[gvfs] afp: Allow seek past end of file

[Alexander Larsson <alexl src gnome org>]

commit 1474a61207aa33362a674abe674c822691a57331
Author: Alexander Larsson <alexl redhat com>
Date:   Tue Oct 8 09:28:18 2013 +0200

    afp: Allow seek past end of file
    
    Also, only query file size if needed for G_SEEK_END.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=709432

 daemon/gvfsbackendafp.c |   62 ++++++++++++++++++++--------------------------
 1 files changed, 27 insertions(+), 35 deletions(-)
---
diff --git a/daemon/gvfsbackendafp.c b/daemon/gvfsbackendafp.c
index 679bc2c..510ce87 100644
--- a/daemon/gvfsbackendafp.c
+++ b/daemon/gvfsbackendafp.c
@@ -725,23 +725,10 @@ seek_on_write_cb (GObject *source_object, GAsyncResult *res, gpointer user_data)
   size = g_file_info_get_size (info);
   g_object_unref (info);
 
-  switch (job->seek_type)
-  {
-    case G_SEEK_CUR:
-      afp_handle->offset += job->requested_offset;
-      break;
-    case G_SEEK_SET:
-      afp_handle->offset = job->requested_offset;
-      break;
-    case G_SEEK_END:
-      afp_handle->offset = size + job->requested_offset;
-      break;
-  }
+  afp_handle->offset = size + job->requested_offset;
 
   if (afp_handle->offset < 0)
     afp_handle->offset = 0;
-  else if (afp_handle->offset > size)
-    afp_handle->offset = size;
 
   g_vfs_job_seek_write_set_offset (job, afp_handle->offset);
   g_vfs_job_succeeded (G_VFS_JOB (job));
@@ -757,7 +744,8 @@ try_seek_on_write (GVfsBackend *backend,
   GVfsBackendAfp *afp_backend = G_VFS_BACKEND_AFP (backend);
   AfpHandle *afp_handle = (AfpHandle *)handle;
 
-  if (afp_handle->type == AFP_HANDLE_TYPE_REPLACE_FILE_DIRECT)
+  if (afp_handle->type == AFP_HANDLE_TYPE_REPLACE_FILE_DIRECT ||
+      job->seek_type != G_SEEK_END)
   {
     switch (job->seek_type)
     {
@@ -774,8 +762,6 @@ try_seek_on_write (GVfsBackend *backend,
 
     if (afp_handle->offset < 0)
       afp_handle->offset = 0;
-    else if (afp_handle->offset > afp_handle->size)
-      afp_handle->offset = afp_handle->size;
 
     g_vfs_job_seek_write_set_offset (job, afp_handle->offset);
     g_vfs_job_succeeded (G_VFS_JOB (job));
@@ -813,23 +799,10 @@ seek_on_read_cb (GObject *source_object, GAsyncResult *res, gpointer user_data)
   size = g_file_info_get_size (info);
   g_object_unref (info);
 
-  switch (job->seek_type)
-  {
-    case G_SEEK_CUR:
-      afp_handle->offset += job->requested_offset;
-      break;
-    case G_SEEK_SET:
-      afp_handle->offset = job->requested_offset;
-      break;
-    case G_SEEK_END:
-      afp_handle->offset = size + job->requested_offset;
-      break;
-  }
+  afp_handle->offset = size + job->requested_offset;
 
   if (afp_handle->offset < 0)
     afp_handle->offset = 0;
-  else if (afp_handle->offset > size)
-    afp_handle->offset = size;
 
   g_vfs_job_seek_read_set_offset (job, afp_handle->offset);
   g_vfs_job_succeeded (G_VFS_JOB (job));
@@ -845,10 +818,29 @@ try_seek_on_read (GVfsBackend *backend,
   GVfsBackendAfp *afp_backend = G_VFS_BACKEND_AFP (backend);
   AfpHandle *afp_handle = (AfpHandle *)handle;
 
-  g_vfs_afp_volume_get_fork_parms (afp_backend->volume, afp_handle->fork_refnum,
-                                   AFP_FILE_BITMAP_EXT_DATA_FORK_LEN_BIT,
-                                   G_VFS_JOB (job)->cancellable, seek_on_read_cb, job);
-  
+  if (job->seek_type != G_SEEK_END)
+  {
+    switch (job->seek_type)
+    {
+      case G_SEEK_CUR:
+        afp_handle->offset += job->requested_offset;
+        break;
+      case G_SEEK_SET:
+        afp_handle->offset = job->requested_offset;
+        break;
+    }
+
+    if (afp_handle->offset < 0)
+      afp_handle->offset = 0;
+
+    g_vfs_job_seek_read_set_offset (job, afp_handle->offset);
+    g_vfs_job_succeeded (G_VFS_JOB (job));
+  }
+  else
+    g_vfs_afp_volume_get_fork_parms (afp_backend->volume, afp_handle->fork_refnum,
+                                     AFP_FILE_BITMAP_EXT_DATA_FORK_LEN_BIT,
+                                     G_VFS_JOB (job)->cancellable, seek_on_read_cb, job);
+
   return TRUE;
 }