gecko-dev/dom/encoding/TextDecoder.cpp

135 строки
4.0 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/TextDecoder.h"
#include "mozilla/dom/UnionTypes.h"
#include "mozilla/Encoding.h"
#include "mozilla/UniquePtrExtensions.h"
#include "nsContentUtils.h"
#include <stdint.h>
namespace mozilla {
namespace dom {
void
TextDecoder::Init(const nsAString& aLabel, const bool aFatal,
ErrorResult& aRv)
{
// Let encoding be the result of getting an encoding from label.
// If encoding is failure or replacement, throw a RangeError
// (https://encoding.spec.whatwg.org/#dom-textdecoder).
const Encoding* encoding = Encoding::ForLabelNoReplacement(aLabel);
if (!encoding) {
nsAutoString label(aLabel);
label.Trim(" \t\n\f\r");
aRv.ThrowRangeError<MSG_ENCODING_NOT_SUPPORTED>(label);
return;
}
InitWithEncoding(WrapNotNull(encoding), aFatal);
}
void
TextDecoder::InitWithEncoding(NotNull<const Encoding*> aEncoding,
const bool aFatal)
{
aEncoding->Name(mEncoding);
// If the constructor is called with an options argument,
// and the fatal property of the dictionary is set,
// set the internal fatal flag of the decoder object.
mFatal = aFatal;
// Create a decoder object for mEncoding.
mDecoder = aEncoding->NewDecoderWithBOMRemoval();
}
void
TextDecoder::Decode(Span<const uint8_t> aInput,
const bool aStream,
nsAString& aOutDecodedString,
ErrorResult& aRv)
{
aOutDecodedString.Truncate();
CheckedInt<size_t> needed = mDecoder->MaxUTF16BufferLength(aInput.Length());
if (!needed.isValid() ||
needed.value() > MaxValue<nsAString::size_type>::value) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
if (!aOutDecodedString.SetLength(needed.value(), fallible)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
uint32_t result;
size_t read;
size_t written;
bool hadErrors;
if (mFatal) {
Tie(result, read, written) = mDecoder->DecodeToUTF16WithoutReplacement(
aInput, aOutDecodedString, !aStream);
if (result != kInputEmpty) {
aRv.ThrowTypeError<MSG_DOM_DECODING_FAILED>();
return;
}
} else {
Tie(result, read, written, hadErrors) =
mDecoder->DecodeToUTF16(aInput, aOutDecodedString, !aStream);
}
MOZ_ASSERT(result == kInputEmpty);
MOZ_ASSERT(read == aInput.Length());
MOZ_ASSERT(written <= aOutDecodedString.Length());
Unused << hadErrors;
if (!aOutDecodedString.SetLength(written, fallible)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
// If the internal streaming flag of the decoder object is not set,
// then reset the encoding algorithm state to the default values
if (!aStream) {
mDecoder->Encoding()->NewDecoderWithBOMRemovalInto(*mDecoder);
}
}
void
TextDecoder::Decode(const Optional<ArrayBufferViewOrArrayBuffer>& aBuffer,
const TextDecodeOptions& aOptions,
nsAString& aOutDecodedString,
ErrorResult& aRv)
{
if (!aBuffer.WasPassed()) {
Decode(nullptr, aOptions.mStream, aOutDecodedString, aRv);
return;
}
const ArrayBufferViewOrArrayBuffer& buf = aBuffer.Value();
uint8_t* data;
uint32_t length;
if (buf.IsArrayBufferView()) {
buf.GetAsArrayBufferView().ComputeLengthAndData();
data = buf.GetAsArrayBufferView().Data();
length = buf.GetAsArrayBufferView().Length();
} else {
MOZ_ASSERT(buf.IsArrayBuffer());
buf.GetAsArrayBuffer().ComputeLengthAndData();
data = buf.GetAsArrayBuffer().Data();
length = buf.GetAsArrayBuffer().Length();
}
Decode(MakeSpan(data, length), aOptions.mStream, aOutDecodedString, aRv);
}
void
TextDecoder::GetEncoding(nsAString& aEncoding)
{
CopyASCIItoUTF16(mEncoding, aEncoding);
nsContentUtils::ASCIIToLower(aEncoding);
}
} // namespace dom
} // namespace mozilla