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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 
     33 #include "modules/encoding/TextDecoder.h"
     34 
     35 #include "bindings/v8/ExceptionState.h"
     36 #include "core/dom/ExceptionCode.h"
     37 #include "wtf/text/TextEncodingRegistry.h"
     38 
     39 namespace WebCore {
     40 
     41 PassRefPtr<TextDecoder> TextDecoder::create(const String& label, const Dictionary& options, ExceptionState& es)
     42 {
     43     const String& encodingLabel = label.isNull() ? String("utf-8") : label;
     44 
     45     WTF::TextEncoding encoding(encodingLabel);
     46     if (!encoding.isValid()) {
     47         es.throwTypeError();
     48         return 0;
     49     }
     50 
     51     bool fatal = false;
     52     options.get("fatal", fatal);
     53 
     54     return adoptRef(new TextDecoder(encoding.name(), fatal));
     55 }
     56 
     57 
     58 TextDecoder::TextDecoder(const String& encoding, bool fatal)
     59     : m_encoding(encoding)
     60     , m_codec(newTextCodec(m_encoding))
     61     , m_fatal(fatal)
     62 {
     63 }
     64 
     65 TextDecoder::~TextDecoder()
     66 {
     67 }
     68 
     69 String TextDecoder::encoding() const
     70 {
     71     return String(m_encoding.name()).lower();
     72 }
     73 
     74 String TextDecoder::decode(ArrayBufferView* input, const Dictionary& options, ExceptionState& es)
     75 {
     76     bool stream = false;
     77     options.get("stream", stream);
     78 
     79     const char* start = input ? static_cast<const char*>(input->baseAddress()) : 0;
     80     size_t length = input ? input->byteLength() : 0;
     81 
     82     bool flush = !stream;
     83 
     84     // FIXME: Not all TextCodec implementations handle |flush| - notably TextCodecUTF16
     85     // ignores it and never flushes!
     86 
     87     bool sawError = false;
     88     String s = m_codec->decode(start, length, flush, m_fatal, sawError);
     89 
     90     if (m_fatal && sawError) {
     91         es.throwDOMException(EncodingError, "The encoded data was not valid.");
     92         return String();
     93     }
     94 
     95     return s;
     96 }
     97 
     98 } // namespace WebCore
     99