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/files/file_tracing.h"
   8 #include "base/metrics/histogram.h"
   9 #include "base/timer/elapsed_timer.h"
  10
  11 namespace base {
  12
  13 File::Info::Info()
  14     : size(0),
  15       is_directory(false),
  16       is_symbolic_link(false) {
  17 }
  18
  19 File::Info::~Info() {
  20 }
  21
  22 File::File()
  23     : error_details_(FILE_ERROR_FAILED),
  24       created_(false),
  25       async_(false) {
  26 }
  27
  28 #if !defined(OS_NACL)
  29 File::File(const FilePath& path, uint32 flags)
  30     : error_details_(FILE_OK),
  31       created_(false),
  32       async_(false) {
  33   Initialize(path, flags);
  34 }
  35 #endif
  36
  37 File::File(PlatformFile platform_file)
  38     : file_(platform_file),
  39       error_details_(FILE_OK),
  40       created_(false),
  41       async_(false) {
  42 #if defined(OS_POSIX)
  43   DCHECK_GE(platform_file, -1);
  44 #endif
  45 }
  46
  47 File::File(Error error_details)
  48     : error_details_(error_details),
  49       created_(false),
  50       async_(false) {
  51 }
  52
  53 File::File(RValue other)
  54     : file_(other.object->TakePlatformFile()),
  55       tracing_path_(other.object->tracing_path_),
  56       error_details_(other.object->error_details()),
  57       created_(other.object->created()),
  58       async_(other.object->async_) {
  59 }
  60
  61 File::~File() {
  62   // Go through the AssertIOAllowed logic.
  63   Close();
  64 }
  65
  66 // static
  67 File File::CreateForAsyncHandle(PlatformFile platform_file) {
  68   File file(platform_file);
  69   // It would be nice if we could validate that |platform_file| was opened with
  70   // FILE_FLAG_OVERLAPPED on Windows but this doesn't appear to be possible.
  71   file.async_ = true;
  72   return file.Pass();
  73 }
  74
  75 File& File::operator=(RValue other) {
  76   if (this != other.object) {
  77     Close();
  78     SetPlatformFile(other.object->TakePlatformFile());
  79     tracing_path_ = other.object->tracing_path_;
  80     error_details_ = other.object->error_details();
  81     created_ = other.object->created();
  82     async_ = other.object->async_;
  83   }
  84   return *this;
  85 }
  86
  87 #if !defined(OS_NACL)
  88 void File::Initialize(const FilePath& path, uint32 flags) {
  89   if (path.ReferencesParent()) {
  90     error_details_ = FILE_ERROR_ACCESS_DENIED;
  91     return;
  92   }
  93   if (FileTracing::IsCategoryEnabled())
  94     tracing_path_ = path;
  95   SCOPED_FILE_TRACE("Initialize");
  96   DoInitialize(path, flags);
  97 }
  98 #endif
  99
 100 std::string File::ErrorToString(Error error) {
 101   switch (error) {
 102     case FILE_OK:
 103       return "FILE_OK";
 104     case FILE_ERROR_FAILED:
 105       return "FILE_ERROR_FAILED";
 106     case FILE_ERROR_IN_USE:
 107       return "FILE_ERROR_IN_USE";
 108     case FILE_ERROR_EXISTS:
 109       return "FILE_ERROR_EXISTS";
 110     case FILE_ERROR_NOT_FOUND:
 111       return "FILE_ERROR_NOT_FOUND";
 112     case FILE_ERROR_ACCESS_DENIED:
 113       return "FILE_ERROR_ACCESS_DENIED";
 114     case FILE_ERROR_TOO_MANY_OPENED:
 115       return "FILE_ERROR_TOO_MANY_OPENED";
 116     case FILE_ERROR_NO_MEMORY:
 117       return "FILE_ERROR_NO_MEMORY";
 118     case FILE_ERROR_NO_SPACE:
 119       return "FILE_ERROR_NO_SPACE";
 120     case FILE_ERROR_NOT_A_DIRECTORY:
 121       return "FILE_ERROR_NOT_A_DIRECTORY";
 122     case FILE_ERROR_INVALID_OPERATION:
 123       return "FILE_ERROR_INVALID_OPERATION";
 124     case FILE_ERROR_SECURITY:
 125       return "FILE_ERROR_SECURITY";
 126     case FILE_ERROR_ABORT:
 127       return "FILE_ERROR_ABORT";
 128     case FILE_ERROR_NOT_A_FILE:
 129       return "FILE_ERROR_NOT_A_FILE";
 130     case FILE_ERROR_NOT_EMPTY:
 131       return "FILE_ERROR_NOT_EMPTY";
 132     case FILE_ERROR_INVALID_URL:
 133       return "FILE_ERROR_INVALID_URL";
 134     case FILE_ERROR_IO:
 135       return "FILE_ERROR_IO";
 136     case FILE_ERROR_MAX:
 137       break;
 138   }
 139
 140   NOTREACHED();
 141   return "";
 142 }
 143
 144 bool File::Flush() {
 145   ElapsedTimer timer;
 146   SCOPED_FILE_TRACE("Flush");
 147   bool return_value = DoFlush();
 148   UMA_HISTOGRAM_TIMES("PlatformFile.FlushTime", timer.Elapsed());
 149   return return_value;
 150 }
 151
 152 }  // namespace base