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322 lines
11 KiB
322 lines
11 KiB
/*****************************************************************************
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* dvd.c : DVD input module for vlc
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*****************************************************************************
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* Copyright (C) 2000-2001 VideoLAN
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* $Id: dvd.c,v 1.31 2002/04/19 13:56:10 sam Exp $
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*
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* Authors: Samuel Hocevar <sam@zoy.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <stdlib.h> /* malloc(), free() */
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#include <string.h> /* strdup() */
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#include <videolan/vlc.h>
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#ifdef GOD_DAMN_DMCA
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# include <stdio.h>
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# include <fcntl.h>
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# include <unistd.h>
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# include <sys/types.h>
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# include <sys/stat.h>
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# include <sys/uio.h> /* struct iovec */
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# include <sys/ioctl.h>
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# include <dlfcn.h>
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# include <netinet/in.h>
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# include <linux/cdrom.h>
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# include "dummy_dvdcss.h"
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#endif
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/*****************************************************************************
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* Capabilities defined in the other files.
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*****************************************************************************/
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void _M( access_getfunctions)( function_list_t * p_function_list );
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void _M( demux_getfunctions)( function_list_t * p_function_list );
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/*****************************************************************************
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* Local prototypes.
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*****************************************************************************/
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#ifdef GOD_DAMN_DMCA
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static void *p_libdvdcss;
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static void ProbeLibDVDCSS ( void );
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static void UnprobeLibDVDCSS( void );
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#endif
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/*****************************************************************************
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* Build configuration tree.
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*****************************************************************************/
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MODULE_CONFIG_START
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ADD_CATEGORY_HINT( N_("[dvd:][device][@raw_device][@[title][,[chapter][,angle]]]"), NULL )
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MODULE_CONFIG_STOP
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MODULE_INIT_START
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ADD_CAPABILITY( DEMUX, 0 )
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#ifdef GOD_DAMN_DMCA
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SET_DESCRIPTION( _("DVD input module, uses libdvdcss if present") )
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ADD_CAPABILITY( ACCESS, 90 )
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#else
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SET_DESCRIPTION( _("DVD input module, uses libdvdcss") )
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ADD_CAPABILITY( ACCESS, 100 )
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#endif
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ADD_SHORTCUT( "dvd" )
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MODULE_INIT_STOP
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MODULE_ACTIVATE_START
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_M( access_getfunctions)( &p_module->p_functions->access );
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_M( demux_getfunctions)( &p_module->p_functions->demux );
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#ifdef GOD_DAMN_DMCA
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ProbeLibDVDCSS();
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#endif
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MODULE_ACTIVATE_STOP
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MODULE_DEACTIVATE_START
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#ifdef GOD_DAMN_DMCA
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UnprobeLibDVDCSS();
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#endif
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MODULE_DEACTIVATE_STOP
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/* Following functions are local */
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#ifdef GOD_DAMN_DMCA
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/*****************************************************************************
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* ProbeLibDVDCSS: look for a libdvdcss object.
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*****************************************************************************
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* This functions looks for libdvdcss, using dlopen(), and fills function
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* pointers with what it finds. On failure, uses the dummy libdvdcss
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* replacement provided by vlc.
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*****************************************************************************/
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static void ProbeLibDVDCSS( void )
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{
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static char *pp_filelist[] = { "libdvdcss.so.2",
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"./libdvdcss.so.2",
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"./lib/libdvdcss.so.2",
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"libdvdcss.so.1",
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"./libdvdcss.so.1",
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"./lib/libdvdcss.so.1",
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NULL };
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char **pp_file = pp_filelist;
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/* Try to open the dynamic object */
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do
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{
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p_libdvdcss = dlopen( *pp_file, RTLD_LAZY );
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if( p_libdvdcss != NULL )
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{
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intf_WarnMsg( 2, "module: builtin module `dvd' found libdvdcss "
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"in `%s'", *pp_file );
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break;
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}
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pp_file++;
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} while( *pp_file != NULL );
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/* If libdvdcss.so was found, check that it's valid */
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if( p_libdvdcss == NULL )
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{
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intf_ErrMsg( "dvd warning: libdvdcss.so.2 not present" );
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}
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else
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{
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____dvdcss_open = dlsym( p_libdvdcss, "dvdcss_open" );
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____dvdcss_close = dlsym( p_libdvdcss, "dvdcss_close" );
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____dvdcss_title = dlsym( p_libdvdcss, "dvdcss_title" );
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____dvdcss_seek = dlsym( p_libdvdcss, "dvdcss_seek" );
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____dvdcss_read = dlsym( p_libdvdcss, "dvdcss_read" );
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____dvdcss_readv = dlsym( p_libdvdcss, "dvdcss_readv" );
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____dvdcss_error = dlsym( p_libdvdcss, "dvdcss_error" );
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if( ____dvdcss_open == NULL || ____dvdcss_close == NULL
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|| ____dvdcss_title == NULL || ____dvdcss_seek == NULL
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|| ____dvdcss_read == NULL || ____dvdcss_readv == NULL
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|| ____dvdcss_error == NULL )
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{
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intf_ErrMsg( "dvd warning: missing symbols in libdvdcss.so.2, "
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"this shouldn't happen !" );
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dlclose( p_libdvdcss );
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p_libdvdcss = NULL;
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}
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}
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/* If libdvdcss was not found or was not valid, use the dummy
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* replacement functions. */
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if( p_libdvdcss == NULL )
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{
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intf_ErrMsg( "dvd warning: no valid libdvdcss found, "
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"I will only play unencrypted DVDs" );
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intf_ErrMsg( "dvd warning: get libdvdcss at "
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"http://www.videolan.org/libdvdcss/" );
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____dvdcss_open = dummy_dvdcss_open;
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____dvdcss_close = dummy_dvdcss_close;
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____dvdcss_title = dummy_dvdcss_title;
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____dvdcss_seek = dummy_dvdcss_seek;
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____dvdcss_read = dummy_dvdcss_read;
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____dvdcss_readv = dummy_dvdcss_readv;
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____dvdcss_error = dummy_dvdcss_error;
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}
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}
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/*****************************************************************************
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* UnprobeLibDVDCSS: free resources allocated by ProbeLibDVDCSS, if any.
