628 lines
20 KiB
C++
628 lines
20 KiB
C++
/*****************************************************************************
|
|
* vlc_arrays.h : Arrays and data structures handling
|
|
*****************************************************************************
|
|
* Copyright (C) 1999-2004 VLC authors and VideoLAN
|
|
* $Id: 39b69952ffce040330da239f52778c3e82024bc4 $
|
|
*
|
|
* Authors: Samuel Hocevar <sam@zoy.org>
|
|
* Clément Stenac <zorglub@videolan.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU Lesser General Public License as published by
|
|
* the Free Software Foundation; either version 2.1 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this program; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
|
|
*****************************************************************************/
|
|
|
|
#ifndef VLC_ARRAYS_H_
|
|
#define VLC_ARRAYS_H_
|
|
|
|
/**
|
|
* \file
|
|
* This file defines functions, structures and macros for handling arrays in vlc
|
|
*/
|
|
|
|
/* realloc() that never fails *if* downsizing */
|
|
static inline void *realloc_down( void *ptr, size_t size )
|
|
{
|
|
void *ret = realloc( ptr, size );
|
|
return ret ? ret : ptr;
|
|
}
|
|
|
|
#define TAB_INIT( count, tab ) \
|
|
do { \
|
|
(count) = 0; \
|
|
(tab) = NULL; \
|
|
} while(0)
|
|
|
|
#define TAB_CLEAN( count, tab ) \
|
|
do { \
|
|
free( tab ); \
|
|
(count)= 0; \
|
|
(tab)= NULL; \
|
|
} while(0)
|
|
|
|
#define TAB_APPEND_CAST( cast, count, tab, p ) \
|
|
do { \
|
|
if( (count) > 0 ) \
|
|
(tab) = cast realloc( tab, sizeof( *(tab) ) * ( (count) + 1 ) ); \
|
|
else \
|
|
(tab) = cast malloc( sizeof( *(tab) ) ); \
|
|
if( !(tab) ) abort(); \
|
|
(tab)[count] = (p); \
|
|
(count)++; \
|
|
} while(0)
|
|
|
|
#define TAB_APPEND( count, tab, p ) \
|
|
TAB_APPEND_CAST( , count, tab, p )
|
|
|
|
#define TAB_FIND( count, tab, p, idx ) \
|
|
do { \
|
|
for( (idx) = 0; (idx) < (count); (idx)++ ) \
|
|
if( (tab)[(idx)] == (p) ) \
|
|
break; \
|
|
if( (idx) >= (count) ) \
|
|
(idx) = -1; \
|
|
} while(0)
|
|
|
|
|
|
#define TAB_ERASE( count, tab, index ) \
|
|
do { \
|
|
if( (count) > 1 ) \
|
|
memmove( (tab) + (index), \
|
|
(tab) + (index) + 1, \
|
|
((count) - (index) - 1 ) * sizeof( *(tab) ) );\
|
|
(count)--; \
|
|
if( (count) == 0 ) \
|
|
{ \
|
|
free( tab ); \
|
|
(tab) = NULL; \
|
|
} \
|
|
} while(0)
|
|
|
|
#define TAB_REMOVE( count, tab, p ) \
|
|
do { \
|
|
int i_index; \
|
|
TAB_FIND( count, tab, p, i_index ); \
|
|
if( i_index >= 0 ) \
|
|
TAB_ERASE( count, tab, i_index ); \
|
|
} while(0)
|
|
|
|
#define TAB_INSERT_CAST( cast, count, tab, p, index ) do { \
|
|
if( (count) > 0 ) \
|
|
(tab) = cast realloc( tab, sizeof( *(tab) ) * ( (count) + 1 ) ); \
|
|
else \
|
|
(tab) = cast malloc( sizeof( *(tab) ) ); \
|
|
if( !(tab) ) abort(); \
|
|
if( (count) - (index) > 0 ) \
|
|
memmove( (tab) + (index) + 1, \
|
|
(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 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 zetype type of the key
|
|
* \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 ) \
|
|
do { \
|
|
int low = 0, high = count - 1; \
|
|
answer = -1; \
|
|
