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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/core/v8/ExceptionState.h"
     36 #include "wtf/text/CString.h"
     37 #include "wtf/text/TextEncodingRegistry.h"
     38 
     39 namespace blink {
     40 
     41 TextEncoder* TextEncoder::create(const String& utfLabel, ExceptionState& exceptionState)
     42 {
     43     WTF::TextEncoding encoding(utfLabel);
     44     if (!encoding.isValid()) {
     45         exceptionState.throwTypeError("The encoding label provided ('" + utfLabel + "') is invalid.");
     46         return 0;
     47     }
     48 
     49     String name(encoding.name());
     50     if (name != "UTF-8" && name != "UTF-16LE" && name != "UTF-16BE") {
     51         exceptionState.throwTypeError("The encoding provided ('" + utfLabel + "') is not one of 'utf-8', 'utf-16', or 'utf-16be'.");
     52         return 0;
     53     }
     54 
     55     return new TextEncoder(encoding);
     56 }
     57 
     58 TextEncoder::TextEncoder(const WTF::TextEncoding& encoding)
     59     : m_encoding(encoding)
     60     , m_codec(newTextCodec(encoding))
     61 {
     62 }
     63 
     64 TextEncoder::~TextEncoder()
     65 {
     66 }
     67 
     68 String TextEncoder::encoding() const
     69 {
     70     String name = String(m_encoding.name()).lower();
     71     ASSERT(name == "utf-8" || name == "utf-16le" || name == "utf-16be");
     72     return name;
     73 }
     74 
     75 PassRefPtr<Uint8Array> TextEncoder::encode(const String& input)
     76 {
     77     CString result;
     78     if (input.is8Bit())
     79         result = m_codec->encode(input.characters8(), input.length(), WTF::QuestionMarksForUnencodables);
     80     else
     81         result = m_codec->encode(input.characters16(), input.length(), WTF::QuestionMarksForUnencodables);
     82 
     83     const char* buffer = result.data();
     84     const unsigned char* unsignedBuffer = reinterpret_cast<const unsigned char*>(buffer);
     85 
     86     return Uint8Array::create(unsignedBuffer, result.length());
     87 }
     88 
     89 } // namespace blink
     90