[gvfs/gnome-3-8] sftp: Allow seek past end of file

[Alexander Larsson <alexl src gnome org>]

commit 1578ee5cdb90f6980954ba7cb9c7fc555dde80e0
Author: Alexander Larsson <alexl redhat com>
Date:   Tue Oct 8 09:26:19 2013 +0200

    sftp: Allow seek past end of file
    
    also, don't query for the file size unless required for SEEK_END
    
    https://bugzilla.gnome.org/show_bug.cgi?id=709432

 daemon/gvfsbackendsftp.c |   94 ++++++++++++++++++++++++++-------------------
 1 files changed, 54 insertions(+), 40 deletions(-)
---
diff --git a/daemon/gvfsbackendsftp.c b/daemon/gvfsbackendsftp.c
index 4bb8cc8..127d61f 100644
--- a/daemon/gvfsbackendsftp.c
+++ b/daemon/gvfsbackendsftp.c
@@ -2539,24 +2539,11 @@ seek_read_fstat_reply (GVfsBackendSftp *backend,
 
   op_job = G_VFS_JOB_SEEK_READ (job);
 
-  switch (op_job->seek_type)
-    {
-    case G_SEEK_CUR:
-      handle->offset += op_job->requested_offset;
-      break;
-    case G_SEEK_SET:
-      handle->offset = op_job->requested_offset;
-      break;
-    case G_SEEK_END:
-      handle->offset = file_size + op_job->requested_offset;
-      break;
-    }
+  handle->offset = file_size + op_job->requested_offset;
 
   if (handle->offset < 0)
     handle->offset = 0;
-  if (handle->offset > file_size)
-    handle->offset = file_size;
-  
+
   g_vfs_job_seek_read_set_offset (op_job, handle->offset);
   g_vfs_job_succeeded (job);
 }
@@ -2572,11 +2559,31 @@ try_seek_on_read (GVfsBackend *backend,
   GVfsBackendSftp *op_backend = G_VFS_BACKEND_SFTP (backend);
   GDataOutputStream *command;
 
-  command = new_command_stream (op_backend,
-                                SSH_FXP_FSTAT);
-  put_data_buffer (command, handle->raw_handle);
-  
-  queue_command_stream_and_free (op_backend, command, seek_read_fstat_reply, G_VFS_JOB (job), handle);
+  if (job->seek_type == G_SEEK_END)
+    {
+      command = new_command_stream (op_backend,
+                                    SSH_FXP_FSTAT);
+      put_data_buffer (command, handle->raw_handle);
+      queue_command_stream_and_free (op_backend, command, seek_read_fstat_reply, G_VFS_JOB (job), handle);
+    }
+  else
+    {
+      switch (job->seek_type)
+        {
+        case G_SEEK_CUR:
+          handle->offset += job->requested_offset;
+          break;
+        case G_SEEK_SET:
+          handle->offset = job->requested_offset;
+          break;
+        }
+
+      if (handle->offset < 0)
+        handle->offset = 0;
+
+      g_vfs_job_seek_read_set_offset (job, handle->offset);
+      g_vfs_job_succeeded (G_VFS_JOB (job));
+    }
 
   return TRUE;
 }
@@ -3612,24 +3619,11 @@ seek_write_fstat_reply (GVfsBackendSftp *backend,
 
   op_job = G_VFS_JOB_SEEK_WRITE (job);
 
-  switch (op_job->seek_type)
-    {
-    case G_SEEK_CUR:
-      handle->offset += op_job->requested_offset;
-      break;
-    case G_SEEK_SET:
-      handle->offset = op_job->requested_offset;
-      break;
-    case G_SEEK_END:
-      handle->offset = file_size + op_job->requested_offset;
-      break;
-    }
+  handle->offset = file_size + op_job->requested_offset;
 
   if (handle->offset < 0)
     handle->offset = 0;
-  if (handle->offset > file_size)
-    handle->offset = file_size;
-  
+
   g_vfs_job_seek_write_set_offset (op_job, handle->offset);
   g_vfs_job_succeeded (job);
 }
@@ -3645,11 +3639,31 @@ try_seek_on_write (GVfsBackend *backend,
   GVfsBackendSftp *op_backend = G_VFS_BACKEND_SFTP (backend);
   GDataOutputStream *command;
 
-  command = new_command_stream (op_backend,
-                                SSH_FXP_FSTAT);
-  put_data_buffer (command, handle->raw_handle);
-  
-  queue_command_stream_and_free (op_backend, command, seek_write_fstat_reply, G_VFS_JOB (job), handle);
+  if (job->seek_type == G_SEEK_END)
+    {
+      command = new_command_stream (op_backend,
+                                    SSH_FXP_FSTAT);
+      put_data_buffer (command, handle->raw_handle);
+      queue_command_stream_and_free (op_backend, command, seek_write_fstat_reply, G_VFS_JOB (job), handle);
+    }
+  else
+    {
+      switch (job->seek_type)
+        {
+        case G_SEEK_CUR:
+          handle->offset += job->requested_offset;
+          break;
+        case G_SEEK_SET:
+          handle->offset = job->requested_offset;
+          break;
+        }
+
+      if (handle->offset < 0)
+        handle->offset = 0;
+
+      g_vfs_job_seek_write_set_offset (job, handle->offset);
+      g_vfs_job_succeeded (G_VFS_JOB (job));
+    }
 
   return TRUE;
 }