while( low <= high ) {\
|
|
int mid = ((unsigned int)low + (unsigned int)high) >> 1;\
|
|
zetype mid_val = entries[mid] elem;\
|
|
if( mid_val < key ) \
|
|
low = mid + 1; \
|
|
else if ( mid_val > key ) \
|
|
high = mid -1; \
|
|
else \
|
|
{ \
|
|
answer = mid; break; \
|
|
}\
|
|
} \
|
|
} while(0)
|
|
|
|
|
|
/************************************************************************
|
|
* Dynamic arrays with progressive allocation
|
|
************************************************************************/
|
|
|
|
/* Internal functions */
|
|
#define _ARRAY_ALLOC(array, newsize) { \
|
|
(array).i_alloc = newsize; \
|
|
(array).p_elems = realloc( (array).p_elems, (array).i_alloc * \
|
|
sizeof(*(array).p_elems) ); \
|
|
if( !(array).p_elems ) abort(); \
|
|
}
|
|
|
|
#define _ARRAY_GROW1(array) { \
|
|
if( (array).i_alloc < 10 ) \
|
|
_ARRAY_ALLOC(array, 10 ) \
|
|
else if( (array).i_alloc == (array).i_size ) \
|
|
_ARRAY_ALLOC(array, (int)((array).i_alloc * 1.5) ) \
|
|
}
|
|
|
|
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
|
|
|
|
/* API */
|
|
#define DECL_ARRAY(type) struct { \
|
|
int i_alloc; \
|
|
int i_size; \
|
|
type *p_elems; \
|
|
}
|
|
|
|
#define TYPEDEF_ARRAY(type, name) typedef DECL_ARRAY(type) name;
|
|
|
|
#define ARRAY_INIT(array) \
|
|
do { \
|
|
(array).i_alloc = 0; \
|
|
(array).i_size = 0; \
|
|
(array).p_elems = NULL; \
|
|
} while(0)
|
|
|
|
#define ARRAY_RESET(array) \
|
|
do { \
|
|
(array).i_alloc = 0; \
|
|
(array).i_size = 0; \
|
|
free( (array).p_elems ); (array).p_elems = NULL; \
|
|
} while(0)
|
|
|
|
#define ARRAY_APPEND(array, elem) \
|
|
do { \
|
|
_ARRAY_GROW1(array); \
|
|
(array).p_elems[(array).i_size] = elem; \
|
|
(array).i_size++; \
|
|
} while(0)
|
|
|
|
#define ARRAY_INSERT(array,elem,pos) \
|
|
do { \
|
|
_ARRAY_GROW1(array); \
|
|
if( (array).i_size - pos ) { \
|
|
memmove( (array).p_elems + pos + 1, (array).p_elems + pos, \
|
|
((array).i_size-pos) * sizeof(*(array).p_elems) ); \
|
|
} \
|
|
(array).p_elems[pos] = elem; \
|
|
(array).i_size++; \
|
|
} while(0)
|
|
|
|
#define _ARRAY_SHRINK(array) { \
|
|
if( (array).i_size > 10 && (array).i_size < (int)((array).i_alloc / 1.5) ) { \
|
|
_ARRAY_ALLOC(array, (array).i_size + 5); \
|
|
} \
|
|
}
|
|
|
|
#define ARRAY_REMOVE(array,pos) \
|
|
do { \
|
|
if( (array).i_size - (pos) - 1 ) \
|
|
{ \
|
|
memmove( (array).p_elems + pos, (array).p_elems + pos + 1, \
|
|
( (array).i_size - pos - 1 ) *sizeof(*(array).p_elems) ); \
|
|
} \
|
|
(array).i_size--; \
|
|
_ARRAY_SHRINK(array); \
|
|
} while(0)
|
|
|
|
#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() } }
|
|
|
|
|
|
/************************************************************************
|
|
* Dynamic arrays with progressive allocation (Preferred API)
|
|
************************************************************************/
|
|
typedef struct vlc_array_t
|
|
{
|
|
size_t i_count;
|
|
void ** pp_elems;
|
|
} vlc_array_t;
|
|
|
|
static inline void vlc_array_init( vlc_array_t * p_array )
|
|
{
|
|
p_array->i_count = 0;
|
|
p_array->pp_elems = NULL;
|
|
}
|
|
|
|
static inline void vlc_array_clear( vlc_array_t * p_array )
