* libdvdcss.c: DVD reading library.
*****************************************************************************
* Copyright (C) 1998-2001 VideoLAN
- * $Id: libdvdcss.c,v 1.4 2001/07/07 21:10:58 gbazin Exp $
+ * $Id: libdvdcss.c,v 1.5 2001/07/11 02:01:03 sam Exp $
*
* Authors: Stéphane Borel <stef@via.ecp.fr>
* Samuel Hocevar <sam@zoy.org>
}
/* Initialize structure */
+ dvdcss->p_keys = NULL;
dvdcss->b_debug = i_flags & DVDCSS_INIT_DEBUG;
dvdcss->b_errors = !(i_flags & DVDCSS_INIT_QUIET);
dvdcss->psz_error = "no error";
/*****************************************************************************
* dvdcss_crack: crack the current title key
*****************************************************************************/
-extern int dvdcss_crack ( dvdcss_handle dvdcss, int i_title, int i_block )
+extern int dvdcss_crack ( dvdcss_handle dvdcss, int i_block )
{
+ title_key_t **pp_writekey;
+ title_key_t **pp_currentkey;
+ title_key_t *p_titlekey;
+ dvd_key_t p_key;
int i_ret;
if( ! dvdcss->b_encrypted )
return 0;
}
- /* Crack CSS title key for current VTS */
- dvdcss->css.i_title = i_title;
- dvdcss->css.i_title_pos = i_block;
+ /* Check if we've already cracked this key */
+ p_titlekey = dvdcss->p_keys;
+ while( p_titlekey != NULL
+ && p_titlekey->p_next != NULL
+ && p_titlekey->p_next->i_startlb < i_block )
+ {
+ p_titlekey = p_titlekey->p_next;
+ }
- i_ret = CSSGetKey( dvdcss );
+ if( p_titlekey != NULL && p_titlekey->i_startlb == i_block )
+ {
+ /* We've already cracked this key, nothing to do */
+ return 0;
+ }
+
+ /* Crack CSS title key for current VTS */
+ i_ret = CSSGetKey( dvdcss, i_block, p_key );
if( i_ret < 0 )
{
return -1;
}
+ /* Add key to keytable if it isn't empty */
+ if( p_key[0] || p_key[1] || p_key[2] || p_key[3] || p_key[4] )
+ {
+ /* Find our spot in the list */
+ pp_writekey = &(dvdcss->p_keys);
+ pp_currentkey = pp_writekey;
+ while( *pp_currentkey != NULL
+ && (*pp_currentkey)->i_startlb < i_block )
+ {
+ pp_writekey = pp_currentkey;
+ pp_currentkey = &((*pp_currentkey)->p_next);
+ }
+
+ /* Write in the new key */
+ p_titlekey = *pp_writekey;
+ *pp_writekey = malloc( sizeof( title_key_t ) );
+ (*pp_writekey)->i_startlb = i_block;
+ memcpy( (*pp_writekey)->p_key, p_key, KEY_SIZE );
+ (*pp_writekey)->p_next = p_titlekey;
+ }
+
return 0;
}
int i_blocks,
int i_flags )
{
- int i_ret;
+ title_key_t *p_current;
+ int i_ret, i_index;
i_ret = _dvdcss_read( dvdcss, p_buffer, i_blocks );
- if( i_ret != i_blocks
+ if( i_ret <= 0
|| !dvdcss->b_encrypted
|| !(i_flags & DVDCSS_READ_DECRYPT) )
{
return i_ret;
}
- while( i_ret )
+ /* find our key */
+ p_current = dvdcss->p_keys;
+ while( p_current != NULL
+ && p_current->p_next
+ && p_current->p_next->i_startlb < dvdcss->i_seekpos )
+ {
+ p_current = p_current->p_next;
+ }
+
+ if( p_current == NULL )
+ {
+ /* no css key found to use, so no decryption to do */
+ return 0;
+ }
+
+ /* Decrypt the blocks we managed to read */
+ for( i_index = i_ret; i_index; i_index-- )
{
- CSSDescrambleSector( dvdcss->css.pi_title_key, p_buffer );
+ CSSDescrambleSector( p_current->p_key, p_buffer );
((u8*)p_buffer)[0x14] &= 0x8f;
(u8*)p_buffer += DVDCSS_BLOCK_SIZE;
- i_ret--;
}
