int
fcb_getnext_in_area(struct fcb *fcb, struct fcb_entry *loc)
{
int rc;
rc = fcb_elem_info(fcb, loc);
if (rc == 0 || rc == FCB_ERR_CRC) {
do {
loc->fe_elem_off = loc->fe_data_off +
fcb_len_in_flash(fcb, loc->fe_data_len) +
fcb_len_in_flash(fcb, FCB_CRC_SZ);
rc = fcb_elem_info(fcb, loc);
if (rc != FCB_ERR_CRC) {
break;
}
} while (rc == FCB_ERR_CRC);
}
return rc;
}
/*
* Given offset in flash area, fill in rest of the fcb_entry, and crc8 over
* the data.
*/
int
fcb_elem_crc8(struct fcb *fcb, struct fcb_entry *loc, uint8_t *c8p)
{
uint8_t tmp_str[FCB_TMP_BUF_SZ];
int cnt;
int blk_sz;
uint8_t crc8;
uint16_t len;
uint32_t off;
uint32_t end;
int rc;
if (loc->fe_elem_off + 2 > loc->fe_area->fa_size) {
return FCB_ERR_NOVAR;
}
rc = flash_area_read(loc->fe_area, loc->fe_elem_off, tmp_str, 2);
if (rc) {
return FCB_ERR_FLASH;
}
cnt = fcb_get_len(tmp_str, &len);
if (cnt < 0) {
return cnt;
}
loc->fe_data_off = loc->fe_elem_off + fcb_len_in_flash(fcb, cnt);
loc->fe_data_len = len;
crc8 = crc8_init();
crc8 = crc8_calc(crc8, tmp_str, cnt);
off = loc->fe_data_off;
end = loc->fe_data_off + len;
for (; off < end; off += blk_sz) {
blk_sz = end - off;
if (blk_sz > sizeof(tmp_str)) {
blk_sz = sizeof(tmp_str);
}
rc = flash_area_read(loc->fe_area, off, tmp_str, blk_sz);
if (rc) {
return FCB_ERR_FLASH;
}
crc8 = crc8_calc(crc8, tmp_str, blk_sz);
}
*c8p = crc8;
return 0;
}
int
fcb_elem_info(struct fcb *fcb, struct fcb_entry *loc)
{
int rc;
uint8_t crc8;
uint8_t fl_crc8;
uint32_t off;
rc = fcb_elem_crc8(fcb, loc, &crc8);
if (rc) {
return rc;
}
off = loc->fe_data_off + fcb_len_in_flash(fcb, loc->fe_data_len);
rc = flash_area_read(loc->fe_area, off, &fl_crc8, sizeof(fl_crc8));
if (rc) {
return FCB_ERR_FLASH;
}
if (fl_crc8 != crc8) {
return FCB_ERR_CRC;
}
return 0;
}
