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"
27 #if !defined(G_OS_WIN32) || !defined(_MSC_VER)
37 guint32_le assigned_index;
55 gvdb_item_free (gpointer data)
57 GvdbItem *item = data;
62 g_variant_unref (item->value);
65 g_hash_table_unref (item->table);
67 g_slice_free (GvdbItem, item);
71 gvdb_hash_table_new (GHashTable *parent,
72 const gchar *name_in_parent)
76 table = g_hash_table_new_full (g_str_hash, g_str_equal,
77 g_free, gvdb_item_free);
83 item = gvdb_hash_table_insert (parent, name_in_parent);
84 gvdb_item_set_hash_table (item, table);
91 djb_hash (const gchar *key)
93 guint32 hash_value = 5381;
96 hash_value = hash_value * 33 + *(signed char *)key++;
102 gvdb_hash_table_insert (GHashTable *table,
107 item = g_slice_new0 (GvdbItem);
108 item->key = g_strdup (key);
109 item->hash_value = djb_hash (key);
111 g_hash_table_insert (table, g_strdup (key), item);
117 gvdb_hash_table_insert_string (GHashTable *table,
123 item = gvdb_hash_table_insert (table, key);
124 gvdb_item_set_value (item, g_variant_new_string (value));
128 gvdb_item_set_value (GvdbItem *item,
131 g_return_if_fail (!item->value && !item->table && !item->child);
133 item->value = g_variant_ref_sink (value);
137 gvdb_item_set_hash_table (GvdbItem *item,
140 g_return_if_fail (!item->value && !item->table && !item->child);
142 item->table = g_hash_table_ref (table);
146 gvdb_item_set_parent (GvdbItem *item,
151 g_return_if_fail (g_str_has_prefix (item->key, parent->key));
152 g_return_if_fail (!parent->value && !parent->table);
153 g_return_if_fail (!item->parent && !item->sibling);
155 for (node = &parent->child; *node; node = &(*node)->sibling)
156 if (strcmp ((*node)->key, item->key) > 0)
159 item->parent = parent;
160 item->sibling = *node;
171 hash_table_new (gint n_buckets)
175 table = g_slice_new (HashTable);
176 table->buckets = g_new0 (GvdbItem *, n_buckets);
177 table->n_buckets = n_buckets;
183 hash_table_free (HashTable *table)
185 g_free (table->buckets);
187 g_slice_free (HashTable, table);
191 hash_table_insert (gpointer key,
195 guint32 hash_value, bucket;
196 HashTable *table = data;
197 GvdbItem *item = value;
199 hash_value = djb_hash (key);
200 bucket = hash_value % table->n_buckets;
201 item->next = table->buckets[bucket];
202 table->buckets[bucket] = item;
206 item_to_index (GvdbItem *item)
209 return item->assigned_index;
211 return guint32_to_le (-1u);
229 file_builder_allocate (FileBuilder *fb,
232 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_string (FileBuilder *fb,
290 length = strlen (string);
292 chunk = g_slice_new (FileChunk);
293 chunk->offset = fb->offset;
294 chunk->size = length;
295 chunk->data = g_malloc (length);
296 memcpy (chunk->data, string, length);
298 *start = guint32_to_le (fb->offset);
299 *size = guint16_to_le (length);
300 fb->offset += length;
302 g_queue_push_tail (fb->chunks, chunk);
306 file_builder_allocate_for_hash (FileBuilder *fb,
311 guint32_le **bloom_filter,
312 guint32_le **hash_buckets,
313 struct gvdb_hash_item **hash_items,
314 struct gvdb_pointer *pointer)
316 guint32_le bloom_hdr, table_hdr;
320 g_assert (n_bloom_words < (1u << 27));
322 bloom_hdr = guint32_to_le (bloom_shift << 27 | n_bloom_words);
323 table_hdr = guint32_to_le (n_buckets);
325 size = sizeof bloom_hdr + sizeof table_hdr +
326 n_bloom_words * sizeof (guint32_le) +
327 n_buckets * sizeof (guint32_le) +
328 n_items * sizeof (struct gvdb_hash_item);
330 data = file_builder_allocate (fb, 4, size, pointer);
332 #define chunk(s) (size -= (s), data += (s), data - (s))
333 memcpy (chunk (sizeof bloom_hdr), &bloom_hdr, sizeof bloom_hdr);
334 memcpy (chunk (sizeof table_hdr), &table_hdr, sizeof table_hdr);
