2 * Copyright (c) 1995-1997, Index Data.
3 * See the file LICENSE for details.
5 * IsamH is a simple ISAM that can only append to the end of the list.
6 * It will need a clean-up process occasionally... Code stolen from
11 * Detailed log at the end of the file
24 typedef struct ISAMD_s *ISAMD;
26 typedef struct ISAMD_PP_s *ISAMD_PP;
28 typedef struct ISAMD_filecat_s { /* filecategories, mostly block sizes */
29 int bsize; /* block size */
30 int mblocks; /* maximum keys before switching to larger sizes */
33 typedef struct ISAMD_M_s {
34 ISAMD_filecat filecat;
36 int (*compare_item)(const void *a, const void *b);
38 #define ISAMD_DECODE 0
39 #define ISAMD_ENCODE 1
40 void *(*code_start)(int mode);
41 void (*code_stop)(int mode, void *p);
42 void (*code_item)(int mode, void *p, char **dst, char **src);
43 void (*code_reset)(void *p);
49 typedef struct ISAMD_I_s { /* encapsulation of input data */
50 int (*read_item)(void *clientData, char **dst, int *insertMode);
54 ISAMD_M isamd_getmethod (ISAMD_M me);
56 ISAMD isamd_open (BFiles bfs, const char *name, int writeflag, ISAMD_M method);
57 int isamd_close (ISAMD is);
58 ISAMD_P isamd_append (ISAMD is, ISAMD_P pos, ISAMD_I data);
59 /* corresponds to isc_merge */
62 ISAMD_PP isamd_pp_open (ISAMD is, ISAMD_P pos);
63 void isamd_pp_close (ISAMD_PP pp);
64 int isamd_read_item (ISAMD_PP pp, char **dst);
65 int isamd_read_main_item (ISAMD_PP pp, char **dst);
66 int isamd_pp_read (ISAMD_PP pp, void *buf);
67 int isamd_pp_num (ISAMD_PP pp);
69 int isamd_block_used (ISAMD is, int type);
70 int isamd_block_size (ISAMD is, int type);
73 #define isamd_type(x) ((x) & 7)
74 #define isamd_block(x) ((x) >> 3)
75 #define isamd_addr(blk,typ) (((blk)<<3)+(typ))
77 void isamd_buildfirstblock(ISAMD_PP pp);
78 void isamd_buildlaterblock(ISAMD_PP pp);
89 * Revision 1.2 1999/07/14 13:21:34 heikki
90 * Added isam-d files. Compiles (almost) clean. Doesn't work at all
92 * Revision 1.1 1999/07/14 12:34:43 heikki
93 * Copied from isamh, starting to change things...