ref: 9d7698f671f51ec94efbce21040c37d7eef88e61
dir: /src/libdvdcss.c/
/*****************************************************************************
* libdvdcss.c: DVD reading library.
*****************************************************************************
* Copyright (C) 1998-2001 VideoLAN
* $Id: libdvdcss.c,v 1.3 2002/03/09 17:57:53 hjort Exp $
*
* Authors: St�phane Borel <[email protected]>
* Samuel Hocevar <[email protected]>
* H�kan Hjort <[email protected]>
*
* 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 "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#if defined( WIN32 )
# include <io.h> /* read() */
#else
# include <sys/uio.h> /* struct iovec */
#endif
#include "dvdcss.h"
#include "common.h"
#include "css.h"
#include "libdvdcss.h"
#include "ioctl.h"
/*****************************************************************************
* iovec structure: vectored data entry
*****************************************************************************/
#if defined( WIN32 )
struct iovec
{
void *iov_base; /* Pointer to data. */
size_t iov_len; /* Length of data. */
};
#endif
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int _dvdcss_open ( dvdcss_handle, char *psz_target );
static int _dvdcss_close ( dvdcss_handle );
static int _dvdcss_readv ( dvdcss_handle, struct iovec *p_iovec, int i_blocks );
/*****************************************************************************
* Local prototypes, win32 specific
*****************************************************************************/
#if defined( WIN32 )
static int _win32_dvdcss_readv ( int i_fd, struct iovec *p_iovec,
int i_num_buffers, char *p_tmp_buffer );
static int _win32_dvdcss_aopen ( char c_drive, dvdcss_handle dvdcss );
static int _win32_dvdcss_aclose ( int i_fd );
static int _win32_dvdcss_aseek ( int i_fd, int i_blocks, int i_method );
static int _win32_dvdcss_aread ( int i_fd, void *p_data, int i_blocks );
#else
static int _dvdcss_raw_open ( dvdcss_handle, char *psz_target );
#endif
/*****************************************************************************
* readv_*: readv() replacements for iovec-impaired C libraries
*****************************************************************************/
#if defined( WIN32 )
static __inline__ int readv( int i_fd, struct iovec *p_iovec, int i_count )
{
int i_index, i_len, i_total = 0;
unsigned char *p_base;
int i_bytes;
for( i_index = i_count; i_index; i_index-- )
{
i_len = p_iovec->iov_len;
p_base = p_iovec->iov_base;
/* Loop is unrolled one time to spare the (i_bytes <= 0) test */
if( i_len > 0 )
{
i_bytes = read( i_fd, p_base, i_len );
if( i_bytes < 0 )
{
/* One of the reads failed, too bad.
We won't even bother returning the reads that went ok,
and as in the posix spec the file postition is left
unspecified after a failure */
return -1;
}
i_total += i_bytes;
if( i_bytes != i_len )
{
/* we reached the end of the file or a signal interrupted
the read */
return i_total;
}
}
p_iovec++;
}
return i_total;
}
#endif /* WIN32 */
/*****************************************************************************
* dvdcss_open: initialize library, open a DVD device, crack CSS key
*****************************************************************************/
extern dvdcss_handle dvdcss_open ( char *psz_target )
