util.c

uclinux 下的vlc播放器源代码

            for (i_child = 0 ; i_child < p_node->i_children ; i_child++)
                E_(PlaylistListNode)( p_intf, p_pl,
                                      p_node->pp_children[i_child],
                                      name, s, i_depth + 1);

        }
    }
}

/****************************************************************************
 * Seek command parsing handling
 ****************************************************************************/
void E_(HandleSeek)( intf_thread_t *p_intf, char *p_value )
{
    intf_sys_t     *p_sys = p_intf->p_sys;
    vlc_value_t val;
    int i_stock = 0;
    uint64_t i_length;
    int i_value = 0;
    int i_relative = 0;
#define POSITION_ABSOLUTE 12
#define POSITION_REL_FOR 13
#define POSITION_REL_BACK 11
#define VL_TIME_ABSOLUTE 0
#define VL_TIME_REL_FOR 1
#define VL_TIME_REL_BACK -1
    if( p_sys->p_input )
    {
        var_Get( p_sys->p_input, "length", &val );
        i_length = val.i_time;

        while( p_value[0] != '\0' )
        {
            switch(p_value[0])
            {
                case '+':
                {
                    i_relative = VL_TIME_REL_FOR;
                    p_value++;
                    break;
                }
                case '-':
                {
                    i_relative = VL_TIME_REL_BACK;
                    p_value++;
                    break;
                }
                case '0': case '1': case '2': case '3': case '4':
                case '5': case '6': case '7': case '8': case '9':
                {
                    i_stock = strtol( p_value , &p_value , 10 );
                    break;
                }
                case '%': /* for percentage ie position */
                {
                    i_relative += POSITION_ABSOLUTE;
                    i_value = i_stock;
                    i_stock = 0;
                    p_value[0] = '\0';
                    break;
                }
                case ':':
                {
                    i_value = 60 * (i_value + i_stock) ;
                    i_stock = 0;
                    p_value++;
                    break;
                }
                case 'h': case 'H': /* hours */
                {
                    i_value += 3600 * i_stock;
                    i_stock = 0;
                    /* other characters which are not numbers are not
                     * important */
                    while( ((p_value[0] < '0') || (p_value[0] > '9'))
                           && (p_value[0] != '\0') )
                    {
                        p_value++;
                    }
                    break;
                }
                case 'm': case 'M': case '\'': /* minutes */
                {
                    i_value += 60 * i_stock;
                    i_stock = 0;
                    p_value++;
                    while( ((p_value[0] < '0') || (p_value[0] > '9'))
                           && (p_value[0] != '\0') )
                    {
                        p_value++;
                    }
                    break;
                }
                case 's': case 'S': case '"':  /* seconds */
                {
                    i_value += i_stock;
                    i_stock = 0;
                    while( ((p_value[0] < '0') || (p_value[0] > '9'))
                           && (p_value[0] != '\0') )
                    {
                        p_value++;
                    }
                    break;
                }
                default:
                {
                    p_value++;
                    break;
                }
            }
        }

        /* if there is no known symbol, I consider it as seconds.
         * Otherwise, i_stock = 0 */
        i_value += i_stock;

        switch(i_relative)
        {
            case VL_TIME_ABSOLUTE:
            {
                if( (uint64_t)( i_value ) * 1000000 <= i_length )
                    val.i_time = (uint64_t)( i_value ) * 1000000;
                else
                    val.i_time = i_length;

