TextEncoder.cpp (1772B)
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 9 #include "mozilla/ErrorResult.h" 10 #include "nsReadableUtils.h" 11 12 namespace mozilla::dom { 13 14 void TextEncoder::Encode(JSContext* aCx, JS::Handle<JSObject*> aObj, 15 const nsACString& aUtf8String, 16 JS::MutableHandle<JSObject*> aRetval, 17 ErrorResult& aRv) { 18 JSAutoRealm ar(aCx, aObj); 19 JSObject* outView = Uint8Array::Create(aCx, aUtf8String, aRv); 20 if (aRv.Failed()) { 21 return; 22 } 23 24 aRetval.set(outView); 25 } 26 27 void TextEncoder::EncodeInto(JSContext* aCx, JS::Handle<JSString*> aSrc, 28 const Uint8Array& aDst, 29 TextEncoderEncodeIntoResult& aResult, 30 OOMReporter& aError) { 31 DebugOnly<size_t> dstLength = 0; 32 auto maybe = aDst.ProcessData( 33 [&](const Span<uint8_t>& aData, JS::AutoCheckCannotGC&&) { 34 dstLength = aData.Length(); 35 return JS_EncodeStringToUTF8BufferPartial(aCx, aSrc, 36 AsWritableChars(aData)); 37 }); 38 if (!maybe) { 39 aError.ReportOOM(); 40 return; 41 } 42 size_t read; 43 size_t written; 44 std::tie(read, written) = *maybe; 45 MOZ_ASSERT(written <= dstLength); 46 aResult.mRead.Construct() = read; 47 aResult.mWritten.Construct() = written; 48 } 49 50 void TextEncoder::GetEncoding(nsACString& aEncoding) { 51 aEncoding.AssignLiteral("utf-8"); 52 } 53 54 } // namespace mozilla::dom