* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. *****************************************************************************/
+#if !defined( __LIBVLC__ )
+ #error You are not libvlc or one of its plugins. You cannot include this file
+#endif
+
#ifndef _VLC_ARRAYS_H_
#define _VLC_ARRAYS_H_
+#include <assert.h>
+
/**
* Simple dynamic array handling. Array is realloced at each insert/removal
*/
} \
while( 0 )
+#define TAB_INIT( count, tab ) \
+ do { \
+ (count) = 0; \
+ (tab) = NULL; \
+ } while(0)
-#define TAB_APPEND( count, tab, p ) \
+#define TAB_CLEAN( count, tab ) \
+ do { \
+ if( tab ) free( tab ); \
+ (count)= 0; \
+ (tab)= NULL; \
+ } while(0)
+
+#define TAB_APPEND_CAST( cast, count, tab, p ) \
+ do { \
if( (count) > 0 ) \
- { \
- (tab) = realloc( tab, sizeof( void ** ) * ( (count) + 1 ) ); \
- } \
+ (tab) = cast realloc( tab, sizeof( void ** ) * ( (count) + 1 ) ); \
else \
- { \
- (tab) = malloc( sizeof( void ** ) ); \
- } \
- (tab)[count] = (p); \
- (count)++
+ (tab) = cast malloc( sizeof( void ** ) ); \
+ (tab)[count] = (p); \
+ (count)++; \
+ } while(0)
+
+#define TAB_APPEND( count, tab, p ) \
+ TAB_APPEND_CAST( , count, tab, p )
+#define TAB_APPEND_CPP( type, count, tab, p ) \
+ TAB_APPEND_CAST( (type**), count, tab, p )
#define TAB_FIND( count, tab, p, index ) \
- { \
+ do { \
int _i_; \
(index) = -1; \
for( _i_ = 0; _i_ < (count); _i_++ ) \
{ \
- if( (tab)[_i_] == (p) ) \
+ if( (tab)[_i_] == (p) ) \
{ \
(index) = _i_; \
break; \
} \
} \
- }
+ } while(0)
#define TAB_REMOVE( count, tab, p ) \
- { \
+ do { \
int _i_index_; \
TAB_FIND( count, tab, p, _i_index_ ); \
if( _i_index_ >= 0 ) \
{ \
- if( (count) > 1 ) \
+ if( (count) > 1 ) \
{ \
memmove( ((void**)(tab) + _i_index_), \
((void**)(tab) + _i_index_+1), \
(tab) = NULL; \
} \
} \
- }
+ } while(0)
+
+#define TAB_INSERT_CAST( cast, count, tab, p, index ) do { \
+ if( (count) > 0 ) \
+ (tab) = cast realloc( tab, sizeof( void ** ) * ( (count) + 1 ) ); \
+ else \
+ (tab) = cast malloc( sizeof( void ** ) ); \
+ if( (count) - (index) > 0 ) \
+ memmove( (void**)(tab) + (index) + 1, \
+ (void**)(tab) + (index), \
+ ((count) - (index)) * sizeof(*(tab)) );\
+ (tab)[(index)] = (p); \
+ (count)++; \
+} while(0)
+
+#define TAB_INSERT( count, tab, p, index ) \
+ TAB_INSERT_CAST( , count, tab, p, index )
/**
- * Binary search in an array
+ * Binary search in a sorted array. The key must be comparable by < and >
* \param entries array of entries
* \param count number of entries
* \param elem key to check within an entry (like .id, or ->i_id)
* \param key value of the key
* \param answer index of answer within the array. -1 if not found
*/
-#define BSEARCH( entries, count, elem, zetype, key, answer ) { \
+#define BSEARCH( entries, count, elem, zetype, key, answer ) \
+ do { \
int low = 0, high = count - 1; \
answer = -1; \
while( low <= high ) {\
answer = mid; break; \
}\
} \
-}
-
-/* Dictionnary handling */
-struct dict_entry_t
-{
- int i_int;
- char *psz_string;
- uint64_t i_hash;
- void *p_data;
-};
-
-struct dict_t
-{
- dict_entry_t *p_entries;
- int i_entries;
-};
-
-VLC_EXPORT( dict_t *, vlc_DictNew, (void) );
-VLC_EXPORT( void, vlc_DictClear, (dict_t * ) );
-VLC_EXPORT( void, vlc_DictInsert, (dict_t *, int, const char *, void * ) );
-VLC_EXPORT( void*, vlc_DictGet, (dict_t *, int, const char * ) );
-VLC_EXPORT( int, vlc_DictLookup, (dict_t *, int, const char * ) );
+ } while(0)
/************************************************************************
************************************************************************/
/* Internal functions */
-//printf("Realloc from %i to %i\n", array.i_alloc, newsize);
#define _ARRAY_ALLOC(array, newsize) { \
array.i_alloc = newsize; \
array.p_elems = VLCCVP realloc( array.p_elems, array.i_alloc * \
array.i_size = 0; \
array.p_elems = NULL;
+#define ARRAY_RESET(array) \
+ array.i_alloc = 0; \
+ array.i_size = 0; \
+ free( array.p_elems ); array.p_elems = NULL;
+
#define ARRAY_APPEND(array, elem) { \
_ARRAY_GROW1(array); \
array.p_elems[array.i_size] = elem; \
_ARRAY_SHRINK(array); \
}
+#define ARRAY_VAL(array, pos) array.p_elems[pos]
+
+#define ARRAY_BSEARCH(array, elem, zetype, key, answer) \
+ BSEARCH( array.p_elems, array.i_size, elem, zetype, key, answer)
+
+#define FOREACH_ARRAY( item, array ) { \
+ int fe_idx; \
+ for( fe_idx = 0 ; fe_idx < array.i_size ; fe_idx++ ) \
+ { \
+ item = array.p_elems[fe_idx];
+
+#define FOREACH_END() } }
+
+/************************************************************************
+ * Dictionaries
+ ************************************************************************/
+
+/* This function is not intended to be crypto-secure, we only want it to be
+ * fast and not suck too much. This one is pretty fast and did 0 collisions
+ * in wenglish's dictionary.
