1 files changed, 105 insertions, 0 deletions
diff --git a/Source/WebKit2/Shared/ShareableResource.cpp b/Source/WebKit2/Shared/ShareableResource.cpp
new file mode 100644
index 000000000..bd98629a2
--- /dev/null
+++ b/Source/WebKit2/Shared/ShareableResource.cpp
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2012 Apple 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 INC. AND ITS 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 APPLE INC. OR ITS 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 "ShareableResource.h"
+
+#include "ArgumentCoders.h"
+
+namespace WebKit {
+
+ShareableResource::Handle::Handle()
+{
+}
+
+void ShareableResource::Handle::encode(CoreIPC::ArgumentEncoder& encoder) const
+{
+    encoder << m_handle;
+    encoder << m_offset;
+    encoder << m_size;
+}
+
+bool ShareableResource::Handle::decode(CoreIPC::ArgumentDecoder* decoder, Handle& handle)
+{
+    if (!decoder->decode(handle.m_handle))
+        return false;
+    if (!decoder->decode(handle.m_offset))
+        return false;
+    if (!decoder->decode(handle.m_size))
+        return false;
+    return true;
+}
+    
+PassRefPtr<ShareableResource> ShareableResource::create(PassRefPtr<SharedMemory> sharedMemory, unsigned offset, unsigned size)
+{
+    return adoptRef(new ShareableResource(sharedMemory, offset, size));
+}
+
+PassRefPtr<ShareableResource> ShareableResource::create(const Handle& handle)
+{
+    RefPtr<SharedMemory> sharedMemory = SharedMemory::create(handle.m_handle, SharedMemory::ReadOnly);
+    if (!sharedMemory)
+        return 0;
+
+    return create(sharedMemory.release(), handle.m_offset, handle.m_size);
+}
+
+ShareableResource::ShareableResource(PassRefPtr<SharedMemory> sharedMemory, unsigned offset, unsigned size)
+    : m_sharedMemory(sharedMemory)
+    , m_offset(offset)
+    , m_size(size)
+{
+    ASSERT(m_sharedMemory);
+    ASSERT(m_offset + m_size <= m_sharedMemory->size());
+    
+    // FIXME (NetworkProcess): This data was received from another process.  If it is bogus, should we assume that process is compromised and we should kill it?
+}
+
+ShareableResource::~ShareableResource()
+{
+}
+
+bool ShareableResource::createHandle(Handle& handle)
+{
+    if (!m_sharedMemory->createHandle(handle.m_handle, SharedMemory::ReadOnly))
+        return false;
+
+    handle.m_offset = m_offset;
+    handle.m_size = m_size;
+
+    return true;
+}
+
+const char* ShareableResource::data() const
+{
+    return static_cast<const char*>(m_sharedMemory->data()) + m_offset;
+}
+
+unsigned ShareableResource::size() const
+{
+    return m_size;
+}
+    
+} // namespace WebKit