Sweden-Number/dlls/krnl386.exe16/int25.c

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/*
* DOS interrupt 25h handler
*
* Copyright 1997 Andreas Mohr
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdlib.h>
2003-11-27 01:59:36 +01:00
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include "dosexe.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(int);
/***********************************************************************
* DOSVM_RawRead
*
* Read raw sectors from a device.
*/
BOOL DOSVM_RawRead(BYTE drive, DWORD begin, DWORD nr_sect, BYTE *dataptr, BOOL fake_success)
{
WCHAR root[] = {'\\','\\','.','\\','A',':',0};
HANDLE h;
TRACE( "abs diskread, drive %d, sector %d, "
"count %d, buffer %p\n",
drive, begin, nr_sect, dataptr );
root[4] += drive;
h = CreateFileW(root, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS, NULL);
if (h != INVALID_HANDLE_VALUE)
{
DWORD r;
SetFilePointer(h, begin * 512, NULL, SEEK_SET );
/* FIXME: check errors */
ReadFile(h, dataptr, nr_sect * 512, &r, NULL );
CloseHandle(h);
}
else
{
memset( dataptr, 0, nr_sect * 512 );
if (fake_success)
{
/* FIXME: explain what happens here */
if (begin == 0 && nr_sect > 1) *(dataptr + 512) = 0xf8;
if (begin == 1) *dataptr = 0xf8;
}
else
return FALSE;
}
return TRUE;
}
/**********************************************************************
* DOSVM_Int25Handler
*
* Handler for int 25h (absolute disk read).
*/
void WINAPI DOSVM_Int25Handler( CONTEXT *context )
{
WCHAR drivespec[] = {'A', ':', '\\', 0};
BYTE *dataptr = CTX_SEG_OFF_TO_LIN( context, context->SegDs, context->Ebx );
DWORD begin;
DWORD length;
drivespec[0] += AL_reg( context );
if (GetDriveTypeW( drivespec ) == DRIVE_NO_ROOT_DIR ||
GetDriveTypeW( drivespec ) == DRIVE_UNKNOWN)
{
SET_CFLAG( context );
SET_AX( context, 0x0201 ); /* unknown unit */
return;
}
if (CX_reg( context ) == 0xffff)
{
begin = *(DWORD *)dataptr;
length = *(WORD *)(dataptr + 4);
dataptr = (BYTE *)CTX_SEG_OFF_TO_LIN( context,
*(WORD *)(dataptr + 8),
*(DWORD *)(dataptr + 6) );
}
else
{
begin = DX_reg( context );
length = CX_reg( context );
}
DOSVM_RawRead( AL_reg( context ), begin, length, dataptr, TRUE );
RESET_CFLAG( context );
}