Validate MessageHeader before using

mojo/common/test/test_support_impl.cc

Index: mojo/common/test/test_support_impl.cc
diff --git a/mojo/common/test/test_support_impl.cc b/mojo/common/test/test_support_impl.cc
index 54c3376ef7dc0b9ea12bddfa77a49c9fd66a74fa..ce9e7ac5bbed1299fff606c144bb2c5751496a12 100644
--- a/mojo/common/test/test_support_impl.cc
+++ b/mojo/common/test/test_support_impl.cc
@@ -4,10 +4,38 @@
 
 #include "mojo/common/test/test_support_impl.h"
 
+#include <stdlib.h>
+#include <string.h>
+
+#include "base/file_util.h"
+#include "base/files/file_enumerator.h"
+#include "base/files/file_path.h"
+#include "base/path_service.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
 #include "base/test/perf_log.h"
 
 namespace mojo {
 namespace test {
+namespace {
+
+base::FilePath ResolveSourceRootRelativePath(const char* relative_path) {
+  base::FilePath path;
+  if (!PathService::Get(base::DIR_SOURCE_ROOT, &path))
+    return base::FilePath();
+
+  std::vector<std::string> components;
+  base::SplitString(relative_path, '/', &components);
+
+  for (size_t i = 0; i < components.size(); ++i) {
+    if (!components[i].empty())
+      path = path.AppendASCII(components[i]);
+  }
+
+  return path;
+}
+
+}  // namespace
 
 TestSupportImpl::TestSupportImpl() {
 }
@@ -21,5 +49,24 @@ void TestSupportImpl::LogPerfResult(const char* test_name,
   base::LogPerfResult(test_name, value, units);
 }
 
+FILE* TestSupportImpl::OpenSourceRootRelativeFile(const char* relative_path) {
+  return base::OpenFile(ResolveSourceRootRelativePath(relative_path), "rb");
+}
+
+char** TestSupportImpl::EnumerateSourceRootRelativeDirectory(
+    const char* relative_path) {
+  std::vector<std::string> names;
+  base::FileEnumerator e(ResolveSourceRootRelativePath(relative_path), false,
+                         base::FileEnumerator::FILES);
+  for (base::FilePath name = e.Next(); !name.empty(); name = e.Next())
+    names.push_back(name.BaseName().AsUTF8Unsafe());
+
+  // |names.size() + 1| for null terminator.
+  char** rv = static_cast<char**>(calloc(names.size() + 1, sizeof(char*)));
+  for (size_t i = 0; i < names.size(); ++i)
+    rv[i] = base::strdup(names[i].c_str());
+  return rv;
+}
+
 }  // namespace test
 }  // namespace mojo