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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 contains the command parser class.
+
+#ifndef GPU_COMMAND_BUFFER_SERVICE_CROSS_CMD_PARSER_H_
+#define GPU_COMMAND_BUFFER_SERVICE_CROSS_CMD_PARSER_H_
+
+#include "command_buffer/common/constants.h"
+#include "command_buffer/common/cmd_buffer_common.h"
+
+namespace command_buffer {
+
+class AsyncAPIInterface;
+
+// Command parser class. This class parses commands from a shared memory
+// buffer, to implement some asynchronous RPC mechanism.
+class CommandParser {
+ public:
+  CommandParser(void *shm_address,
+                size_t shm_size,
+                ptrdiff_t offset,
+                size_t size,
+                CommandBufferOffset start_get,
+                AsyncAPIInterface *handler);
+
+  // Gets the "get" pointer. The get pointer is an index into the command
+  // buffer considered as an array of CommandBufferEntry.
+  CommandBufferOffset get() const { return get_; }
+
+  // Sets the "put" pointer. The put pointer is an index into the command
+  // buffer considered as an array of CommandBufferEntry.
+  void set_put(CommandBufferOffset put) { put_ = put; }
+
+  // Gets the "put" pointer. The put pointer is an index into the command
+  // buffer considered as an array of CommandBufferEntry.
+  CommandBufferOffset put() const { return put_; }
+
+  // Checks whether there are commands to process.
+  bool IsEmpty() const { return put_ == get_; }
+
+  // Processes one command, updating the get pointer. This will return an error
+  // if there are no commands in the buffer.
+  parse_error::ParseError ProcessCommand();
+
+  // Processes all commands until get == put.
+  parse_error::ParseError ProcessAllCommands();
+
+  // Reports an error.
+  void ReportError(unsigned int command_id, parse_error::ParseError result);
+
+ private:
+  CommandBufferOffset get_;
+  CommandBufferOffset put_;
+  CommandBufferEntry *buffer_;
+  size_t entry_count_;
+  AsyncAPIInterface *handler_;
+};
+
+// This class defines the interface for an asynchronous API handler, that
+// is responsible for de-multiplexing commands and their arguments.
+class AsyncAPIInterface {
+ public:
+  AsyncAPIInterface() {}
+  virtual ~AsyncAPIInterface() {}
+
+  // Executes a command.
+  // Parameters:
+  //    command: the command index.
+  //    arg_count: the number of CommandBufferEntry arguments.
+  //    cmd_data: the command data.
+  // Returns:
+  //   parse_error::NO_ERROR if no error was found, one of
+  //   parse_error::ParseError otherwise.
+  virtual parse_error::ParseError DoCommand(
+      unsigned int command,
+      unsigned int arg_count,
+      const void* cmd_data) = 0;
+
+  // Returns a name for a command. Useful for logging / debuging.
+  virtual const char* GetCommandName(unsigned int command_id) const = 0;
+};
+
+}  // namespace command_buffer
+
+#endif  // GPU_COMMAND_BUFFER_SERVICE_CROSS_CMD_PARSER_H_