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authorMiles Bader <miles@gnu.org>1996-03-22 00:45:06 +0000
committerMiles Bader <miles@gnu.org>1996-03-22 00:45:06 +0000
commit67e2194049b5da9cb8c2474239fbaaf52ddffb36 (patch)
tree855dd14251f76a43a647b1b6f97abba7e87bff57
parent0ce7ce68d043d0177113752b7293ca74e1083718 (diff)
Initial revision
-rw-r--r--libstore/encode.c112
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;
+}