mandoline filesystem: Rewrite using base::File.

components/filesystem/util.h

 // Copyright 2015 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 COMPONENTS_FILESYSTEM_UTIL_H_
 #define COMPONENTS_FILESYSTEM_UTIL_H_
 
+#include "base/files/file.h"
 #include "components/filesystem/public/interfaces/types.mojom.h"
 
 namespace mojo {
 class String;
 }
 
 namespace filesystem {
 
 // Validation functions (typically used to check arguments; they return
 // |ERROR_OK| if valid, else the standard/recommended error for the validation
 // error):
 
 // Checks if |path|, which must be non-null, is (looks like) a valid (relative)
 // path. (On failure, returns |ERROR_INVALID_ARGUMENT| if |path| is not UTF-8,
 // or |ERROR_PERMISSION_DENIED| if it is not relative.)
 Error IsPathValid(const mojo::String& path);
 
 // Checks if |whence| is a valid (known) |Whence| value. (On failure, returns
 // |ERROR_UNIMPLEMENTED|.)
 Error IsWhenceValid(Whence whence);
 
 // Checks if |offset| is a valid file offset (from some point); this is
 // implementation-dependent (typically checking if |offset| fits in an |off_t|).
 // (On failure, returns |ERROR_OUT_OF_RANGE|.)
 Error IsOffsetValid(int64_t offset);
 
 // Conversion functions:
 
-// Converts a standard errno value (|E...|) to an |Error| value.
-Error ErrnoToError(int errno_value);
+// Returns the platform dependent error details converted to the
+// filesystem.Error enum.
+Error GetError(const base::File& file);
 
-// Converts a |Whence| value to a standard whence value (|SEEK_...|).
-int WhenceToStandardWhence(Whence whence);
+// Serializes Info to the wire format.
+FileInformationPtr MakeFileInformation(const base::File::Info& info);
 
-// Converts a |Timespec| to a |struct timespec|. If |in| is null, |out->tv_nsec|
-// is set to |UTIME_OMIT|.
-Error TimespecToStandardTimespec(const Timespec* in, struct timespec* out);
-
-// Converts a |TimespecOrNow| to a |struct timespec|. If |in| is null,
-// |out->tv_nsec| is set to |UTIME_OMIT|; if |in->now| is set, |out->tv_nsec| is
-// set to |UTIME_NOW|.
-Error TimespecOrNowToStandardTimespec(const TimespecOrNow* in,
-                                      struct timespec* out);
-
-// Ensures that |open_flags| is one of the valid combinations listed in
-// types.mojom.
-Error ValidateOpenFlags(uint32_t open_flags, bool is_directory);
-
-// Ensures that |delete_flags| is one of the valid combinations listed in
-// types.mojom.
-Error ValidateDeleteFlags(uint32_t delete_flags);
+// Creates an absolute file path and ensures that we don't try to traverse up.
+Error ValidatePath(const mojo::String& raw_path,
+                   const base::FilePath& filesystem_base,
+                   base::FilePath* out);
 
 }  // namespace filesystem
 
 #endif  // COMPONENTS_FILESYSTEM_UTIL_H_