* vlc_arrays.h : Arrays and data structures handling
*****************************************************************************
* Copyright (C) 1999-2004 the VideoLAN team
- * $Id: vlc_playlist.h 17108 2006-10-15 15:28:34Z zorglub $
+ * $Id$
*
* Authors: Samuel Hocevar <sam@zoy.org>
* Clément Stenac <zorglub@videolan.org>
* 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
*/
#define TAB_CLEAN( count, tab ) \
do { \
- if( tab ) free( tab ); \
+ free( tab ); \
(count)= 0; \
(tab)= NULL; \
} while(0)
} \
} while(0)
+
#define TAB_REMOVE( count, tab, p ) \
do { \
int _i_index_; \
} \
} while(0)
-/************************************************************************
- * Dictionaries
- ************************************************************************/
-
-#ifdef __cplusplus__
-extern "C"
-{
-#endif
-/* 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 )
-{
- 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;
-}
-typedef struct vlc_dictionary_t
-{
- struct vlc_dictionary_entries_t
- {
- char * psz_key;
- uint64_t i_hash;
- void * p_value;
- } * p_entries;
- int i_entries;
-} vlc_dictionary_t;
-
-static void * const kVLCDictionaryNotFound = (void *)-1;
-
-static inline void vlc_dictionary_init( vlc_dictionary_t * p_dict )
-{
- p_dict->i_entries = 0;
- p_dict->p_entries = NULL;
-}
-
-static inline void vlc_dictionary_clear( vlc_dictionary_t * p_dict )
-{
- int i;
- for ( i = 0; i < p_dict->i_entries; i++ )
- {
- free( p_dict->p_entries[i].psz_key );
- }
- free( p_dict->p_entries );
- p_dict->i_entries = 0;
- p_dict->p_entries = NULL;
-}
-
-
-static inline void *
-vlc_dictionary_value_for_key( vlc_dictionary_t * p_dict, const char * psz_key )
-{
- uint64_t i_hash;
- int i, i_pos;
-
- if( p_dict->i_entries == 0 )
- return kVLCDictionaryNotFound;
-
- i_hash = DictHash( psz_key );
- BSEARCH( p_dict->p_entries, p_dict->i_entries, .i_hash, uint64_t,
- i_hash, i_pos );
- if( i_pos == -1 )
- return kVLCDictionaryNotFound;
-
- /* Hash found, let's check it looks like the entry */
- if( !strcmp( psz_key, p_dict->p_entries[i_pos].psz_key ) )
- return p_dict->p_entries[i_pos].p_value;
-
- /* Hash collision! This should be very rare, but we cannot guarantee
- * it will never happen. Just do an exhaustive search amongst all
- * entries with the same hash. */
- for( i = i_pos - 1 ; i > 0 && i_hash == p_dict->p_entries[i].i_hash ; i-- )
- {
- if( !strcmp( psz_key, p_dict->p_entries[i].psz_key ) )
- return p_dict->p_entries[i_pos].p_value;
- }
- for( i = i_pos + 1 ; i < p_dict->i_entries &&
- i_hash == p_dict->p_entries[i].i_hash ; i++ )
- {
- if( !strcmp( psz_key, p_dict->p_entries[i].psz_key ))
- return p_dict->p_entries[i_pos].p_value;
- }
- /* Hash found, but entry not found (shouldn't happen!) */
- return kVLCDictionaryNotFound;
-}
-
-static inline void
-vlc_dictionary_insert( vlc_dictionary_t * p_dict, const char * psz_key, void * p_value )
-{
- uint64_t i_hash = DictHash( psz_key );
- int i_new;
-
- /* First, caller should take care not to insert twice the same key */
- /* This could be removed for optimization */
- assert( vlc_dictionary_value_for_key( p_dict, psz_key ) == kVLCDictionaryNotFound );
-
- /* Find a free slot */
- if( p_dict->i_entries == 0 || i_hash <= p_dict->p_entries[0].i_hash )
- i_new = 0;
- else if( i_hash >= p_dict->p_entries[p_dict->i_entries-1].i_hash )
- i_new = p_dict->i_entries;
- else
- {
- int i_low = 0, i_high = p_dict->i_entries - 1;
- while( i_high - i_low > 1 )
- {
- int i_mid = (i_low + i_high)/2;
- if( p_dict->p_entries[i_mid].i_hash < i_hash ) {
- i_low = i_mid;
- } else if( p_dict->p_entries[i_mid].i_hash > i_hash ) {
- i_high = i_mid;
- }
- }
- if( p_dict->p_entries[i_low].i_hash < i_hash )
- i_new = i_high;
- else
- i_new = i_low;
- }
- p_dict->p_entries = realloc( p_dict->p_entries, (p_dict->i_entries + 1) *
- sizeof(struct vlc_dictionary_entries_t) );
- p_dict->i_entries++;
- if( i_new != p_dict->i_entries -1 )
- {
