ref: 92de716371ea7782a6a50185ba9fe5666b054397
dir: /src/libdvdcss.c/
/***************************************************************************** * libdvdcss.c: DVD reading library. ***************************************************************************** * Copyright (C) 1998-2001 VideoLAN * $Id: libdvdcss.c,v 1.8 2002/05/16 12:10:29 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/dvdcss.h" #include "common.h" #include "css.h" #include "libdvdcss.h" #include "ioctl.h" /***************************************************************************** * dvdcss_interface_?: the current libdvdcss version and interface version *****************************************************************************/ char * dvdcss_interface_2 = VERSION; /***************************************************************************** * 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_KEY; 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; } if( !( Pkey[0] | Pkey[1] | Pkey[2] | Pkey[3] | Pkey[4] ) ) { /* For what we believe is an unencrypted title, * check that there are no encrypted blocks */ 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? */ /* or fail completely? return 0; */ break; } (u8*)p_buffer += DVDCSS_BLOCK_SIZE; } } else { /* 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] ); /* To have access to ioctls, we need read and write access to the * device. This is only allowed if you have administrator priviledges * so we allow for a fallback method where ioctls are not available but * we at least have read access to the device. * (See Microsoft Q241374: Read and Write Access Required for SCSI * Pass Through Requests) */ (HANDLE) dvdcss->i_fd = CreateFile( psz_dvd, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, NULL ); if( (HANDLE) dvdcss->i_fd == INVALID_HANDLE_VALUE ) (HANDLE) dvdcss->i_fd = CreateFile( psz_dvd, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, 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; /* TODO: !!! errors are mangled and disarded (-1/2048 = 0) * and partial reads are wrong,i.e 2200/2048 = 1 * but the location has advanced 2200 bytes (lseek possition that is) */ 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