mirror of
https://github.com/classilla/tenfourfox.git
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143 lines
4.4 KiB
C++
143 lines
4.4 KiB
C++
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/* -*- 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/EncodingUtils.h"
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#include "mozilla/dom/UnionTypes.h"
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#include "nsContentUtils.h"
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#include <stdint.h>
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namespace mozilla {
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namespace dom {
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static const char16_t kReplacementChar = static_cast<char16_t>(0xFFFD);
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void
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TextDecoder::Init(const nsAString& aLabel, const bool aFatal,
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ErrorResult& aRv)
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{
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nsAutoCString encoding;
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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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if (!EncodingUtils::FindEncodingForLabelNoReplacement(aLabel, encoding)) {
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nsAutoString label(aLabel);
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EncodingUtils::TrimSpaceCharacters(label);
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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(encoding, aFatal);
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}
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void
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TextDecoder::InitWithEncoding(const nsACString& aEncoding, const bool aFatal)
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{
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mEncoding = aEncoding;
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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;
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// Create a decoder object for mEncoding.
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mDecoder = EncodingUtils::DecoderForEncoding(mEncoding);
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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 char* aInput, const int32_t aLength,
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const bool aStream, nsAString& aOutDecodedString,
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ErrorResult& aRv)
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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(aInput, aLength, &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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nsAutoArrayPtr<char16_t> buf(new (fallible) char16_t[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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int32_t length = aLength;
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rv = mDecoder->Convert(aInput, &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 (!aStream) {
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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.ThrowTypeError<MSG_DOM_DECODING_FAILED>();
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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.ThrowTypeError<MSG_DOM_DECODING_FAILED>();
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}
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}
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void
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TextDecoder::Decode(const Optional<ArrayBufferViewOrArrayBuffer>& aBuffer,
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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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if (!aBuffer.WasPassed()) {
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Decode(nullptr, 0, 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().ComputeLengthAndData();
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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().ComputeLengthAndData();
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data = buf.GetAsArrayBuffer().Data();
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length = buf.GetAsArrayBuffer().Length();
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}
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// The other Decode signature takes a signed int, because that's
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// what nsIUnicodeDecoder::Convert takes as the length. Throw if
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// our length is too big.
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if (length > INT32_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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Decode(reinterpret_cast<char*>(data), length, aOptions.mStream,
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aOutDecodedString, aRv);
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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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} // namespace dom
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} // namespace mozilla
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