Initial implementation of IRT for non-SFI mode.

components/nacl/loader/nonsfi/irt_interfaces.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/nacl/loader/nonsfi/irt_interfaces.h"
+
+#include <cstring>
+
+namespace nacl {
+namespace nonsfi {
+
+namespace {
+
+// This table keeps a pair of IRT entry (such as nacl_irt_basic, nacl_irt_fdio
+// etc.) and its registered name with its version (such as NACL_IRT_BASIC_v0_1,
+// NACL_IRT_FDIO_v0_1, etc.).
+struct NaClInterfaceTable {
+  const char* name;
+  const void* table;
+  size_t size;
+};
+
+#define NACL_INTERFACE_TABLE(name, value) { name, &value, sizeof(value) }
+const NaClInterfaceTable kIrtInterfaces[] = {
+  NACL_INTERFACE_TABLE(NACL_IRT_BASIC_v0_1, kIrtBasic),
+};
+#undef NACL_INTERFACE_TABLE
+
+}  // namespace
+
+size_t NaClIrtInterface(const char* interface_ident,
+                        void* table, size_t tablesize) {
+  for (size_t i = 0; i < arraysize(kIrtInterfaces); ++i) {
+    if (std::strcmp(interface_ident, kIrtInterfaces[i].name) == 0) {
+      const size_t size = kIrtInterfaces[i].size;
+      if (size <= tablesize) {
+        std::memcpy(table, kIrtInterfaces[i].table, size);
+        return size;
+      }
+      break;
+    }
+  }
+  return 0;
+}
+
+}  // namespace nonsfi
+}  // namespace nacl