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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/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/string_extras.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() || !strcasecmp(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 = String(encoding_.GetName()).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(const BufferSource& input,
const TextDecodeOptions* options,
ExceptionState& exception_state) {
DCHECK(options);
DCHECK(!input.IsNull());
if (input.IsArrayBufferView()) {
const char* start = static_cast<const char*>(
input.GetAsArrayBufferView().View()->BaseAddress());
uint32_t length = input.GetAsArrayBufferView().View()->byteLength();
return decode(start, length, options, exception_state);
}
DCHECK(input.IsArrayBuffer());
const char* start =
static_cast<const char*>(input.GetAsArrayBuffer()->Data());
uint32_t length = input.GetAsArrayBuffer()->ByteLength();
return decode(start, length, options, exception_state);
}
String TextDecoder::decode(const char* start,
uint32_t length,
const TextDecodeOptions* options,
ExceptionState& exception_state) {
DCHECK(options);
if (!do_not_flush_) {
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(start, length, flush, fatal_, saw_error);
if (fatal_ && saw_error) {
exception_state.ThrowTypeError("The encoded data was not valid.");
return String();
}
if (!ignore_bom_ && !bom_seen_ && !s.IsEmpty()) {
bom_seen_ = true;
String name(encoding_.GetName());
if ((name == "UTF-8" || name == "UTF-16LE" || name == "UTF-16BE") &&
s[0] == 0xFEFF)
s.Remove(0);
}
return s;
}
String TextDecoder::decode(ExceptionState& exception_state) {
TextDecodeOptions* options = TextDecodeOptions::Create();
return decode(nullptr, 0, options, exception_state);
}
} // namespace blink
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