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*****************************************************************************/
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static void UnprobeLibDVDCSS( void )
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{
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if( p_libdvdcss != NULL )
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{
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dlclose( p_libdvdcss );
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p_libdvdcss = NULL;
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}
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}
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/* Dummy libdvdcss with minimal DVD access. */
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/*****************************************************************************
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* Local structure
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*****************************************************************************/
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struct dvdcss_s
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{
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/* File descriptor */
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int i_fd;
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};
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/*****************************************************************************
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* dvdcss_open: initialize library, open a DVD device, crack CSS key
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*****************************************************************************/
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extern dvdcss_handle dummy_dvdcss_open ( char *psz_target )
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{
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dvdcss_handle dvdcss;
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dvd_struct dvd;
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/* Allocate the library structure */
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dvdcss = malloc( sizeof( struct dvdcss_s ) );
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if( dvdcss == NULL )
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{
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fprintf( stderr, "dvd error: "
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"dummy libdvdcss could not allocate memory\n" );
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return NULL;
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}
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/* Open the device */
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dvdcss->i_fd = open( psz_target, 0 );
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if( dvdcss->i_fd < 0 )
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{
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fprintf( stderr, "dvd error: "
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"dummy libdvdcss could not open device\n" );
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free( dvdcss );
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return NULL;
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}
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/* Check for encryption or ioctl failure */
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dvd.type = DVD_STRUCT_COPYRIGHT;
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dvd.copyright.layer_num = 0;
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if( ioctl( dvdcss->i_fd, DVD_READ_STRUCT, &dvd ) != 0
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|| dvd.copyright.cpst )
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{
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fprintf( stderr, "dvd error: "
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"dummy libdvdcss could not decrypt disc\n" );
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close( dvdcss->i_fd );
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free( dvdcss );
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return NULL;
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}
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return dvdcss;
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}
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/*****************************************************************************
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* dvdcss_error: return the last libdvdcss error message
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*****************************************************************************/
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extern char * dummy_dvdcss_error ( dvdcss_handle dvdcss )
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{
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return "generic error";
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}
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/*****************************************************************************
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* dvdcss_seek: seek into the device
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*****************************************************************************/
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extern int dummy_dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks,
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int i_flags )
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{
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off_t i_read;
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i_read = lseek( dvdcss->i_fd,
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(off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
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return i_read / DVDCSS_BLOCK_SIZE;
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}
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/*****************************************************************************
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* dvdcss_title: crack the current title key if needed
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*****************************************************************************/
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extern int dummy_dvdcss_title ( dvdcss_handle dvdcss, int i_block )
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{
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return 0;
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}
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/*****************************************************************************
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* dvdcss_read: read data from the device, decrypt if requested
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*****************************************************************************/
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extern int dummy_dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
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int i_blocks,
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int i_flags )
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{
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int i_bytes;
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i_bytes = read( dvdcss->i_fd, p_buffer,
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(size_t)i_blocks * DVDCSS_BLOCK_SIZE );
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return i_bytes / DVDCSS_BLOCK_SIZE;
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}
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/*****************************************************************************
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* dvdcss_readv: read data to an iovec structure, decrypt if reaquested
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*****************************************************************************/
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extern int dummy_dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
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int i_blocks,
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int i_flags )
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{
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int i_read;
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i_read = readv( dvdcss->i_fd, (struct iovec*)p_iovec, i_blocks );
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return i_read / DVDCSS_BLOCK_SIZE;
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}
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/*****************************************************************************
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* dvdcss_close: close the DVD device and clean up the library
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*****************************************************************************/
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extern int dummy_dvdcss_close ( dvdcss_handle dvdcss )
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{
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int i_ret;
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i_ret = close( dvdcss->i_fd );
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if( i_ret < 0 )
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{
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return i_ret;
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}
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free( dvdcss );
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return 0;
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}
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#endif
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