Change command buffer client code to use structures....

command_buffer/service/cross/cmd_parser.cc

 /*
  * 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.
@@ skipping 48 matching lines @@
 
 // Process one command, reading the header from the command buffer, and
 // forwarding the command index and the arguments to the handler.
 // Note that:
 // - validation needs to happen on a copy of the data (to avoid race
 // conditions). This function only validates the header, leaving the arguments
 // validation to the handler, so it can pass a reference to them.
 // - get_ is modified *after* the command has been executed.
 BufferSyncInterface::ParseError CommandParser::ProcessCommand() {
   CommandBufferOffset get = get_;
-  if (get == put_) return BufferSyncInterface::PARSE_NO_ERROR;
+  if (get == put_) return BufferSyncInterface::kParseNoError;
 
   CommandHeader header = buffer_[get].value_header;
-  if (header.size == 0) return BufferSyncInterface::PARSE_INVALID_SIZE;
+  if (header.size == 0) return BufferSyncInterface::kParseInvalidSize;
   if (header.size + get > entry_count_)
-    return BufferSyncInterface::PARSE_OUT_OF_BOUNDS;
+    return BufferSyncInterface::kParseOutOfBounds;
   BufferSyncInterface::ParseError result = handler_->DoCommand(
-      header.command, header.size - 1, buffer_ + get + 1);
+      header.command, header.size - 1, buffer_ + get);
   get_ = (get + header.size) % entry_count_;
   return result;
 }
 
 // Processes all the commands, while the buffer is not empty. Stop if an error
 // is encountered.
 BufferSyncInterface::ParseError CommandParser::ProcessAllCommands() {
   while (!IsEmpty()) {
     BufferSyncInterface::ParseError error = ProcessCommand();
     if (error) return error;
   }
-  return BufferSyncInterface::PARSE_NO_ERROR;
+  return BufferSyncInterface::kParseNoError;
 }
 
 }  // namespace command_buffer
 }  // namespace o3d