                var_Set( p_sys->p_input, "time", val );
                msg_Dbg( p_intf, "requested seek position: %dsec", i_value );
                break;
            }
            case VL_TIME_REL_FOR:
            {
                var_Get( p_sys->p_input, "time", &val );
                if( (uint64_t)( i_value ) * 1000000 + val.i_time <= i_length )
                {
                    val.i_time = ((uint64_t)( i_value ) * 1000000) + val.i_time;
                } else
                {
                    val.i_time = i_length;
                }
                var_Set( p_sys->p_input, "time", val );
                msg_Dbg( p_intf, "requested seek position forward: %dsec", i_value );
                break;
            }
            case VL_TIME_REL_BACK:
            {
                var_Get( p_sys->p_input, "time", &val );
                if( (int64_t)( i_value ) * 1000000 > val.i_time )
                {
                    val.i_time = 0;
                } else
                {
                    val.i_time = val.i_time - ((uint64_t)( i_value ) * 1000000);
                }
                var_Set( p_sys->p_input, "time", val );
                msg_Dbg( p_intf, "requested seek position backward: %dsec", i_value );
                break;
            }
            case POSITION_ABSOLUTE:
            {
                val.f_float = __MIN( __MAX( ((float) i_value ) / 100.0 ,
                                            0.0 ), 100.0 );
                var_Set( p_sys->p_input, "position", val );
                msg_Dbg( p_intf, "requested seek percent: %d%%", i_value );
                break;
            }
            case POSITION_REL_FOR:
            {
                var_Get( p_sys->p_input, "position", &val );
                val.f_float += __MIN( __MAX( ((float) i_value ) / 100.0,
                                             0.0 ) , 100.0 );
                var_Set( p_sys->p_input, "position", val );
                msg_Dbg( p_intf, "requested seek percent forward: %d%%",
                         i_value );
                break;
            }
            case POSITION_REL_BACK:
            {
                var_Get( p_sys->p_input, "position", &val );
                val.f_float -= __MIN( __MAX( ((float) i_value ) / 100.0,
                                             0.0 ) , 100.0 );
                var_Set( p_sys->p_input, "position", val );
                msg_Dbg( p_intf, "requested seek percent backward: %d%%",
                         i_value );
                break;
            }
            default:
            {
                msg_Dbg( p_intf, "invalid seek request" );
                break;
            }
        }
    }
#undef POSITION_ABSOLUTE
#undef POSITION_REL_FOR
#undef POSITION_REL_BACK
#undef VL_TIME_ABSOLUTE
#undef VL_TIME_REL_FOR
#undef VL_TIME_REL_BACK
}


/****************************************************************************
 * URI Parsing functions
 ****************************************************************************/
int E_(TestURIParam)( char *psz_uri, const char *psz_name )
{
    char *p = psz_uri;

    while( (p = strstr( p, psz_name )) )
    {
        /* Verify that we are dealing with a post/get argument */
        if( (p == psz_uri || *(p - 1) == '&' || *(p - 1) == '\n')
              && p[strlen(psz_name)] == '=' )
        {
            return VLC_TRUE;
        }
        p++;
    }

    return VLC_FALSE;
}
char *E_(ExtractURIValue)( char *psz_uri, const char *psz_name,
                             char *psz_value, int i_value_max )
{
    char *p = psz_uri;

    while( (p = strstr( p, psz_name )) )
    {
        /* Verify that we are dealing with a post/get argument */
        if( (p == psz_uri || *(p - 1) == '&' || *(p - 1) == '\n')
              && p[strlen(psz_name)] == '=' )
            break;
        p++;
    }

    if( p )
    {
        int i_len;

        p += strlen( psz_name );
        if( *p == '=' ) p++;

        if( strchr( p, '&' ) )
        {
            i_len = strchr( p, '&' ) - p;
        }
        else
        {
            /* for POST method */
            if( strchr( p, '\n' ) )
            {
                i_len = strchr( p, '\n' ) - p;
                if( i_len && *(p+i_len-1) == '\r' ) i_len--;
            }
            else
            {
                i_len = strlen( p );
            }
        }
        i_len = __MIN( i_value_max - 1, i_len );
        if( i_len > 0 )
        {
            strncpy( psz_value, p, i_len );
            psz_value[i_len] = '\0';
        }
        else
        {
            strncpy( psz_value, "", i_value_max );
        }
        p += i_len;
    }
    else
    {
        strncpy( psz_value, "", i_value_max );
    }

    return p;
}

/* Since the resulting string is smaller we can work in place, so it is
 * permitted to have psz == new. new points to the first word of the
 * string, the function returns the remaining string. */
char *E_(FirstWord)( char *psz, char *new )
{
    vlc_bool_t b_end;

    while( *psz == ' ' )
        psz++;

    while( *psz != '\0' && *psz != ' ' )
    {
        if( *psz == '\'' )
        {
            char c = *psz++;
            while( *psz != '\0' && *psz != c )
            {
                if( *psz == '\\' && psz[1] != '\0' )
                    psz++;
                *new++ = *psz++;
            }
            if( *psz == c )
                psz++;
        }
        else
        {
            if( *psz == '\\' && psz[1] != '\0' )
                psz++;
            *new++ = *psz++;
        }
    }
    b_end = !*psz;

    *new++ = '\0';
    if( !b_end )
        return psz + 1;
    else
        return NULL;
}

/**********************************************************************
 * MRLParse: parse the MRL, find the MRL string and the options,
 * create an item with all information in it, and return the item.
 * return NULL if there is an error.
 **********************************************************************/

