--- /dev/null
+/* TDB tools to create various canned database layouts. */
+#include "layout.h"
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+struct tdb_layout *new_tdb_layout(void)
+{
+ struct tdb_layout *layout = malloc(sizeof(*layout));
+ layout->num_elems = 0;
+ layout->elem = NULL;
+ layout->ftable = layout->htable = -1;
+ return layout;
+}
+
+static void add(struct tdb_layout *layout, union tdb_layout_elem elem)
+{
+ layout->elem = realloc(layout->elem,
+ sizeof(layout->elem[0])
+ * (layout->num_elems+1));
+ layout->elem[layout->num_elems++] = elem;
+}
+
+void tdb_layout_add_free(struct tdb_layout *layout, tdb_len_t len)
+{
+ union tdb_layout_elem elem;
+ elem.base.type = FREE;
+ elem.free.len = len;
+ add(layout, elem);
+}
+
+static struct tdb_data dup_key(struct tdb_data key)
+{
+ struct tdb_data ret;
+ ret.dsize = key.dsize;
+ ret.dptr = malloc(ret.dsize);
+ memcpy(ret.dptr, key.dptr, ret.dsize);
+ return ret;
+}
+
+void tdb_layout_add_used(struct tdb_layout *layout,
+ TDB_DATA key, TDB_DATA data,
+ tdb_len_t extra)
+{
+ union tdb_layout_elem elem;
+ elem.base.type = DATA;
+ elem.used.key = dup_key(key);
+ elem.used.data = dup_key(data);
+ elem.used.extra = extra;
+ add(layout, elem);
+}
+
+void tdb_layout_add_hashtable(struct tdb_layout *layout,
+ unsigned int hash_bits,
+ tdb_len_t extra)
+{
+ union tdb_layout_elem elem;
+ elem.base.type = HASHTABLE;
+ elem.hashtable.hash_bits = hash_bits;
+ elem.hashtable.extra = extra;
+ assert(layout->htable == -1U);
+ layout->htable = layout->num_elems;
+ add(layout, elem);
+}
+
+void tdb_layout_add_freetable(struct tdb_layout *layout,
+ unsigned int num_zones,
+ unsigned int zone_bits,
+ unsigned int num_buckets,
+ tdb_len_t extra)
+{
+ union tdb_layout_elem elem;
+ elem.base.type = FREETABLE;
+ elem.freetable.num_zones = num_zones;
+ elem.freetable.zone_bits = zone_bits;
+ elem.freetable.num_buckets = num_buckets;
+ elem.freetable.extra = extra;
+ assert(layout->ftable == -1U);
+ layout->ftable = layout->num_elems;
+ add(layout, elem);
+}
+
+static tdb_len_t free_record_len(tdb_len_t len)
+{
+ return sizeof(struct tdb_used_record) + len;
+}
+
+static tdb_len_t data_record_len(struct tle_used *used)
+{
+ tdb_len_t len;
+ len = sizeof(struct tdb_used_record)
+ + used->key.dsize + used->data.dsize + used->extra;
+ assert(len >= sizeof(struct tdb_free_record));
+ return len;
+}
+
+static tdb_len_t hashtable_len(struct tle_hashtable *htable)
+{
+ return sizeof(struct tdb_used_record)
+ + (sizeof(tdb_off_t) << htable->hash_bits);
+}
+
+static tdb_len_t freetable_len(struct tle_freetable *ftable)
+{
+ return sizeof(struct tdb_used_record)
+ + (sizeof(tdb_off_t) * ftable->num_zones
+ * (ftable->num_buckets + 1));
+}
+
+static void set_free_record(void *mem, tdb_len_t len)
+{
+ /* We do all the work in add_to_freetable */
+}
+
+static void set_data_record(void *mem, struct tdb_context *tdb,
+ struct tle_used *used)
+{
+ struct tdb_used_record *u = mem;
+
+ set_header(tdb, u, used->key.dsize, used->data.dsize,
+ used->key.dsize + used->data.dsize + used->extra,
+ tdb_hash(tdb, used->key.dptr, used->key.dsize));
+ memcpy(u + 1, used->key.dptr, used->key.dsize);
+ memcpy((char *)(u + 1) + used->key.dsize,
+ used->data.dptr, used->data.dsize);
+}
+
+static void set_hashtable(void *mem, struct tdb_context *tdb,
+ struct tle_hashtable *htable)
+{
+ struct tdb_used_record *u = mem;
+ tdb_len_t len = sizeof(tdb_off_t) << htable->hash_bits;
