void
nffs_crc_disk_block_fill(struct nffs_disk_block *disk_block, const void *data)
{
uint16_t crc16;
crc16 = nffs_crc_disk_block_hdr(disk_block);
crc16 = crc16_ccitt(crc16, data, disk_block->ndb_data_len);
disk_block->ndb_crc16 = crc16;
}
static int
nffs_write_fill_crc16_overwrite(struct nffs_disk_block *disk_block,
uint8_t src_area_idx, uint32_t src_area_offset,
uint16_t left_copy_len, uint16_t right_copy_len,
const void *new_data, uint16_t new_data_len)
{
uint16_t block_off;
uint16_t crc16;
int rc;
block_off = 0;
crc16 = nffs_crc_disk_block_hdr(disk_block);
block_off += sizeof *disk_block;
/* Copy data from the start of the old block, in case the new data starts
* at a non-zero offset.
*/
if (left_copy_len > 0) {
rc = nffs_crc_flash(crc16, src_area_idx, src_area_offset + block_off,
left_copy_len, &crc16);
if (rc != 0) {
return rc;
}
block_off += left_copy_len;
}
/* Write the new data into the data block. This may extend the block's
* length beyond its old value.
*/
crc16 = crc16_ccitt(crc16, new_data, new_data_len);
block_off += new_data_len;
/* Copy data from the end of the old block, in case the new data doesn't
* extend to the end of the block.
*/
if (right_copy_len > 0) {
rc = nffs_crc_flash(crc16, src_area_idx, src_area_offset + block_off,
right_copy_len, &crc16);
if (rc != 0) {
return rc;
}
block_off += right_copy_len;
}
assert(block_off == sizeof *disk_block + disk_block->ndb_data_len);
disk_block->ndb_crc16 = crc16;
return 0;
}
static int
nffs_crc_disk_block(const struct nffs_disk_block *disk_block,
uint8_t area_idx, uint32_t area_offset,
uint16_t *out_crc)
{
uint16_t crc;
int rc;
crc = nffs_crc_disk_block_hdr(disk_block);
rc = nffs_crc_flash(crc, area_idx, area_offset + sizeof *disk_block,
disk_block->ndb_data_len, &crc);
if (rc != 0) {
return rc;
}
*out_crc = crc;
return 0;
}
