81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/* *****************************************************************************
|
|
* storage/getfreemem.c -- get the amount of free memory on the calculator.
|
|
* Copyright (C) 2016-2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
|
|
*
|
|
* This file is part of libp7.
|
|
* libp7 is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU Lesser General Public License as published by
|
|
* the Free Software Foundation; either version 3.0 of the License,
|
|
* or (at your option) any later version.
|
|
*
|
|
* libp7 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 Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with libp7; if not, see <http://www.gnu.org/licenses/>.
|
|
* ************************************************************************** */
|
|
#include <libp7/internals.h>
|
|
|
|
/**
|
|
* p7_getfreemem:
|
|
* Request a device's capacity.
|
|
*
|
|
* @arg handle the libp7 handle.
|
|
* @arg devname the device name.
|
|
* @arg capacity pointer to the capacity to fill.
|
|
* @return if there was an error.
|
|
*/
|
|
|
|
int p7_getfreemem(p7_handle_t *handle, const char *devname,
|
|
p7uint_t *capacity)
|
|
{
|
|
int err;
|
|
/* make checks */
|
|
chk_handle(handle);
|
|
chk_active(handle);
|
|
|
|
/* send command packet */
|
|
log_info("sending capacity transmit request");
|
|
if ((err = p7_send_cmdfls_reqcapacity(handle, devname))) {
|
|
log_fatal("couldn't send request/didn't receive answer");
|
|
return (err);
|
|
}
|
|
|
|
/* check response packet */
|
|
if (response.type == p7_pt_error
|
|
&& response.code == p7_err_other) {
|
|
log_fatal("filesystem probably doesn't exist");
|
|
return (p7_error_unsupported_device);
|
|
} else if (response.type != p7_pt_ack) {
|
|
log_fatal("didn't receive ack or known error...");
|
|
return (p7_error_unknown);
|
|
}
|
|
|
|
/* swap roles */
|
|
log_info("sending roleswap");
|
|
if ((err = p7_send_roleswp(handle))) {
|
|
log_fatal("couldn't swap roles");
|
|
return (err);
|
|
} else if (response.type != p7_pt_cmd || response.code != 0x4C
|
|
|| !response.args[4]) {
|
|
log_fatal("didn't receive expected command");
|
|
return (p7_error_unknown);
|
|
}
|
|
|
|
/* decode thingy */
|
|
*capacity = response.filesize;
|
|
|
|
/* ack and check for the roleswap */
|
|
log_info("return ack and wait for roleswp");
|
|
if ((err = p7_send_ack(handle, 1))) {
|
|
log_fatal("unable to send ack.");
|
|
return (err);
|
|
} else if (response.type != p7_pt_roleswp)
|
|
return (p7_error_unknown);
|
|
|
|
/* no error! */
|
|
return (0);
|
|
}
|