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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/TextEncoder.h"
     34 
     35 #include "bindings/v8/Dictionary.h"
     36 #include "bindings/v8/ExceptionState.h"
     37 #include "wtf/text/CString.h"
     38 #include "wtf/text/TextEncodingRegistry.h"
     39 
     40 namespace WebCore {
     41 
     42 PassRefPtr<TextEncoder> TextEncoder::create(const String& utfLabel, ExceptionState& exceptionState)
     43 {
     44     const String& encodingLabel = utfLabel.isNull() ? String("utf-8") : utfLabel;
     45 
     46     WTF::TextEncoding encoding(encodingLabel);
     47     if (!encoding.isValid()) {
     48         exceptionState.throwUninformativeAndGenericTypeError();
     49         return 0;
     50     }
     51 
     52     String name(encoding.name());
     53     if (name != "UTF-8" && name != "UTF-16LE" && name != "UTF-16BE") {
     54         exceptionState.throwUninformativeAndGenericTypeError();
     55         return 0;
     56     }
     57 
     58     return adoptRef(new TextEncoder(encoding.name()));
     59 }
     60 
     61 TextEncoder::TextEncoder(const String& encoding)
     62     : m_encoding(encoding)
     63     , m_codec(newTextCodec(m_encoding))
     64 {
     65 }
     66 
     67 TextEncoder::~TextEncoder()
     68 {
     69 }
     70 
     71 String TextEncoder::encoding() const
     72 {
     73     String name = String(m_encoding.name()).lower();
     74     ASSERT(name == "utf-8" || name == "utf-16le" || name == "utf-16be");
     75     return name;
     76 }
     77 
     78 PassRefPtr<Uint8Array> TextEncoder::encode(const String& input, const Dictionary& options)
     79 {
     80     bool stream = false;
     81     options.get("stream", stream);
     82 
     83     // FIXME: Not flushing is not supported by TextCodec for encode; add it or
     84     // handle split surrogates here.
     85 
     86     CString result;
     87     if (input.is8Bit())
     88         result = m_codec->encode(input.characters8(), input.length(), WTF::QuestionMarksForUnencodables);
     89     else
     90         result = m_codec->encode(input.characters16(), input.length(), WTF::QuestionMarksForUnencodables);
     91 
     92     const char* buffer = result.data();
     93     const unsigned char* unsignedBuffer = reinterpret_cast<const unsigned char*>(buffer);
     94 
     95     return Uint8Array::create(unsignedBuffer, result.length());
     96 }
     97 
     98 } // namespace WebCore
     99