|
|
{
|
|
free( p_array->pp_elems );
|
|
vlc_array_init( p_array );
|
|
}
|
|
|
|
/* Read */
|
|
static inline size_t vlc_array_count( vlc_array_t * p_array )
|
|
{
|
|
return p_array->i_count;
|
|
}
|
|
|
|
#ifndef __cplusplus
|
|
# define vlc_array_item_at_index(ar, idx) \
|
|
_Generic((ar), \
|
|
const vlc_array_t *: ((ar)->pp_elems[idx]), \
|
|
vlc_array_t *: ((ar)->pp_elems[idx]))
|
|
#else
|
|
static inline void *vlc_array_item_at_index( vlc_array_t *ar, size_t idx )
|
|
{
|
|
return ar->pp_elems[idx];
|
|
}
|
|
|
|
static inline const void *vlc_array_item_at_index( const vlc_array_t *ar,
|
|
size_t idx )
|
|
{
|
|
return ar->pp_elems[idx];
|
|
}
|
|
#endif
|
|
|
|
static inline int vlc_array_index_of_item( const vlc_array_t *ar,
|
|
const void *elem )
|
|
{
|
|
for( size_t i = 0; i < ar->i_count; i++ )
|
|
{
|
|
if( ar->pp_elems[i] == elem )
|
|
return i;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/* Write */
|
|
static inline int vlc_array_insert( vlc_array_t *ar, void *elem, int idx )
|
|
{
|
|
void **pp = (void **)realloc( ar->pp_elems,
|
|
sizeof( void * ) * (ar->i_count + 1) );
|
|
if( unlikely(pp == NULL) )
|
|
return -1;
|
|
|
|
size_t tail = ar->i_count - idx;
|
|
if( tail > 0 )
|
|
memmove( pp + idx + 1, pp + idx, sizeof( void * ) * tail );
|
|
|
|
pp[idx] = elem;
|
|
ar->i_count++;
|
|
ar->pp_elems = pp;
|
|
return 0;
|
|
}
|
|
|
|
static inline void vlc_array_insert_or_abort( vlc_array_t *ar, void *elem, int idx )
|
|
{
|
|
if( vlc_array_insert( ar, elem, idx ) )
|
|
abort();
|
|
}
|
|
|
|
static inline int vlc_array_append( vlc_array_t *ar, void *elem )
|
|
{
|
|
void **pp = (void **)realloc( ar->pp_elems,
|
|
sizeof( void * ) * (ar->i_count + 1) );
|
|
if( unlikely(pp == NULL) )
|
|
return -1;
|
|
|
|
pp[ar->i_count++] = elem;
|
|
ar->pp_elems = pp;
|
|
return 0;
|
|
}
|
|
|
|
static inline void vlc_array_append_or_abort( vlc_array_t *ar, void *elem )
|
|
{
|
|
if( vlc_array_append( ar, elem ) != 0 )
|
|
abort();
|
|
}
|
|
|
|
static inline void vlc_array_remove( vlc_array_t *ar, size_t idx )
|
|
{
|
|
void **pp = ar->pp_elems;
|
|
size_t tail = ar->i_count - idx - 1;
|
|
|
|
if( tail > 0 )
|
|
memmove( pp + idx, pp + idx + 1, sizeof( void * ) * tail );
|
|
|
|
ar->i_count--;
|
|
|
|
if( ar->i_count > 0 )
|
|
{
|
|
pp = (void **)realloc( pp, sizeof( void * ) * ar->i_count );
|
|
if( likely(pp != NULL) )
|
|
ar->pp_elems = pp;
|
|
}
|
|
else
|
|
{
|
|
free( pp );
|
|
ar->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;
|
|
}
|
|
|
|
typedef struct vlc_dictionary_entry_t
|
|
{
|
|
char * psz_key;
|
|
void * p_value;
|
|
struct vlc_dictionary_entry_t * p_next;
|
|
} vlc_dictionary_entry_t;
|
|
|
|
typedef struct vlc_dictionary_t
|
|
{
|
|
int i_size;
|
|
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 )
|
|
{
|
|
p_dict->p_entries = NULL;
|
|
|
|
if( i_size > 0 )
|
|
{
|
|
p_dict->p_entries = (vlc_dictionary_entry_t **)calloc( i_size, sizeof(*p_dict->p_entries) );
|
|
if( !p_dict->p_entries )
|
|
i_size = 0;
|
|
}
|
|
p_dict->i_size = i_size;
|
|
}
|
|
|
|
static inline void vlc_dictionary_clear( vlc_dictionary_t * p_dict,
