[Media Gallery] Added code to support mtp device media file system on Windows.

webkit/fileapi/file_system_file_util.h

Index: webkit/fileapi/file_system_file_util.h
diff --git a/webkit/fileapi/file_system_file_util.h b/webkit/fileapi/file_system_file_util.h
index bab08812f68f2c2da8f17b7ce4050a5a522947d7..aabea94daed76a1707635990d062639edee90601 100644
--- a/webkit/fileapi/file_system_file_util.h
+++ b/webkit/fileapi/file_system_file_util.h
@@ -1,211 +1,212 @@
-// 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.
-
-#ifndef WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
-#define WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
-
-#include "base/file_path.h"
-#include "base/file_util_proxy.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/platform_file.h"
-#include "webkit/fileapi/file_system_url.h"
-#include "webkit/storage/webkit_storage_export.h"
-
-namespace base {
-class Time;
-}
-
-namespace webkit_blob {
-class ShareableFileReference;
-}
-
-namespace fileapi {
-
-using base::PlatformFile;
-using base::PlatformFileError;
-class FileSystemOperationContext;
-
-// A file utility interface that provides basic file utility methods for
-// FileSystem API.
-//
-// Layering structure of the FileSystemFileUtil was split out.
-// See http://crbug.com/128136 if you need it.
-class WEBKIT_STORAGE_EXPORT FileSystemFileUtil {
- public:
-  // It will be implemented by each subclass such as FileSystemFileEnumerator.
-  class AbstractFileEnumerator {
-   public:
-    virtual ~AbstractFileEnumerator() {}
-
-    // Returns an empty string if there are no more results.
-    virtual FilePath Next() = 0;
-
-    virtual int64 Size() = 0;
-    virtual base::Time LastModifiedTime() = 0;
-    virtual bool IsDirectory() = 0;
-  };
-
-  // A policy flag for CreateSnapshotFile.
-  enum SnapshotFilePolicy {
-    kSnapshotFileUnknown,
-
-    // The implementation just uses the local file as the snapshot file.
-    // The FileAPI backend does nothing on the returned file.
-    kSnapshotFileLocal,
-
-    // The implementation returns a temporary file as the snapshot file.
-    // The FileAPI backend takes care of the lifetime of the returned file
-    // and will delete when the last reference of the file is dropped.
-    kSnapshotFileTemporary,
-  };
-
-  class EmptyFileEnumerator : public AbstractFileEnumerator {
-    virtual FilePath Next() OVERRIDE;
-    virtual int64 Size() OVERRIDE;
-    virtual base::Time LastModifiedTime() OVERRIDE;
-    virtual bool IsDirectory() OVERRIDE;
-  };
-
-  virtual ~FileSystemFileUtil() {}
-
-  // Creates or opens a file with the given flags.
-  // If PLATFORM_FILE_CREATE is set in |file_flags| it always tries to create
-  // a new file at the given |url| and calls back with
-  // PLATFORM_FILE_ERROR_FILE_EXISTS if the |url| already exists.
-  virtual PlatformFileError CreateOrOpen(
-      FileSystemOperationContext* context,
-      const FileSystemURL& url,
-      int file_flags,
-      PlatformFile* file_handle,
-      bool* created) = 0;
-
-  // Closes the given file handle.
-  virtual PlatformFileError Close(
-      FileSystemOperationContext* context,
-      PlatformFile file) = 0;
-
-  // Ensures that the given |url| exist.  This creates a empty new file
-  // at |url| if the |url| does not exist.
-  // If a new file han not existed and is created at the |url|,
-  // |created| is set true and |error code|
-  // is set PLATFORM_FILE_OK.
-  // If the file already exists, |created| is set false and |error code|
-  // is set PLATFORM_FILE_OK.
-  // If the file hasn't existed but it couldn't be created for some other
-  // reasons, |created| is set false and |error code| indicates the error.
-  virtual PlatformFileError EnsureFileExists(
-      FileSystemOperationContext* context,
-      const FileSystemURL& url, bool* created) = 0;
-
-  // Creates directory at given url. It's an error to create
-  // if |exclusive| is true and dir already exists.
