Enable mmap and identity-based validation caching on pnacl-{llc,ld}.nexe

ppapi/native_client/src/trusted/plugin/file_utils.cc

Index: ppapi/native_client/src/trusted/plugin/file_utils.cc
diff --git a/ppapi/native_client/src/trusted/plugin/file_utils.cc b/ppapi/native_client/src/trusted/plugin/file_utils.cc
index d83432785b2ac433404ec4ae8d35104eac3a6264..639c3e49b186f9b1a13a900d614f6650eefc435d 100644
--- a/ppapi/native_client/src/trusted/plugin/file_utils.cc
+++ b/ppapi/native_client/src/trusted/plugin/file_utils.cc
@@ -16,6 +16,7 @@
 #include "native_client/src/include/nacl_scoped_ptr.h"
 #include "native_client/src/include/portability_io.h"
 #include "native_client/src/include/portability_string.h"
+#include "ppapi/native_client/src/trusted/plugin/utility.h"
 
 
 namespace plugin {
@@ -72,6 +73,25 @@ StatusCode SlurpFile(int32_t fd,
   return PLUGIN_FILE_SUCCESS;
 }
 
+// Converts a PP_FileHandle to a POSIX file descriptor.
+int32_t ConvertFileDescriptor(PP_FileHandle handle) {
+  PLUGIN_PRINTF(("ConvertFileDescriptor, handle=%d\n", handle));
+#if NACL_WINDOWS
+  int32_t file_desc = NACL_NO_FILE_DESC;
+  // On Windows, valid handles are 32 bit unsigned integers so this is safe.
+  file_desc = reinterpret_cast<uintptr_t>(handle);
+  // Convert the Windows HANDLE from Pepper to a POSIX file descriptor.
+  int32_t posix_desc = _open_osfhandle(file_desc, _O_RDWR | _O_BINARY);
+  if (posix_desc == -1) {
+    // Close the Windows HANDLE if it can't be converted.
+    CloseHandle(reinterpret_cast<HANDLE>(file_desc));
+    return -1;
+  }
+  return posix_desc;
+#else
+  return handle;
+#endif
+}
+
 }  // namespace file_utils
 }  // namespace plugin
-