Provide metadata to validator to allow faster caching.

src/trusted/validator/validation_metadata.h

+/*
+ * Copyright (c) 2013 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_VALIDATION_METADATA_H__
+#define NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_VALIDATION_METADATA_H__
+
+#include <stddef.h>
+#include <time.h>
+
+#include "native_client/src/include/nacl_base.h"
+
+EXTERN_C_BEGIN
+
+/*
+ * Note: this values in this enum are written to the cache, so changing them
+ * will implicitly invalidate cache entries.
+ */
+typedef enum NaClCodeIdentityType {
+  NaClCodeIdentityData = 0,
+  NaClCodeIdentityFile = 1,
+  NaClCodeIdentityMax
+} NaClCodeIdentityType;
+
+struct NaClValidationMetadata {
+  NaClCodeIdentityType identity_type;
+  int64_t code_offset;
+  const char* file_name;
+  size_t file_name_length;
+  int64_t file_size;
+  time_t mtime;
+};
+
+EXTERN_C_END
+
+#endif /* NATIVE_CLIENT_SRC_TRUSTED_VALIDATOR_VALIDATION_METADATA_H__ */