C bindings: Implement _Validate(), and some pre-requisites

mojo/public/cpp/bindings/tests/validation_util.cc

+// Copyright 2016 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 "mojo/public/cpp/bindings/tests/validation_util.h"
+
+#include <stdio.h>
+
+#include "mojo/public/cpp/bindings/tests/validation_test_input_parser.h"
+#include "mojo/public/cpp/test_support/test_support.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace mojo {
+namespace test {
+namespace validation_util {
+
+std::string GetValidationDataPath(const std::string& root,
+                                  const std::string& suffix) {
+  return "mojo/public/interfaces/bindings/tests/data/validation/" + root +
+         suffix;
+}
+
+bool ReadFile(const std::string& path, std::string* result) {
+  FILE* fp = OpenSourceRootRelativeFile(path.c_str());
+  if (!fp) {
+    ADD_FAILURE() << "File not found: " << path;
+    return false;
+  }
+  fseek(fp, 0, SEEK_END);
+  size_t size = static_cast<size_t>(ftell(fp));
+  if (size == 0) {
+    result->clear();
+    fclose(fp);
+    return true;
+  }
+  fseek(fp, 0, SEEK_SET);
+  result->resize(size);
+  size_t size_read = fread(&result->at(0), 1, size, fp);
+  fclose(fp);
+  return size == size_read;
+}
+
+bool ReadAndParseDataFile(const std::string& path,
+                          std::vector<uint8_t>* data,
+                          size_t* num_handles) {
+  std::string input;
+  if (!ReadFile(path, &input))
+    return false;
+
+  std::string error_message;
+  if (!ParseValidationTestInput(input, data, num_handles, &error_message)) {
+    ADD_FAILURE() << error_message;
+    return false;
+  }
+
+  return true;
+}
+
+bool ReadResultFile(const std::string& path, std::string* result) {
+  if (!ReadFile(path, result))
+    return false;
+
+  // Result files are new-line delimited text files. Remove any CRs.
+  result->erase(std::remove(result->begin(), result->end(), '\r'),
+                result->end());
+
+  // Remove trailing LFs.
+  size_t pos = result->find_last_not_of('\n');
+  if (pos == std::string::npos)
+    result->clear();
+  else
+    result->resize(pos + 1);
+
+  return true;
+}
+
+bool ReadTestCase(const std::string& test_name,
+                  std::vector<uint8_t>* data,
+                  size_t* num_handles,
+                  std::string* expected) {
+  if (!ReadAndParseDataFile(GetValidationDataPath(test_name, ".data"), data,
+                            num_handles) ||
+      !ReadResultFile(GetValidationDataPath(test_name, ".expected"),
+                      expected)) {
+    return false;
+  }
+
+  return true;
+}
+
+std::vector<std::string> GetMatchingTests(const std::string& prefix) {
+  std::vector<std::string> names = EnumerateSourceRootRelativeDirectory(
+      validation_util::GetValidationDataPath("", ""));
+  const std::string suffix = ".data";
+  std::vector<std::string> tests;
+  for (size_t i = 0; i < names.size(); ++i) {
+    if (names[i].size() >= suffix.size() &&
+        names[i].substr(0, prefix.size()) == prefix &&
+        names[i].substr(names[i].size() - suffix.size()) == suffix)
+      tests.push_back(names[i].substr(0, names[i].size() - suffix.size()));
+  }
+  return tests;
+}
+
+}  // namespace validation_util
+}  // namespace test
+}  // namespace mojo