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usage map stuff

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brianb
2002-12-20 06:17:41 +00:00
parent 0cf1a2242d
commit 66380f5958
3 changed files with 79 additions and 4 deletions
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31
src/libmdb/table.c
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@@ -43,6 +43,7 @@ MdbTableDef *mdb_read_table(MdbCatalogEntry *entry)
MdbTableDef *table;
MdbHandle *mdb = entry->mdb;
int len, i;
int rownum, row_start, row_end;
table = mdb_alloc_tabledef(entry);
@@ -53,6 +54,22 @@ int len, i;
table->num_cols = mdb_get_int16(mdb, mdb->tab_num_cols_offset);
table->num_idxs = mdb_get_int32(mdb, mdb->tab_num_idxs_offset);
table->num_real_idxs = mdb_get_int32(mdb, mdb->tab_num_ridxs_offset);
/* grab a copy of the usage map */
rownum = mdb->pg_buf[mdb->tab_usage_map_offset];
mdb_read_alt_pg(mdb, mdb_get_int24(mdb, mdb->tab_usage_map_offset + 1));
mdb_swap_pgbuf(mdb);
row_start = mdb_get_int16(mdb, (mdb->row_count_offset + 2) + (rownum*2));
row_end = mdb_find_end_of_row(mdb, rownum);
table->map_sz = row_end - row_start;
table->usage_map = malloc(table->map_sz);
memcpy(table->usage_map, &mdb->pg_buf[row_start], table->map_sz);
buffer_dump(mdb->pg_buf, row_start, row_end);
/* swap back */
mdb_swap_pgbuf(mdb);
printf ("usage map found on page %ld start %d end %d\n", mdb_get_int24(mdb, mdb->tab_usage_map_offset + 1), row_start, row_end);
table->first_data_pg = mdb_get_int16(mdb, mdb->tab_first_dpg_offset);
return table;
@@ -208,7 +225,8 @@ MdbTableDef *table;
MdbColumn *col;
MdbIndex *idx;
MdbHandle *mdb = entry->mdb;
int i;
int i,bitn;
int pgnum;
table = mdb_read_table(entry);
fprintf(stdout,"definition page = %d\n",entry->table_pg);
@@ -233,4 +251,15 @@ int i;
idx = g_ptr_array_index (table->indices, i);
mdb_index_dump(table, idx);
}
if (table->usage_map) {
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)
printf("page %ld is reserved by this object\n",pgnum);
pgnum++;
}
}
}
}