/*****************************************************************************
 * directory.c: expands a directory (directory: access plug-in)
 *****************************************************************************
 * Copyright (C) 2001, 2002 VideoLAN
 * $Id: directory.c,v 1.2 2003/03/24 01:39:58 gbazin Exp $
 *
 * Authors: Derk-Jan Hartman <thedj@users.sourceforge.net>
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <vlc/vlc.h>
#include <vlc/input.h>

#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SYS_TYPES_H
#   include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#   include <sys/stat.h>
#endif
#ifdef HAVE_ERRNO_H
#   include <errno.h>
#endif
#ifdef HAVE_FCNTL_H
#   include <fcntl.h>
#endif

#ifdef HAVE_UNISTD_H
#   include <unistd.h>
#elif defined( WIN32 ) && !defined( UNDER_CE )
#   include <io.h>
#endif

#if (!defined( WIN32 ) || defined(__MINGW32__))
/* Mingw has its own version of dirent */
#   include <dirent.h>
#endif

/*****************************************************************************
 * Constants and structures
 *****************************************************************************/
#define MAX_DIR_SIZE 50000

typedef struct input_directory_s
{
    char   p_dir_buffer[MAX_DIR_SIZE];
    int    i_buf_pos;
    int    i_buf_length;
} input_directory_t;


/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static int     Open   ( vlc_object_t * );
static void    Close  ( vlc_object_t * );

static ssize_t Read   ( input_thread_t *, byte_t *, size_t );

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/

vlc_module_begin();
    set_description( _("Standard filesystem directory reading") );
    set_capability( "access", 55 );
    add_shortcut( "directory" );
    add_shortcut( "dir" );
    set_callbacks( Open, Close );
vlc_module_end();


/*****************************************************************************
 * Open: open the directory
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    input_thread_t *            p_input = (input_thread_t *)p_this;
    char *                      psz_name;
    input_directory_t *         p_access_data;
#ifdef HAVE_SYS_STAT_H
    struct stat                 stat_info;
#endif
    DIR *                       p_current_dir;
    struct dirent *             p_dir_content;
    int                         i_pos=0;
    
    /* Initialize access plug-in structures. */
    if( p_input->i_mtu == 0 )
    {
        /* Improve speed. */
        p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
    }

    p_input->pf_read = Read;
    p_input->pf_set_program = NULL;
    p_input->pf_set_area = NULL;
    p_input->pf_seek = NULL;

    /* Remove the ending '/' char */
    psz_name = strdup( p_input->psz_name );
    if( psz_name == NULL )
        return VLC_EGENERIC;

    if( (psz_name[strlen(psz_name)-1] == '/') ||
        (psz_name[strlen(psz_name)-1] == '\\') )
    {
        psz_name[strlen(psz_name)-1] = '\0';
    }


#ifdef HAVE_SYS_STAT_H
    if( ( stat( psz_name, &stat_info ) == -1 ) ||
        !S_ISDIR( stat_info.st_mode ) )
#else
    if( !p_input->psz_access || strcmp(p_input->psz_access, "dir") )
#endif
    {
        free( psz_name );
        return VLC_EGENERIC;
    }

    msg_Dbg( p_input, "opening directory `%s'", psz_name );
    p_access_data = malloc( sizeof(input_directory_t) );
    p_input->p_access_data = (void *)p_access_data;
    if( p_access_data == NULL )
    {
        msg_Err( p_input, "out of memory" );
        free( psz_name );
        return VLC_ENOMEM;
    }
        
    /* have to cd into this dir */
    p_current_dir = opendir( psz_name );

    if( p_current_dir == NULL )
    {
        /* something went bad, get out of here ! */
#   ifdef HAVE_ERRNO_H
        msg_Warn( p_input, "cannot open directory `%s' (%s)",
                  psz_name, strerror(errno));
#   else
        msg_Warn( p_input, "cannot open directory `%s'", psz_name );
#   endif
        free( p_access_data );
        free( psz_name );
        return VLC_EGENERIC;
    }
    
    p_dir_content = readdir( p_current_dir );

    /* while we still have entries in the directory */
    while( p_dir_content != NULL && i_pos < MAX_DIR_SIZE )
    {
        int i_size_entry = strlen( psz_name ) +
                           strlen( p_dir_content->d_name ) + 2;
        /* if it is "." or "..", forget it */
        if( strcmp( p_dir_content->d_name, "." ) &&
            strcmp( p_dir_content->d_name, ".." ) &&
            i_pos + i_size_entry < MAX_DIR_SIZE )
        {
            msg_Dbg( p_input, "%s", p_dir_content->d_name );
            sprintf( &p_access_data->p_dir_buffer[i_pos], "%s/%s",
                     psz_name, p_dir_content->d_name );
            msg_Dbg( p_input, "%s", &p_access_data->p_dir_buffer[i_pos] );
            i_pos += i_size_entry - 1;
            p_access_data->p_dir_buffer[i_pos] = '\n';
            i_pos++;
        }
        p_dir_content = readdir( p_current_dir );
    }
    p_access_data->p_dir_buffer[i_pos] = '\0';
    i_pos++;
    p_access_data->i_buf_length = i_pos;
    p_access_data->i_buf_pos = 0;
    
    msg_Dbg( p_input, "%s", p_access_data->p_dir_buffer );

    closedir( p_current_dir );
    free( psz_name );

    /* Force m3u demuxer */
    p_input->psz_demux = "m3u";

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close: close the target
 *****************************************************************************/
static void Close( vlc_object_t * p_this )
{
    input_thread_t * p_input = (input_thread_t *)p_this;
    input_directory_t * p_access_data =
        (input_directory_t *)p_input->p_access_data;

    msg_Info( p_input, "closing `%s/%s://%s'", 
              p_input->psz_access, p_input->psz_demux, p_input->psz_name );

    free( p_access_data );
}

/*****************************************************************************
 * Read: read directory and output to demux.
 *****************************************************************************/
static ssize_t Read( input_thread_t * p_input, byte_t * p_buffer, size_t i_len )
{
    input_directory_t * p_access_data =
        (input_directory_t *)p_input->p_access_data;
    unsigned int i_remaining = p_access_data->i_buf_length -
                               p_access_data->i_buf_pos;

    if( i_remaining > 0 )
    {
        int i_ret;

        i_ret = __MIN( i_len, i_remaining );
        memcpy( p_buffer,
                &p_access_data->p_dir_buffer[p_access_data->i_buf_pos],
                i_ret );
        p_access_data->i_buf_pos += i_ret;
        return (ssize_t) i_ret;
    }
    
    p_input->stream.b_connected = VLC_TRUE;
    return 0;
}