{
int i_ret;
char *psz_method = getenv( "DVDCSS_METHOD" );
char *psz_verbose = getenv( "DVDCSS_VERBOSE" );
#ifndef WIN32
char *psz_raw_device = getenv( "DVDCSS_RAW_DEVICE" );
#endif
dvdcss_handle dvdcss;
/* Allocate the library structure */
dvdcss = malloc( sizeof( struct dvdcss_s ) );
if( dvdcss == NULL )
{
return NULL;
}
/* Initialize structure with default values */
dvdcss->p_titles = NULL;
dvdcss->psz_error = "no error";
dvdcss->i_method = DVDCSS_METHOD_TITLE;
dvdcss->b_debug = 0;
dvdcss->b_errors = 1;
/* Find method from DVDCSS_METHOD environment variable */
if( psz_method != NULL )
{
if( !strncmp( psz_method, "key", 4 ) )
{
dvdcss->i_method = DVDCSS_METHOD_KEY;
}
else if( !strncmp( psz_method, "disc", 5 ) )
{
dvdcss->i_method = DVDCSS_METHOD_DISC;
}
else if( !strncmp( psz_method, "title", 5 ) )
{
dvdcss->i_method = DVDCSS_METHOD_TITLE;
}
else
{
_dvdcss_error( dvdcss, "unknown decrypt method, please choose "
"from 'title', 'key' or 'disc'" );
free( dvdcss );
return NULL;
}
}
/* Find verbosity from DVDCSS_VERBOSE environment variable */
if( psz_verbose != NULL )
{
switch( atoi( psz_verbose ) )
{
case 0:
dvdcss->b_errors = 0;
break;
case 1:
break;
case 2:
dvdcss->b_debug = 1;
break;
default:
_dvdcss_error( dvdcss, "unknown verbose level, please choose "
"from '0', '1' or '2'" );
free( dvdcss );
return NULL;
break;
}
}
/* Open device */
i_ret = _dvdcss_open( dvdcss, psz_target );
if( i_ret < 0 )
{
free( dvdcss );
return NULL;
}
i_ret = CSSTest( dvdcss );
if( i_ret < 0 )
{
_dvdcss_error( dvdcss, "CSS test failed" );
/* Disable the CSS ioctls and hope that it works? */
dvdcss->b_ioctls = 0;
dvdcss->b_encrypted = 1;
}
else
{
dvdcss->b_ioctls = 1;
dvdcss->b_encrypted = i_ret;
}
/* If disc is CSS protected and the ioctls work, authenticate the drive */
if( dvdcss->b_encrypted && dvdcss->b_ioctls )
{
i_ret = CSSGetDiscKey( dvdcss );
if( i_ret < 0 )
{
_dvdcss_close( dvdcss );
free( dvdcss );
return NULL;
}
}
#ifndef WIN32
if( psz_raw_device != NULL )
{
_dvdcss_raw_open( dvdcss, psz_raw_device );
}
#endif
return dvdcss;
}
/*****************************************************************************
* dvdcss_error: return the last libdvdcss error message
*****************************************************************************/
extern char * dvdcss_error ( dvdcss_handle dvdcss )
{
return dvdcss->psz_error;
}
/*****************************************************************************
* dvdcss_seek: seek into the device
*****************************************************************************/
extern int dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks, int i_flags )
{
/* title cracking method is too slow to be used at each seek */
if( ( ( i_flags & DVDCSS_SEEK_MPEG )
&& ( dvdcss->i_method != DVDCSS_METHOD_TITLE ) )
|| ( i_flags & DVDCSS_SEEK_KEY ) )
{
/* check the title key */
if( dvdcss_title( dvdcss, i_blocks ) )
{
return -1;
}
}
return _dvdcss_seek( dvdcss, i_blocks );
}
/*****************************************************************************
* dvdcss_title: crack or decrypt the current title key if needed
*****************************************************************************
* This function should only be called by dvdcss_seek and should eventually
* not be external if possible.
