diff options
Diffstat (limited to 'libdvdcss/css.c')
| -rw-r--r-- | libdvdcss/css.c | 68 |
1 files changed, 57 insertions, 11 deletions
diff --git a/libdvdcss/css.c b/libdvdcss/css.c index 23d186ab73..2bb4f18833 100644 --- a/libdvdcss/css.c +++ b/libdvdcss/css.c @@ -16,19 +16,19 @@ * - DecVOB * see http://www.lemuria.org/DeCSS/ by Tom Vogt for more information. * - * This program is free software; you can redistribute it and/or modify + * This library 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, + * This library 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. + * You should have received a copy of the GNU General Public License along + * with this library; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *****************************************************************************/ /***************************************************************************** @@ -89,10 +89,19 @@ static int AttackPadding ( uint8_t const[], int, uint8_t * ); /***************************************************************************** * _dvdcss_test: check if the disc is encrypted or not + ***************************************************************************** + * Return values: + * 1: DVD is scrambled but can be read + * 0: DVD is not scrambled and can be read + * -1: could not get "copyright" information + * -2: could not get RPC information (reading the disc might be possible) + * -3: drive is RPC-II, region is not set, and DVD is scrambled: the RPC + * scheme will prevent us from reading the scrambled data *****************************************************************************/ int _dvdcss_test( dvdcss_t dvdcss ) { - int i_ret, i_copyright; + char const *psz_type, *psz_rpc; + int i_ret, i_copyright, i_type, i_mask, i_rpc; i_ret = ioctl_ReadCopyright( dvdcss->i_fd, 0 /* i_layer */, &i_copyright ); @@ -115,14 +124,51 @@ int _dvdcss_test( dvdcss_t dvdcss ) if( i_ret < 0 ) { /* Since it's the first ioctl we try to issue, we add a notice */ - print_error( dvdcss, "css error: ioctl_ReadCopyright failed, " - "make sure there is a DVD in the drive, and that " - "you have used the correct device node." ); + print_error( dvdcss, "css error: could not get \"copyright\"" + " information, make sure there is a DVD in the drive," + " and that you have used the correct device node." ); + + return -1; + } + + print_debug( dvdcss, "disc reports copyright information 0x%x", + i_copyright ); + + i_ret = ioctl_ReportRPC( dvdcss->i_fd, &i_type, &i_mask, &i_rpc); + + if( i_ret < 0 ) + { + print_error( dvdcss, "css error: could not get RPC status" ); + return -2; + } - return i_ret; + switch( i_rpc ) + { + case 0: psz_rpc = "RPC-I"; break; + case 1: psz_rpc = "RPC-II"; break; + default: psz_rpc = "unknown RPC scheme"; break; + } + + switch( i_type ) + { + case 0: psz_type = "no region code set"; break; + case 1: psz_type = "region code set"; break; + case 2: psz_type = "one region change remaining"; break; + case 3: psz_type = "region code set permanently"; break; + default: psz_type = "unknown status"; break; + } + + print_debug( dvdcss, "drive region mask %x, %s, %s", + i_mask, psz_rpc, psz_type ); + + if( i_copyright && i_rpc == 1 && i_type == 0 ) + { + print_error( dvdcss, "css error: drive will prevent access to " + "scrambled data" ); + return -3; } - return i_copyright; + return i_copyright ? 1 : 0; } /***************************************************************************** |