2 * Copyright (c) 1995-2000, 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
22 typedef struct ISAMD_s *ISAMD;
24 typedef struct ISAMD_PP_s *ISAMD_PP;
26 typedef struct ISAMD_filecat_s { /* filecategories, mostly block sizes */
27 int bsize; /* block size */
28 int mblocks; /* maximum keys before switching to larger sizes */
31 typedef struct ISAMD_M_s {
32 ISAMD_filecat filecat;
34 int (*compare_item)(const void *a, const void *b);
36 #define ISAMD_DECODE 0
37 #define ISAMD_ENCODE 1
38 void *(*code_start)(int mode);
39 void (*code_stop)(int mode, void *p);
40 void (*code_item)(int mode, void *p, char **dst, char **src);
41 void (*code_reset)(void *p);
47 typedef struct ISAMD_I_s { /* encapsulation of input data */
48 int (*read_item)(void *clientData, char **dst, int *insertMode);
52 ISAMD_M isamd_getmethod (ISAMD_M me);
54 ISAMD isamd_open (BFiles bfs, const char *name, int writeflag, ISAMD_M method);
55 int isamd_close (ISAMD is);
56 ISAMD_P isamd_append (ISAMD is, ISAMD_P pos, ISAMD_I data);
57 /* corresponds to isc_merge */
60 ISAMD_PP isamd_pp_open (ISAMD is, ISAMD_P pos);
61 void isamd_pp_close (ISAMD_PP pp);
62 int isamd_read_item (ISAMD_PP pp, char **dst);
63 int isamd_read_main_item (ISAMD_PP pp, char **dst);
64 int isamd_pp_read (ISAMD_PP pp, void *buf);
65 int isamd_pp_num (ISAMD_PP pp);
67 int isamd_block_used (ISAMD is, int type);
68 int isamd_block_size (ISAMD is, int type);
71 #define isamd_type(x) ((x) & 7)
72 #define isamd_block(x) ((x) >> 3)
73 #define isamd_addr(blk,typ) (((blk)<<3)+(typ))
75 void isamd_buildfirstblock(ISAMD_PP pp);
76 void isamd_buildlaterblock(ISAMD_PP pp);
85 * Revision 1.3 1999/08/18 08:33:41 heikki
88 * Revision 1.2 1999/07/14 13:21:34 heikki
89 * Added isam-d files. Compiles (almost) clean. Doesn't work at all
91 * Revision 1.1 1999/07/14 12:34:43 heikki
92 * Copied from isamh, starting to change things...