89 lines
1.6 KiB
C
89 lines
1.6 KiB
C
/*
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* Copyright (c) 2017 Nordic Semiconductor ASA
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* Copyright (c) 2015 Runtime Inc
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <sys/crc.h>
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#include <fs/fcb.h>
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#include "fcb_priv.h"
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/*
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* Given offset in flash sector, fill in rest of the fcb_entry, and crc8 over
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* the data.
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*/
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int
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fcb_elem_crc8(struct fcb *fcb, struct fcb_entry *loc, uint8_t *c8p)
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{
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uint8_t tmp_str[FCB_TMP_BUF_SZ];
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int cnt;
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int blk_sz;
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uint8_t crc8;
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uint16_t len;
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uint32_t off;
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uint32_t end;
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int rc;
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if (loc->fe_elem_off + 2 > loc->fe_sector->fs_size) {
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return -ENOTSUP;
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}
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rc = fcb_flash_read(fcb, loc->fe_sector, loc->fe_elem_off, tmp_str, 2);
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if (rc) {
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return -EIO;
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}
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cnt = fcb_get_len(tmp_str, &len);
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if (cnt < 0) {
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return cnt;
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}
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loc->fe_data_off = loc->fe_elem_off + fcb_len_in_flash(fcb, cnt);
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loc->fe_data_len = len;
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crc8 = CRC8_CCITT_INITIAL_VALUE;
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crc8 = crc8_ccitt(crc8, tmp_str, cnt);
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off = loc->fe_data_off;
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end = loc->fe_data_off + len;
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for (; off < end; off += blk_sz) {
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blk_sz = end - off;
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if (blk_sz > sizeof(tmp_str)) {
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blk_sz = sizeof(tmp_str);
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}
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rc = fcb_flash_read(fcb, loc->fe_sector, off, tmp_str, blk_sz);
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if (rc) {
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return -EIO;
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}
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crc8 = crc8_ccitt(crc8, tmp_str, blk_sz);
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}
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*c8p = crc8;
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return 0;
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}
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int fcb_elem_info(struct fcb *fcb, struct fcb_entry *loc)
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{
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int rc;
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uint8_t crc8;
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uint8_t fl_crc8;
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off_t off;
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rc = fcb_elem_crc8(fcb, loc, &crc8);
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if (rc) {
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return rc;
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}
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off = loc->fe_data_off + fcb_len_in_flash(fcb, loc->fe_data_len);
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rc = fcb_flash_read(fcb, loc->fe_sector, off, &fl_crc8, sizeof(fl_crc8));
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if (rc) {
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return -EIO;
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}
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if (fl_crc8 != crc8) {
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return -EBADMSG;
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}
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return 0;
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}
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