*****************************************************************************/
extern int dvdcss_title ( dvdcss_handle dvdcss, int i_block )
{
dvd_title_t *p_title;
dvd_title_t *p_newtitle;
dvd_key_t p_title_key;
int i_ret;
if( ! dvdcss->b_encrypted )
{
return 0;
}
/* Check if we've already cracked this key */
p_title = dvdcss->p_titles;
while( p_title != NULL
&& p_title->p_next != NULL
&& p_title->p_next->i_startlb <= i_block )
{
p_title = p_title->p_next;
}
if( p_title != NULL
&& p_title->i_startlb == i_block )
{
/* We've already cracked this key, nothing to do */
memcpy( dvdcss->css.p_title_key, p_title->p_key, sizeof(dvd_key_t) );
return 0;
}
/* Crack or decrypt CSS title key for current VTS */
i_ret = CSSGetTitleKey( dvdcss, i_block, p_title_key );
if( i_ret < 0 )
{
_dvdcss_error( dvdcss, "fatal error in vts css key" );
return i_ret;
}
else if( i_ret == 0 )
{
_dvdcss_debug( dvdcss, "unecrypted title" );
/* Still store this in the cache, so we don't need to check again. */
}
/* Find our spot in the list */
p_newtitle = NULL;
p_title = dvdcss->p_titles;
while( ( p_title != NULL ) && ( p_title->i_startlb < i_block ) )
{
p_newtitle = p_title;
p_title = p_title->p_next;
}
/* Save the found title */
p_title = p_newtitle;
/* Write in the new title and its key */
p_newtitle = malloc( sizeof( dvd_title_t ) );
p_newtitle->i_startlb = i_block;
memcpy( p_newtitle->p_key, p_title_key, KEY_SIZE );
/* Link the new title, either at the beginning or inside the list */
if( p_title == NULL )
{
dvdcss->p_titles = p_newtitle;
p_newtitle->p_next = NULL;
}
else
{
p_newtitle->p_next = p_title->p_next;
p_title->p_next = p_newtitle;
}
memcpy( dvdcss->css.p_title_key, p_title_key, KEY_SIZE );
return 0;
}
#define Pkey dvdcss->css.p_title_key
/*****************************************************************************
* dvdcss_read: read data from the device, decrypt if requested
*****************************************************************************/
extern int dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer,
int i_blocks,
int i_flags )
{
int i_ret, i_index;
i_ret = _dvdcss_read( dvdcss, p_buffer, i_blocks );
if( i_ret <= 0
|| !dvdcss->b_encrypted
|| !(i_flags & DVDCSS_READ_DECRYPT) )
{
return i_ret;
}
/* For what we believe is an unencrypted title,
check that there are no encrypted blocks */
if( !( Pkey[0] | Pkey[1] | Pkey[2] | Pkey[3] | Pkey[4] ) )
{
for( i_index = i_ret; i_index; i_index-- )
{
if( ((u8*)p_buffer)[0x14] & 0x30 )
{
_dvdcss_error( dvdcss, "no key but found encrypted block" );
/* Only return the initial range of unscrambled blocks? */
i_ret = i_index;
/* or fail completely? return 0; */
}
(u8*)p_buffer += DVDCSS_BLOCK_SIZE;
}
}
/* Decrypt the blocks we managed to read */
for( i_index = i_ret; i_index; i_index-- )
{
CSSDescrambleSector( dvdcss->css.p_title_key, p_buffer );
((u8*)p_buffer)[0x14] &= 0x8f;
(u8*)p_buffer += DVDCSS_BLOCK_SIZE;
}
return i_ret;
}
/*****************************************************************************
* dvdcss_readv: read data to an iovec structure, decrypt if requested
