text: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *  http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  #ifndef __SYS_FCB_PRIV_H_
  #define __SYS_FCB_PRIV_H_
  
  #define FCB_CRC_SZ	sizeof(uint8_t)
  #define FCB_TMP_BUF_SZ	32
  
  #define FCB_ID_GT(a, b) (((int16_t)(a) - (int16_t)(b)) > 0)
  
  struct fcb_disk_area {
      uint32_t fd_magic;
      uint8_t  fd_ver;
      uint8_t  _pad;
      uint16_t fd_id;
  };
  
  int fcb_put_len(uint8_t *buf, uint16_t len);
  int fcb_get_len(uint8_t *buf, uint16_t *len);
  
  static inline int
  fcb_len_in_flash(struct fcb *fcb, uint16_t len)
  {
      if (fcb->f_align <= 1) {
          return len;
      }
      return (len + (fcb->f_align - 1)) & ~(fcb->f_align - 1);
  }
  
  int fcb_getnext_in_area(struct fcb *fcb, struct fcb_entry *loc);
  struct flash_area *fcb_getnext_area(struct fcb *fcb, struct flash_area *fap);
  int fcb_getnext_nolock(struct fcb *fcb, struct fcb_entry *loc);
  
  int fcb_elem_info(struct fcb *, struct fcb_entry *);
  int fcb_elem_crc8(struct fcb *, struct fcb_entry *loc, uint8_t *crc8p);
  
  int fcb_sector_hdr_init(struct fcb *, struct flash_area *fap, uint16_t id);
  int fcb_sector_hdr_read(struct fcb *, struct flash_area *fap,
    struct fcb_disk_area *fdap);
  
  #endif
  