Validate MessageHeader before using

mojo/public/c/test_support/test_support.h

Index: mojo/public/c/test_support/test_support.h
diff --git a/mojo/public/c/test_support/test_support.h b/mojo/public/c/test_support/test_support.h
index f85464740222dc44322554f71a52c4f04c26f138..e880848461ebdd7b2c34e31edf453c0d78885d5e 100644
--- a/mojo/public/c/test_support/test_support.h
+++ b/mojo/public/c/test_support/test_support.h
@@ -7,6 +7,8 @@
 
 // Note: This header should be compilable as C.
 
+#include <stdio.h>
+
 #include "mojo/public/c/test_support/test_support_export.h"
 
 #ifdef __cplusplus
@@ -18,6 +20,27 @@ MOJO_TEST_SUPPORT_EXPORT void MojoTestSupportLogPerfResult(
     double value,
     const char* units);
 
+// Opens a "/"-delimited file path relative to the source root.
+MOJO_TEST_SUPPORT_EXPORT FILE* MojoTestSupportOpenSourceRootRelativeFile(
+    const char* source_root_relative_path);
+
+// Enumerates a "/"-delimited directory path relative to the source root.
+// Returns only regular files. The return value is a heap-allocated array of
+// heap-allocated strings. Each much be free'd separately.

[yzshen1, 2014/04/27 22:49:38]

nit: much -> must

[darin (slow to review), 2014/04/29 06:31:45]

Done.

+//
+// The return value is built like so:
+//
+//   char** rv = (char**) calloc(N, sizeof(char*));

[yzshen1, 2014/04/27 22:49:38]

nit: should be N+1.

[darin (slow to review), 2014/04/29 06:31:45]

Done.

+//   rv[0] = strdup("a");
+//   rv[1] = strdup("b");
+//   rv[2] = strdup("c");
+//   ...
+//   rv[N] = NULL;
+//
+MOJO_TEST_SUPPORT_EXPORT
+char** MojoTestSupportEnumerateSourceRootRelativeDirectory(
+    const char* source_root_relative_path);
+
 #ifdef __cplusplus
 }  // extern "C"
 #endif