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;
53 gvdb_item_free (gpointer data)
55 GvdbItem *item = data;
60 g_variant_unref (item->value);
63 g_hash_table_unref (item->table);
65 g_slice_free (GvdbItem, item);
69 gvdb_hash_table_new (GHashTable *parent,
70 const gchar *name_in_parent)
74 table = g_hash_table_new_full (g_str_hash, g_str_equal,
75 g_free, gvdb_item_free);
81 item = gvdb_hash_table_insert (parent, name_in_parent);
82 gvdb_item_set_hash_table (item, table);
89 djb_hash (const gchar *key)
91 guint32 hash_value = 5381;
94 hash_value = hash_value * 33 + *key++;
100 gvdb_hash_table_insert (GHashTable *table,
105 item = g_slice_new0 (GvdbItem);
106 item->key = g_strdup (key);
107 item->hash_value = djb_hash (key);
109 g_hash_table_insert (table, g_strdup (key), item);
115 gvdb_hash_table_insert_string (GHashTable *table,
121 item = gvdb_hash_table_insert (table, key);
122 gvdb_item_set_value (item, g_variant_new_string (value));
126 gvdb_item_set_value (GvdbItem *item,
129 g_return_if_fail (!item->value && !item->table && !item->child);
131 item->value = g_variant_ref_sink (value);
135 gvdb_item_set_hash_table (GvdbItem *item,
138 g_return_if_fail (!item->value && !item->table && !item->child);
140 item->table = g_hash_table_ref (table);
144 gvdb_item_set_parent (GvdbItem *item,
149 g_return_if_fail (g_str_has_prefix (item->key, parent->key));
150 g_return_if_fail (!parent->value && !parent->table);
151 g_return_if_fail (!item->parent && !item->sibling);
153 for (node = &parent->child; *node; node = &(*node)->sibling)
154 if (strcmp ((*node)->key, item->key) > 0)
157 item->parent = parent;
158 item->sibling = *node;
169 hash_table_new (gint n_buckets)
173 table = g_slice_new (HashTable);
174 table->buckets = g_new0 (GvdbItem *, n_buckets);
175 table->n_buckets = n_buckets;
181 hash_table_insert (gpointer key,
185 guint32 hash_value, bucket;
186 HashTable *table = data;
187 GvdbItem *item = value;
189 hash_value = djb_hash (key);
190 bucket = hash_value % table->n_buckets;
191 item->next = table->buckets[bucket];
192 table->buckets[bucket] = item;
196 item_to_index (GvdbItem *item)
199 return item->assigned_index;
201 return guint32_to_le (-1u);
219 file_builder_allocate (FileBuilder *fb,
222 struct gvdb_pointer *pointer)
229 fb->offset += (-fb->offset) & (alignment - 1);
230 chunk = g_slice_new (FileChunk);
231 chunk->offset = fb->offset;
233 chunk->data = g_malloc (size);
235 pointer->start = guint32_to_le (fb->offset);
237 pointer->end = guint32_to_le (fb->offset);
239 g_queue_push_tail (fb->chunks, chunk);
245 file_builder_add_value (FileBuilder *fb,
247 struct gvdb_pointer *pointer)
249 GVariant *variant, *normal;
255 value = g_variant_byteswap (value);
256 variant = g_variant_new_variant (value);
257 g_variant_unref (value);
260 variant = g_variant_new_variant (value);
262 normal = g_variant_get_normal_form (variant);
263 g_variant_unref (variant);
265 size = g_variant_get_size (normal);
266 data = file_builder_allocate (fb, 8, size, pointer);
267 g_variant_store (normal, data);
268 g_variant_unref (normal);
272 file_builder_add_string (FileBuilder *fb,
280 length = strlen (string);
282 chunk = g_slice_new (FileChunk);
283 chunk->offset = fb->offset;
284 chunk->size = length;
285 chunk->data = g_malloc (length);
286 memcpy (chunk->data, string, length);
288 *start = guint32_to_le (fb->offset);
289 *size = guint16_to_le (length);
290 fb->offset += length;
292 g_queue_push_tail (fb->chunks, chunk);
296 file_builder_allocate_for_hash (FileBuilder *fb,
301 guint32_le **bloom_filter,
302 guint32_le **hash_buckets,
303 struct gvdb_hash_item **hash_items,
304 struct gvdb_pointer *pointer)
306 guint32_le bloom_hdr, table_hdr;
310 g_assert (n_bloom_words < (1u << 27));
312 bloom_hdr = guint32_to_le (bloom_shift << 27 | n_bloom_words);
313 table_hdr = guint32_to_le (n_buckets);
315 size = sizeof bloom_hdr + sizeof table_hdr +
316 n_bloom_words * sizeof (guint32_le) +
