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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_decoder.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_union_arraybuffer_arraybufferview.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_array_buffer.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_array_buffer_view.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/string_view.h"
#include "third_party/blink/renderer/platform/wtf/text/text_encoding_registry.h"
namespace blink {
TextDecoder* TextDecoder::Create(const String& label,
const TextDecoderOptions* options,
ExceptionState& exception_state) {
WTF::TextEncoding encoding(
label.StripWhiteSpace(&encoding::IsASCIIWhiteSpace));
// The replacement encoding is not valid, but the Encoding API also
// rejects aliases of the replacement encoding.
if (!encoding.IsValid() ||
WTF::EqualIgnoringASCIICase(encoding.GetName(), "replacement")) {
exception_state.ThrowRangeError("The encoding label provided ('" + label +
"') is invalid.");
return nullptr;
}
return MakeGarbageCollected<TextDecoder>(encoding, options->fatal(),
options->ignoreBOM());
}
TextDecoder::TextDecoder(const WTF::TextEncoding& encoding,
bool fatal,
bool ignore_bom)
: encoding_(encoding),
fatal_(fatal),
ignore_bom_(ignore_bom),
bom_seen_(false) {}
TextDecoder::~TextDecoder() = default;
String TextDecoder::encoding() const {
String name = encoding_.GetName().GetString().DeprecatedLower();
// Where possible, encoding aliases should be handled by changes to Chromium's
// ICU or Blink's WTF. The same codec is used, but WTF maintains a different
// name/identity for these.
if (name == "iso-8859-1" || name == "us-ascii")
return "windows-1252";
return name;
}
String TextDecoder::decode(std::optional<base::span<const uint8_t>> input,
const TextDecodeOptions* options,
ExceptionState& exception_state) {
DCHECK(options);
base::span<const uint8_t> input_span =
input.value_or(base::span<const uint8_t>());
if (input_span.size() > std::numeric_limits<uint32_t>::max()) {
exception_state.ThrowRangeError(
"Buffer size exceeds maximum heap object size.");
return String();
}
return Decode(input_span, options, exception_state);
}
String TextDecoder::Decode(base::span<const uint8_t> input,
const TextDecodeOptions* options,
ExceptionState& exception_state) {
DCHECK(options);
if (!do_not_flush_) {
if (!codec_) {
// In the spec, a new decoder is created unconditionally here, but that
// requires an extra allocation. Since the TextCodec would be flushed
// here by the previous call if `!do_not_flush` (sorry about the double
// negatives), then we don't need a new TextCodec to match the spec
// behavior.
// https://encoding.spec.whatwg.org/#dom-textdecoder-decode
codec_ = NewTextCodec(encoding_);
}
bom_seen_ = false;
}
DCHECK(codec_);
do_not_flush_ = options->stream();
WTF::FlushBehavior flush = do_not_flush_ ? WTF::FlushBehavior::kDoNotFlush
: WTF::FlushBehavior::kDataEOF;
bool saw_error = false;
String s = codec_->Decode(input, flush, fatal_, saw_error);
if (fatal_ && saw_error) {
if (!do_not_flush_) {
// If flushing, the error should not persist.
codec_.reset();
}
exception_state.ThrowTypeError("The encoded data was not valid.");
return String();
}
if (!ignore_bom_ && !bom_seen_ && !s.empty()) {
bom_seen_ = true;
if (s[0] == 0xFEFF) {
const AtomicString& name = encoding_.GetName();
if ((name == "UTF-8" || name == "UTF-16LE" || name == "UTF-16BE")) {
s.Remove(0);
}
}
}
return s;
}
String TextDecoder::decode(ExceptionState& exception_state) {
TextDecodeOptions* options = TextDecodeOptions::Create();
return Decode({}, options, exception_state);
}
} // namespace blink
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