Initial revision

1 files changed, 112 insertions, 0 deletions

diff --git a/libstore/encode.c b/libstore/encode.c
new file mode 100644
index 00000000..240a55d2
--- /dev/null
+++ b/libstore/encode.c
@@ -0,0 +1,112 @@
+/* Store wire encoding
+
+   Copyright (C) 1996 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include <string.h>
+
+#include "store.h"
+
+/* Default encoding used for most leaf store types.  */
+
+error_t
+store_default_leaf_allocate_encoding (struct store *store,
+				      struct store_enc *enc)
+{
+  enc->ports_len++;
+  enc->ints_len += 6;
+  enc->offsets_len += store->runs_len;
+  if (store->name)
+    enc->data_len += strlen (store->name) + 1;
+  enc->data_len += store->misc_len;
+  return 0;
+}
+
+error_t
+store_default_leaf_encode (struct store *store, struct store_enc *enc)
+{
+  size_t name_len = (store->name ? strlen (store->name) + 1 : 0);
+
+  enc->ports[enc->cur_port++] = store->port;
+
+  enc->ints[enc->cur_int++] = store->class;
+  enc->ints[enc->cur_int++] = store->flags;
+  enc->ints[enc->cur_int++] = store->block_size;
+  enc->ints[enc->cur_int++] = store->runs_len;
+  enc->ints[enc->cur_int++] = name_len;
+  enc->ints[enc->cur_int++] = 0; /* User can fill this in if wanted.  */
+
+  for (i = 0; i < store->runs_len; i++)
+    enc->offsets[enc->cur_offset++] = store->runs[i];
+
+  if (store->name)
+    {
+      bcopy (store->name, enc->data + enc->cur_data, name_len);
+      enc->cur_data += name_len;
+    }
+  if (store->misc_len)
+    {
+      bcopy (store->misc, enc->data + enc->cur_data, store->misc_len);
+      enc->cur_data += store->misc_len;
+    }
+
+  return 0;
+}
+
+/* Encode STORE into ENC, or return an error.   The contents of ENC may
+   then be return as the value of file_get_storage_info; if for some reason
+   this can't be done, store_enc_dealloc may be used to deallocate the
+   mmemory used by the unsent vectors.  */
+error_t
+store_encode (const struct store *store, struct store_enc *enc)
+{
+  error_t err;
+  struct store_meths *meths = store->meths;
+
+  if (!meths->allocate_encoding || !meths->encoding)
+    return EOPNOTSUPP;
+
+  bzero (enc, sizeof (*enc));
+
+  err = (*meths->allocate_encoding) (store, enc);
+  if (err)
+    return err;
+
+  if (enc->ports_len > 0)
+    err = vm_allocate (mach_task_self (),
+		       (vm_address_t *)&enc->ports, enc->ports_len, 1);
+  if (!err && enc->ints_len > 0)
+    err = vm_allocate (mach_task_self (),
+		       (vm_address_t *)&enc->ints, enc->ints_len, 1);
+  if (!err && enc->offsets_len > 0)
+    err = vm_allocate (mach_task_self (),
+		       (vm_address_t *)&enc->offsets, enc->offsets_len, 1);
+  if (!err && enc->data_len > 0)
+    err = vm_allocate (mach_task_self (),
+		       (vm_address_t *)&enc->data, enc->data_len, 1);
+
+  if (! err)
+    err = (*meths->encode) (store, enc);
+
+  if (err)
+    store_enc_dealloc (enc);
+
+  return err;
+}