mirror of
https://github.com/HeyPuter/firefox.git
synced 2026-11-13 20:14:57 -10:00
Emilio Cobos Álvarez
2a9f5a0f4b
UTF8String has small-size optimization already, and does what we were doing taking less memory when the string is latin1, so it should be a clear improvement unless I'm missing something. I didn't remove it from encodeInto because it'd do more work in the case where the UInt8Array doesn't have enough capacity... Not sure if that case is worth optimizing or not, honestly. Differential Revision: https://phabricator.services.mozilla.com/D58713
61 lines
1.9 KiB
C++
61 lines
1.9 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::Encode(JSContext* aCx, JS::Handle<JSObject*> aObj,
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const nsACString& aUtf8String,
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JS::MutableHandle<JSObject*> aRetval,
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OOMReporter& aRv) {
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// Uint8Array::Create takes uint32_t as the length.
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if (MOZ_UNLIKELY(aUtf8String.Length() > UINT32_MAX)) {
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aRv.ReportOOM();
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return;
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}
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JSAutoRealm ar(aCx, aObj);
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const char* buffer = aUtf8String.BeginReading();
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JSObject* outView = Uint8Array::Create(aCx, aUtf8String.Length(), reinterpret_cast<const uint8_t*>(buffer));
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if (!outView) {
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aRv.ReportOOM();
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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(JSContext* aCx, JS::Handle<JSString*> aSrc,
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const Uint8Array& aDst,
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TextEncoderEncodeIntoResult& aResult,
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OOMReporter& aError) {
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aDst.ComputeLengthAndData();
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size_t read;
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size_t written;
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auto maybe = JS_EncodeStringToUTF8BufferPartial(
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aCx, aSrc, AsWritableChars(MakeSpan(aDst.Data(), aDst.Length())));
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if (!maybe) {
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aError.ReportOOM();
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return;
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}
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Tie(read, written) = *maybe;
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MOZ_ASSERT(written <= 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(nsACString& 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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