- return i_blocks;
+ return i_ret;
}
/*****************************************************************************
int i_flags )
{
#define P_IOVEC ((struct iovec*)p_iovec)
- int i_ret;
+ title_key_t *p_current;
+ int i_ret, i_index;
void *iov_base;
size_t iov_len;
i_ret = _dvdcss_readv( dvdcss, P_IOVEC, i_blocks );
- if( i_ret != i_blocks
+ if( i_ret <= 0
|| !dvdcss->b_encrypted
|| !(i_flags & DVDCSS_READ_DECRYPT) )
{
return i_ret;
}
+ /* Find our key */
+ p_current = dvdcss->p_keys;
+ while( p_current != NULL
+ && p_current->p_next
+ && p_current->p_next->i_startlb < dvdcss->i_seekpos )
+ {
+ p_current = p_current->p_next;
+ }
+
+ if( p_current == NULL )
+ {
+ /* no css key found to use, so no decryption to do */
+ return 0;
+ }
+
+
/* Initialize loop for decryption */
iov_base = P_IOVEC->iov_base;
iov_len = P_IOVEC->iov_len;
- while( i_ret )
+ /* Decrypt the blocks we managed to read */
+ for( i_index = i_ret; i_index; i_index-- )
{
/* Check that iov_len is a multiple of 2048 */
if( iov_len & 0x7ff )
iov_len = P_IOVEC->iov_len;
}
- CSSDescrambleSector( dvdcss->css.pi_title_key, iov_base );
+ CSSDescrambleSector( p_current->p_key, iov_base );
((u8*)iov_base)[0x14] &= 0x8f;
(u8*)iov_base += DVDCSS_BLOCK_SIZE;
(u8*)iov_len -= DVDCSS_BLOCK_SIZE;
-
- i_ret--;
}
- return i_blocks;
+ return i_ret;
#undef P_IOVEC
}
*****************************************************************************/
extern int dvdcss_close ( dvdcss_handle dvdcss )
{
+ title_key_t *p_currentkey;
int i_ret;
+ /* Free our list of keys */
+ p_currentkey = dvdcss->p_keys;
+ while( p_currentkey )
+ {
+ title_key_t *p_tmpkey = p_currentkey->p_next;
+ free( p_currentkey );
+ p_currentkey = p_tmpkey;
+ }
+
i_ret = _dvdcss_close( dvdcss );
if( i_ret < 0 )
static int _dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks )
{
-
#if defined( WIN32 )
if( WIN2K )
{
#else
off_t i_read;
+ dvdcss->i_seekpos = i_blocks;
+
i_read = lseek( dvdcss->i_fd,
(off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
static int _dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer, int i_blocks )
{
- int i_read;
-
#if defined( WIN32 )
if( WIN2K )
{
+ int i_bytes;
+
if( !ReadFile( (HANDLE) dvdcss->i_fd, p_buffer,
i_blocks * DVDCSS_BLOCK_SIZE,
- (LPDWORD)&i_read, NULL ) )
+ (LPDWORD)&i_bytes, NULL ) )
{
- i_read = -DVDCSS_BLOCK_SIZE;
+ return -1;
}
- return i_read / DVDCSS_BLOCK_SIZE;
+ return i_bytes / DVDCSS_BLOCK_SIZE;
}
else
{
- i_read = _win32_dvdcss_aread( dvdcss->i_fd, p_buffer, i_blocks );
- return i_read;
+ return _win32_dvdcss_aread( dvdcss->i_fd, p_buffer, i_blocks );
}
-#else
- i_read = read( dvdcss->i_fd, p_buffer, (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
- return i_read / DVDCSS_BLOCK_SIZE;
+#else
+ int i_bytes;
+
+ i_bytes = read( dvdcss->i_fd, p_buffer, (size_t)i_blocks * DVDCSS_BLOCK_SIZE );
+ return i_bytes / DVDCSS_BLOCK_SIZE;
#endif
}
ResetEvent( hEvent );
if( fd->lpSendCommand( (void*) &ssc ) == SS_PENDING )
+ {
WaitForSingleObject( hEvent, INFINITE );
+ }
CloseHandle( hEvent );
- if(ssc.SRB_Status != SS_COMP)
+ if( ssc.SRB_Status != SS_COMP )
{
- return -1;
+ return -1;
}
fd->i_blocks += i_blocks;
}
#endif
+
projects / vlc / blobdiff