+ */
+static inline uint64_t DictHash( const char *psz_string, int hashsize )
+{
+ uint64_t i_hash = 0;
+ if( psz_string )
+ {
+ while( *psz_string )
+ {
+ i_hash += *psz_string++;
+ i_hash += i_hash << 10;
+ i_hash ^= i_hash >> 8;
+ }
+ }
+ return i_hash % hashsize;
+}
+
+struct vlc_dictionary_entry_t
+{
+ char * psz_key;
+ void * p_value;
+ struct vlc_dictionary_entry_t * p_next;
+};
+
+typedef struct vlc_dictionary_t
+{
+ int i_size;
+ struct vlc_dictionary_entry_t ** p_entries;
+} vlc_dictionary_t;
+
+static void * const kVLCDictionaryNotFound = NULL;
+
+static inline void vlc_dictionary_init( vlc_dictionary_t * p_dict, int i_size )
+{
+ if( i_size > 0 )
+ {
+ p_dict->p_entries = (struct vlc_dictionary_entry_t **)malloc(sizeof(struct vlc_dictionary_entry_t *) * i_size);
+ assert( p_dict->p_entries );
+ memset( p_dict->p_entries, 0, sizeof(struct vlc_dictionary_entry_t *) * i_size );
+ }
+ else
+ p_dict->p_entries = NULL;
+ p_dict->i_size = i_size;
+}
+
+static inline void vlc_dictionary_clear( vlc_dictionary_t * p_dict )
+{
+ int i;
+ struct vlc_dictionary_entry_t * p_current, * p_next;
+ for( i = 0; i < p_dict->i_size; i++ )
+ {
+ p_current = p_dict->p_entries[i];
+ while( p_current )
+ {
+ p_next = p_dict->p_entries[i]->p_next;
+ free( p_dict->p_entries[i]->psz_key );
+ free( p_current );
+ p_current = p_next;
+ }
+ }
+ free( p_dict->p_entries );
+ p_dict->i_size = 0;
+}
+
+
+
+static inline void *
+vlc_dictionary_value_for_key( const vlc_dictionary_t * p_dict, const char * psz_key )
+{
+ if( !p_dict->p_entries )
+ return kVLCDictionaryNotFound;
+
+ int i_pos = DictHash( psz_key, p_dict->i_size );
+ struct vlc_dictionary_entry_t * p_entry = p_dict->p_entries[i_pos];
+
+ if( p_entry && !p_entry->p_next )
+ return p_entry->p_value;
+
+ if( !p_entry )
+ return kVLCDictionaryNotFound;
+
+ /* Hash collision */
+ do {
+ if( !strcmp( psz_key, p_entry->psz_key ) )
+ return p_entry->p_value;
+ p_entry = p_entry->p_next;
+ } while( p_entry );
+
+ return kVLCDictionaryNotFound;
+}
+
+static inline int
+vlc_dictionary_keys_count( const vlc_dictionary_t * p_dict )
+{
+ struct vlc_dictionary_entry_t * p_entry;
+ int i, count = 0;
+ for( i = 0; i < p_dict->i_size; i++ )
+ {
+ for( p_entry = p_dict->p_entries[i]; p_entry; p_entry = p_entry->p_next ) count++;
+ }
+ return count;
+}
+
+static inline char **
+vlc_dictionary_all_keys( const vlc_dictionary_t * p_dict )
+{
+ struct vlc_dictionary_entry_t * p_entry;
+ char ** ppsz_ret;
+ int i, count = vlc_dictionary_keys_count( p_dict );
+
+ ppsz_ret = (char**)malloc(sizeof(char *) * (count + 1));
+ assert( ppsz_ret );
+
+ count = 0;
+ for( i = 0; i < p_dict->i_size; i++ )
+ {
+ for( p_entry = p_dict->p_entries[i]; p_entry; p_entry = p_entry->p_next )
+ {
+ ppsz_ret[count++] = strdup( p_entry->psz_key );
+ assert( ppsz_ret );
+ }
+ }
+ ppsz_ret[count] = NULL;
+ return ppsz_ret;
+}
+
+static inline void
+__vlc_dictionary_insert( vlc_dictionary_t * p_dict, const char * psz_key,
