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 "ppapi/native_client/src/trusted/plugin/temporary_file.h"
6
7#include "native_client/src/include/portability_io.h"
8#include "native_client/src/shared/platform/nacl_check.h"
9#include "native_client/src/trusted/service_runtime/include/sys/stat.h"
10
11#include "ppapi/cpp/core.h"
12#include "ppapi/cpp/instance.h"
13#include "ppapi/cpp/module.h"
14#include "ppapi/c/private/pp_file_handle.h"
15
16#include "ppapi/native_client/src/trusted/plugin/plugin.h"
17#include "ppapi/native_client/src/trusted/plugin/utility.h"
18
19namespace plugin {
20
21TempFile::TempFile(Plugin* plugin, PP_FileHandle handle)
22    : plugin_(plugin),
23      internal_handle_(handle) { }
24
25TempFile::~TempFile() { }
26
27int32_t TempFile::Open(bool writeable) {
28  if (internal_handle_ == PP_kInvalidFileHandle)
29    return PP_ERROR_FAILED;
30
31#if NACL_WINDOWS
32  HANDLE handle = internal_handle_;
33
34  //////// Now try the posix view.
35  int rdwr_flag = writeable ? _O_RDWR : _O_RDONLY;
36  int32_t posix_desc = _open_osfhandle(reinterpret_cast<intptr_t>(handle),
37                                       rdwr_flag | _O_BINARY
38                                       | _O_TEMPORARY | _O_SHORT_LIVED );
39
40  // Close the Windows HANDLE if it can't be converted.
41  if (posix_desc == -1) {
42    PLUGIN_PRINTF(("TempFile::Open failed to convert HANDLE to posix\n"));
43    CloseHandle(handle);
44  }
45  int32_t fd = posix_desc;
46#else
47  int32_t fd = internal_handle_;
48#endif
49
50  if (fd < 0)
51    return PP_ERROR_FAILED;
52
53  // dup the fd to make allow making separate read and write wrappers.
54  int32_t read_fd = DUP(fd);
55  if (read_fd == NACL_NO_FILE_DESC)
56    return PP_ERROR_FAILED;
57
58  if (writeable) {
59    write_wrapper_.reset(
60        plugin_->wrapper_factory()->MakeFileDesc(fd, O_RDWR));
61  }
62
63  read_wrapper_.reset(
64      plugin_->wrapper_factory()->MakeFileDesc(read_fd, O_RDONLY));
65  return PP_OK;
66}
67
68bool TempFile::Reset() {
69  // Use the read_wrapper_ to reset the file pos.  The write_wrapper_ is also
70  // backed by the same file, so it should also reset.
71  CHECK(read_wrapper_.get() != NULL);
72  nacl_off64_t newpos = read_wrapper_->Seek(0, SEEK_SET);
73  return newpos == 0;
74}
75
76PP_FileHandle TempFile::TakeFileHandle() {
77  PP_FileHandle to_return = internal_handle_;
78  internal_handle_ = PP_kInvalidFileHandle;
79  read_wrapper_.release();
80  write_wrapper_.release();
81  return to_return;
82}
83
84}  // namespace plugin
85