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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/modules/encoding/text_encoder.h"
#include "base/feature_list.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_text_encoder_encode_into_result.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/modules/encoding/encoding.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/wtf/text/character_visitor.h"
#include "third_party/blink/renderer/platform/wtf/text/text_encoding_registry.h"
namespace blink {
// Controls if TextEncode will throw an exception when failed to allocate
// buffer.
BASE_FEATURE(kThrowExceptionWhenTextEncodeOOM,
"ThrowExceptionWhenTextEncodeOOM",
base::FEATURE_ENABLED_BY_DEFAULT);
TextEncoder* TextEncoder::Create(ExecutionContext* context,
ExceptionState& exception_state) {
return MakeGarbageCollected<TextEncoder>(UTF8Encoding());
}
TextEncoder::TextEncoder(const WTF::TextEncoding& encoding)
: encoding_(encoding), codec_(NewTextCodec(encoding)) {
DCHECK_EQ(encoding_.GetName(), "UTF-8");
}
TextEncoder::~TextEncoder() = default;
String TextEncoder::encoding() const {
String name = encoding_.GetName().GetString().DeprecatedLower();
DCHECK_EQ(name, "utf-8");
return name;
}
NotShared<DOMUint8Array> TextEncoder::encode(const String& input,
ExceptionState& exception_state) {
// Note that the UnencodableHandling here is never used since the
// only possible encoding is UTF-8, which will use
// U+FFFD-replacement rather than ASCII fallback substitution when
// unencodable sequences (for instance, unpaired UTF-16 surrogates)
// are present in the input.
std::string result = WTF::VisitCharacters(input, [this](auto chars) {
return codec_->Encode(chars, WTF::kNoUnencodables);
});
if (base::FeatureList::IsEnabled(kThrowExceptionWhenTextEncodeOOM)) {
NotShared<DOMUint8Array> result_array(
DOMUint8Array::CreateOrNull(base::as_byte_span(result)));
if (result_array.IsNull()) {
exception_state.ThrowDOMException(DOMExceptionCode::kUnknownError,
"Failed to allocate buffer.");
}
return result_array;
}
return NotShared<DOMUint8Array>(
DOMUint8Array::Create(base::as_byte_span(result)));
}
TextEncoderEncodeIntoResult* TextEncoder::encodeInto(
const String& source,
NotShared<DOMUint8Array>& destination) {
TextEncoderEncodeIntoResult* encode_into_result =
TextEncoderEncodeIntoResult::Create();
TextCodec::EncodeIntoResult encode_into_result_data =
WTF::VisitCharacters(source, [this, &destination](auto chars) {
return codec_->EncodeInto(chars, destination->ByteSpan());
});
encode_into_result->setRead(encode_into_result_data.code_units_read);
encode_into_result->setWritten(encode_into_result_data.bytes_written);
return encode_into_result;
}
} // namespace blink
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