*****************************************************************************/
extern int dvdcss_readv ( dvdcss_handle dvdcss, void *p_iovec,
int i_blocks,
int i_flags )
{
#define P_IOVEC ((struct iovec*)p_iovec)
int i_ret, i_index;
void *iov_base;
size_t iov_len;
i_ret = _dvdcss_readv( dvdcss, P_IOVEC, i_blocks );
if( i_ret <= 0
|| !dvdcss->b_encrypted
|| !(i_flags & DVDCSS_READ_DECRYPT) )
{
return i_ret;
}
/* Initialize loop for decryption */
iov_base = P_IOVEC->iov_base;
iov_len = P_IOVEC->iov_len;
/* 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 )
{
return -1;
}
while( iov_len == 0 )
{
P_IOVEC++;
iov_base = P_IOVEC->iov_base;
iov_len = P_IOVEC->iov_len;
}
CSSDescrambleSector( dvdcss->css.p_title_key, iov_base );
((u8*)iov_base)[0x14] &= 0x8f;
(u8*)iov_base += DVDCSS_BLOCK_SIZE;
(u8*)iov_len -= DVDCSS_BLOCK_SIZE;
}
return i_ret;
#undef P_IOVEC
}
#undef Pkey
/*****************************************************************************
* dvdcss_close: close the DVD device and clean up the library
*****************************************************************************/
extern int dvdcss_close ( dvdcss_handle dvdcss )
{
dvd_title_t *p_title;
int i_ret;
/* Free our list of keys */
p_title = dvdcss->p_titles;
while( p_title )
{
dvd_title_t *p_tmptitle = p_title->p_next;
free( p_title );
p_title = p_tmptitle;
}
i_ret = _dvdcss_close( dvdcss );
if( i_ret < 0 )
{
return i_ret;
}
free( dvdcss );
return 0;
}
/* Following functions are local */
static int _dvdcss_open ( dvdcss_handle dvdcss, char *psz_target )
{
#if defined( WIN32 )
if( WIN2K )
{
char psz_dvd[7];
_snprintf( psz_dvd, 7, "\\\\.\\%c:", psz_target[0] );
(HANDLE) dvdcss->i_fd =
CreateFile( psz_dvd, GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, NULL );
if( (HANDLE) dvdcss->i_fd == INVALID_HANDLE_VALUE )
{
_dvdcss_error( dvdcss, "failed opening device" );
return -1;
}
}
else
{
dvdcss->i_fd = _win32_dvdcss_aopen( psz_target[0], dvdcss );
if( dvdcss->i_fd == -1 )
{
_dvdcss_error( dvdcss, "failed opening device" );
return -1;
}
}
/* initialise readv temporary buffer */
dvdcss->p_readv_buffer = NULL;
dvdcss->i_readv_buf_size = 0;
#else
dvdcss->i_fd = dvdcss->i_read_fd = open( psz_target, 0 );
if( dvdcss->i_fd == -1 )
{
_dvdcss_error( dvdcss, "failed opening device" );
return -1;
}
#endif
return 0;
}
#ifndef WIN32
static int _dvdcss_raw_open ( dvdcss_handle dvdcss, char *psz_target )
{
dvdcss->i_raw_fd = open( psz_target, 0 );
if( dvdcss->i_raw_fd == -1 )
{
_dvdcss_error( dvdcss, "failed opening raw device, continuing" );
return -1;
}
else
{
dvdcss->i_read_fd = dvdcss->i_raw_fd;
}
return 0;
}
#endif
static int _dvdcss_close ( dvdcss_handle dvdcss )
{
#if defined( WIN32 )
if( WIN2K )
{
CloseHandle( (HANDLE) dvdcss->i_fd );
}
else
{
_win32_dvdcss_aclose( dvdcss->i_fd );
}
/* Free readv temporary buffer */
if( dvdcss->p_readv_buffer )
{
free( dvdcss->p_readv_buffer );
dvdcss->p_readv_buffer = NULL;
dvdcss->i_readv_buf_size = 0;
}
#else
close( dvdcss->i_fd );
if( dvdcss->i_raw_fd >= 0 )
{
