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diff --git a/o3d/plugin/cross/config.h b/o3d/plugin/cross/config.h
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+/*
+ * Copyright 2009, 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.
+ */
+
+
+// This file defines a few functions to check the user's hardware and software
+// configuration.
+
+#ifndef O3D_PLUGIN_CROSS_CONFIG_H_
+#define O3D_PLUGIN_CROSS_CONFIG_H_
+
+#include <fstream>
+#include <string>
+#include "plugin/cross/o3d_glue.h"
+
+// Returns the user agent string.
+// Arguments:
+//   npp: plugin instance.
+// Returns:
+//   The user agent string.
+std::string GetUserAgent(NPP npp);
+
+struct GPUDevice {
+  unsigned int vendor_id;
+  unsigned int device_id;
+  std::string driver;
+  std::string description;
+  std::string name;
+  unsigned int guid;
+};
+
+// Asks the user to ok a continuation
+// Arguments:
+//   npp: plugin instance.
+//   error: the error to signal.
+// Returns:
+//   true if the error was overridden by the user, false otherwise.
+bool AskUser(NPP npp, const std::string &error);
+
+// Gets the device information.
+// Arguments:
+//   device: a GPUDevice structure that will contain the vendor and device IDs.
+//   name: a pointer to a string that will contain the device string.
+// Returns:
+//   true if successful. If not, device and name are not modified.
+bool GetGPUDevice(NPP npp, GPUDevice *device);
+
+// Checks that the current hardware and software configuration is supported,
+// prompting the user to give him and option to run anyway.
+// Arguments:
+//   npp: plugin instance.
+// Returns:
+//   Whether to allow the plug-in to run.
+bool CheckConfig(NPP npp);
+
+// The following functions are platform-dependent, and are implemented in the
+// respective {platform}/config.cc files
+
+// Checks the operating system version.
+bool CheckOSVersion(NPP npp);
+
+// Checks the user agent string.
+bool CheckUserAgent(NPP npp, const std::string &user_agent);
+
+// Used to get the text file that lists blacklisted driver GUIDs.
+// Returns true on success.
+bool OpenDriverBlacklistFile(std::ifstream *input_file);
+
+// Checks the driver GUID against the blacklist file.  Returns true if there's a
+// match [this driver is blacklisted] or if an IO error occurred.  Check the
+// state of input_file to determine which it was.
+// Note that this function always returns false if the guid is 0, since it will
+// be 0 if we had a failure in reading it, and the user will already have been
+// warned.
+bool IsDriverBlacklisted(std::ifstream *input_file, unsigned int guid);
+
+// Checks the current hardware, software configurations and puts the values
+// into metrics.
+bool GetUserConfigMetrics();
+
+// Checks the browser version.
+// Arguments:
+//   npp: plugin instance.
+bool GetUserAgentMetrics(NPP npp);
+
+bool GetOpenGLMetrics();
+
+#endif  // O3D_PLUGIN_CROSS_CONFIG_H_