2 * Copyright © 2010 Codethink Limited
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the licence, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
19 * Author: Ryan Lortie <desrt@desrt.ca>
22 #include "gvdb-builder.h"
23 #include "gvdb-format.h"
35 guint32_le assigned_index;
54 gvdb_item_free (gpointer data)
56 GvdbItem *item = data;
61 g_variant_unref (item->value);
64 g_variant_unref (item->options);
67 g_hash_table_unref (item->table);
69 g_slice_free (GvdbItem, item);
73 gvdb_hash_table_new (GHashTable *parent,
74 const gchar *name_in_parent)
78 table = g_hash_table_new_full (g_str_hash, g_str_equal,
79 g_free, gvdb_item_free);
85 item = gvdb_hash_table_insert (parent, name_in_parent);
86 gvdb_item_set_hash_table (item, table);
93 djb_hash (const gchar *key)
95 guint32 hash_value = 5381;
98 hash_value = hash_value * 33 + *key++;
104 gvdb_hash_table_insert (GHashTable *table,
109 item = g_slice_new0 (GvdbItem);
110 item->key = g_strdup (key);
111 item->hash_value = djb_hash (key);
113 g_hash_table_insert (table, g_strdup (key), item);
119 gvdb_hash_table_insert_string (GHashTable *table,
125 item = gvdb_hash_table_insert (table, key);
126 gvdb_item_set_value (item, g_variant_new_string (value));
130 gvdb_item_set_value (GvdbItem *item,
133 g_return_if_fail (!item->value && !item->table && !item->child);
135 item->value = g_variant_ref_sink (value);
139 gvdb_item_set_options (GvdbItem *item,
142 g_return_if_fail (!item->options);
144 item->options = g_variant_ref_sink (options);
148 gvdb_item_set_hash_table (GvdbItem *item,
151 g_return_if_fail (!item->value && !item->table && !item->child);
153 item->table = g_hash_table_ref (table);
157 gvdb_item_set_parent (GvdbItem *item,
162 g_return_if_fail (g_str_has_prefix (item->key, parent->key));
163 g_return_if_fail (!parent->value && !parent->table);
164 g_return_if_fail (!item->parent && !item->sibling);
166 for (node = &parent->child; *node; node = &(*node)->sibling)
167 if (strcmp ((*node)->key, item->key) > 0)
170 item->parent = parent;
171 item->sibling = *node;
182 hash_table_new (gint n_buckets)
186 table = g_slice_new (HashTable);
187 table->buckets = g_new0 (GvdbItem *, n_buckets);
188 table->n_buckets = n_buckets;
194 hash_table_insert (gpointer key,
198 guint32 hash_value, bucket;
199 HashTable *table = data;
200 GvdbItem *item = value;
202 hash_value = djb_hash (key);
203 bucket = hash_value % table->n_buckets;
204 item->next = table->buckets[bucket];
205 table->buckets[bucket] = item;
209 item_to_index (GvdbItem *item)
212 return item->assigned_index;
214 return guint32_to_le (-1u);
232 file_builder_allocate (FileBuilder *fb,
235 struct gvdb_pointer *pointer)
242 fb->offset += (-fb->offset) & (alignment - 1);
243 chunk = g_slice_new (FileChunk);
244 chunk->offset = fb->offset;
246 chunk->data = g_malloc (size);
248 pointer->start = guint32_to_le (fb->offset);
250 pointer->end = guint32_to_le (fb->offset);
252 g_queue_push_tail (fb->chunks, chunk);
258 file_builder_add_value (FileBuilder *fb,
260 struct gvdb_pointer *pointer)
262 GVariant *variant, *normal;
268 value = g_variant_byteswap (value);
269 variant = g_variant_new_variant (value);
270 g_variant_unref (value);
273 variant = g_variant_new_variant (value);
275 normal = g_variant_get_normal_form (variant);
276 g_variant_unref (variant);
278 size = g_variant_get_size (normal);
279 data = file_builder_allocate (fb, 8, size, pointer);
280 g_variant_store (normal, data);
281 g_variant_unref (normal);
285 file_builder_add_options (FileBuilder *fb,
287 struct gvdb_pointer *pointer)
297 options = g_variant_byteswap (options);
298 normal = g_variant_get_normal_form (options);
299 g_variant_unref (options);
302 normal = g_variant_get_normal_form (options);
304 size = g_variant_get_size (normal);
305 data = file_builder_allocate (fb, 8, size, pointer);
306 g_variant_store (normal, data);
307 g_variant_unref (normal);
312 file_builder_add_string (FileBuilder *fb,
320 length = strlen (string);
322 chunk = g_slice_new (FileChunk);
323 chunk->offset = fb->offset;
324 chunk->size = length;
325 chunk->data = g_malloc (length);
326 memcpy (chunk->data, string, length);
328 *start = guint32_to_le (fb->offset);
329 *size = guint16_to_le (length);
330 fb->offset += length;
332 g_queue_push_tail (fb->chunks, chunk);
336 file_builder_allocate_for_hash (FileBuilder *fb,
341 guint32_le **bloom_filter,
