Remove dedicated TextCodecUTF16

third_party/WebKit/Source/wtf/text/TextCodecUTF16.cpp

-/*
- * Copyright (C) 2004, 2006, 2008, 2010 Apple 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:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. 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.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 "wtf/text/TextCodecUTF16.h"
-
-#include "wtf/PtrUtil.h"
-#include "wtf/text/CString.h"
-#include "wtf/text/CharacterNames.h"
-#include "wtf/text/StringBuffer.h"
-#include "wtf/text/WTFString.h"
-#include <memory>
-
-using namespace std;
-
-namespace WTF {
-
-void TextCodecUTF16::registerEncodingNames(EncodingNameRegistrar registrar)
-{
-    registrar("UTF-16LE", "UTF-16LE");
-    registrar("UTF-16BE", "UTF-16BE");
-
-    registrar("ISO-10646-UCS-2", "UTF-16LE");
-    registrar("UCS-2", "UTF-16LE");
-    registrar("UTF-16", "UTF-16LE");
-    registrar("Unicode", "UTF-16LE");
-    registrar("csUnicode", "UTF-16LE");
-    registrar("unicodeFEFF", "UTF-16LE");
-
-    registrar("unicodeFFFE", "UTF-16BE");
-}
-
-static std::unique_ptr<TextCodec> newStreamingTextDecoderUTF16LE(const TextEncoding&, const void*)
-{
-    return wrapUnique(new TextCodecUTF16(true));
-}
-
-static std::unique_ptr<TextCodec> newStreamingTextDecoderUTF16BE(const TextEncoding&, const void*)
-{
-    return wrapUnique(new TextCodecUTF16(false));
-}
-
-void TextCodecUTF16::registerCodecs(TextCodecRegistrar registrar)
-{
-    registrar("UTF-16LE", newStreamingTextDecoderUTF16LE, 0);
-    registrar("UTF-16BE", newStreamingTextDecoderUTF16BE, 0);
-}
-
-String TextCodecUTF16::decode(const char* bytes, size_t length, FlushBehavior flush, bool, bool& sawError)
-{
-    // For compatibility reasons, ignore flush from fetch EOF.
-    const bool reallyFlush = flush != DoNotFlush && flush != FetchEOF;
-
-    if (!length) {
-        if (!reallyFlush || !m_haveBufferedByte)
-            return String();
-        sawError = true;
-        return String(&replacementCharacter, 1);
-    }
-
-    // FIXME: This should generate an error if there is an unpaired surrogate.
-
-    const unsigned char* p = reinterpret_cast<const unsigned char*>(bytes);
-    size_t numBytes = length + m_haveBufferedByte;
-    size_t numCharsIn = numBytes / 2;
-    size_t numCharsOut = ((numBytes & 1) && reallyFlush) ? numCharsIn + 1 : numCharsIn;
-
-    StringBuffer<UChar> buffer(numCharsOut);
-    UChar* q = buffer.characters();
-
-    if (m_haveBufferedByte) {
-        UChar c;
-        if (m_littleEndian)
-            c = m_bufferedByte | (p[0] << 8);
-        else
-            c = (m_bufferedByte << 8) | p[0];
-        *q++ = c;
-        m_haveBufferedByte = false;
-        p += 1;
-        numCharsIn -= 1;
-    }
-
-    if (m_littleEndian) {
-        for (size_t i = 0; i < numCharsIn; ++i) {
-            UChar c = p[0] | (p[1] << 8);
-            p += 2;
-            *q++ = c;
-        }
-    } else {
-        for (size_t i = 0; i < numCharsIn; ++i) {
-            UChar c = (p[0] << 8) | p[1];
-            p += 2;
-            *q++ = c;
-        }
-    }
-
-    if (numBytes & 1) {
-        ASSERT(!m_haveBufferedByte);
-
-        if (reallyFlush) {
-            sawError = true;
-            *q++ = replacementCharacter;
-        } else {
-            m_haveBufferedByte = true;
-            m_bufferedByte = p[0];
-        }
-    }
-
-    buffer.shrink(q - buffer.characters());
-
-    return String::adopt(buffer);
-}
-
-CString TextCodecUTF16::encode(const UChar* characters, size_t length, UnencodableHandling)
-{
-    // We need to be sure we can double the length without overflowing.
-    // Since the passed-in length is the length of an actual existing
-    // character buffer, each character is two bytes, and we know
-    // the buffer doesn't occupy the entire address space, we can
-    // assert here that doubling the length does not overflow size_t
-    // and there's no need for a runtime check.
-    ASSERT(length <= numeric_limits<size_t>::max() / 2);
-
-    char* bytes;
-    CString result = CString::newUninitialized(length * 2, bytes);
-
-    // FIXME: CString is not a reasonable data structure for encoded UTF-16, which will have
-    // null characters inside it. Perhaps the result of encode should not be a CString.
-    if (m_littleEndian) {
-        for (size_t i = 0; i < length; ++i) {
-            UChar c = characters[i];
-            bytes[i * 2] = static_cast<char>(c);
-            bytes[i * 2 + 1] = c >> 8;
-        }
-    } else {
-        for (size_t i = 0; i < length; ++i) {
-            UChar c = characters[i];
-            bytes[i * 2] = c >> 8;
-            bytes[i * 2 + 1] = static_cast<char>(c);
-        }
-    }
-
-    return result;
-}
-
-CString TextCodecUTF16::encode(const LChar* characters, size_t length, UnencodableHandling)
-{
-    // In the LChar case, we do actually need to perform this check in release.  :)
-    RELEASE_ASSERT(length <= numeric_limits<size_t>::max() / 2);
-
-    char* bytes;
-    CString result = CString::newUninitialized(length * 2, bytes);
-
-    if (m_littleEndian) {
-        for (size_t i = 0; i < length; ++i) {
-            bytes[i * 2] = characters[i];
-            bytes[i * 2 + 1] = 0;
-        }
-    } else {
-        for (size_t i = 0; i < length; ++i) {
-            bytes[i * 2] = 0;
-            bytes[i * 2 + 1] = characters[i];
-        }
-    }
-
-    return result;
-}
-
-} // namespace WTF