forked from mirrors/gecko-dev
128 lines
3.7 KiB
C++
128 lines
3.7 KiB
C++
/* 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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#include "nsICharsetConverterManager.h"
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#include "nsServiceManagerUtils.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,
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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 TypeError.
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if (!EncodingUtils::FindEncodingForLabel(label, mEncoding)) {
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aRv.ThrowTypeError(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.ThrowTypeError(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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nsCOMPtr<nsICharsetConverterManager> ccm =
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do_GetService(NS_CHARSETCONVERTERMANAGER_CONTRACTID);
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if (!ccm) {
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aRv.Throw(NS_ERROR_UNEXPECTED);
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return;
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}
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ccm->GetUnicodeEncoderRaw(mEncoding.get(), getter_AddRefs(mEncoder));
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if (!mEncoder) {
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aRv.Throw(NS_ERROR_UNEXPECTED);
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return;
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}
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}
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JSObject*
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TextEncoder::Encode(JSContext* aCx,
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const nsAString& aString,
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const TextEncodeOptions& aOptions,
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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 PRUnichar* data = PromiseFlatString(aString).get();
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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 nullptr;
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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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static const fallible_t fallible = fallible_t();
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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 nullptr;
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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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// If the internal streaming flag is not set, then reset
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// the encoding algorithm state to the default values for encoding.
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if (!aOptions.stream) {
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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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}
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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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outView = Uint8Array::Create(aCx, this, dstLen,
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reinterpret_cast<uint8_t*>(buf.get()));
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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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return 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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// Our utf-16 converter does not comply with the Encoding Standard.
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// As a result the utf-16le converter is used for the encoding label
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// "utf-16".
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// This workaround should not be exposed to the public API and so "utf-16"
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// is returned by GetEncoding() if the internal encoding name is "utf-16le".
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if (mEncoding.EqualsLiteral("UTF-16LE")) {
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aEncoding.AssignLiteral("utf-16");
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return;
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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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NS_IMPL_CYCLE_COLLECTING_ADDREF(TextEncoder)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(TextEncoder)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TextEncoder)
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_1(TextEncoder, mGlobal)
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} // dom
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} // mozilla
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