static gpointer
file_builder_allocate (FileBuilder *fb,
guint alignment,
gsize size,
struct gvdb_pointer *pointer)
{
FileChunk *chunk;
if (size == 0)
return NULL;
fb->offset += (-fb->offset) & (alignment - 1);
chunk = g_slice_new (FileChunk);
chunk->offset = fb->offset;
chunk->size = size;
chunk->data = g_malloc (size);
pointer->start = guint32_to_le (fb->offset);
fb->offset += size;
pointer->end = guint32_to_le (fb->offset);
g_queue_push_tail (fb->chunks, chunk);
return chunk->data;
}
static void
file_builder_allocate_for_hash (FileBuilder *fb,
gsize n_buckets,
gsize n_items,
guint bloom_shift,
gsize n_bloom_words,
guint32_le **bloom_filter,
guint32_le **hash_buckets,
struct gvdb_hash_item **hash_items,
struct gvdb_pointer *pointer)
{
guint32_le bloom_hdr, table_hdr;
guchar *data;
gsize size;
g_assert (n_bloom_words < (1u << 27));
bloom_hdr = guint32_to_le (bloom_shift << 27 | n_bloom_words);
table_hdr = guint32_to_le (n_buckets);
size = sizeof bloom_hdr + sizeof table_hdr +
n_bloom_words * sizeof (guint32_le) +
n_buckets * sizeof (guint32_le) +
n_items * sizeof (struct gvdb_hash_item);
data = file_builder_allocate (fb, 4, size, pointer);
#define chunk(s) (size -= (s), data += (s), data - (s))
memcpy (chunk (sizeof bloom_hdr), &bloom_hdr, sizeof bloom_hdr);
memcpy (chunk (sizeof table_hdr), &table_hdr, sizeof table_hdr);
*bloom_filter = (guint32_le *) chunk (n_bloom_words * sizeof (guint32_le));
*hash_buckets = (guint32_le *) chunk (n_buckets * sizeof (guint32_le));
*hash_items = (struct gvdb_hash_item *) chunk (n_items *
sizeof (struct gvdb_hash_item));
g_assert (size == 0);
#undef chunk
memset (*bloom_filter, 0, n_bloom_words * sizeof (guint32_le));
/* NOTE - the code to actually fill in the bloom filter here is missing.
* Patches welcome!
*
* http://en.wikipedia.org/wiki/Bloom_filter
* http://0pointer.de/blog/projects/bloom.html
*/
}
static guint32_le
item_to_index (GvdbItem *item)
{
if (item != NULL)
return item->assigned_index;
return guint32_to_le (-1u);
}
static void
file_builder_allocate_for_hash (FileBuilder *fb,
gsize n_buckets,
gsize n_items,
guint bloom_shift,
gsize n_bloom_words,
guint32_le **bloom_filter,
guint32_le **hash_buckets,
struct gvdb_hash_item **hash_items,
struct gvdb_pointer *pointer)
{
guint32_le bloom_hdr, table_hdr;
guchar *data;
gsize size;
g_assert (n_bloom_words < (1u << 27));
bloom_hdr = guint32_to_le (bloom_shift << 27 | n_bloom_words);
table_hdr = guint32_to_le (n_buckets);
size = sizeof bloom_hdr + sizeof table_hdr +
n_bloom_words * sizeof (guint32_le) +
n_buckets * sizeof (guint32_le) +
n_items * sizeof (struct gvdb_hash_item);
data = file_builder_allocate (fb, 4, size, pointer);
#define chunk(s) (size -= (s), data += (s), data - (s))
memcpy (chunk (sizeof bloom_hdr), &bloom_hdr, sizeof bloom_hdr);
memcpy (chunk (sizeof table_hdr), &table_hdr, sizeof table_hdr);
*bloom_filter = (guint32_le *) chunk (n_bloom_words * sizeof (guint32_le));
*hash_buckets = (guint32_le *) chunk (n_buckets * sizeof (guint32_le));
*hash_items = (struct gvdb_hash_item *) chunk (n_items *
sizeof (struct gvdb_hash_item));
g_assert (size == 0);
#undef chunk
memset (*bloom_filter, 0, n_bloom_words * sizeof (guint32_le));
}
static void
file_builder_add_string (FileBuilder *fb,
const gchar *string,
guint32_le *start,
guint16_le *size)
{
FileChunk *chunk;
gsize length;
length = strlen (string);
chunk = g_slice_new (FileChunk);
chunk->offset = fb->offset;
chunk->size = length;
chunk->data = g_malloc (length);
memcpy (chunk->data, string, length);
*start = guint32_to_le (fb->offset);
*size = guint16_to_le (length);
fb->offset += length;
g_queue_push_tail (fb->chunks, chunk);
}
static void
file_builder_add_hash (FileBuilder *fb,
GHashTable *table,
struct gvdb_pointer *pointer)
{
guint32_le *buckets, *bloom_filter;
struct gvdb_hash_item *items;
HashTable *mytable;
GvdbItem *item;
guint32 index;
gint bucket;
mytable = hash_table_new (g_hash_table_size (table));
g_hash_table_foreach (table, hash_table_insert, mytable);
index = 0;
for (bucket = 0; bucket < mytable->n_buckets; bucket++)
for (item = mytable->buckets[bucket]; item; item = item->next)
item->assigned_index = guint32_to_le (index++);
file_builder_allocate_for_hash (fb, mytable->n_buckets, index, 5, 0,
&bloom_filter, &buckets, &items, pointer);
index = 0;
for (bucket = 0; bucket < mytable->n_buckets; bucket++)
{
buckets[bucket] = guint32_to_le (index);
for (item = mytable->buckets[bucket]; item; item = item->next)
{
struct gvdb_hash_item *entry = items++;
const gchar *basename;
g_assert (index == guint32_from_le (item->assigned_index));
entry->hash_value = guint32_to_le (item->hash_value);
entry->parent = item_to_index (item->parent);
entry->unused = 0;
if (item->parent != NULL)
basename = item->key + strlen (item->parent->key);
else
basename = item->key;
file_builder_add_string (fb, basename,
&entry->key_start,
&entry->key_size);
if (item->value != NULL)
{
g_assert (item->child == NULL && item->table == NULL);
file_builder_add_value (fb, item->value, &entry->value.pointer);
entry->type = 'v';
}
if (item->child != NULL)
{
guint32 children = 0, i = 0;
guint32_le *offsets;
GvdbItem *child;
g_assert (item->table == NULL);
for (child = item->child; child; child = child->sibling)
children++;
offsets = file_builder_allocate (fb, 4, 4 * children,
&entry->value.pointer);
entry->type = 'L';
for (child = item->child; child; child = child->sibling)
offsets[i++] = child->assigned_index;
g_assert (children == i);
}
if (item->table != NULL)
{
entry->type = 'H';
file_builder_add_hash (fb, item->table, &entry->value.pointer);
}
index++;
}
}
hash_table_free (mytable);
}