swish-e/src/btree.h

/* */


typedef struct BTREE_Page
{
    unsigned long      next;    /* Next Page */
    unsigned long      prev;    /* Previous Page */
    unsigned int       size;    /* Size of page */
    unsigned int       n;       /* Number of keys in page */
    unsigned int       flags;
    unsigned int       data_end;

    unsigned long      page_number;
    int                modified;
    int                in_use;

    struct BTREE_Page  *next_cache;

    unsigned char data[0];        /* Page data */
} BTREE_Page;

#define BTREE_CACHE_SIZE 97

typedef struct BTREE
{
    unsigned long root_page;
    int page_size;
    struct BTREE_Page *cache[BTREE_CACHE_SIZE];
    int levels;
    unsigned long tree[1024];
          /* Values for sequential reading */
    unsigned long current_page;
    unsigned long current_position;

    FILE *fp;
} BTREE;

BTREE *BTREE_Create(FILE *fp, unsigned int size);
BTREE *BTREE_Open(FILE *fp, int size, unsigned long root_page);
unsigned long BTREE_Close(BTREE *bt);
int BTREE_Insert(BTREE *b, unsigned char *key, int key_len, unsigned long data_pointer);
long BTREE_Search(BTREE *b, unsigned char *key, int key_len, unsigned char **found, int *found_len, int exact_match);
long BTREE_Next(BTREE *b, unsigned char **found, int *found_len);
int BTREE_Update(BTREE *b, unsigned char *key, int key_len, unsigned long new_data_pointer);


1	/* */
2
3
4	typedef struct BTREE_Page
5	{
6	unsigned long next; /* Next Page */
7	unsigned long prev; /* Previous Page */
8	unsigned int size; /* Size of page */
9	unsigned int n; /* Number of keys in page */
10	unsigned int flags;
11	unsigned int data_end;
12
13	unsigned long page_number;
14	int modified;
15	int in_use;
16
17	struct BTREE_Page *next_cache;
18
19	unsigned char data[0]; /* Page data */
20	} BTREE_Page;
21
22	#define BTREE_CACHE_SIZE 97
23
24	typedef struct BTREE
25	{
26	unsigned long root_page;
27	int page_size;
28	struct BTREE_Page *cache[BTREE_CACHE_SIZE];
29	int levels;
30	unsigned long tree[1024];
31	/* Values for sequential reading */
32	unsigned long current_page;
33	unsigned long current_position;
34
35	FILE *fp;
36	} BTREE;
37
38	BTREE BTREE_Create(FILE fp, unsigned int size);
39	BTREE BTREE_Open(FILE fp, int size, unsigned long root_page);
40	unsigned long BTREE_Close(BTREE *bt);
41	int BTREE_Insert(BTREE b, unsigned char key, int key_len, unsigned long data_pointer);
42	long BTREE_Search(BTREE b, unsigned char key, int key_len, unsigned char *found, int found_len, int exact_match);
43	long BTREE_Next(BTREE b, unsigned char found, int found_len);
44	int BTREE_Update(BTREE b, unsigned char key, int key_len, unsigned long new_data_pointer);
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