|
|
void ( * pf_free )( void * p_data, void * p_obj ),
|
|
void * p_obj )
|
|
{
|
|
if( p_dict->p_entries )
|
|
{
|
|
for( int i = 0; i < p_dict->i_size; i++ )
|
|
{
|
|
vlc_dictionary_entry_t * p_current, * p_next;
|
|
p_current = p_dict->p_entries[i];
|
|
while( p_current )
|
|
{
|
|
p_next = p_current->p_next;
|
|
if( pf_free != NULL )
|
|
( * pf_free )( p_current->p_value, p_obj );
|
|
free( p_current->psz_key );
|
|
free( p_current );
|
|
p_current = p_next;
|
|
}
|
|
}
|
|
free( p_dict->p_entries );
|
|
p_dict->p_entries = NULL;
|
|
}
|
|
p_dict->i_size = 0;
|
|
}
|
|
|
|
static inline int
|
|
vlc_dictionary_has_key( const vlc_dictionary_t * p_dict, const char * psz_key )
|
|
{
|
|
if( !p_dict->p_entries )
|
|
return 0;
|
|
|
|
int i_pos = DictHash( psz_key, p_dict->i_size );
|
|
const vlc_dictionary_entry_t * p_entry = p_dict->p_entries[i_pos];
|
|
for( ; p_entry != NULL; p_entry = p_entry->p_next )
|
|
{
|
|
if( !strcmp( psz_key, p_entry->psz_key ) )
|
|
break;
|
|
}
|
|
return p_entry != NULL;
|
|
}
|
|
|
|
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 );
|
|
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 )
|
|
{
|
|
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 bool
|
|
vlc_dictionary_is_empty( const vlc_dictionary_t * p_dict )
|
|
{
|
|
if( p_dict->p_entries )
|
|
for( int i = 0; i < p_dict->i_size; i++ )
|
|
if( p_dict->p_entries[i] )
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static inline char **
|
|
vlc_dictionary_all_keys( const vlc_dictionary_t * p_dict )
|
|
{
|
|
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));
|
|
if( unlikely(!ppsz_ret) )
|
|
return NULL;
|
|
|
|
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_impl_( 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 );
|
|
vlc_dictionary_entry_t * p_entry;
|
|
|
|
p_entry = (vlc_dictionary_entry_t *)malloc(sizeof(*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_impl_( &new_dict, p_entry->psz_key,
|
|
p_entry->p_value,
|
|
false /* To avoid multiple rebuild loop */);
|
|
p_entry = p_entry->p_next;
|
|
}
|
|
}
|
|
|
|
vlc_dictionary_clear( p_dict, NULL, NULL );
|
|
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_impl_( p_dict, psz_key, p_value, true );
|
|
}
|
|
|
|
static inline void
|
|
vlc_dictionary_remove_value_for_key( const vlc_dictionary_t * p_dict, const char * psz_key,
|
|
void ( * pf_free )( void * p_data, void * p_obj ),
|
|
void * p_obj )
|
|
{
|
|
if( !p_dict->p_entries )
|
|
return;
|
|
|
|
int i_pos = DictHash( psz_key, p_dict->i_size );
|
|
vlc_dictionary_entry_t * p_entry = p_dict->p_entries[i_pos];
|
|
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( pf_free != NULL )
|
|
( * pf_free )( p_entry->p_value, p_obj );
|
|
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 */
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
// C++ helpers
|
|
template <typename T>
|
|
void vlc_delete_all( T &container )
|
|
{
|
|
typename T::iterator it = container.begin();
|
|
while ( it != container.end() )
|
|
{
|
|
delete *it;
|
|
++it;
|
|
}
|
|
container.clear();
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|