close( dvdcss->i_raw_fd );
dvdcss->i_raw_fd = -1;
}
#endif
return 0;
}
int _dvdcss_seek ( dvdcss_handle dvdcss, int i_blocks )
{
#if defined( WIN32 )
dvdcss->i_seekpos = i_blocks;
if( WIN2K )
{
LARGE_INTEGER li_read;
#ifndef INVALID_SET_FILE_POINTER
#define INVALID_SET_FILE_POINTER ((DWORD)-1)
#endif
li_read.QuadPart = (LONGLONG)i_blocks * DVDCSS_BLOCK_SIZE;
li_read.LowPart = SetFilePointer( (HANDLE) dvdcss->i_fd,
li_read.LowPart,
&li_read.HighPart, FILE_BEGIN );
if( (li_read.LowPart == INVALID_SET_FILE_POINTER)
&& GetLastError() != NO_ERROR)
{
li_read.QuadPart = -DVDCSS_BLOCK_SIZE;
}
li_read.QuadPart /= DVDCSS_BLOCK_SIZE;
return (int)li_read.QuadPart;
}
else
{
return ( _win32_dvdcss_aseek( dvdcss->i_fd, i_blocks, SEEK_SET ) );
}
#else
off_t i_read;
dvdcss->i_seekpos = i_blocks;
i_read = lseek( dvdcss->i_read_fd,
(off_t)i_blocks * (off_t)DVDCSS_BLOCK_SIZE, SEEK_SET );
return i_read / DVDCSS_BLOCK_SIZE;
#endif
}
int _dvdcss_read ( dvdcss_handle dvdcss, void *p_buffer, int i_blocks )
{
#if defined( WIN32 )
if( WIN2K )
{
int i_bytes;
if( !ReadFile( (HANDLE) dvdcss->i_fd, p_buffer,
i_blocks * DVDCSS_BLOCK_SIZE,
(LPDWORD)&i_bytes, NULL ) )
{
return -1;
}
return i_bytes / DVDCSS_BLOCK_SIZE;
}
else
{
return _win32_dvdcss_aread( dvdcss->i_fd, p_buffer, i_blocks );
}
#else
int i_bytes;
i_bytes = read( dvdcss->i_read_fd, p_buffer,
(size_t)i_blocks * DVDCSS_BLOCK_SIZE );
return i_bytes / DVDCSS_BLOCK_SIZE;
#endif
}
static int _dvdcss_readv ( dvdcss_handle dvdcss, struct iovec *p_iovec,
int i_blocks )
{
int i_read;
#if defined( WIN32 )
/* Check the size of the readv temp buffer, just in case we need to
* realloc something bigger */
if( dvdcss->i_readv_buf_size < i_blocks * DVDCSS_BLOCK_SIZE )
{
dvdcss->i_readv_buf_size = i_blocks * DVDCSS_BLOCK_SIZE;
if( dvdcss->p_readv_buffer ) free( dvdcss->p_readv_buffer );
/* Allocate a buffer which will be used as a temporary storage
* for readv */
dvdcss->p_readv_buffer = malloc( dvdcss->i_readv_buf_size );
if( !dvdcss->p_readv_buffer )
{
_dvdcss_error( dvdcss, " failed (readv)" );
return -1;
}
}
i_read = _win32_dvdcss_readv( dvdcss->i_fd, p_iovec, i_blocks,
dvdcss->p_readv_buffer );
return i_read;
#else
i_read = readv( dvdcss->i_read_fd, p_iovec, i_blocks );
return i_read / DVDCSS_BLOCK_SIZE;
#endif
}
#if defined( WIN32 )
/*****************************************************************************
* _win32_dvdcss_readv: vectored read using ReadFile for Win2K and
* _win32_dvdcss_aread for win9x
*****************************************************************************/
static int _win32_dvdcss_readv( int i_fd, struct iovec *p_iovec,
int i_num_buffers, char *p_tmp_buffer )
{
int i_index;
int i_blocks, i_blocks_total = 0;
for( i_index = i_num_buffers; i_index; i_index-- )
{
i_blocks_total += p_iovec[i_index-1].iov_len;
}
if( i_blocks_total <= 0 ) return 0;
i_blocks_total /= DVDCSS_BLOCK_SIZE;
if( WIN2K )
{
unsigned long int i_bytes;
if( !ReadFile( (HANDLE)i_fd, p_tmp_buffer,
i_blocks_total * DVDCSS_BLOCK_SIZE, &i_bytes, NULL ) )
{
return -1;
/* The read failed... too bad.
