components/nacl/renderer/plugin/temporary_file.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/nacl/renderer/plugin/temporary_file.h"
   6
   7 #include "components/nacl/renderer/plugin/plugin.h"
   8 #include "components/nacl/renderer/plugin/utility.h"
   9 #include "native_client/src/include/portability_io.h"
  10 #include "native_client/src/shared/platform/nacl_check.h"
  11 #include "native_client/src/trusted/service_runtime/include/sys/stat.h"
  12 #include "ppapi/c/private/pp_file_handle.h"
  13 #include "ppapi/cpp/core.h"
  14 #include "ppapi/cpp/instance.h"
  15 #include "ppapi/cpp/module.h"
  16
  17 namespace plugin {
  18
  19 TempFile::TempFile(Plugin* plugin, PP_FileHandle handle)
  20     : plugin_(plugin),
  21       internal_handle_(handle) { }
  22
  23 TempFile::~TempFile() { }
  24
  25 int32_t TempFile::Open(bool writeable) {
  26   if (internal_handle_ == PP_kInvalidFileHandle)
  27     return PP_ERROR_FAILED;
  28
  29 #if NACL_WINDOWS
  30   HANDLE handle = internal_handle_;
  31
  32   //////// Now try the posix view.
  33   int rdwr_flag = writeable ? _O_RDWR : _O_RDONLY;
  34   int32_t posix_desc = _open_osfhandle(reinterpret_cast<intptr_t>(handle),
  35                                        rdwr_flag | _O_BINARY
  36                                        | _O_TEMPORARY | _O_SHORT_LIVED );
  37
  38   // Close the Windows HANDLE if it can't be converted.
  39   if (posix_desc == -1) {
  40     PLUGIN_PRINTF(("TempFile::Open failed to convert HANDLE to posix\n"));
  41     CloseHandle(handle);
  42   }
  43   int32_t fd = posix_desc;
  44 #else
  45   int32_t fd = internal_handle_;
  46 #endif
  47
  48   if (fd < 0)
  49     return PP_ERROR_FAILED;
  50
  51   // dup the fd to make allow making separate read and write wrappers.
  52   int32_t read_fd = DUP(fd);
  53   if (read_fd == NACL_NO_FILE_DESC)
  54     return PP_ERROR_FAILED;
  55
  56   if (writeable) {
  57     write_wrapper_.reset(
  58         plugin_->wrapper_factory()->MakeFileDesc(fd, O_RDWR));
  59   }
  60
  61   read_wrapper_.reset(
  62       plugin_->wrapper_factory()->MakeFileDesc(read_fd, O_RDONLY));
  63   return PP_OK;
  64 }
  65
  66 bool TempFile::Reset() {
  67   // Use the read_wrapper_ to reset the file pos.  The write_wrapper_ is also
  68   // backed by the same file, so it should also reset.
  69   CHECK(read_wrapper_.get() != NULL);
  70   nacl_off64_t newpos = read_wrapper_->Seek(0, SEEK_SET);
  71   return newpos == 0;
  72 }
  73
  74 PP_FileHandle TempFile::TakeFileHandle() {
  75   PP_FileHandle to_return = internal_handle_;
  76   internal_handle_ = PP_kInvalidFileHandle;
  77   read_wrapper_.release();
  78   write_wrapper_.release();
  79   return to_return;
  80 }
  81
  82 }  // namespace plugin