335 *bloom_filter = (guint32_le *) chunk (n_bloom_words * sizeof (guint32_le));
336 *hash_buckets = (guint32_le *) chunk (n_buckets * sizeof (guint32_le));
337 *hash_items = (struct gvdb_hash_item *) chunk (n_items *
338 sizeof (struct gvdb_hash_item));
339 g_assert (size == 0);
342 memset (*bloom_filter, 0, n_bloom_words * sizeof (guint32_le));
346 file_builder_add_hash (FileBuilder *fb,
348 struct gvdb_pointer *pointer)
350 guint32_le *buckets, *bloom_filter;
351 struct gvdb_hash_item *items;
357 mytable = hash_table_new (g_hash_table_size (table));
358 g_hash_table_foreach (table, hash_table_insert, mytable);
361 for (bucket = 0; bucket < mytable->n_buckets; bucket++)
362 for (item = mytable->buckets[bucket]; item; item = item->next)
363 item->assigned_index = guint32_to_le (index++);
365 file_builder_allocate_for_hash (fb, mytable->n_buckets, index, 5, 0,
366 &bloom_filter, &buckets, &items, pointer);
369 for (bucket = 0; bucket < mytable->n_buckets; bucket++)
371 buckets[bucket] = guint32_to_le (index);
373 for (item = mytable->buckets[bucket]; item; item = item->next)
375 struct gvdb_hash_item *entry = items++;
376 const gchar *basename;
378 g_assert (index == guint32_from_le (item->assigned_index));
379 entry->hash_value = guint32_to_le (item->hash_value);
380 entry->parent = item_to_index (item->parent);
383 if (item->parent != NULL)
384 basename = item->key + strlen (item->parent->key);
386 basename = item->key;
388 file_builder_add_string (fb, basename,
392 if (item->value != NULL)
394 g_assert (item->child == NULL && item->table == NULL);
396 file_builder_add_value (fb, item->value, &entry->value.pointer);
400 if (item->child != NULL)
402 guint32 children = 0, i = 0;
406 g_assert (item->table == NULL);
408 for (child = item->child; child; child = child->sibling)
411 offsets = file_builder_allocate (fb, 4, 4 * children,
412 &entry->value.pointer);
415 for (child = item->child; child; child = child->sibling)
416 offsets[i++] = child->assigned_index;
418 g_assert (children == i);
421 if (item->table != NULL)
424 file_builder_add_hash (fb, item->table, &entry->value.pointer);
431 hash_table_free (mytable);
435 file_builder_new (gboolean byteswap)
437 FileBuilder *builder;
439 builder = g_slice_new (FileBuilder);
440 builder->chunks = g_queue_new ();
441 builder->offset = sizeof (struct gvdb_header);
442 builder->byteswap = byteswap;
448 file_builder_serialise (FileBuilder *fb,
449 struct gvdb_pointer root)
451 struct gvdb_header header = { { 0, }, };
456 header.signature[0] = GVDB_SWAPPED_SIGNATURE0;
457 header.signature[1] = GVDB_SWAPPED_SIGNATURE1;
461 header.signature[0] = GVDB_SIGNATURE0;
462 header.signature[1] = GVDB_SIGNATURE1;
465 result = g_string_new (NULL);
468 g_string_append_len (result, (gpointer) &header, sizeof header);
470 while (!g_queue_is_empty (fb->chunks))
472 FileChunk *chunk = g_queue_pop_head (fb->chunks);
474 if (result->len != chunk->offset)
476 gchar zero[8] = { 0, };
478 g_assert (chunk->offset > result->len);
479 g_assert (chunk->offset - result->len < 8);
481 g_string_append_len (result, zero, chunk->offset - result->len);
482 g_assert (result->len == chunk->offset);
485 g_string_append_len (result, chunk->data, chunk->size);
486 g_free (chunk->data);
488 g_slice_free (FileChunk, chunk);
491 g_queue_free (fb->chunks);
492 g_slice_free (FileBuilder, fb);
498 gvdb_table_write_contents (GHashTable *table,
499 const gchar *filename,
503 struct gvdb_pointer root;
508 fb = file_builder_new (byteswap);
509 file_builder_add_hash (fb, table, &root);
510 str = file_builder_serialise (fb, root);
512 status = g_file_set_contents (filename, str->str, str->len, error);
513 g_string_free (str, TRUE);