/* Function analog to FirstWord except that it relies on colon instead
 * of space to delimit option boundaries. */
static char *FirstOption( char *psz, char *new )
{
    vlc_bool_t b_end, b_start = VLC_TRUE;

    while( *psz == ' ' )
        psz++;

    while( *psz != '\0' && (*psz != ' ' || psz[1] != ':') )
    {
        if( *psz == '\'' )
        {
            char c = *psz++;
            while( *psz != '\0' && *psz != c )
            {
                if( *psz == '\\' && psz[1] != '\0' )
                    psz++;
                *new++ = *psz++;
                b_start = VLC_FALSE;
            }
            if( *psz == c )
                psz++;
        }
        else
        {
            if( *psz == '\\' && psz[1] != '\0' )
                psz++;
            *new++ = *psz++;
            b_start = VLC_FALSE;
        }
    }
    b_end = !*psz;

    if ( !b_start )
        while (new[-1] == ' ')
            new--;

    *new++ = '\0';
    if( !b_end )
        return psz + 1;
    else
        return NULL;
}

playlist_item_t *E_(MRLParse)( intf_thread_t *p_intf, char *_psz,
                               char *psz_name )
{
    char *psz = strdup( _psz );
    char *s_mrl = psz;
    char *s_temp;
    playlist_item_t * p_item = NULL;

    /* extract the mrl */
    s_temp = FirstOption( s_mrl, s_mrl );
    if( s_temp == NULL )
    {
        s_temp = s_mrl + strlen( s_mrl );
    }

    p_item = playlist_ItemNew( p_intf, s_mrl, psz_name );
    s_mrl = s_temp;

    /* now we can take care of the options */
    while ( *s_mrl != '\0' )
    {
        s_temp = FirstOption( s_mrl, s_mrl );
        if( s_mrl == '\0' )
            break;
        if( s_temp == NULL )
        {
            s_temp = s_mrl + strlen( s_mrl );
        }
        playlist_ItemAddOption( p_item, s_mrl );
        s_mrl = s_temp;
    }

    free( psz );

    return p_item;
}

/**********************************************************************
 * RealPath: parse ../, ~ and path stuff
 **********************************************************************/
char *E_(RealPath)( intf_thread_t *p_intf, const char *psz_src )
{
    char *psz_dir;
    char *p;
    int i_len = strlen(psz_src);
    char sep;

#if defined( WIN32 )
    sep = '\\';
#else
    sep = '/';
#endif

    psz_dir = malloc( i_len + 2 );
    strcpy( psz_dir, psz_src );

    /* Add a trailing sep to ease the .. step */
    psz_dir[i_len] = sep;
    psz_dir[i_len + 1] = '\0';

#ifdef WIN32
    /* Convert all / to native separator */
    p = psz_dir;
    while( (p = strchr( p, '/' )) != NULL )
    {
        *p = sep;
    }
#endif

    /* Remove multiple separators and /./ */
    p = psz_dir;
    while( (p = strchr( p, sep )) != NULL )
    {
        if( p[1] == sep )
            memmove( &p[1], &p[2], strlen(&p[2]) + 1 );
        else if( p[1] == '.' && p[2] == sep )
            memmove( &p[1], &p[3], strlen(&p[3]) + 1 );
        else
            p++;
    }

    if( psz_dir[0] == '~' )
    {
        char *dir = malloc( strlen(psz_dir)
                             + strlen(p_intf->p_vlc->psz_userdir) );
        /* This is incomplete : we should also support the ~cmassiot/ syntax. */
        sprintf( dir, "%s%s", p_intf->p_vlc->psz_userdir, psz_dir + 1 );
        free( psz_dir );
        psz_dir = dir;
    }

    if( strlen(psz_dir) > 2 )
    {
        /* Fix all .. dir */
        p = psz_dir + 3;
        while( (p = strchr( p, sep )) != NULL )
        {
            if( p[-1] == '.' && p[-2] == '.' && p[-3] == sep )
            {
                char *q;
                p[-3] = '\0';
                if( (q = strrchr( psz_dir, sep )) != NULL )
                {
                    memmove( q + 1, p + 1, strlen(p + 1) + 1 );
                    p = q + 1;
                }
                else
                {
                    memmove( psz_dir, p, strlen(p) + 1 );
                    p = psz_dir + 3;
                }
            }
            else
                p++;
        }
    }

    /* Remove trailing sep if there are at least 2 sep in the string
     * (handles the C:\ stuff) */
    p = strrchr( psz_dir, sep );
    if( p != NULL && p[1] == '\0' && p != strchr( psz_dir, sep ) )
        *p = '\0';

    return psz_dir;
}