-  virtual PlatformFileError CreateDirectory(
-      FileSystemOperationContext* context,
-      const FileSystemURL& url,
-      bool exclusive,
-      bool recursive) = 0;
-
-  // Retrieves the information about a file.
-  virtual PlatformFileError GetFileInfo(
-      FileSystemOperationContext* context,
-      const FileSystemURL& url,
-      base::PlatformFileInfo* file_info,
-      FilePath* platform_path) = 0;
-
-  // Returns a pointer to a new instance of AbstractFileEnumerator which is
-  // implemented for each FileSystemFileUtil subclass. The instance needs to be
-  // freed by the caller, and its lifetime should not extend past when the
-  // current call returns to the main FILE message loop.
-  //
-  // The supplied context must remain valid at least lifetime of the enumerator
-  // instance.
-  virtual scoped_ptr<AbstractFileEnumerator> CreateFileEnumerator(
-      FileSystemOperationContext* context,
-      const FileSystemURL& root_url,
-      bool recursive) = 0;
-
-  // Maps |file_system_url| given |context| into |local_file_path|
-  // which represents physical file location on the host OS.
-  // This may not always make sense for all subclasses.
-  virtual PlatformFileError GetLocalFilePath(
-      FileSystemOperationContext* context,
-      const FileSystemURL& file_system_url,
-      FilePath* local_file_path) = 0;
-
-  // Updates the file metadata information.  Unlike posix's touch, it does
-  // not create a file even if |url| does not exist, but instead fails
-  // with PLATFORM_FILE_ERROR_NOT_FOUND.
-  virtual PlatformFileError Touch(
-      FileSystemOperationContext* context,
-      const FileSystemURL& url,
-      const base::Time& last_access_time,
-      const base::Time& last_modified_time) = 0;
-
-  // Truncates a file to the given length.  If |length| is greater than the
-  // current length of the file, the file will be extended with zeroes.
-  virtual PlatformFileError Truncate(
-      FileSystemOperationContext* context,
-      const FileSystemURL& url,
-      int64 length) = 0;
-
-  // Returns true if a given |url| is an empty directory.
-  virtual bool IsDirectoryEmpty(
-      FileSystemOperationContext* context,
-      const FileSystemURL& url) = 0;
-
-  // Copies or moves a single file from |src_url| to |dest_url|.
-  virtual PlatformFileError CopyOrMoveFile(
-      FileSystemOperationContext* context,
-      const FileSystemURL& src_url,
-      const FileSystemURL& dest_url,
-      bool copy) = 0;
-
-  // Copies in a single file from a different filesystem.
-  virtual PlatformFileError CopyInForeignFile(
-        FileSystemOperationContext* context,
-        const FilePath& src_file_path,
-        const FileSystemURL& dest_url) = 0;
-
-  // Deletes a single file.
-  // It assumes the given url points a file.
-  virtual PlatformFileError DeleteFile(
-      FileSystemOperationContext* context,
-      const FileSystemURL& url) = 0;
-
-  // Deletes a single empty directory.
-  // It assumes the given url points an empty directory.
-  virtual PlatformFileError DeleteSingleDirectory(
-      FileSystemOperationContext* context,
-      const FileSystemURL& url) = 0;
-
-  // Creates a local snapshot file for a given |url| and returns the
-  // metadata and platform path of the snapshot file via |callback|.
-  // In regular filesystem cases the implementation may simply return
-  // the metadata of the file itself (as well as GetMetadata does),
-  // while in non-regular filesystem case the backend may create a
-  // temporary snapshot file which holds the file data and return
-  // the metadata of the temporary file.
-  //
-  // |file_info| is the metadata of the snapshot file created.
-  // |platform_path| is the path to the snapshot file created.
-  // |policy| should indicate the policy how the fileapi backend
-  // should handle the returned file.