317 n_buckets * sizeof (guint32_le) +
318 n_items * sizeof (struct gvdb_hash_item);
320 data = file_builder_allocate (fb, 4, size, pointer);
322 #define chunk(s) (size -= (s), data += (s), data - (s))
323 memcpy (chunk (sizeof bloom_hdr), &bloom_hdr, sizeof bloom_hdr);
324 memcpy (chunk (sizeof table_hdr), &table_hdr, sizeof table_hdr);
325 *bloom_filter = (guint32_le *) chunk (n_bloom_words * sizeof (guint32_le));
326 *hash_buckets = (guint32_le *) chunk (n_buckets * sizeof (guint32_le));
327 *hash_items = (struct gvdb_hash_item *) chunk (n_items *
328 sizeof (struct gvdb_hash_item));
329 g_assert (size == 0);
332 memset (*bloom_filter, 0, n_bloom_words * sizeof (guint32_le));
336 file_builder_add_hash (FileBuilder *fb,
338 struct gvdb_pointer *pointer)
340 guint32_le *buckets, *bloom_filter;
341 struct gvdb_hash_item *items;
347 mytable = hash_table_new (g_hash_table_size (table));
348 g_hash_table_foreach (table, hash_table_insert, mytable);
351 for (bucket = 0; bucket < mytable->n_buckets; bucket++)
352 for (item = mytable->buckets[bucket]; item; item = item->next)
353 item->assigned_index = guint32_to_le (index++);
355 file_builder_allocate_for_hash (fb, mytable->n_buckets, index, 5, 0,
356 &bloom_filter, &buckets, &items, pointer);
359 for (bucket = 0; bucket < mytable->n_buckets; bucket++)
361 buckets[bucket] = guint32_to_le (index);
363 for (item = mytable->buckets[bucket]; item; item = item->next)
365 struct gvdb_hash_item *entry = items++;
366 const gchar *basename;
368 g_assert (index == guint32_from_le (item->assigned_index));
369 entry->hash_value = guint32_to_le (item->hash_value);
370 entry->parent = item_to_index (item->parent);
373 if (item->parent != NULL)
374 basename = item->key + strlen (item->parent->key);
376 basename = item->key;
378 file_builder_add_string (fb, basename,
382 if (item->value != NULL)
384 g_assert (item->child == NULL && item->table == NULL);
386 file_builder_add_value (fb, item->value, &entry->value.pointer);
390 if (item->child != NULL)
392 guint32 children = 0, i = 0;
396 g_assert (item->table == NULL);
398 for (child = item->child; child; child = child->sibling)
401 offsets = file_builder_allocate (fb, 4, 4 * children,
402 &entry->value.pointer);
405 for (child = item->child; child; child = child->sibling)
406 offsets[i++] = child->assigned_index;
408 g_assert (children == i);
411 if (item->table != NULL)
414 file_builder_add_hash (fb, item->table, &entry->value.pointer);
423 file_builder_new (gboolean byteswap)
425 FileBuilder *builder;
427 builder = g_slice_new (FileBuilder);
428 builder->chunks = g_queue_new ();
429 builder->offset = sizeof (struct gvdb_header);
430 builder->byteswap = byteswap;
436 file_builder_serialise (FileBuilder *fb,
437 struct gvdb_pointer root)
439 struct gvdb_header header = { { 0, }, };
444 header.signature[0] = GVDB_SWAPPED_SIGNATURE0;
445 header.signature[1] = GVDB_SWAPPED_SIGNATURE1;
449 header.signature[0] = GVDB_SIGNATURE0;
450 header.signature[1] = GVDB_SIGNATURE1;
453 result = g_string_new (NULL);
456 g_string_append_len (result, (gpointer) &header, sizeof header);
458 while (!g_queue_is_empty (fb->chunks))
460 FileChunk *chunk = g_queue_pop_head (fb->chunks);
462 if (result->len != chunk->offset)
464 gchar zero[8] = { 0, };
466 g_assert (chunk->offset > result->len);
467 g_assert (chunk->offset - result->len < 8);
469 g_string_append_len (result, zero, chunk->offset - result->len);
470 g_assert (result->len == chunk->offset);
473 g_string_append_len (result, chunk->data, chunk->size);
474 g_free (chunk->data);
477 g_queue_free (fb->chunks);
478 g_slice_free (FileBuilder, fb);
484 gvdb_table_write_contents (GHashTable *table,
485 const gchar *filename,
489 struct gvdb_pointer root;
494 fb = file_builder_new (byteswap);
495 file_builder_add_hash (fb, table, &root);
496 str = file_builder_serialise (fb, root);
498 status = g_file_set_contents (filename, str->str, str->len, error);
499 g_string_free (str, TRUE);