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/* csstest.c - test program for libdvdcss
*
* Sam Hocevar <sam@zoy.org> - June 2001
* Updated on Nov 13th 2001 for libdvdcss version 1.0.0
* Additional error checks on Aug 9th 2002
* Aligned data reads on Jan 28th 2003
*
* This piece of code is public domain */
#include <stdio.h>
#include <stdlib.h>
#include <dvdcss/dvdcss.h>
static int isscrambled( unsigned char * );
static void dumpsector ( unsigned char * );
int main( int i_argc, char *ppsz_argv[] )
{
dvdcss_t dvdcss;
unsigned char p_data[ DVDCSS_BLOCK_SIZE * 2 ];
unsigned char *p_buffer;
unsigned int i_sector;
int i_ret;
/* Check for 2 arguments */
if( i_argc != 3 )
{
printf( "usage: %s <target> <sector>\n", ppsz_argv[0] );
printf( "examples:\n" );
printf( " %s /dev/hdc 1024\n", ppsz_argv[0] );
printf( " %s D: 1024\n", ppsz_argv[0] );
printf( " %s scrambledfile.vob 1024\n", ppsz_argv[0] );
return -1;
}
/* Save the requested sector */
i_sector = atoi( ppsz_argv[2] );
/* Initialize libdvdcss */
dvdcss = dvdcss_open( ppsz_argv[1] );
if( dvdcss == NULL )
{
printf( "argh ! couldn't open DVD (%s)\n", ppsz_argv[1] );
return -1;
}
/* Align our read buffer */
p_buffer = p_data + DVDCSS_BLOCK_SIZE
- ((long int)p_data & (DVDCSS_BLOCK_SIZE-1));
/* Set the file descriptor at sector i_sector and read one sector */
i_ret = dvdcss_seek( dvdcss, i_sector, DVDCSS_NOFLAGS );
if( i_ret != (int)i_sector )
{
printf( "seek failed (%s)\n", dvdcss_error( dvdcss ) );
dvdcss_close( dvdcss );
return i_ret;
}
i_ret = dvdcss_read( dvdcss, p_buffer, 1, DVDCSS_NOFLAGS );
if( i_ret != 1 )
{
printf( "read failed (%s)\n", dvdcss_error( dvdcss ) );
dvdcss_close( dvdcss );
return i_ret;
}
/* Print the sector */
printf( "requested sector: " );
dumpsector( p_buffer );
/* Check if sector was encrypted */
if( isscrambled( p_buffer ) )
{
/* Set the file descriptor position to the previous location */
/* ... and get the appropriate key for this sector */
i_ret = dvdcss_seek( dvdcss, i_sector, DVDCSS_SEEK_KEY );
if( i_ret != (int)i_sector )
{
printf( "seek failed (%s)\n", dvdcss_error( dvdcss ) );
dvdcss_close( dvdcss );
return i_ret;
}
/* Read sector again, and decrypt it on the fly */
i_ret = dvdcss_read( dvdcss, p_buffer, 1, DVDCSS_READ_DECRYPT );
if( i_ret != 1 )
{
printf( "read failed (%s)\n", dvdcss_error( dvdcss ) );
dvdcss_close( dvdcss );
return i_ret;
}
/* Print the decrypted sector */
printf( "unscrambled sector: " );
dumpsector( p_buffer );
}
else
{
printf( "sector is not scrambled\n" );
}
/* Close the device */
i_ret = dvdcss_close( dvdcss );
return i_ret;
}
/* Check if a sector is scrambled */
static int isscrambled( unsigned char *p_buffer )
{
return p_buffer[ 0x14 ] & 0x30;
}
/* Print parts of a 2048 bytes buffer */
static void dumpsector( unsigned char *p_buffer )
{
int i_amount = 4;
for( ; i_amount ; i_amount--, p_buffer++ ) printf( "%.2x", *p_buffer );
printf( "..." );
i_amount = 22;
p_buffer += 200;
for( ; i_amount ; i_amount--, p_buffer++ ) printf( "%.2x", *p_buffer );
printf( "...\n" );
}
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