-  virtual base::PlatformFileError CreateSnapshotFile(
-      FileSystemOperationContext* context,
-      const FileSystemURL& url,
-      base::PlatformFileInfo* file_info,
-      FilePath* platform_path,
-      SnapshotFilePolicy* policy) = 0;
-
- protected:
-  FileSystemFileUtil() {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(FileSystemFileUtil);
-};
-
-}  // namespace fileapi
-
-#endif  // WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
+// 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.
+
+#ifndef WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
+#define WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_
+
+#include "base/file_path.h"
+#include "base/file_util_proxy.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/platform_file.h"
+#include "webkit/fileapi/file_system_url.h"
+#include "webkit/storage/webkit_storage_export.h"
+
+namespace base {
+class Time;
+}
+
+namespace webkit_blob {
+class ShareableFileReference;
+}
+
+namespace fileapi {
+
+using base::PlatformFile;
+using base::PlatformFileError;
+class FileSystemOperationContext;
+
+// A file utility interface that provides basic file utility methods for
+// FileSystem API.
+//
+// Layering structure of the FileSystemFileUtil was split out.
+// See http://crbug.com/128136 if you need it.
+class WEBKIT_STORAGE_EXPORT FileSystemFileUtil {
+ public:
+  // It will be implemented by each subclass such as FileSystemFileEnumerator.
+  class WEBKIT_STORAGE_EXPORT AbstractFileEnumerator {
+   public:
+    virtual ~AbstractFileEnumerator() {}
+
+    // Returns an empty string if there are no more results.
+    virtual FilePath Next() = 0;
+
+    virtual int64 Size() = 0;
+    virtual base::Time LastModifiedTime() = 0;
+    virtual bool IsDirectory() = 0;
+  };
+
+  // A policy flag for CreateSnapshotFile.
+  enum SnapshotFilePolicy {
+    kSnapshotFileUnknown,
+
+    // The implementation just uses the local file as the snapshot file.
+    // The FileAPI backend does nothing on the returned file.
+    kSnapshotFileLocal,
+
+    // The implementation returns a temporary file as the snapshot file.
+    // The FileAPI backend takes care of the lifetime of the returned file
+    // and will delete when the last reference of the file is dropped.
+    kSnapshotFileTemporary,
+  };
+
+  class WEBKIT_STORAGE_EXPORT EmptyFileEnumerator
+      : public AbstractFileEnumerator {
+    virtual FilePath Next() OVERRIDE;
+    virtual int64 Size() OVERRIDE;
+    virtual base::Time LastModifiedTime() OVERRIDE;
+    virtual bool IsDirectory() OVERRIDE;
+  };
+
+  virtual ~FileSystemFileUtil() {}
+
+  // Creates or opens a file with the given flags.
+  // If PLATFORM_FILE_CREATE is set in |file_flags| it always tries to create
+  // a new file at the given |url| and calls back with
+  // PLATFORM_FILE_ERROR_FILE_EXISTS if the |url| already exists.
+  virtual PlatformFileError CreateOrOpen(
+      FileSystemOperationContext* context,
+      const FileSystemURL& url,
+      int file_flags,
+      PlatformFile* file_handle,
+      bool* created) = 0;
+
+  // Closes the given file handle.
+  virtual PlatformFileError Close(
+      FileSystemOperationContext* context,
+      PlatformFile file) = 0;
+
+  // Ensures that the given |url| exist.  This creates a empty new file
+  // at |url| if the |url| does not exist.
+  // If a new file han not existed and is created at the |url|,
+  // |created| is set true and |error code|
+  // is set PLATFORM_FILE_OK.
+  // If the file already exists, |created| is set false and |error code|
+  // is set PLATFORM_FILE_OK.
+  // If the file hasn't existed but it couldn't be created for some other
+  // reasons, |created| is set false and |error code| indicates the error.
+  virtual PlatformFileError EnsureFileExists(
+      FileSystemOperationContext* context,
+      const FileSystemURL& url, bool* created) = 0;
+
+  // Creates directory at given url. It's an error to create
+  // if |exclusive| is true and dir already exists.
+  virtual PlatformFileError CreateDirectory(
+      FileSystemOperationContext* context,
+      const FileSystemURL& url,
+      bool exclusive,
+      bool recursive) = 0;
+
+  // Retrieves the information about a file.
