forked from mirrors/gecko-dev
69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/TextEncoder.h"
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#include "mozilla/CheckedInt.h"
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#include "mozilla/UniquePtrExtensions.h"
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#include "nsReadableUtils.h"
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namespace mozilla {
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namespace dom {
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void TextEncoder::Init() {}
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void TextEncoder::Encode(JSContext* aCx, JS::Handle<JSObject*> aObj,
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const nsAString& aString,
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JS::MutableHandle<JSObject*> aRetval,
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ErrorResult& aRv) {
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// Given nsTSubstring<char16_t>::kMaxCapacity, it should be
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// impossible for the length computation to overflow, but
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// let's use checked math in case someone changes something
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// in the future.
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// Uint8Array::Create takes uint32_t as the length.
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CheckedInt<uint32_t> bufLen(aString.Length());
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bufLen *= 3; // from the contract for ConvertUTF16toUTF8
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if (!bufLen.isValid()) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return;
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}
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auto data = mozilla::MakeUniqueFallible<uint8_t[]>(bufLen.value());
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if (!data) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return;
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}
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size_t utf8Len = ConvertUTF16toUTF8(
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aString, MakeSpan(reinterpret_cast<char*>(data.get()), bufLen.value()));
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MOZ_ASSERT(utf8Len <= bufLen.value());
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JSAutoRealm ar(aCx, aObj);
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JSObject* outView = Uint8Array::Create(aCx, utf8Len, data.get());
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if (!outView) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return;
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}
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aRetval.set(outView);
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}
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void TextEncoder::EncodeInto(const nsAString& aSrc, const Uint8Array& aDst,
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TextEncoderEncodeIntoResult& aResult) {
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aDst.ComputeLengthAndData();
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size_t read;
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size_t written;
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Tie(read, written) = ConvertUTF16toUTF8Partial(
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aSrc, MakeSpan(reinterpret_cast<char*>(aDst.Data()), aDst.Length()));
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aResult.mRead.Construct() = read;
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aResult.mWritten.Construct() = written;
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}
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void TextEncoder::GetEncoding(nsAString& aEncoding) {
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aEncoding.AssignLiteral("utf-8");
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}
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} // namespace dom
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} // namespace mozilla
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