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

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

 // Copyright (c) 2013 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.
 
 // Some common file utilities for plugin code.
 
 #include "ppapi/native_client/src/trusted/plugin/file_utils.h"
 
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 
 #include <sys/stat.h>
 #include <sys/types.h>
 
 #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 {
 namespace file_utils {
 
 StatusCode SlurpFile(int32_t fd,
                      nacl::string& out_buf,
                      size_t max_size_to_read) {
   struct stat stat_buf;
   if (fstat(fd, &stat_buf) != 0) {
@@ skipping 36 matching lines @@
     total_bytes_read += bytes_this_read;
     bytes_to_read -= bytes_this_read;
   }
 
   fclose(input_file);
   buffer[total_bytes_read] = '\0';
   out_buf = buffer.get();
   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
-