diff -r 000000000000 -r 4f2f89ce4247 WebCore/html/Blob.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/html/Blob.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,102 @@
+/*
+ * 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.
+ */
+
+#include "config.h"
+#include "Blob.h"
+
+#include "BlobItem.h"
+#include "FileSystem.h"
+
+namespace WebCore {
+
+Blob::Blob(const String& type, const BlobItemList& items)
+    : m_type(type)
+{
+    for (size_t i = 0; i < items.size(); ++i)
+        m_items.append(items[i]);
+}
+
+Blob::Blob(const PassRefPtr<BlobItem>& item)
+{
+    m_items.append(item);
+}
+
+Blob::Blob(const String& path)
+{
+    // Note: this doesn't initialize the type unlike File(path).
+    m_items.append(FileBlobItem::create(path));
+}
+
+unsigned long long Blob::size() const
+{
+    // FIXME: JavaScript cannot represent sizes as large as unsigned long long, we need to
+    // come up with an exception to throw if file size is not represetable.
+    unsigned long long size = 0;
+    for (size_t i = 0; i < m_items.size(); ++i)
+        size += m_items[i]->size();
+    return size;
+}
+
+const String& Blob::path() const
+{
+    ASSERT(m_items.size() == 1 && m_items[0]->toFileBlobItem());
+    return m_items[0]->toFileBlobItem()->path();
+}
+
+#if ENABLE(BLOB_SLICE)
+PassRefPtr<Blob> Blob::slice(long long start, long long length, const String& contentType) const
+{
+    if (start < 0)
+        start = 0;
+    if (length < 0)
+        length = 0;
+
+    // Clamp the range if it exceeds the size limit.
+    unsigned long long totalSize = size();
+    if (static_cast<unsigned long long>(start) > totalSize) {
+        start = 0;
+        length = 0;
+    } else if (static_cast<unsigned long long>(start + length) > totalSize)
+        length = totalSize - start;
+
+    size_t i = 0;
+    BlobItemList items;
+    for (; i < m_items.size() && static_cast<unsigned long long>(start) >= m_items[i]->size(); ++i)
+        start -= m_items[i]->size();
+    for (; length > 0 && i < m_items.size(); ++i) {
+        items.append(m_items[i]->slice(start, length));
+        length -= items.last()->size();
+        start = 0;
+    }
+    return Blob::create(contentType, items);
+}
+#endif // ENABLE(BLOB_SLICE)
+
+} // namespace WebCore