+ void * p_value, vlc_bool_t rebuild )
+{
+ if( !p_dict->p_entries )
+ vlc_dictionary_init( p_dict, 1 );
+
+ int i_pos = DictHash( psz_key, p_dict->i_size );
+ struct vlc_dictionary_entry_t * p_entry = p_dict->p_entries[i_pos];
+
+ if( !p_entry )
+ {
+ p_entry = p_dict->p_entries[i_pos] = (struct vlc_dictionary_entry_t *)malloc(
+ sizeof(struct vlc_dictionary_entry_t));
+ assert( p_entry );
+
+ p_entry->psz_key = strdup( psz_key );
+ assert( p_entry->psz_key );
+ p_entry->p_value = p_value;
+ p_dict->p_entries[i_pos]->p_next = NULL;
+ return;
+ }
+ if( p_entry->p_value == kVLCDictionaryNotFound )
+ {
+ /* This one is fine, just high jack */
+ p_entry->psz_key = strdup( psz_key );
+ p_entry->p_value = p_value;
+ return;
+ }
+
+ /* Hash collision here */
+ p_entry = (struct vlc_dictionary_entry_t *)malloc(sizeof(struct vlc_dictionary_entry_t));
+ assert( p_entry );
+ p_entry->psz_key = strdup( psz_key );
+ p_entry->p_value = p_value;
+ p_entry->p_next = p_dict->p_entries[i_pos];
+ p_dict->p_entries[i_pos] = p_entry;
+
+ if( rebuild )
+ {
+ /* Count how many items there was */
+ int count;
+ for( count = 1; p_entry->p_next; count++ ) p_entry = p_entry->p_next;
+ if( count > 3 ) /* XXX: this need tuning */
+ {
+ /* Here it starts to be not good, rebuild a bigger dictionary */
+ struct vlc_dictionary_t new_dict;
+ int i_new_size = ( (p_dict->i_size+2) * 3) / 2; /* XXX: this need tuning */
+ int i;
+
+ vlc_dictionary_init( &new_dict, i_new_size );
+ for( i = 0; i < p_dict->i_size; i++ )
+ {
+ p_entry = p_dict->p_entries[i];
+ while( p_entry );
+ {
+ __vlc_dictionary_insert( &new_dict, p_entry->psz_key,
+ p_entry->p_value,
+ 0 /* To avoid multiple rebuild loop */);
+ p_entry = p_entry->p_next;
+ }
+ }
+ vlc_dictionary_clear( p_dict );
+ p_dict->i_size = new_dict.i_size;
+ p_dict->p_entries= new_dict.p_entries;
+ }
+ }
+}
+
+static inline void
+vlc_dictionary_insert( vlc_dictionary_t * p_dict, const char * psz_key, void * p_value )
+{
+ __vlc_dictionary_insert( p_dict, psz_key, p_value, 1 );
+}
+
+static inline void
+vlc_dictionary_remove_value_for_key( const vlc_dictionary_t * p_dict, const char * psz_key )
+{
+ if( !p_dict->p_entries )
+ return;
+
+ int i_pos = DictHash( psz_key, p_dict->i_size );
+ struct vlc_dictionary_entry_t * p_entry = p_dict->p_entries[i_pos];
+ struct vlc_dictionary_entry_t * p_prev;
+
+ if( !p_entry )
+ return; /* Not found, nothing to do */
+
+ if( !p_entry->p_next )
+ {
+ free( p_entry->psz_key );
+ free( p_entry );
+ p_dict->p_entries[i_pos] = NULL;
+ return;
+ }
+
+ /* Hash collision */
+ p_prev = NULL;
+ do {
+ if( !strcmp( psz_key, p_entry->psz_key ) )
+ {
+ if( !p_prev )
+ p_dict->p_entries[i_pos] = p_entry->p_next;
+ else
+ p_prev->p_next = p_entry->p_next;
+ free( p_entry->psz_key );
+ free( p_entry );
+ return;
+ }
+ p_prev = p_entry;
+ p_entry = p_entry->p_next;
+ } while( p_entry );
+
+ /* No key was found */
+}
+
#endif
projects / vlc / blobdiff