--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/webengine/osswebengine/WebCore/platform/TextDecoder.cpp	Mon Mar 30 12:54:55 2009 +0300
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2004, 2006 Apple Computer, 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 "TextDecoder.h"
+
+#include "TextEncodingRegistry.h"
+
+// FIXME: Would be nice to also handle BOM for UTF-7 and UTF-32.
+
+namespace WebCore {
+
+TextDecoder::TextDecoder(const TextEncoding& encoding)
+    : m_encoding(encoding)
+    , m_checkedForBOM(false)
+    , m_numBufferedBytes(0)
+{
+}
+
+void TextDecoder::reset(const TextEncoding& encoding)
+{
+    m_encoding = encoding;
+    m_codec.clear();
+    m_checkedForBOM = false;
+    m_numBufferedBytes = 0;
+}
+
+String TextDecoder::checkForBOM(const char* data, size_t length, bool flush)
+{
+    // Check to see if we found a BOM.
+    size_t numBufferedBytes = m_numBufferedBytes;
+    size_t buf1Len = numBufferedBytes;
+    size_t buf2Len = length;
+    const unsigned char* buf1 = m_bufferedBytes;
+    const unsigned char* buf2 = reinterpret_cast<const unsigned char*>(data);
+    unsigned char c1 = buf1Len ? (--buf1Len, *buf1++) : buf2Len ? (--buf2Len, *buf2++) : 0;
+    unsigned char c2 = buf1Len ? (--buf1Len, *buf1++) : buf2Len ? (--buf2Len, *buf2++) : 0;
+    unsigned char c3 = buf1Len ? (--buf1Len, *buf1++) : buf2Len ? (--buf2Len, *buf2++) : 0;
+    unsigned char c4 = buf2Len ? (--buf2Len, *buf2++) : 0;
+
+    const TextEncoding* encodingConsideringBOM = &m_encoding;
+    bool foundBOM = true;
+    if (c1 == 0xFF && c2 == 0xFE) {
+        if (c3 != 0 || c4 != 0) 
+            encodingConsideringBOM = &UTF16LittleEndianEncoding();
+        else if (numBufferedBytes + length > sizeof(m_bufferedBytes))
+            encodingConsideringBOM = &UTF32LittleEndianEncoding();
+        else
+            foundBOM = false;
+    }
+    else if (c1 == 0xEF && c2 == 0xBB && c3 == 0xBF)
+        encodingConsideringBOM = &UTF8Encoding();
+    else if (c1 == 0xFE && c2 == 0xFF)
+        encodingConsideringBOM = &UTF16BigEndianEncoding();
+    else if (c1 == 0 && c2 == 0 && c3 == 0xFE && c4 == 0xFF)
+        encodingConsideringBOM = &UTF32BigEndianEncoding();
+    else
+        foundBOM = false;
+    if (!foundBOM && numBufferedBytes + length <= sizeof(m_bufferedBytes) && !flush) {
+        // Continue to look for the BOM.
+        memcpy(&m_bufferedBytes[numBufferedBytes], data, length);
+        m_numBufferedBytes += length;
+        return "";
+    }
+
+    // Done checking for BOM.
+    m_codec.set(newTextCodec(*encodingConsideringBOM).release());
+    if (!m_codec)
+        return String();
+    m_checkedForBOM = true;
+
+    // Handle case where we have some buffered bytes to deal with.
+    if (numBufferedBytes) {
+        char bufferedBytes[sizeof(m_bufferedBytes)];
+        memcpy(bufferedBytes, m_bufferedBytes, numBufferedBytes);
+        m_numBufferedBytes = 0;
+        return m_codec->decode(bufferedBytes, numBufferedBytes, false)
+            + m_codec->decode(data, length, flush);
+    }
+
+    return m_codec->decode(data, length, flush);
+}
+
+} // namespace WebCore