base: Move MemoryMappedFile out of file_util.h and into its own header file.

base/file_util_posix.cc

 // Copyright (c) 2012 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.
 
 #include "base/file_util.h"
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <fnmatch.h>
@@ skipping 841 matching lines @@
       }
       memset(&info.stat, 0, sizeof(info.stat));
     }
     entries->push_back(info);
   }
 
   closedir(dir);
   return true;
 }
 
-///////////////////////////////////////////////
-// MemoryMappedFile
-
-MemoryMappedFile::MemoryMappedFile()
-    : file_(base::kInvalidPlatformFileValue),
-      data_(NULL),
-      length_(0) {
-}
-
-bool MemoryMappedFile::MapFileToMemoryInternal() {
-  base::ThreadRestrictions::AssertIOAllowed();
-
-  struct stat file_stat;
-  if (fstat(file_, &file_stat) == base::kInvalidPlatformFileValue) {
-    DLOG(ERROR) << "Couldn't fstat " << file_ << ", errno " << errno;
-    return false;
-  }
-  length_ = file_stat.st_size;
-
-  data_ = static_cast<uint8*>(
-      mmap(NULL, length_, PROT_READ, MAP_SHARED, file_, 0));
-  if (data_ == MAP_FAILED)
-    DLOG(ERROR) << "Couldn't mmap " << file_ << ", errno " << errno;
-
-  return data_ != MAP_FAILED;
-}
-
-void MemoryMappedFile::CloseHandles() {
-  base::ThreadRestrictions::AssertIOAllowed();
-
-  if (data_ != NULL)
-    munmap(data_, length_);
-  if (file_ != base::kInvalidPlatformFileValue)
-    ignore_result(HANDLE_EINTR(close(file_)));
-
-  data_ = NULL;
-  length_ = 0;
-  file_ = base::kInvalidPlatformFileValue;
-}
-
 bool HasFileBeenModifiedSince(const FileEnumerator::FindInfo& find_info,
                               const base::Time& cutoff_time) {
   return static_cast<time_t>(find_info.stat.st_mtime) >= cutoff_time.ToTimeT();
 }
 
 bool NormalizeFilePath(const FilePath& path, FilePath* normalized_path) {
   FilePath real_path_result;
   if (!RealPath(path, &real_path_result))
     return false;
 
@@ skipping 219 matching lines @@
       kFileSystemRoot, path, kRootUid, allowed_group_ids);
 }
 #endif  // defined(OS_MACOSX) && !defined(OS_IOS)
 
 int GetMaximumPathComponentLength(const FilePath& path) {
   base::ThreadRestrictions::AssertIOAllowed();
   return pathconf(path.value().c_str(), _PC_NAME_MAX);
 }
 
 }  // namespace file_util