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diff --git a/WebCore/platform/network/BlobData.h b/WebCore/platform/network/BlobData.h
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+/*
+ * Copyright (C) 2010 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 BlobData_h
+#define BlobData_h
+
+#include "KURL.h"
+#include "PlatformString.h"
+#include <wtf/PassOwnPtr.h>
+#include <wtf/Vector.h>
+#include <wtf/text/CString.h>
+
+namespace WebCore {
+
+struct BlobDataItem {
+    static const long long toEndOfFile;
+    static const double doNotCheckFileChange;
+
+    // Default constructor.
+    BlobDataItem()
+        : offset(0)
+        , length(toEndOfFile)
+        , expectedModificationTime(doNotCheckFileChange)
+    {
+    }
+
+    // Constructor for String type.
+    BlobDataItem(const CString& data)
+        : type(Data)
+        , data(data)
+        , offset(0)
+        , length(toEndOfFile)
+        , expectedModificationTime(doNotCheckFileChange)
+    {
+    }
+
+    // Constructor for File type (complete file).
+    BlobDataItem(const String& path)
+        : type(File)
+        , path(path)
+        , offset(0)
+        , length(toEndOfFile)
+        , expectedModificationTime(doNotCheckFileChange)
+    {
+    }
+
+    // Constructor for File type (partial file).
+    BlobDataItem(const String& path, long long offset, long long length, double expectedModificationTime)
+        : type(File)
+        , path(path)
+        , offset(offset)
+        , length(length)
+        , expectedModificationTime(expectedModificationTime)
+    {
+    }
+    
+    // Constructor for Blob type.
+    BlobDataItem(const KURL& url, long long offset, long long length)
+        : type(Blob)
+        , url(url)
+        , offset(offset)
+        , length(length)
+        , expectedModificationTime(doNotCheckFileChange)
+    {
+    }
+
+    // Gets a copy of the data suitable for passing to another thread.
+    void copy(const BlobDataItem&);
+
+    enum { Data, File, Blob } type;
+    
+    // For Data type.
+    CString data;
+
+    // For File type.
+    String path;
+
+    // For Blob type.
+    KURL url;
+
+    // For File and Blob type.
+    long long offset;
+    long long length;
+
+    // For File type only.
+    double expectedModificationTime;
+};
+
+typedef Vector<BlobDataItem> BlobDataItemList;
+
+class BlobData {
+public:
+    static PassOwnPtr<BlobData> create()
+    {
+        return adoptPtr(new BlobData());
+    }
+
+    // Gets a copy of the data suitable for passing to another thread.
+    PassOwnPtr<BlobData> copy() const;
+
+    const String& contentType() const { return m_contentType; }
+    void setContentType(const String& contentType) { m_contentType = contentType; }
+
+    const String& contentDisposition() const { return m_contentDisposition; }
+    void setContentDisposition(const String& contentDisposition) { m_contentDisposition = contentDisposition; }
+
+    const BlobDataItemList& items() const { return m_items; }
+    void swapItems(BlobDataItemList&);
+    
+    void appendData(const CString&);
+    void appendFile(const String& path);
+    void appendFile(const String& path, long long offset, long long length, double expectedModificationTime);
+    void appendBlob(const KURL&, long long offset, long long length);
+
+private:
+    BlobData() { }
+
+    String m_contentType;
+    String m_contentDisposition;
+    BlobDataItemList m_items;
+};
+
+} // namespace WebCore
+
+#endif // BlobData_h