+  virtual PlatformFileError GetFileInfo(
+      FileSystemOperationContext* context,
+      const FileSystemURL& url,
+      base::PlatformFileInfo* file_info,
+      FilePath* platform_path) = 0;
+
+  // Returns a pointer to a new instance of AbstractFileEnumerator which is
+  // implemented for each FileSystemFileUtil subclass. The instance needs to be
+  // freed by the caller, and its lifetime should not extend past when the
+  // current call returns to the main FILE message loop.
+  //
+  // The supplied context must remain valid at least lifetime of the enumerator
+  // instance.
+  virtual scoped_ptr<AbstractFileEnumerator> CreateFileEnumerator(
+      FileSystemOperationContext* context,
+      const FileSystemURL& root_url,
+      bool recursive) = 0;
+
+  // Maps |file_system_url| given |context| into |local_file_path|
+  // which represents physical file location on the host OS.
+  // This may not always make sense for all subclasses.
+  virtual PlatformFileError GetLocalFilePath(
+      FileSystemOperationContext* context,
+      const FileSystemURL& file_system_url,
+      FilePath* local_file_path) = 0;
+
+  // Updates the file metadata information.  Unlike posix's touch, it does
+  // not create a file even if |url| does not exist, but instead fails
+  // with PLATFORM_FILE_ERROR_NOT_FOUND.
+  virtual PlatformFileError Touch(
+      FileSystemOperationContext* context,
+      const FileSystemURL& url,
+      const base::Time& last_access_time,
+      const base::Time& last_modified_time) = 0;
+
+  // Truncates a file to the given length.  If |length| is greater than the
+  // current length of the file, the file will be extended with zeroes.
+  virtual PlatformFileError Truncate(
+      FileSystemOperationContext* context,
+      const FileSystemURL& url,
+      int64 length) = 0;
+
+  // Returns true if a given |url| is an empty directory.
+  virtual bool IsDirectoryEmpty(
+      FileSystemOperationContext* context,
+      const FileSystemURL& url) = 0;
+
+  // Copies or moves a single file from |src_url| to |dest_url|.
+  virtual PlatformFileError CopyOrMoveFile(
+      FileSystemOperationContext* context,
+      const FileSystemURL& src_url,
+      const FileSystemURL& dest_url,
+      bool copy) = 0;
+
+  // Copies in a single file from a different filesystem.
+  virtual PlatformFileError CopyInForeignFile(
+        FileSystemOperationContext* context,
+        const FilePath& src_file_path,
+        const FileSystemURL& dest_url) = 0;
+
+  // Deletes a single file.
+  // It assumes the given url points a file.
+  virtual PlatformFileError DeleteFile(
+      FileSystemOperationContext* context,
+      const FileSystemURL& url) = 0;
+
+  // Deletes a single empty directory.
+  // It assumes the given url points an empty directory.
+  virtual PlatformFileError DeleteSingleDirectory(
+      FileSystemOperationContext* context,
+      const FileSystemURL& url) = 0;
+
+  // Creates a local snapshot file for a given |url| and returns the
+  // metadata and platform path of the snapshot file via |callback|.
+  // In regular filesystem cases the implementation may simply return
+  // the metadata of the file itself (as well as GetMetadata does),
+  // while in non-regular filesystem case the backend may create a
+  // temporary snapshot file which holds the file data and return
+  // the metadata of the temporary file.
+  //
+  // |file_info| is the metadata of the snapshot file created.
+  // |platform_path| is the path to the snapshot file created.
+  // |policy| should indicate the policy how the fileapi backend
+  // should handle the returned file.
+  virtual base::PlatformFileError CreateSnapshotFile(
+      FileSystemOperationContext* context,
+      const FileSystemURL& url,
+      base::PlatformFileInfo* file_info,
+      FilePath* platform_path,
+      SnapshotFilePolicy* policy) = 0;
+
+ protected:
+  FileSystemFileUtil() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(FileSystemFileUtil);
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_FILEAPI_FILE_SYSTEM_FILE_UTIL_H_