/* * 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 "config.h" #include <stdlib.h> #include <stdio.h> #include <string.h> #include <fcntl.h> #ifdef HAVE_UNISTD_H # include <unistd.h> #endif #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 ); }