- memmove( &p_dict->p_entries[i_new+1], &p_dict->p_entries[i_new],
- ( p_dict->i_entries - i_new - 1 ) *
- sizeof(struct vlc_dictionary_entries_t) );
- }
-
- p_dict->p_entries[i_new].i_hash = i_hash;
- p_dict->p_entries[i_new].psz_key = strdup( psz_key );
- p_dict->p_entries[i_new].p_value = p_value;
-}
-#ifdef __cplusplus__
-} /* extern "C" */
-#endif
/************************************************************************
* Dynamic arrays with progressive allocation
************************************************************************/
array.i_alloc = newsize; \
array.p_elems = VLCCVP realloc( array.p_elems, array.i_alloc * \
sizeof(*array.p_elems) ); \
- assert(array.p_elems); \
}
#define _ARRAY_GROW1(array) { \
} \
}
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
/* API */
#define DECL_ARRAY(type) struct { \
#define FOREACH_END() } }
+
+/************************************************************************
+ * Dynamic arrays with progressive allocation (Preferred API)
+ ************************************************************************/
+typedef struct vlc_array_t
+{
+ int i_count;
+ void ** pp_elems;
+} vlc_array_t;
+
+static inline void vlc_array_init( vlc_array_t * p_array )
+{
+ memset( p_array, 0, sizeof(vlc_array_t) );
+}
+
+static inline void vlc_array_clear( vlc_array_t * p_array )
+{
+ free( p_array->pp_elems );
+ memset( p_array, 0, sizeof(vlc_array_t) );
+}
+
+static inline vlc_array_t * vlc_array_new( void )
+{
+ vlc_array_t * ret = (vlc_array_t *)malloc( sizeof(vlc_array_t) );
+ if( ret ) vlc_array_init( ret );
+ return ret;
+}
+
+static inline void vlc_array_destroy( vlc_array_t * p_array )
+{
+ if( !p_array )
+ return;
+ vlc_array_clear( p_array );
+ free( p_array );
+}
+
+
+/* Read */
+static inline int
+vlc_array_count( vlc_array_t * p_array )
+{
+ return p_array->i_count;
+}
+
+static inline void *
+vlc_array_item_at_index( vlc_array_t * p_array, int i_index )
+{
+ return p_array->pp_elems[i_index];
+}
+
+static inline int
+vlc_array_index_of_item( vlc_array_t * p_array, void * item )
+{
+ int i;
+ for( i = 0; i < p_array->i_count; i++)
+ {
+ if( p_array->pp_elems[i] == item )
+ return i;
+ }
+ return -1;
+}
+
+/* Write */
+static inline void
+vlc_array_insert( vlc_array_t * p_array, void * p_elem, int i_index )
+{
+ TAB_INSERT_CAST( (void **), p_array->i_count, p_array->pp_elems, p_elem, i_index );
+}
+
+static inline void
+vlc_array_append( vlc_array_t * p_array, void * p_elem )
+{
+ vlc_array_insert( p_array, p_elem, p_array->i_count );
+}
+
+static inline void
+vlc_array_remove( vlc_array_t * p_array, int i_index )
+{
+ if( i_index >= 0 )
+ {
+ if( p_array->i_count > 1 )
+ {
+ memmove( p_array->pp_elems + i_index,
+ p_array->pp_elems + i_index+1,
+ ( p_array->i_count - i_index - 1 ) * sizeof( void* ) );
+ }
+ p_array->i_count--;
+ if( p_array->i_count == 0 )
+ {
+ free( p_array->pp_elems );
+ p_array->pp_elems = NULL;
+ }
+ }
+}
+
+
+/************************************************************************
+ * 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);
+ 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;
+ if( p_dict->p_entries )
+ {
+ for( i = 0; i < p_dict->i_size; i++ )
+ {
+ p_current = p_dict->p_entries[i];
+ while( p_current )
+ {
+ p_next = p_current->p_next;
+ free( p_current->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 )
+ return kVLCDictionaryNotFound;
+
+ /* Make sure we return the right item. (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;
+
+ if( !p_dict->p_entries )
+ return 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));
+
+ 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 );
+ }
+ 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, bool 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_entry = (struct vlc_dictionary_entry_t *)malloc(sizeof(struct vlc_dictionary_entry_t));
+ 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 */
+
+ /* 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