TextCodecUTF16.cpp [plain text]
#include "config.h"
#include "TextCodecUTF16.h"
#include "CString.h"
#include "PlatformString.h"
using std::auto_ptr;
namespace WebCore {
const UChar BOM = 0xFEFF;
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 auto_ptr<TextCodec> newStreamingTextDecoderUTF16LE(const TextEncoding&, const void*)
{
return auto_ptr<TextCodec>(new TextCodecUTF16(true));
}
static auto_ptr<TextCodec> newStreamingTextDecoderUTF16BE(const TextEncoding&, const void*)
{
return auto_ptr<TextCodec>(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)
{
if (!length)
return String();
const unsigned char* p = reinterpret_cast<const unsigned char*>(bytes);
size_t numBytes = length + m_haveBufferedByte;
size_t numChars = numBytes / 2;
UChar* buffer;
String result = String::newUninitialized(numChars, buffer);
UChar* q = buffer;
if (m_haveBufferedByte) {
UChar c;
if (m_littleEndian)
c = m_bufferedByte | (p[0] << 8);
else
c = (m_bufferedByte << 8) | p[0];
if (c != BOM)
*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;
if (c != BOM)
*q++ = c;
}
else
for (size_t i = 0; i < numChars; ++i) {
UChar c = (p[0] << 8) | p[1];
p += 2;
if (c != BOM)
*q++ = c;
}
if (numBytes & 1) {
ASSERT(!m_haveBufferedByte);
m_haveBufferedByte = true;
m_bufferedByte = p[0];
}
result.truncate(q - buffer);
return result;
}
CString TextCodecUTF16::encode(const UChar* characters, size_t length, bool)
{
char* bytes;
CString string = CString::newUninitialized(length * 2, bytes);
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;
}
}