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Commit 4bef6770 authored by Alexandre Julliard's avatar Alexandre Julliard
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Changed atom handling to use counted strings instead of

null-terminated ones, avoiding the need for a temporary buffer.
parent 0e378b82
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Showing with 71 additions and 63 deletions
server/atom.c
View file @ 4bef6770
......@@ -46,9 +46,10 @@ struct atom_entry
struct atom_entry *next; /* hash table list */
struct atom_entry *prev; /* hash table list */
int count; /* reference count */
int pinned; /* whether the atom is pinned or not */
int hash; /* string hash */
short pinned; /* whether the atom is pinned or not */
atom_t atom; /* atom handle */
unsigned short hash; /* string hash */
unsigned short len; /* string len */
WCHAR str[1]; /* atom string */
};
......@@ -81,24 +82,6 @@ static const struct object_ops atom_table_ops =
static struct atom_table *global_table;
/* copy an atom name from the request to a temporary area */
static const WCHAR *copy_request_name(void)
{
static WCHAR buffer[MAX_ATOM_LEN+1];
const WCHAR *str = get_req_data();
size_t len = get_req_data_size();
if (len > MAX_ATOM_LEN*sizeof(WCHAR))
{
set_error( STATUS_INVALID_PARAMETER );
return NULL;
}
memcpy( buffer, str, len );
buffer[len / sizeof(WCHAR)] = 0;
return buffer;
}
/* create an atom table */
static struct atom_table *create_table(int entries_count)
{
......@@ -165,11 +148,11 @@ static atom_t add_atom_entry( struct atom_table *table, struct atom_entry *entry
}
/* compute the hash code for a string */
static int atom_hash( struct atom_table *table, const WCHAR *str )
static unsigned short atom_hash( struct atom_table *table, const WCHAR *str, size_t len )
{
int i;
WCHAR hash = 0;
for (i = 0; str[i]; i++) hash ^= toupperW(str[i]) + i;
unsigned int i;
unsigned short hash = 0;
for (i = 0; i < len; i++) hash ^= toupperW(str[i]) + i;
return hash % table->entries_count;
}
......@@ -189,7 +172,7 @@ static void atom_table_dump( struct object *obj, int verbose )
if (!entry) continue;
fprintf( stderr, " %04x: ref=%d pinned=%c hash=%d \"",
entry->atom, entry->count, entry->pinned ? 'Y' : 'N', entry->hash );
dump_strW( entry->str, strlenW( entry->str ), stderr, "\"\"");
dump_strW( entry->str, entry->len, stderr, "\"\"");
fprintf( stderr, "\"\n" );
}
}
......@@ -209,12 +192,13 @@ static void atom_table_destroy( struct object *obj )
}
/* find an atom entry in its hash list */
static struct atom_entry *find_atom_entry( struct atom_table *table, const WCHAR *str, int hash )
static struct atom_entry *find_atom_entry( struct atom_table *table, const WCHAR *str,
size_t len, unsigned short hash )
{
struct atom_entry *entry = table->entries[hash];
while (entry)
{
if (!strcmpiW( entry->str, str )) break;
if (entry->len == len && !memicmpW( entry->str, str, len )) break;
entry = entry->next;
}
return entry;
......@@ -227,24 +211,29 @@ void close_atom_table(void)
}
/* add an atom to the table */
static atom_t add_atom( struct atom_table *table, const WCHAR *str )
static atom_t add_atom( struct atom_table *table, const WCHAR *str, size_t len )
{
struct atom_entry *entry;
int hash = atom_hash( table, str );
unsigned short hash = atom_hash( table, str, len );
atom_t atom = 0;
if (!*str)
if (!len)
{
set_error( STATUS_OBJECT_NAME_INVALID );
return 0;
}
if ((entry = find_atom_entry( table, str, hash ))) /* exists already */
if (len > MAX_ATOM_LEN)
{
set_error( STATUS_INVALID_PARAMETER );
return 0;
}
if ((entry = find_atom_entry( table, str, len, hash ))) /* exists already */
{
entry->count++;
return entry->atom;
}
if ((entry = mem_alloc( sizeof(*entry) + strlenW(str) * sizeof(WCHAR) )))
if ((entry = mem_alloc( sizeof(*entry) + (len - 1) * sizeof(WCHAR) )))
{
if ((atom = add_atom_entry( table, entry )))
{
......@@ -254,7 +243,8 @@ static atom_t add_atom( struct atom_table *table, const WCHAR *str )
entry->count = 1;
entry->pinned = 0;
entry->hash = hash;
strcpyW( entry->str, str );
