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diff --git a/test/packetdrill/parse.h b/test/packetdrill/parse.h
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+/*
+ * Copyright 2013 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+/*
+ * Author: ncardwell@google.com (Neal Cardwell)
+ *
+ * Interface for a module to parse test scripts.
+ */
+
+#ifndef __PARSER_H__
+#define __PARSER_H__
+
+#include "types.h"
+
+#include "assert.h"
+#include "config.h"
+#include "script.h"
+
+/* Copy the script contents into our single linear buffer. */
+extern void copy_script(const char *script_buffer,
+			struct script *script);
+
+/* Read the script file into a single linear buffer. */
+extern void read_script(const char *script_path,
+			struct script *script);
+
+/* The public, top-level call to parse a test script. It first parses the
+ * internal linear script buffer and then fills in the
+ * 'script' object with the internal representation of the
+ * script. Uses the given 'config' object to look up configuration
+ * info needed during parsing (such as whether packets are IPv4 or
+ * IPv6). Passes the given 'callback_invocation' when calling back to
+ * parse_and_finalize_config() after parsing all in-script
+ * options.
+ *
+ * Returns STATUS_OK on success; on failure returns STATUS_ERR. The
+ * implementation for this function is in the bison parser file
+ * parser.y.
+ */
+extern int parse_script(struct config *config,
+			struct script *script,
+			struct invocation *callback_invocation);
+
+/* Config for lexing and parsing. */
+extern struct config *in_config;
+
+#endif /* __PARSER_H__ */