81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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/dom/EncodingUtils.h"
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#include "mozilla/UniquePtrExtensions.h"
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#include "nsContentUtils.h"
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namespace mozilla {
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namespace dom {
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void
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TextEncoder::Init()
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{
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// Create an encoder object for utf-8.
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mEncoder = EncodingUtils::EncoderForEncoding(NS_LITERAL_CSTRING("UTF-8"));
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}
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void
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TextEncoder::Encode(JSContext* aCx,
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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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{
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// Run the steps of the encoding algorithm.
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int32_t srcLen = aString.Length();
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int32_t maxLen;
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const char16_t* data = aString.BeginReading();
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nsresult rv = mEncoder->GetMaxLength(data, srcLen, &maxLen);
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if (NS_FAILED(rv)) {
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aRv.Throw(rv);
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return;
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}
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// Need a fallible allocator because the caller may be a content
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// and the content can specify the length of the string.
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auto buf = MakeUniqueFallible<char[]>(maxLen + 1);
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if (!buf) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return;
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}
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int32_t dstLen = maxLen;
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rv = mEncoder->Convert(data, &srcLen, buf.get(), &dstLen);
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// Now reset the encoding algorithm state to the default values for encoding.
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int32_t finishLen = maxLen - dstLen;
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rv = mEncoder->Finish(&buf[dstLen], &finishLen);
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if (NS_SUCCEEDED(rv)) {
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dstLen += finishLen;
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}
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JSObject* outView = nullptr;
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if (NS_SUCCEEDED(rv)) {
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buf[dstLen] = '\0';
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JSAutoCompartment ac(aCx, aObj);
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outView = Uint8Array::Create(aCx, dstLen,
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reinterpret_cast<uint8_t*>(buf.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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}
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if (NS_FAILED(rv)) {
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aRv.Throw(rv);
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}
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aRetval.set(outView);
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}
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void
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TextEncoder::GetEncoding(nsAString& aEncoding)
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{
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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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