100 lines
2.9 KiB
C++
100 lines
2.9 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/dom/EncodingUtils.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(const nsAString& aEncoding, ErrorResult& aRv)
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{
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nsAutoString label(aEncoding);
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EncodingUtils::TrimSpaceCharacters(label);
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// Let encoding be the result of getting an encoding from label.
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// If encoding is failure, or is none of utf-8, utf-16, and utf-16be,
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// throw a RangeError (https://encoding.spec.whatwg.org/#dom-textencoder).
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if (!EncodingUtils::FindEncodingForLabel(label, mEncoding)) {
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aRv.ThrowRangeError<MSG_ENCODING_NOT_SUPPORTED>(label);
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return;
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}
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if (!mEncoding.EqualsLiteral("UTF-8") &&
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!mEncoding.EqualsLiteral("UTF-16LE") &&
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!mEncoding.EqualsLiteral("UTF-16BE")) {
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aRv.ThrowRangeError<MSG_DOM_ENCODING_NOT_UTF>();
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return;
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}
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// Create an encoder object for mEncoding.
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mEncoder = EncodingUtils::EncoderForEncoding(mEncoding);
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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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nsAutoArrayPtr<char> buf(new (fallible) 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, &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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CopyASCIItoUTF16(mEncoding, aEncoding);
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nsContentUtils::ASCIIToLower(aEncoding);
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}
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} // namespace dom
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} // namespace mozilla
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