+
+ set_header(tdb, u, 0, len, len + htable->extra, 0);
+ memset(u + 1, 0, len);
+}
+
+static void set_freetable(void *mem, struct tdb_context *tdb,
+ struct tle_freetable *ftable)
+{
+ struct tdb_used_record *u = mem;
+ tdb_len_t len = sizeof(tdb_off_t) * ftable->num_zones
+ * (ftable->num_buckets + 1);
+ set_header(tdb, u, 0, len, len + ftable->extra, 0);
+ memset(u + 1, 0, len);
+}
+
+static void add_to_freetable(struct tdb_context *tdb,
+ tdb_off_t eoff,
+ tdb_off_t elen)
+{
+ add_free_record(tdb, eoff, sizeof(struct tdb_used_record) + elen);
+}
+
+static tdb_off_t hash_off(struct tdb_context *tdb, uint64_t list)
+{
+ return tdb->header.v.hash_off
+ + ((list & ((1ULL << tdb->header.v.hash_bits) - 1))
+ * sizeof(tdb_off_t));
+}
+
+static void add_to_hashtable(struct tdb_context *tdb,
+ tdb_off_t eoff,
+ struct tdb_data key)
+{
+ uint64_t hash = tdb_hash(tdb, key.dptr, key.dsize);
+ tdb_off_t hoff;
+
+ while (tdb_read_off(tdb, hoff = hash_off(tdb, hash)) != 0)
+ hash++;
+
+ tdb_write_off(tdb, hoff, eoff);
+}
+
+/* FIXME: Support TDB_CONVERT */
+struct tdb_context *tdb_layout_get(struct tdb_layout *layout)
+{
+ unsigned int i;
+ tdb_off_t len;
+ struct tdb_header *hdr;
+ char *mem;
+ struct tdb_context *tdb;
+
+ assert(layout->ftable != -1U);
+ assert(layout->htable != -1U);
+
+ len = sizeof(struct tdb_header);
+
+ /* First pass of layout: calc lengths */
+ for (i = 0; i < layout->num_elems; i++) {
+ union tdb_layout_elem *e = &layout->elem[i];
+ e->base.off = len;
+ switch (e->base.type) {
+ case FREE:
+ len += free_record_len(e->free.len);
+ break;
+ case DATA:
+ len += data_record_len(&e->used);
+ break;
+ case HASHTABLE:
+ len += hashtable_len(&e->hashtable);
+ break;
+ case FREETABLE:
+ len += freetable_len(&e->freetable);
+ break;
+ }
+ }
+
+ mem = malloc(len);
+ /* Now populate our header, cribbing from a real TDB header. */
+ tdb = tdb_open(NULL, TDB_INTERNAL, O_RDWR, 0, NULL);
+ hdr = (void *)mem;
+ *hdr = tdb->header;
+ hdr->v.generation++;
+ hdr->v.num_zones = layout->elem[layout->ftable].freetable.num_zones;
+ hdr->v.zone_bits = layout->elem[layout->ftable].freetable.zone_bits;
+ hdr->v.free_buckets
+ = layout->elem[layout->ftable].freetable.num_buckets;
+ hdr->v.free_off = layout->elem[layout->ftable].base.off
+ + sizeof(struct tdb_used_record);
+ hdr->v.hash_bits = layout->elem[layout->htable].hashtable.hash_bits;
+ hdr->v.hash_off = layout->elem[layout->htable].base.off
+ + sizeof(struct tdb_used_record);
+
+ /* Mug the tdb we have to make it use this. */
+ free(tdb->map_ptr);
+ tdb->map_ptr = mem;
+ tdb->map_size = len;
+ header_changed(tdb);
+
+ for (i = 0; i < layout->num_elems; i++) {
+ union tdb_layout_elem *e = &layout->elem[i];
+ switch (e->base.type) {
+ case FREE:
+ set_free_record(mem + e->base.off, e->free.len);
+ break;
+ case DATA:
+ set_data_record(mem + e->base.off, tdb, &e->used);
+ break;
+ case HASHTABLE:
+ set_hashtable(mem + e->base.off, tdb, &e->hashtable);
+ break;
+ case FREETABLE:
+ set_freetable(mem + e->base.off, tdb, &e->freetable);
+ break;
+ }
+ }
+
+ /* Now fill the free and hash tables. */
+ for (i = 0; i < layout->num_elems; i++) {
+ union tdb_layout_elem *e = &layout->elem[i];
+ switch (e->base.type) {
+ case FREE:
+ add_to_freetable(tdb, e->base.off, e->free.len);
+ break;
+ case DATA:
+ add_to_hashtable(tdb, e->base.off, e->used.key);
+ break;
+ default:
+ break;
+ }
+ }
+
+ return tdb;
+}
projects / ccan-lca-2011.git / blobdiff