1 files changed, 96 insertions, 0 deletions
diff --git a/Source/WebCore/platform/text/TextCodecASCIIFastPath.h b/Source/WebCore/platform/text/TextCodecASCIIFastPath.h
new file mode 100644
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+++ b/Source/WebCore/platform/text/TextCodecASCIIFastPath.h
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2011 Apple Inc. All rights reserved.
+ * Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * 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.
+ */
+
+#ifndef TextCodecASCIIFastPath_h
+#define TextCodecASCIIFastPath_h
+
+#include <stdint.h>
+
+namespace WebCore {
+
+// Assuming that a pointer is the size of a "machine word", then
+// uintptr_t is an integer type that is also a machine word.
+typedef uintptr_t MachineWord;
+
+// This constant has type uintptr_t since we will use it to align
+// pointers. Not because MachineWord is uintptr_t.
+const uintptr_t machineWordAlignmentMask = sizeof(MachineWord) - 1;
+
+template<size_t size> struct NonASCIIMask;
+template<> struct NonASCIIMask<4> {
+    static unsigned value() { return 0x80808080U; }
+};
+template<> struct NonASCIIMask<8> {
+    static unsigned long long value() { return 0x8080808080808080ULL; }
+};
+
+template<size_t size> struct UCharByteFiller;
+template<> struct UCharByteFiller<4> {
+    static void copy(UChar* destination, const uint8_t* source)
+    {
+        destination[0] = source[0];
+        destination[1] = source[1];
+        destination[2] = source[2];
+        destination[3] = source[3];
+    }
+};
+template<> struct UCharByteFiller<8> {
+    static void copy(UChar* destination, const uint8_t* source)
+    {
+        destination[0] = source[0];
+        destination[1] = source[1];
+        destination[2] = source[2];
+        destination[3] = source[3];
+        destination[4] = source[4];
+        destination[5] = source[5];
+        destination[6] = source[6];
+        destination[7] = source[7];
+    }
+};
+
+inline bool isAllASCII(MachineWord word)
+{
+    return !(word & NonASCIIMask<sizeof(MachineWord)>::value());
+}
+
+inline void copyASCIIMachineWord(UChar* destination, const uint8_t* source)
+{
+    UCharByteFiller<sizeof(MachineWord)>::copy(destination, source);
+}
+
+inline bool isAlignedToMachineWord(const void* pointer)
+{
+    return !(reinterpret_cast<uintptr_t>(pointer) & machineWordAlignmentMask);
+}
+
+template<typename T> inline T* alignToMachineWord(T* pointer)
+{
+    return reinterpret_cast<T*>(reinterpret_cast<uintptr_t>(pointer) & ~machineWordAlignmentMask);
+}
+
+} // namespace WebCore
+
+#endif // TextCodecASCIIFastPath_h