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)
239 fb->offset += (-fb->offset) & (alignment - 1);
240 chunk = g_slice_new (FileChunk);
241 chunk->offset = fb->offset;
243 chunk->data = g_malloc (size);
245 pointer->start = guint32_to_le (fb->offset);
247 pointer->end = guint32_to_le (fb->offset);
249 g_queue_push_tail (fb->chunks, chunk);
255 file_builder_add_value (FileBuilder *fb,
257 struct gvdb_pointer *pointer)
259 GVariant *variant, *normal;
265 value = g_variant_byteswap (value);
266 variant = g_variant_new_variant (value);
267 g_variant_unref (value);
270 variant = g_variant_new_variant (value);
272 normal = g_variant_get_normal_form (variant);
273 g_variant_unref (variant);
275 size = g_variant_get_size (normal);
276 data = file_builder_allocate (fb, 8, size, pointer);
277 g_variant_store (normal, data);
278 g_variant_unref (normal);
282 file_builder_add_options (FileBuilder *fb,
284 struct gvdb_pointer *pointer)
294 options = g_variant_byteswap (options);
295 normal = g_variant_get_normal_form (options);
296 g_variant_unref (options);
299 normal = g_variant_get_normal_form (options);
301 size = g_variant_get_size (normal);
302 data = file_builder_allocate (fb, 8, size, pointer);
303 g_variant_store (normal, data);
304 g_variant_unref (normal);
309 file_builder_add_string (FileBuilder *fb,
317 length = strlen (string);
319 chunk = g_slice_new (FileChunk);
320 chunk->offset = fb->offset;
321 chunk->size = length;
322 chunk->data = g_malloc (length);
323 memcpy (chunk->data, string, length);
325 *start = guint32_to_le (fb->offset);
326 *size = guint16_to_le (length);
327 fb->offset += length;
329 g_queue_push_tail (fb->chunks, chunk);
333 file_builder_allocate_for_hash (FileBuilder *fb,
338 guint32_le **bloom_filter,
339 guint32_le **hash_buckets,
340 struct gvdb_hash_item **hash_items,
341 struct gvdb_pointer *pointer)
343 guint32_le bloom_hdr, table_hdr;
347 g_assert (n_bloom_words < (1u << 27));
349 bloom_hdr = guint32_to_le (bloom_shift << 27 | n_bloom_words);
350 table_hdr = guint32_to_le (n_buckets);
352 size = sizeof bloom_hdr + sizeof table_hdr +
353 n_bloom_words * sizeof (guint32_le) +
354 n_buckets * sizeof (guint32_le) +
355 n_items * sizeof (struct gvdb_hash_item);
357 data = file_builder_allocate (fb, 4, size, pointer);
359 #define chunk(s) (size -= (s), data += (s), data - (s))
360 memcpy (chunk (sizeof bloom_hdr), &bloom_hdr, sizeof bloom_hdr);
361 memcpy (chunk (sizeof table_hdr), &table_hdr, sizeof table_hdr);
362 *bloom_filter = (guint32_le *) chunk (n_bloom_words * sizeof (guint32_le));
363 *hash_buckets = (guint32_le *) chunk (n_buckets * sizeof (guint32_le));
364 *hash_items = (struct gvdb_hash_item *) chunk (n_items *
365 sizeof (struct gvdb_hash_item));
366 g_assert (size == 0);
369 memset (*bloom_filter, 0, n_bloom_words * sizeof (guint32_le));
373 file_builder_add_hash (FileBuilder *fb,
375 struct gvdb_pointer *pointer)
377 guint32_le *buckets, *bloom_filter;
378 struct gvdb_hash_item *items;
384 mytable = hash_table_new (g_hash_table_size (table));
385 g_hash_table_foreach (table, hash_table_insert, mytable);
388 for (bucket = 0; bucket < mytable->n_buckets; bucket++)
389 for (item = mytable->buckets[bucket]; item; item = item->next)
390 item->assigned_index = guint32_to_le (index++);
392 file_builder_allocate_for_hash (fb, mytable->n_buckets, index, 5, 0,
393 &bloom_filter, &buckets, &items, pointer);
396 for (bucket = 0; bucket < mytable->n_buckets; bucket++)
398 buckets[bucket] = guint32_to_le (index);
400 for (item = mytable->buckets[bucket]; item; item = item->next)
402 struct gvdb_hash_item *entry = items++;
403 const gchar *basename;
405 g_assert (index == guint32_from_le (item->assigned_index));
406 entry->hash_value = guint32_to_le (item->hash_value);
407 entry->parent = item_to_index (item->parent);
410 if (item->parent != NULL)
411 basename = item->key + strlen (item->parent->key);
413 basename = item->key;
415 file_builder_add_string (fb, basename,
419 if (item->value != NULL)
421 g_assert (item->child == NULL && item->table == NULL);
423 file_builder_add_value (fb, item->value, &entry->value.pointer);
424 file_builder_add_options (fb, item->options, &entry->options);
428 if (item->child != NULL)
430 guint32 children = 0;
434 g_assert (item->table == NULL);
436 for (child = item->child; child; child = child->sibling)
439 offsets = file_builder_allocate (fb, 4, 4 * children,
440 &entry->value.pointer);
443 for (child = item->child; child; child = child->sibling)
444 offsets[--children] = child->assigned_index;
446 g_assert (children == 0);
449 if (item->table != NULL)
452 file_builder_add_hash (fb, item->table, &entry->value.pointer);
461 file_builder_new (gboolean byteswap)
463 FileBuilder *builder;
465 builder = g_slice_new (FileBuilder);
466 builder->chunks = g_queue_new ();
467 builder->offset = sizeof (struct gvdb_header);
468 builder->byteswap = byteswap;
474 file_builder_serialise (FileBuilder *fb,
475 struct gvdb_pointer root)
477 struct gvdb_header header;
482 header.signature[0] = GVDB_SWAPPED_SIGNATURE0;
483 header.signature[1] = GVDB_SWAPPED_SIGNATURE1;
487 header.signature[0] = GVDB_SIGNATURE0;
488 header.signature[1] = GVDB_SIGNATURE1;
491 result = g_string_new (NULL);
494 g_string_append_len (result, (gpointer) &header, sizeof header);
496 while (!g_queue_is_empty (fb->chunks))
498 FileChunk *chunk = g_queue_pop_head (fb->chunks);
500 if (result->len != chunk->offset)
502 gchar zero[8] = { 0, };
504 g_assert (chunk->offset > result->len);
505 g_assert (chunk->offset - result->len < 8);
507 g_string_append_len (result, zero, chunk->offset - result->len);
508 g_assert (result->len == chunk->offset);
511 g_string_append_len (result, chunk->data, chunk->size);
512 g_free (chunk->data);
515 g_queue_free (fb->chunks);
516 g_slice_free (FileBuilder, fb);
522 gvdb_table_write_contents (GHashTable *table,
523 const gchar *filename,
527 struct gvdb_pointer root;
532 fb = file_builder_new (byteswap);
533 file_builder_add_hash (fb, table, &root);
534 str = file_builder_serialise (fb, root);
536 status = g_file_set_contents (filename, str->str, str->len, error);
537 g_string_free (str, TRUE);