Adding some utility functions that work on file handles, and adding

the corresponding relays to file_util_proxy.

BUG=none
TEST=none


Review URL: http://codereview.chromium.org/3303007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@59007 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 51 insertions, 0 deletions

diff --git a/base/file_util_proxy.h b/base/file_util_proxy.h
index 929dcd7..581738d 100644
--- a/base/file_util_proxy.h
+++ b/base/file_util_proxy.h
@@ -72,6 +72,11 @@ class FileUtilProxy {
       const FilePath& file_path,
       GetFileInfoCallback* callback);
 
+  static bool GetFileInfoFromPlatformFile(
+      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      base::PlatformFile file,
+      GetFileInfoCallback* callback);
+
   typedef Callback2<base::PlatformFileError /* error code */,
       const std::vector<base::file_util_proxy::Entry>&
        >::Type ReadDirectoryCallback;
@@ -119,6 +124,52 @@ class FileUtilProxy {
       const FilePath& file_path,
       StatusCallback* callback);
 
+  // Reads from a file. On success, the file pointer is moved to position
+  // |offset + bytes_to_read| in the file. The callback can be NULL.
+  typedef Callback2<base::PlatformFileError /* error code */,
+                    int /* bytes read/written */>::Type ReadWriteCallback;
+  static bool Read(
+      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      base::PlatformFile file,
+      int64 offset,
+      char* buffer,
+      int bytes_to_read,
+      ReadWriteCallback* callback);
+
+  // Writes to a file. If |offset| is greater than the length of the file,
+  // |false| is returned. On success, the file pointer is moved to position
+  // |offset + bytes_to_write| in the file. If The callback can be NULL.
+  static bool Write(
+      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      base::PlatformFile file,
+      int64 offset,
+      const char* buffer,
+      int bytes_to_write,
+      ReadWriteCallback* callback);
+
+  // Touches a file. The callback can be NULL.
+  static bool Touch(
+      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      base::PlatformFile file,
+      const base::Time& last_access_time,
+      const base::Time& last_modified_time,
+      StatusCallback* callback);
+
+  // 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.
+  // The callback can be NULL.
+  static bool Truncate(
+      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      base::PlatformFile file,
+      long long length,
+      StatusCallback* callback);
+
+  // Flushes a file. The callback can be NULL.
+  static bool Flush(
+      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      base::PlatformFile file,
+      StatusCallback* callback);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(FileUtilProxy);
 };