entry->len = len;
memcpy( entry->str, str, len * sizeof(WCHAR) );
}
else free( entry );
}
......@@ -277,14 +267,49 @@ static void delete_atom( struct atom_table *table, atom_t atom )
}
/* find an atom in the table */
static atom_t find_atom( struct atom_table *table, const WCHAR *str )
static atom_t find_atom( struct atom_table *table, const WCHAR *str, size_t len )
{
struct atom_entry *entry;
if (!len)
{
set_error( STATUS_OBJECT_NAME_INVALID );
return 0;
}
if (len > MAX_ATOM_LEN)
{
set_error( STATUS_INVALID_PARAMETER );
return 0;
}
if (table && (entry = find_atom_entry( table, str, len, atom_hash(table, str, len) )))
return entry->atom;
set_error( STATUS_OBJECT_NAME_NOT_FOUND );
return 0;
}
static struct atom_table* get_table( obj_handle_t h )
{
if (h) return (struct atom_table *)get_handle_obj( current->process, h, 0, &atom_table_ops );
if (!global_table && !(global_table = create_table( HASH_SIZE ))) return NULL;
return (struct atom_table *)grab_object( global_table );
}
/* add an atom in the global table; used for window properties */
atom_t add_global_atom( const WCHAR *str, size_t len )
{
if (!global_table && !(global_table = create_table( HASH_SIZE ))) return 0;
return add_atom( global_table, str, len );
}
/* find an atom in the global table; used for window properties */
atom_t find_global_atom( const WCHAR *str, size_t len )
{
struct atom_entry *entry;
if (table && ((entry = find_atom_entry( table, str, atom_hash(table, str) ))))
if (!len || len > MAX_ATOM_LEN || !global_table) return 0;
if ((entry = find_atom_entry( global_table, str, len, atom_hash(global_table, str, len) )))
return entry->atom;
if (!*str) set_error( STATUS_OBJECT_NAME_INVALID );
else set_error( STATUS_OBJECT_NAME_NOT_FOUND );
return 0;
}
......@@ -306,32 +331,13 @@ void release_global_atom( atom_t atom )
if (atom >= MIN_STR_ATOM) delete_atom( global_table, atom );
}
static struct atom_table* get_table( obj_handle_t h )
{
struct atom_table *table;
if (h)
{
table = (struct atom_table*)get_handle_obj( current->process, h,
0, &atom_table_ops );
}
else
{
if (!global_table && !(global_table = create_table( HASH_SIZE )))
return NULL;
table = (struct atom_table*)grab_object( global_table );
}
return table;
}
/* add a global atom */
DECL_HANDLER(add_atom)
{
struct atom_table *table = get_table( req->table );
if (table)
{
const WCHAR *name = copy_request_name();
if (name) reply->atom = add_atom( table, name );
reply->atom = add_atom( table, get_req_data(), get_req_data_size() / sizeof(WCHAR) );
release_object( table );
}
}
......@@ -353,9 +359,7 @@ DECL_HANDLER(find_atom)
struct atom_table *table = get_table( req->table );
if (table)
{
const WCHAR *name = copy_request_name();
if (name)
reply->atom = find_atom( table, name );
reply->atom = find_atom( table, get_req_data(), get_req_data_size() / sizeof(WCHAR) );
release_object( table );
}
}
......@@ -370,7 +374,7 @@ DECL_HANDLER(get_atom_information)
if ((entry = get_atom_entry( table, req->atom )))
{
size_t len = strlenW( entry->str ) * sizeof(WCHAR);
size_t len = entry->len * sizeof(WCHAR);
if (len <= get_reply_max_size()) set_reply_data( entry->str, len );
else set_error( STATUS_BUFFER_OVERFLOW );
reply->count = entry->count;
......@@ -400,11 +404,13 @@ DECL_HANDLER(set_atom_information)
/* init a (local) atom table */
DECL_HANDLER(init_atom_table)
{
struct atom_table* table;
struct atom_table* table = create_table( req->entries );
table = create_table( req->entries );
if (table)
{
reply->table = alloc_handle( current->process, table, 0, FALSE);
release_object( table );
}
}
/* set global atom name */
......
server/object.h
View file @ 4bef6770
......@@ -155,6 +155,8 @@ extern void close_signals(void);
/* atom functions */
extern void close_atom_table(void);
extern atom_t add_global_atom( const WCHAR *str, size_t len );
extern atom_t find_global_atom( const WCHAR *str, size_t len );
extern int grab_global_atom( atom_t atom );
extern void release_global_atom( atom_t atom );
......
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