forked from mirrors/gecko-dev
132 lines
3.8 KiB
C++
132 lines
3.8 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/TextDecoder.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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static const PRUnichar kReplacementChar = static_cast<PRUnichar>(0xFFFD);
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void
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TextDecoder::Init(const nsAString& aEncoding,
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const TextDecoderOptions& aFatal,
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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, 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 the constructor is called with an options argument,
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// and the fatal property of the dictionary is set,
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// set the internal fatal flag of the decoder object.
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mFatal = aFatal.fatal;
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// Create a decoder 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->GetUnicodeDecoderRaw(mEncoding.get(), getter_AddRefs(mDecoder));
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if (!mDecoder) {
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aRv.Throw(NS_ERROR_UNEXPECTED);
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return;
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}
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if (mFatal) {
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mDecoder->SetInputErrorBehavior(nsIUnicodeDecoder::kOnError_Signal);
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}
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}
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void
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TextDecoder::Decode(const ArrayBufferView* aView,
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const TextDecodeOptions& aOptions,
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nsAString& aOutDecodedString,
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ErrorResult& aRv)
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{
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const char* data;
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int32_t length;
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// If view is not specified, let view be a Uint8Array of length 0.
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if (!aView) {
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data = EmptyCString().BeginReading();
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length = EmptyCString().Length();
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} else {
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data = reinterpret_cast<const char*>(aView->Data());
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length = aView->Length();
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}
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aOutDecodedString.Truncate();
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// Run or resume the decoder algorithm of the decoder object's encoder.
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int32_t outLen;
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nsresult rv = mDecoder->GetMaxLength(data, length, &outLen);
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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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static const fallible_t fallible = fallible_t();
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nsAutoArrayPtr<PRUnichar> buf(new (fallible) PRUnichar[outLen + 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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rv = mDecoder->Convert(data, &length, buf, &outLen);
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MOZ_ASSERT(mFatal || rv != NS_ERROR_ILLEGAL_INPUT);
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buf[outLen] = 0;
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aOutDecodedString.Append(buf, outLen);
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// If the internal streaming flag of the decoder object is not set,
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// then reset the encoding algorithm state to the default values
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if (!aOptions.stream) {
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mDecoder->Reset();
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if (rv == NS_OK_UDEC_MOREINPUT) {
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if (mFatal) {
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aRv.Throw(NS_ERROR_DOM_ENCODING_DECODE_ERR);
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} else {
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// Need to emit a decode error manually
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// to simulate the EOF handling of the Encoding spec.
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aOutDecodedString.Append(kReplacementChar);
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}
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}
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}
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if (NS_FAILED(rv)) {
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aRv.Throw(NS_ERROR_DOM_ENCODING_DECODE_ERR);
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}
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}
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void
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TextDecoder::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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NS_IMPL_CYCLE_COLLECTING_ADDREF(TextDecoder)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(TextDecoder)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TextDecoder)
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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(TextDecoder, mGlobal)
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} // dom
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} // mozilla
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