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/*
* 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 "config.h"
#include "TextCodecUTF16.h"
#include "PlatformString.h"
#include <wtf/text/CString.h>
#include <wtf/text/StringBuffer.h>
#include <wtf/PassOwnPtr.h>
using namespace std;
namespace WebCore {
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 PassOwnPtr<TextCodec> newStreamingTextDecoderUTF16LE(const TextEncoding&, const void*)
{
return new TextCodecUTF16(true);
}
static PassOwnPtr<TextCodec> newStreamingTextDecoderUTF16BE(const TextEncoding&, const void*)
{
return 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, bool, bool, bool&)
{
if (!length)
return String();
// 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 numChars = numBytes / 2;
StringBuffer buffer(numChars);
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;
numChars -= 1;
}
if (m_littleEndian) {
for (size_t i = 0; i < numChars; ++i) {
UChar c = p[0] | (p[1] << 8);
p += 2;
*q++ = c;
}
} else {
for (size_t i = 0; i < numChars; ++i) {
UChar c = (p[0] << 8) | p[1];
p += 2;
*q++ = c;
}
}
if (numBytes & 1) {
ASSERT(!m_haveBufferedByte);
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 string = 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] = 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] = c;
}
}
return string;
}
} // namespace WebCore
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