vlc_arrays.h 12.4 KB
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/*****************************************************************************
 * 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 $
 *
 * 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 General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU 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_

/**
 * Simple dynamic array handling. Array is realloced at each insert/removal
 */
#if defined( _MSC_VER ) && _MSC_VER < 1300 && !defined( UNDER_CE )
#   define VLCCVP (void**) /* Work-around for broken compiler */
#else
#   define VLCCVP
#endif
#define INSERT_ELEM( p_ar, i_oldsize, i_pos, elem )                           \
    do                                                                        \
    {                                                                         \
        if( !i_oldsize ) (p_ar) = NULL;                                       \
        (p_ar) = VLCCVP realloc( p_ar, ((i_oldsize) + 1) * sizeof(*(p_ar)) ); \
        if( (i_oldsize) - (i_pos) )                                           \
        {                                                                     \
            memmove( (p_ar) + (i_pos) + 1, (p_ar) + (i_pos),                  \
                     ((i_oldsize) - (i_pos)) * sizeof( *(p_ar) ) );           \
        }                                                                     \
        (p_ar)[i_pos] = elem;                                                 \
        (i_oldsize)++;                                                        \
    }                                                                         \
    while( 0 )

#define REMOVE_ELEM( p_ar, i_oldsize, i_pos )                                 \
    do                                                                        \
    {                                                                         \
        if( (i_oldsize) - (i_pos) - 1 )                                       \
        {                                                                     \
            memmove( (p_ar) + (i_pos),                                        \
                     (p_ar) + (i_pos) + 1,                                    \
                     ((i_oldsize) - (i_pos) - 1) * sizeof( *(p_ar) ) );       \
        }                                                                     \
        if( i_oldsize > 1 )                                                   \
        {                                                                     \
            (p_ar) = realloc( p_ar, ((i_oldsize) - 1) * sizeof( *(p_ar) ) );  \
        }                                                                     \
        else                                                                  \
        {                                                                     \
            free( p_ar );                                                     \
            (p_ar) = NULL;                                                    \
        }                                                                     \
        (i_oldsize)--;                                                        \
    }                                                                         \
    while( 0 )


#define TAB_APPEND( count, tab, p )             \
    if( (count) > 0 )                           \
    {                                           \
        (tab) = realloc( tab, sizeof( void ** ) * ( (count) + 1 ) ); \
    }                                           \
    else                                        \
    {                                           \
        (tab) = malloc( sizeof( void ** ) );    \
    }                                           \
    (tab)[count] = (p);        \
    (count)++

#define TAB_FIND( count, tab, p, index )        \
    {                                           \
        int _i_;                                \
        (index) = -1;                           \
        for( _i_ = 0; _i_ < (count); _i_++ )    \
        {                                       \
            if( (tab)[_i_] == (p) )  \
            {                                   \
                (index) = _i_;                  \
                break;                          \
            }                                   \
        }                                       \
    }

#define TAB_REMOVE( count, tab, p )             \
    {                                           \
        int _i_index_;                          \
        TAB_FIND( count, tab, p, _i_index_ );   \
        if( _i_index_ >= 0 )                    \
        {                                       \
            if( (count) > 1 )                     \
            {                                   \
                memmove( ((void**)(tab) + _i_index_),    \
                         ((void**)(tab) + _i_index_+1),  \
                         ( (count) - _i_index_ - 1 ) * sizeof( void* ) );\
            }                                   \
            (count)--;                          \
            if( (count) == 0 )                  \
            {                                   \
                free( tab );                    \
                (tab) = NULL;                   \
            }                                   \
        }                                       \
    }

/**
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 * Binary search in a sorted array. The key must be comparable by < and >
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 * \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 ) {  \
    int low = 0, high = count - 1;   \
    answer = -1; \
    while( low <= high ) {\
        int mid = (low + high ) / 2; /* Just don't care about 2^30 tables */ \
        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;   \
        }\
    } \
}

/* 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 * ) );


/************************************************************************
 * Dynamic arrays with progressive allocation
 ************************************************************************/

/* 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 *          \
                                    sizeof(*array.p_elems) );               \
    assert(array.p_elems);                                                  \
}

#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_GROW(array,additional) {                                     \
     int i_first = array.i_alloc;                                           \
     while( array.i_alloc - i_first < additional )                          \
     {                                                                      \
         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) )                \
        else break;                                                         \
     }                                                                      \
}

#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);                              \
    }                                                                       \
}


/* 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)                                                   \
    array.i_alloc = 0;                                                      \
    array.i_size = 0;                                                       \
    array.p_elems = NULL;

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#define ARRAY_RESET(array)                                                  \
    array.i_alloc = 0;                                                      \
    array.i_size = 0;                                                       \
    free( array.p_elems ); array.p_elems = NULL;

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#define ARRAY_APPEND(array, elem) {                                         \
    _ARRAY_GROW1(array);                                                    \
    array.p_elems[array.i_size] = elem;                                     \
    array.i_size++;                                                         \
}

#define ARRAY_INSERT(array,elem,pos) {                                      \
    _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++;                                                         \
}

#define ARRAY_REMOVE(array,pos) {                                           \
    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);                                                   \
}

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#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() } }

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#endif