base/files/file.cc

   1 // Copyright (c) 2011 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 "base/files/file.h"
   6 #include "base/files/file_path.h"
   7 #include "base/metrics/histogram.h"
   8 #include "base/timer/elapsed_timer.h"
   9
  10 #if defined(OS_POSIX)
  11 #include "base/files/file_posix_hooks_internal.h"
  12 #endif
  13
  14 namespace base {
  15
  16 File::Info::Info()
  17     : size(0),
  18       is_directory(false),
  19       is_symbolic_link(false) {
  20 }
  21
  22 File::Info::~Info() {
  23 }
  24
  25 File::File()
  26     : error_details_(FILE_ERROR_FAILED),
  27       created_(false),
  28       async_(false) {
  29 }
  30
  31 #if !defined(OS_NACL)
  32 File::File(const FilePath& name, uint32 flags)
  33     : error_details_(FILE_OK),
  34       created_(false),
  35       async_(false) {
  36   Initialize(name, flags);
  37 }
  38 #endif
  39
  40 File::File(PlatformFile platform_file)
  41     : file_(platform_file),
  42       error_details_(FILE_OK),
  43       created_(false),
  44       async_(false) {
  45 #if defined(OS_POSIX)
  46   DCHECK_GE(platform_file, -1);
  47   if (IsValid())
  48     ProtectFileDescriptor(platform_file);
  49 #endif
  50 }
  51
  52 File::File(Error error_details)
  53     : error_details_(error_details),
  54       created_(false),
  55       async_(false) {
  56 }
  57
  58 File::File(RValue other)
  59     : file_(other.object->TakePlatformFile()),
  60       error_details_(other.object->error_details()),
  61       created_(other.object->created()),
  62       async_(other.object->async_) {
  63 #if defined(OS_POSIX)
  64    if (IsValid())
  65      ProtectFileDescriptor(GetPlatformFile());
  66 #endif
  67 }
  68
  69 File::~File() {
  70   // Go through the AssertIOAllowed logic.
  71   Close();
  72 }
  73
  74 File& File::operator=(RValue other) {
  75   if (this != other.object) {
  76     Close();
  77     SetPlatformFile(other.object->TakePlatformFile());
  78     error_details_ = other.object->error_details();
  79     created_ = other.object->created();
  80     async_ = other.object->async_;
  81   }
  82   return *this;
  83 }
  84
  85 #if !defined(OS_NACL)
  86 void File::Initialize(const FilePath& name, uint32 flags) {
  87   if (name.ReferencesParent()) {
  88     error_details_ = FILE_ERROR_ACCESS_DENIED;
  89     return;
  90   }
  91   InitializeUnsafe(name, flags);
  92 }
  93 #endif
  94
  95 std::string File::ErrorToString(Error error) {
  96   switch (error) {
  97     case FILE_OK:
  98       return "FILE_OK";
  99     case FILE_ERROR_FAILED:
 100       return "FILE_ERROR_FAILED";
 101     case FILE_ERROR_IN_USE:
 102       return "FILE_ERROR_IN_USE";
 103     case FILE_ERROR_EXISTS:
 104       return "FILE_ERROR_EXISTS";
 105     case FILE_ERROR_NOT_FOUND:
 106       return "FILE_ERROR_NOT_FOUND";
 107     case FILE_ERROR_ACCESS_DENIED:
 108       return "FILE_ERROR_ACCESS_DENIED";
 109     case FILE_ERROR_TOO_MANY_OPENED:
 110       return "FILE_ERROR_TOO_MANY_OPENED";
 111     case FILE_ERROR_NO_MEMORY:
 112       return "FILE_ERROR_NO_MEMORY";
 113     case FILE_ERROR_NO_SPACE:
 114       return "FILE_ERROR_NO_SPACE";
 115     case FILE_ERROR_NOT_A_DIRECTORY:
 116       return "FILE_ERROR_NOT_A_DIRECTORY";
 117     case FILE_ERROR_INVALID_OPERATION:
 118       return "FILE_ERROR_INVALID_OPERATION";
 119     case FILE_ERROR_SECURITY:
 120       return "FILE_ERROR_SECURITY";
 121     case FILE_ERROR_ABORT:
 122       return "FILE_ERROR_ABORT";
 123     case FILE_ERROR_NOT_A_FILE:
 124       return "FILE_ERROR_NOT_A_FILE";
 125     case FILE_ERROR_NOT_EMPTY:
 126       return "FILE_ERROR_NOT_EMPTY";
 127     case FILE_ERROR_INVALID_URL:
 128       return "FILE_ERROR_INVALID_URL";
 129     case FILE_ERROR_IO:
 130       return "FILE_ERROR_IO";
 131     case FILE_ERROR_MAX:
 132       break;
 133   }
 134
 135   NOTREACHED();
 136   return "";
 137 }
 138
 139 bool File::Flush() {
 140   ElapsedTimer timer;
 141   bool return_value = DoFlush();
 142   UMA_HISTOGRAM_TIMES("PlatformFile.FlushTime", timer.Elapsed());
 143   return return_value;
 144 }
 145
 146 }  // namespace base