342 guint32_le **hash_buckets,
343 struct gvdb_hash_item **hash_items,
344 struct gvdb_pointer *pointer)
346 guint32_le bloom_hdr, table_hdr;
350 g_assert (n_bloom_words < (1u << 27));
352 bloom_hdr = guint32_to_le (bloom_shift << 27 | n_bloom_words);
353 table_hdr = guint32_to_le (n_buckets);
355 size = sizeof bloom_hdr + sizeof table_hdr +
356 n_bloom_words * sizeof (guint32_le) +
357 n_buckets * sizeof (guint32_le) +
358 n_items * sizeof (struct gvdb_hash_item);
360 data = file_builder_allocate (fb, 4, size, pointer);
362 #define chunk(s) (size -= (s), data += (s), data - (s))
363 memcpy (chunk (sizeof bloom_hdr), &bloom_hdr, sizeof bloom_hdr);
364 memcpy (chunk (sizeof table_hdr), &table_hdr, sizeof table_hdr);
365 *bloom_filter = (guint32_le *) chunk (n_bloom_words * sizeof (guint32_le));
366 *hash_buckets = (guint32_le *) chunk (n_buckets * sizeof (guint32_le));
367 *hash_items = (struct gvdb_hash_item *) chunk (n_items *
368 sizeof (struct gvdb_hash_item));
369 g_assert (size == 0);
372 memset (*bloom_filter, 0, n_bloom_words * sizeof (guint32_le));
376 file_builder_add_hash (FileBuilder *fb,
378 struct gvdb_pointer *pointer)
380 guint32_le *buckets, *bloom_filter;
381 struct gvdb_hash_item *items;
387 mytable = hash_table_new (g_hash_table_size (table));
388 g_hash_table_foreach (table, hash_table_insert, mytable);
391 for (bucket = 0; bucket < mytable->n_buckets; bucket++)
392 for (item = mytable->buckets[bucket]; item; item = item->next)
393 item->assigned_index = guint32_to_le (index++);
395 file_builder_allocate_for_hash (fb, mytable->n_buckets, index, 5, 0,
396 &bloom_filter, &buckets, &items, pointer);
399 for (bucket = 0; bucket < mytable->n_buckets; bucket++)
401 buckets[bucket] = guint32_to_le (index);
403 for (item = mytable->buckets[bucket]; item; item = item->next)
405 struct gvdb_hash_item *entry = items++;
406 const gchar *basename;
408 g_assert (index == guint32_from_le (item->assigned_index));
409 entry->hash_value = guint32_to_le (item->hash_value);
410 entry->parent = item_to_index (item->parent);
413 if (item->parent != NULL)
414 basename = item->key + strlen (item->parent->key);
416 basename = item->key;
418 file_builder_add_string (fb, basename,
422 if (item->value != NULL)
424 g_assert (item->child == NULL && item->table == NULL);
426 file_builder_add_value (fb, item->value, &entry->value.pointer);
427 file_builder_add_options (fb, item->options, &entry->options);
431 if (item->child != NULL)
433 guint32 children = 0;
437 g_assert (item->table == NULL);
439 for (child = item->child; child; child = child->sibling)
442 offsets = file_builder_allocate (fb, 4, 4 * children,
443 &entry->value.pointer);
446 for (child = item->child; child; child = child->sibling)
447 offsets[--children] = child->assigned_index;
449 g_assert (children == 0);
452 if (item->table != NULL)
455 file_builder_add_hash (fb, item->table, &entry->value.pointer);
464 file_builder_new (gboolean byteswap)
466 FileBuilder *builder;
468 builder = g_slice_new (FileBuilder);
469 builder->chunks = g_queue_new ();
470 builder->offset = sizeof (struct gvdb_header);
471 builder->byteswap = byteswap;
477 file_builder_serialise (FileBuilder *fb,
478 struct gvdb_pointer root)
480 struct gvdb_header header = { { 0, }, };
485 header.signature[0] = GVDB_SWAPPED_SIGNATURE0;
486 header.signature[1] = GVDB_SWAPPED_SIGNATURE1;
490 header.signature[0] = GVDB_SIGNATURE0;
491 header.signature[1] = GVDB_SIGNATURE1;
494 result = g_string_new (NULL);
497 g_string_append_len (result, (gpointer) &header, sizeof header);
499 while (!g_queue_is_empty (fb->chunks))
501 FileChunk *chunk = g_queue_pop_head (fb->chunks);
503 if (result->len != chunk->offset)
505 gchar zero[8] = { 0, };
507 g_assert (chunk->offset > result->len);
508 g_assert (chunk->offset - result->len < 8);
510 g_string_append_len (result, zero, chunk->offset - result->len);
511 g_assert (result->len == chunk->offset);
514 g_string_append_len (result, chunk->data, chunk->size);
515 g_free (chunk->data);
518 g_queue_free (fb->chunks);
519 g_slice_free (FileBuilder, fb);
525 gvdb_table_write_contents (GHashTable *table,
526 const gchar *filename,
530 struct gvdb_pointer root;
535 fb = file_builder_new (byteswap);
536 file_builder_add_hash (fb, table, &root);
537 str = file_builder_serialise (fb, root);
539 status = g_file_set_contents (filename, str->str, str->len, error);
540 g_string_free (str, TRUE);