As in the posix spec the file postition is left
unspecified after a failure */
}
i_blocks = i_bytes / DVDCSS_BLOCK_SIZE;
}
else /* Win9x */
{
i_blocks = _win32_dvdcss_aread( i_fd, p_tmp_buffer, i_blocks_total );
if( i_blocks < 0 )
{
return -1; /* idem */
}
}
/* We just have to copy the content of the temp buffer into the iovecs */
i_index = 0;
i_blocks_total = i_blocks;
while( i_blocks_total > 0 )
{
memcpy( p_iovec[i_index].iov_base,
&p_tmp_buffer[(i_blocks - i_blocks_total) * DVDCSS_BLOCK_SIZE],
p_iovec[i_index].iov_len );
/* if we read less blocks than asked, we'll just end up copying
garbage, this isn't an issue as we return the number of
blocks actually read */
i_blocks_total -= ( p_iovec[i_index].iov_len / DVDCSS_BLOCK_SIZE );
i_index++;
}
return i_blocks;
}
/*****************************************************************************
* _win32_dvdcss_aopen: open dvd drive (load aspi and init w32_aspidev
* structure)
*****************************************************************************/
static int _win32_dvdcss_aopen( char c_drive, dvdcss_handle dvdcss )
{
HMODULE hASPI;
DWORD dwSupportInfo;
struct w32_aspidev *fd;
int i, j, i_hostadapters;
long (*lpGetSupport)( void );
long (*lpSendCommand)( void* );
hASPI = LoadLibrary( "wnaspi32.dll" );
if( hASPI == NULL )
{
_dvdcss_error( dvdcss, "unable to load wnaspi32.dll" );
return -1;
}
(FARPROC) lpGetSupport = GetProcAddress( hASPI, "GetASPI32SupportInfo" );
(FARPROC) lpSendCommand = GetProcAddress( hASPI, "SendASPI32Command" );
if(lpGetSupport == NULL || lpSendCommand == NULL )
{
_dvdcss_debug( dvdcss, "unable to get aspi function pointers" );
FreeLibrary( hASPI );
return -1;
}
dwSupportInfo = lpGetSupport();
if( HIBYTE( LOWORD ( dwSupportInfo ) ) == SS_NO_ADAPTERS )
{
_dvdcss_debug( dvdcss, "no host adapters found (aspi)" );
FreeLibrary( hASPI );
return -1;
}
if( HIBYTE( LOWORD ( dwSupportInfo ) ) != SS_COMP )
{
_dvdcss_error( dvdcss, "unable to initalize aspi layer" );
FreeLibrary( hASPI );
return -1;
}
i_hostadapters = LOBYTE( LOWORD( dwSupportInfo ) );
if( i_hostadapters == 0 )
{
FreeLibrary( hASPI );
return -1;
}
fd = malloc( sizeof( struct w32_aspidev ) );
if( fd == NULL )
{
FreeLibrary( hASPI );
return -1;
}
fd->i_blocks = 0;
fd->hASPI = (long) hASPI;
fd->lpSendCommand = lpSendCommand;
c_drive = c_drive > 'Z' ? c_drive - 'a' : c_drive - 'A';
for( i = 0; i < i_hostadapters; i++ )
{
for( j = 0; j < 15; j++ )
{
struct SRB_GetDiskInfo srbDiskInfo;
srbDiskInfo.SRB_Cmd = SC_GET_DISK_INFO;
srbDiskInfo.SRB_HaId = i;
srbDiskInfo.SRB_Flags = 0;
srbDiskInfo.SRB_Hdr_Rsvd = 0;
srbDiskInfo.SRB_Target = j;
srbDiskInfo.SRB_Lun = 0;
lpSendCommand( (void*) &srbDiskInfo );
if( (srbDiskInfo.SRB_Status == SS_COMP) &&
(srbDiskInfo.SRB_Int13HDriveInfo == c_drive) )
{
fd->i_sid = MAKEWORD( i, j );
return (int) fd;
}
}
}
free( (void*) fd );
FreeLibrary( hASPI );
_dvdcss_debug( dvdcss, "unable to get haid and target (aspi)" );
return( -1 );
}
/*****************************************************************************
* _win32_dvdcss_aclose: close dvd drive (unload aspi and free w32_aspidev
* structure)
*****************************************************************************/
static int _win32_dvdcss_aclose( int i_fd )
{
struct w32_aspidev *fd = (struct w32_aspidev *) i_fd;
FreeLibrary( (HMODULE) fd->hASPI );
free( (void*) i_fd );
return 0;
}
/*****************************************************************************
* _win32_dvdcss_aseek: aspi version of _dvdcss_seek
*
* returns the number of blocks read.
