/* Internal key index structure. */
struct key_idx_s 
{
  off_t offset;
  u32 keyid[2];
  byte fpr[KEY_FPR_LEN];
};
typedef struct key_idx_s *key_idx_t;

/* Internal key cache to associate a key with an file offset. */
struct key_table_s 
{
  struct key_table_s *next;
  off_t offset;
};
typedef struct key_table_s *key_table_t;

typedef struct cdk_keydb_search_s
{
  off_t off; /* last file offset */
  union 
    {    
      char *pattern; /* A search is performed by pattern. */
      u32 keyid[2];  /* A search by keyid. */
      byte fpr[KEY_FPR_LEN]; /* A search by fingerprint. */
    } u;
  int type;
  struct key_table_s *cache;
  size_t ncache;
  unsigned int no_cache:1; /* disable the index cache. */

  cdk_stream_t idx;
  char *idx_name;        /* name of the index file or NULL. */

} cdk_keydb_search_s;

/* Internal key database handle. */
struct cdk_keydb_hd_s 
{
  int type;   /* type of the key db handle. */
  int fp_ref; /* 1=means it is a reference and shall not be closed. */
  cdk_stream_t fp;
  char *name;            /* name of the underlying file or NULL. */
  unsigned int secret:1;   /* contain secret keys. */
  unsigned int isopen:1;   /* the underlying stream is opened. */
  
  /* structure to store some stats about the keydb. */
  struct {
    size_t new_keys; /* amount of new keys that were imported. */
  } stats;
};