зеркало из https://github.com/mozilla/gecko-dev.git
128 строки
4.2 KiB
C++
128 строки
4.2 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/TextDecoder.h"
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#include "mozilla/dom/UnionTypes.h"
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#include "mozilla/Encoding.h"
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#include "mozilla/UniquePtrExtensions.h"
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#include "nsContentUtils.h"
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#include <stdint.h>
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namespace mozilla::dom {
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void TextDecoder::Init(const nsAString& aLabel,
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const TextDecoderOptions& aOptions, ErrorResult& aRv) {
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// Let encoding be the result of getting an encoding from label.
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// If encoding is failure or replacement, throw a RangeError
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// (https://encoding.spec.whatwg.org/#dom-textdecoder).
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const Encoding* encoding = Encoding::ForLabelNoReplacement(aLabel);
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if (!encoding) {
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NS_ConvertUTF16toUTF8 label(aLabel);
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label.Trim(" \t\n\f\r");
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aRv.ThrowRangeError<MSG_ENCODING_NOT_SUPPORTED>(label);
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return;
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}
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InitWithEncoding(WrapNotNull(encoding), aOptions);
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}
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void TextDecoder::InitWithEncoding(NotNull<const Encoding*> aEncoding,
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const TextDecoderOptions& aOptions) {
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aEncoding->Name(mEncoding);
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// Store the flags passed via our options dictionary.
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mFatal = aOptions.mFatal;
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mIgnoreBOM = aOptions.mIgnoreBOM;
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// Create a decoder object for mEncoding.
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if (mIgnoreBOM) {
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mDecoder = aEncoding->NewDecoderWithoutBOMHandling();
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} else {
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mDecoder = aEncoding->NewDecoderWithBOMRemoval();
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}
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}
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void TextDecoder::Decode(Span<const uint8_t> aInput, const bool aStream,
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nsAString& aOutDecodedString, ErrorResult& aRv) {
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aOutDecodedString.Truncate();
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CheckedInt<size_t> needed = mDecoder->MaxUTF16BufferLength(aInput.Length());
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if (!needed.isValid() ||
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needed.value() > std::numeric_limits<nsAString::size_type>::max()) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return;
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}
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auto output = aOutDecodedString.GetMutableData(needed.value(), fallible);
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if (!output) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return;
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}
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uint32_t result;
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size_t read;
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size_t written;
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bool hadErrors;
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if (mFatal) {
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Tie(result, read, written) =
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mDecoder->DecodeToUTF16WithoutReplacement(aInput, *output, !aStream);
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if (result != kInputEmpty) {
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aRv.ThrowTypeError<MSG_DOM_DECODING_FAILED>();
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return;
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}
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} else {
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Tie(result, read, written, hadErrors) =
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mDecoder->DecodeToUTF16(aInput, *output, !aStream);
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}
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MOZ_ASSERT(result == kInputEmpty);
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MOZ_ASSERT(read == aInput.Length());
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MOZ_ASSERT(written <= aOutDecodedString.Length());
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Unused << hadErrors;
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if (!aOutDecodedString.SetLength(written, fallible)) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return;
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}
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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 (!aStream) {
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if (mIgnoreBOM) {
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mDecoder->Encoding()->NewDecoderWithoutBOMHandlingInto(*mDecoder);
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} else {
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mDecoder->Encoding()->NewDecoderWithBOMRemovalInto(*mDecoder);
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}
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}
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}
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void TextDecoder::Decode(const Optional<ArrayBufferViewOrArrayBuffer>& aBuffer,
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const TextDecodeOptions& aOptions,
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nsAString& aOutDecodedString, ErrorResult& aRv) {
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if (!aBuffer.WasPassed()) {
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Decode(nullptr, aOptions.mStream, aOutDecodedString, aRv);
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return;
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}
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const ArrayBufferViewOrArrayBuffer& buf = aBuffer.Value();
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uint8_t* data;
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uint32_t length;
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if (buf.IsArrayBufferView()) {
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buf.GetAsArrayBufferView().ComputeState();
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data = buf.GetAsArrayBufferView().Data();
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length = buf.GetAsArrayBufferView().Length();
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} else {
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MOZ_ASSERT(buf.IsArrayBuffer());
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buf.GetAsArrayBuffer().ComputeState();
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data = buf.GetAsArrayBuffer().Data();
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length = buf.GetAsArrayBuffer().Length();
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}
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Decode(Span(data, length), aOptions.mStream, aOutDecodedString, aRv);
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}
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void TextDecoder::GetEncoding(nsAString& aEncoding) {
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CopyASCIItoUTF16(mEncoding, aEncoding);
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nsContentUtils::ASCIIToLower(aEncoding);
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}
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} // namespace mozilla::dom
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