lsm/mdbtools
1
0
Fork 0
mirror of https://github.com/mdbtools/mdbtools.git synced 2026-03-10 00:20:54 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

usage map stuff

Browse Source
This commit is contained in:
brianb
2002-12-20 06:17:41 +00:00
parent 0cf1a2242d
commit 66380f5958
3 changed files with 79 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
src/libmdb/data.c
View File

@@ -21,6 +21,8 @@
#include "time.h"
#include "math.h"
//#define FAST_READ 1
char *mdb_money_to_string(MdbHandle *mdb, int start, char *s);
static int _mdb_attempt_bind(MdbHandle *mdb,
MdbColumn *col, unsigned char isnull, int offset, int len);
@@ -342,12 +344,34 @@ int mdb_read_next_dpg(MdbTableDef *table)
MdbCatalogEntry *entry = table->entry;
MdbHandle *mdb = entry->mdb;
#if FAST_READ
int pgnum, i, bitn;
pgnum = _mdb_get_int32(table->usage_map,1);
/* the first 5 bytes of the usage map mean something */
for (i=5;i<table->map_sz;i++) {
for (bitn=0;bitn<8;bitn++) {
if (table->usage_map[i] & 1 << bitn && pgnum > table->cur_phys_pg) {
table->cur_phys_pg = pgnum;
if (!mdb_read_pg(mdb, pgnum)) {
return 0;
} else {
return pgnum;
}
}
pgnum++;
}
}
/* didn't find anything */
return 0;
#else
do {
if (!mdb_read_pg(mdb, table->cur_phys_pg++))
return 0;
} while (mdb->pg_buf[0]!=0x01 || mdb_get_int32(mdb, 4)!=entry->table_pg);
/* fprintf(stderr,"returning new page %ld\n", table->cur_phys_pg); */
return table->cur_phys_pg;
#endif
}
int mdb_rewind_table(MdbTableDef *table)
{
@@ -418,6 +442,17 @@ int mdb_is_fixed_col(MdbColumn *col)
{
return col->is_fixed;
}
static char *mdb_data_to_hex(MdbHandle *mdb, char *text, int start, int size)
{
int i;
for (i=start; i<start+size; i++) {
sprintf(&text[(i-start)*2],"%02x", mdb->pg_buf[i]);
}
text[(i-start)*2]='\0';
return text;
}
static char *mdb_memo_to_string(MdbHandle *mdb, int start, int size)
{
guint16 memo_len;
@@ -577,6 +612,7 @@ char *mdb_col_to_string(MdbHandle *mdb, int start, int datatype, int size)
{
/* FIX ME -- not thread safe */
static char text[MDB_BIND_SIZE];
char tmpbuf[10];
time_t t;
int i,j;