Imported WebKit commit 3a8c29f35d00659d2ce7a0ccdfa8304f14e82327 (http://svn.webkit.org/repository/webkit/trunk@120813)

New snapshot with Windows build fixes

1 files changed, 119 insertions, 0 deletions

diff --git a/Source/WTF/wtf/StreamBuffer.h b/Source/WTF/wtf/StreamBuffer.h
new file mode 100644
index 000000000..add2549d6
--- /dev/null
+++ b/Source/WTF/wtf/StreamBuffer.h
@@ -0,0 +1,119 @@
+/*
+* Copyright (C) 2012 Google 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:
+*
+*     * Redistributions of source code must retain the above copyright
+* notice, this list of conditions and the following disclaimer.
+*     * 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.
+*     * Neither the name of Google Inc. nor the names of its
+* contributors may be used to endorse or promote products derived from
+* this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+* "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 THE COPYRIGHT
+* OWNER 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 WTF_StreamBuffer_h
+#define WTF_StreamBuffer_h
+
+#include <wtf/Deque.h>
+#include <wtf/FixedArray.h>
+#include <wtf/OwnPtr.h>
+#include <wtf/PassOwnPtr.h>
+
+namespace WTF {
+
+template <typename T, size_t BlockSize> class StreamBuffer {
+private:
+    typedef Vector<T> Block;
+public:
+    StreamBuffer()
+        : m_size(0)
+        , m_readOffset(0)
+    {
+    }
+
+    ~StreamBuffer()
+    {
+    }
+
+    bool isEmpty() const { return !size(); }
+
+    void append(const T* data, size_t size)
+    {
+        if (!size)
+            return;
+
+        m_size += size;
+        while (size) {
+            if (!m_buffer.size() || m_buffer.last()->size() == BlockSize)
+                m_buffer.append(adoptPtr(new Block));
+            size_t appendSize = min(BlockSize - m_buffer.last()->size(), size);
+            m_buffer.last()->append(data, appendSize);
+            data += appendSize;
+            size -= appendSize;
+        }
+    }
+
+    // This function consume data in the fist block.
+    // Specified size must be less than over equal to firstBlockSize().
+    void consume(size_t size)
+    {
+        ASSERT(m_size >= size);
+        if (!m_size)
+            return;
+
+        ASSERT(m_buffer.size() > 0);
+        ASSERT(m_readOffset + size <= m_buffer.first()->size());
+        m_readOffset += size;
+        m_size -= size;
+        if (m_readOffset >= m_buffer.first()->size()) {
+            m_readOffset = 0;
+            m_buffer.removeFirst();
+        }
+    }
+
+    size_t size() const { return m_size; }
+
+    const T* firstBlockData() const
+    {
+        if (!m_size)
+            return 0;
+        ASSERT(m_buffer.size() > 0);
+        return &m_buffer.first()->data()[m_readOffset];
+    }
+
+    size_t firstBlockSize() const
+    {
+        if (!m_size)
+            return 0;
+        ASSERT(m_buffer.size() > 0);
+        return m_buffer.first()->size() - m_readOffset;
+    }
+
+private:
+    size_t m_size;
+    size_t m_readOffset;
+    Deque<OwnPtr<Block> > m_buffer;
+};
+
+} // namespace WTF
+
+using WTF::StreamBuffer;
+
+#endif // WTF_StreamBuffer_h