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/* Store wire encoding/decoding
Copyright (C) 1996, 1997, 1999 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. */
#include <string.h>
#include <sys/mman.h>
#include "store.h"
/* Initialize ENC. The given vector and sizes will be used for the encoding
if they are big enough (otherwise new ones will be automatically
allocated). */
void
store_enc_init (struct store_enc *enc,
mach_port_t *ports, mach_msg_type_number_t num_ports,
int *ints, mach_msg_type_number_t num_ints,
off_t *offsets, mach_msg_type_number_t num_offsets,
char *data, mach_msg_type_number_t data_len)
{
memset (enc, 0, sizeof(*enc));
enc->ports = enc->init_ports = ports;
enc->num_ports = num_ports;
enc->ints = enc->init_ints = ints;
enc->num_ints = num_ints;
enc->offsets = enc->init_offsets = offsets;
enc->num_offsets = num_offsets;
enc->data = enc->init_data = data;
enc->data_len = data_len;
}
/* Deallocate storage used by the fields in ENC (but nothing is done with ENC
itself). */
void
store_enc_dealloc (struct store_enc *enc)
{
if (enc->ports && enc->num_ports > 0)
/* For ports, we must deallocate each port as well. */
{
while (enc->cur_port < enc->num_ports)
{
mach_port_t port = enc->ports[enc->cur_port++];
if (port != MACH_PORT_NULL)
mach_port_deallocate (mach_task_self (), port);
}
if (enc->ports != enc->init_ports)
munmap ((caddr_t) enc->ports, enc->num_ports * sizeof (*enc->ports));
}
if (enc->ints && enc->num_ints > 0 && enc->ints != enc->init_ints)
munmap ((caddr_t) enc->ints, enc->num_ints * sizeof (*enc->ints));
if (enc->offsets && enc->num_offsets > 0
&& enc->offsets != enc->init_offsets)
munmap ((caddr_t) enc->offsets, enc->num_offsets * sizeof (*enc->offsets));
if (enc->data && enc->data_len > 0 && enc->data != enc->init_data)
munmap (enc->data, enc->data_len);
/* For good measure... */
memset (enc, 0, sizeof(*enc));
}
/* Copy out the parameters from ENC into the given variables suitably for
returning from a file_get_storage_info rpc, and deallocate ENC. */
void
store_enc_return (struct store_enc *enc,
mach_port_t **ports, mach_msg_type_number_t *num_ports,
int **ints, mach_msg_type_number_t *num_ints,
off_t **offsets, mach_msg_type_number_t *num_offsets,
char **data, mach_msg_type_number_t *data_len)
{
*ports = enc->ports;
*num_ports = enc->num_ports;
*ints = enc->ints;
*num_ints = enc->num_ints;
*offsets = enc->offsets;
*num_offsets = enc->num_offsets;
*data = enc->data;
*data_len = enc->data_len;
}
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