1 files changed, 73 insertions, 0 deletions
diff --git a/ftpfs/ccache.h b/ftpfs/ccache.h
new file mode 100644
index 00000000..410720c3
--- /dev/null
+++ b/ftpfs/ccache.h
@@ -0,0 +1,73 @@
+/* Remote file contents caching
+
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   Written by Miles Bader <miles@gnu.ai.mit.edu>
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */
+
+#ifndef __CCACHE_H__
+#define __CCACHE_H__
+
+#include "ftpfs.h"
+
+struct ccache
+{
+  /* The filesystem node this is a cache of.  */
+  struct node *node;
+
+  /* In memory file image, alloced using vm_allocate.  */
+  char *image;
+
+  /* Size of data.  */
+  off_t size;
+
+  /* Upper bounds of fetched image.  */
+  off_t max;
+
+  /* Amount of IMAGE that has been allocated.  */
+  size_t alloced;
+
+  struct mutex lock;
+
+  /* People can wait for a reading thread on this condition.  */
+  struct condition wakeup;
+
+  /* True if some thread is now fetching data.  Only that thread should
+     modify the DATA_CONN, DATA_CONN_POS, and MAX fields.  */
+  int fetching_active;
+
+  /* Ftp connection over which data is being fetched, or 0.  */
+  struct ftp_conn *conn;
+  /* File descriptor over which data is being fetched.  */
+  int data_conn;
+  /* Where DATA_CONN points in the file.  */
+  off_t data_conn_pos;
+};
+
+/* Read LEN bytes at OFFS in the file referred to by CC into DATA, or return
+   an error.  */
+error_t ccache_read (struct ccache *cc, off_t offs, size_t len, void *data);
+
+/* Discard any cached contents in CC.  */
+error_t ccache_invalidate (struct ccache *cc);
+
+/* Return a ccache object for NODE in CC.  */
+error_t ccache_create (struct node *node, struct ccache **cc);
+
+/* Free all resources used by CC.  */
+void ccache_free (struct ccache *cc);
+
+#endif /* __CCACHE_H__ */