
  49   aEncoding.AssignLiteral("utf-8");
  50 }
  51
  52 }  // namespace mozilla::dom