89 lines
3.3 KiB
C
89 lines
3.3 KiB
C
/* ****************************************************************************
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* link/seven_fs/getfreemem.c -- get the available free space on a 7.00 fs.
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* Copyright (C) 2020 Alan "Lailouezzz" Le Bouder <alanlebouder@gmail.com>
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*
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* This file is part of libcasio.
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* libcasio is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 3.0 of the License,
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* or (at your option) any later version.
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*
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* libcasio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libcasio; if not, see <http://www.gnu.org/licenses/>.
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* ************************************************************************* */
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#include "seven_fs.h"
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/**
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* casio_sevenfs_getfreemem:
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* Get the available free space on a Protocol 7.00 filesystem.
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*
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* @arg cookie the cookie.
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* @arg path the path.
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* @arg capacity the pointer to capacity
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* @return the error code (0 if ok).
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*/
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int CASIO_EXPORT casio_sevenfs_getfreemem(sevenfs_cookie_t *cookie,
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sevenfs_path_t *path,
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size_t *capacity)
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{
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int err;
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casio_link_t *handle = cookie;
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const char *devname = (path->sevenfs_path_dev != 0xFF) ?
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&path->sevenfs_path_data[path->sevenfs_path_dev] :
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NULL;
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/* Some checks */
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chk_handle(handle);
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chk_active(handle);
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if (devname == NULL)
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return (casio_error_op);
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/* Send command packet */
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if ((err = casio_seven_send_cmdfls_reqcapacity(handle, devname))) {
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msg((ll_fatal, "Couldn't send request/didn't receive answer"));
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return (casio_error_unknown);
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}
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/* Check response packet */
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if (response.casio_seven_packet_type == casio_seven_type_nak
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&& response.casio_seven_packet_code == casio_seven_err_other) {
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msg((ll_fatal, "File system probably doesn't exist"));
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return (casio_error_device);
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} else if (response.casio_seven_packet_type != casio_seven_type_ack) {
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msg((ll_fatal, "Didn't receive ack ro known error..."));
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return (casio_error_unknown);
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}
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/* Swap roles */
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msg((ll_info, "Sending roleswap"));
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if ((err = casio_seven_send_roleswp(handle))) {
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msg((ll_fatal, "Couldn't swap roles"));
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return (err);
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} else if (response.casio_seven_packet_type != casio_seven_type_cmd
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|| response.casio_seven_packet_code != 0x4C
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|| !response.casio_seven_packet_args[4]) {
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msg((ll_fatal, "Didn't receive expected comand"));
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return (casio_error_unknown);
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}
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/* Decode thingy */
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*capacity = response.casio_seven_packet_filesize;
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/* ack and check for the roleswap */
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msg((ll_info, "Return ack and wait for roleswp"));
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if ((err = casio_seven_send_ack(handle, 1))) {
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msg((ll_fatal, "Unable to send ack"));
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return (err);
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} else if (response.casio_seven_packet_type != casio_seven_type_swp) {
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return (casio_error_unknown);
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}
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/* No error */
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return (0);
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} |