*****************************************************************************/
static int _win32_dvdcss_aseek( int i_fd, int i_blocks, int i_method )
{
int i_old_blocks;
char sz_buf[ DVDCSS_BLOCK_SIZE ];
struct w32_aspidev *fd = (struct w32_aspidev *) i_fd;
i_old_blocks = fd->i_blocks;
fd->i_blocks = i_blocks;
if( _win32_dvdcss_aread( i_fd, sz_buf, 1 ) == -1 )
{
fd->i_blocks = i_old_blocks;
return -1;
}
(fd->i_blocks)--;
return fd->i_blocks;
}
/*****************************************************************************
* _win32_dvdcss_aread: aspi version of _dvdcss_read
*
* returns the number of blocks read.
*****************************************************************************/
static int _win32_dvdcss_aread( int i_fd, void *p_data, int i_blocks )
{
HANDLE hEvent;
struct SRB_ExecSCSICmd ssc;
struct w32_aspidev *fd = (struct w32_aspidev *) i_fd;
/* Create the transfer completion event */
hEvent = CreateEvent( NULL, TRUE, FALSE, NULL );
if( hEvent == NULL )
{
return -1;
}
memset( &ssc, 0, sizeof( ssc ) );
ssc.SRB_Cmd = SC_EXEC_SCSI_CMD;
ssc.SRB_Flags = SRB_DIR_IN | SRB_EVENT_NOTIFY;
ssc.SRB_HaId = LOBYTE( fd->i_sid );
ssc.SRB_Target = HIBYTE( fd->i_sid );
ssc.SRB_SenseLen = SENSE_LEN;
ssc.SRB_PostProc = (LPVOID) hEvent;
ssc.SRB_BufPointer = p_data;
ssc.SRB_CDBLen = 12;
ssc.CDBByte[0] = 0xA8; /* RAW */
ssc.CDBByte[2] = (UCHAR) (fd->i_blocks >> 24);
ssc.CDBByte[3] = (UCHAR) (fd->i_blocks >> 16) & 0xff;
ssc.CDBByte[4] = (UCHAR) (fd->i_blocks >> 8) & 0xff;
ssc.CDBByte[5] = (UCHAR) (fd->i_blocks) & 0xff;
/* We have to break down the reads into 64kb pieces (ASPI restriction) */
if( i_blocks > 32 )
{
ssc.SRB_BufLen = 32 * DVDCSS_BLOCK_SIZE;
ssc.CDBByte[9] = 32;
fd->i_blocks += 32;
/* Initiate transfer */
ResetEvent( hEvent );
fd->lpSendCommand( (void*) &ssc );
/* transfer the next 64kb (_win32_dvdcss_aread is called recursively)
* We need to check the status of the read on return */
if( _win32_dvdcss_aread( i_fd, (u8*) p_data + 32 * DVDCSS_BLOCK_SIZE,
i_blocks - 32) < 0 )
{
return -1;
}
}
else
{
/* This is the last transfer */
ssc.SRB_BufLen = i_blocks * DVDCSS_BLOCK_SIZE;
ssc.CDBByte[9] = (UCHAR) i_blocks;
fd->i_blocks += i_blocks;
/* Initiate transfer */
ResetEvent( hEvent );
fd->lpSendCommand( (void*) &ssc );
}
/* If the command has still not been processed, wait until it's finished */
if( ssc.SRB_Status == SS_PENDING )
{
WaitForSingleObject( hEvent, INFINITE );
}
CloseHandle( hEvent );
/* check that the transfer went as planned */
if( ssc.SRB_Status != SS_COMP )
{
return -1;
}
return i_blocks;
}
#endif