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      1 /*
      2  * Copyright (C) 2007, 2008 Apple, 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "TextCodecUserDefined.h"
     28 
     29 #include "PlatformString.h"
     30 #include <stdio.h>
     31 #include <wtf/text/CString.h>
     32 #include <wtf/text/StringBuffer.h>
     33 #include <wtf/PassOwnPtr.h>
     34 
     35 namespace WebCore {
     36 
     37 void TextCodecUserDefined::registerEncodingNames(EncodingNameRegistrar registrar)
     38 {
     39     registrar("x-user-defined", "x-user-defined");
     40 }
     41 
     42 static PassOwnPtr<TextCodec> newStreamingTextDecoderUserDefined(const TextEncoding&, const void*)
     43 {
     44     return new TextCodecUserDefined;
     45 }
     46 
     47 void TextCodecUserDefined::registerCodecs(TextCodecRegistrar registrar)
     48 {
     49     registrar("x-user-defined", newStreamingTextDecoderUserDefined, 0);
     50 }
     51 
     52 String TextCodecUserDefined::decode(const char* bytes, size_t length, bool, bool, bool&)
     53 {
     54     UChar* buffer;
     55     String result = String::createUninitialized(length, buffer);
     56 
     57     for (size_t i = 0; i < length; ++i) {
     58         signed char c = bytes[i];
     59         buffer[i] = c & 0xF7FF;
     60     }
     61 
     62     return result;
     63 }
     64 
     65 static CString encodeComplexUserDefined(const UChar* characters, size_t length, UnencodableHandling handling)
     66 {
     67     Vector<char> result(length);
     68     char* bytes = result.data();
     69 
     70     size_t resultLength = 0;
     71     for (size_t i = 0; i < length; ) {
     72         UChar32 c;
     73         U16_NEXT(characters, i, length, c);
     74         signed char signedByte = c;
     75         if ((signedByte & 0xF7FF) == c)
     76             bytes[resultLength++] = signedByte;
     77         else {
     78             // No way to encode this character with x-user-defined.
     79             UnencodableReplacementArray replacement;
     80             int replacementLength = TextCodec::getUnencodableReplacement(c, handling, replacement);
     81             result.grow(resultLength + replacementLength + length - i);
     82             bytes = result.data();
     83             memcpy(bytes + resultLength, replacement, replacementLength);
     84             resultLength += replacementLength;
     85         }
     86     }
     87 
     88     return CString(bytes, resultLength);
     89 }
     90 
     91 CString TextCodecUserDefined::encode(const UChar* characters, size_t length, UnencodableHandling handling)
     92 {
     93     char* bytes;
     94     CString string = CString::newUninitialized(length, bytes);
     95 
     96     // Convert the string a fast way and simultaneously do an efficient check to see if it's all ASCII.
     97     UChar ored = 0;
     98     for (size_t i = 0; i < length; ++i) {
     99         UChar c = characters[i];
    100         bytes[i] = c;
    101         ored |= c;
    102     }
    103 
    104     if (!(ored & 0xFF80))
    105         return string;
    106 
    107     // If it wasn't all ASCII, call the function that handles more-complex cases.
    108     return encodeComplexUserDefined(characters, length, handling);
    109 }
    110 
    111 } // namespace WebCore
    112