From fc6b96707730c54fb7ac4040680d79864169b5e0 Mon Sep 17 00:00:00 2001
From: John Mark Bell <jmb@netsurf-browser.org>
Date: Mon, 27 Jul 2009 19:38:34 +0000
Subject: Calculate the in-memory size of stylesheets and provide some API to
 access this.

svn path=/trunk/libcss/; revision=8830
---
 src/select/hash.c | 29 +++++++++++++++++++++++++++++
 src/select/hash.h |  2 ++
 2 files changed, 31 insertions(+)

(limited to 'src/select')

diff --git a/src/select/hash.c b/src/select/hash.c
index 9bcfb15..df6ce4e 100644
--- a/src/select/hash.c
+++ b/src/select/hash.c
@@ -25,6 +25,8 @@ struct css_selector_hash {
 
 	lwc_context *ctx;
 
+	size_t hash_size;
+
 	css_allocator_fn alloc;
 	void *pw;
 };
@@ -65,6 +67,9 @@ css_error css_selector_hash_create(lwc_context *dict,
 	memset(h->slots, 0, DEFAULT_SLOTS * sizeof(hash_entry));
 	h->n_slots = DEFAULT_SLOTS;
 
+	h->hash_size = sizeof(css_selector_hash) + 
+			DEFAULT_SLOTS * sizeof(hash_entry);
+
 	h->ctx = lwc_context_ref(dict);
 	h->alloc = alloc;
 	h->pw = pw;
@@ -163,6 +168,8 @@ css_error css_selector_hash_insert(css_selector_hash *hash,
 			entry->next = prev->next;
 			prev->next = entry;
 		}
+
+		hash->hash_size += sizeof(hash_entry);
 	}
 
 	return CSS_OK;
@@ -216,6 +223,8 @@ css_error css_selector_hash_remove(css_selector_hash *hash,
 		prev->next = head->next;
 
 		hash->alloc(head, 0, hash->pw);
+
+		hash->hash_size -= sizeof(hash_entry);
 	}
 
 	return CSS_OK;
@@ -317,6 +326,26 @@ css_error css_selector_hash_iterate(css_selector_hash *hash,
 	return CSS_OK;
 }
 
+/**
+ * Determine the memory-resident size of a hash
+ *
+ * \param hash  Hash to consider
+ * \param size  Pointer to location to receive byte count
+ * \return CSS_OK on success.
+ *
+ * \note The returned size will represent the size of the hash datastructures,
+ *       and will not include the size of the data stored in the hash.
+ */
+css_error css_selector_hash_size(css_selector_hash *hash, size_t *size)
+{
+	if (hash == NULL || size == NULL)
+		return CSS_BADPARM;
+
+	*size = hash->hash_size;
+
+	return CSS_OK;
+}
+
 /******************************************************************************
  * Private functions                                                          *
  ******************************************************************************/
diff --git a/src/select/hash.h b/src/select/hash.h
index 59c8b76..9beaa6b 100644
--- a/src/select/hash.h
+++ b/src/select/hash.h
@@ -35,5 +35,7 @@ css_error css_selector_hash_iterate(css_selector_hash *hash,
 		const struct css_selector **current, 
 		const struct css_selector ***next);
 
+css_error css_selector_hash_size(css_selector_hash *hash, size_t *size);
+
 #endif
 
-- 
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