----------------------------------------------------------------------
Patch name: patches/patch.harddrive-32GiB-win32-hartmut
Author: Hartmut Birr (uploaded by cbothamy)
Date: 28 oct 2002

Detailed description:
This patch changes the offset for the lseeks within the disk image class 
from byte to sector units.
This patch also adds support for disk up to 32GiB under Win32 (NTFS only).

Patch was created with:
  cvs diff -u
Apply patch to what version:
  cvs checked out on 28 oct 2002
Instructions:
  To patch, go to main bochs directory.
  Type "patch -p0 < THIS_PATCH_FILE".
----------------------------------------------------------------------
Index: iodev/harddrv.cc
===================================================================
RCS file: /cvsroot/bochs/bochs/iodev/harddrv.cc,v
retrieving revision 1.87
diff -u -r1.87 harddrv.cc
--- iodev/harddrv.cc	27 Oct 2002 21:25:33 -0000	1.87
+++ iodev/harddrv.cc	28 Oct 2002 21:35:19 -0000
@@ -724,7 +724,7 @@
 		command_aborted (channel, BX_SELECTED_CONTROLLER(channel).current_command);
 	        GOTO_RETURN_VALUE ;
 	      }
-	      ret = BX_SELECTED_DRIVE(channel).hard_drive->lseek(logical_sector * 512, SEEK_SET);
+	      ret = BX_SELECTED_DRIVE(channel).hard_drive->lseek(logical_sector, SEEK_SET);
               if (ret < 0) {
                 BX_ERROR(("could not lseek() hard drive image file"));
 		command_aborted (channel, BX_SELECTED_CONTROLLER(channel).current_command);
@@ -1212,7 +1212,7 @@
 #if TEST_WRITE_BEYOND_END==2
 	    logical_sector += 100000;
 #endif
-	    ret = BX_SELECTED_DRIVE(channel).hard_drive->lseek(logical_sector * 512, SEEK_SET);
+	    ret = BX_SELECTED_DRIVE(channel).hard_drive->lseek(logical_sector, SEEK_SET);
             if (ret < 0) {
               BX_ERROR(("could not lseek() hard drive image file at byte %lu", logical_sector * 512));
 	      command_aborted (channel, BX_SELECTED_CONTROLLER(channel).current_command);
@@ -1896,7 +1896,7 @@
 #if TEST_READ_BEYOND_END==3
 	  logical_sector += 100000;
 #endif
-	  ret=BX_SELECTED_DRIVE(channel).hard_drive->lseek(logical_sector * 512, SEEK_SET);
+	  ret=BX_SELECTED_DRIVE(channel).hard_drive->lseek(logical_sector, SEEK_SET);
           if (ret < 0) {
             BX_ERROR (("could not lseek() hard drive image file, aborting"));
 	    command_aborted(channel, value);
@@ -3127,17 +3127,40 @@
 
 off_t default_image_t::lseek (off_t offset, int whence)
 {
-      return ::lseek(fd, offset, whence);
+#ifdef WIN32
+      LARGE_INTEGER pos;
+      DWORD dwResult;
+      pos.u.LowPart = offset << 9;
+      pos.u.HighPart = offset >> 23;
+      dwResult = SetFilePointer((HANDLE)_get_osfhandle(fd), pos.u.LowPart, &pos.u.HighPart, whence);
+      return dwResult == 0xffffffff && GetLastError() != NO_ERROR ? -1 : 0;
+#else     
+      return ::lseek(fd, offset * 512, whence);
+#endif
 }
 
 ssize_t default_image_t::read (void* buf, size_t count)
 {
+#ifdef WIN32
+      DWORD dwResult;
+      BOOL bResult;
+      bResult = ReadFile((HANDLE)_get_osfhandle(fd), buf, count, &dwResult, NULL);
+      return bResult ? count : 0;
+#else       
       return ::read(fd, buf, count);
+#endif      
 }
 
 ssize_t default_image_t::write (const void* buf, size_t count)
 {
+#ifdef WIN32
+      DWORD dwResult;
+      BOOL bResult;
+      bResult = WriteFile((HANDLE)_get_osfhandle(fd), buf, count, &dwResult, NULL);
+      return bResult ? count : 0;
+#else      
       return ::write(fd, buf, count);
+#endif      
 }
 
 #if BX_SPLIT_HD_SUPPORT
@@ -3195,9 +3218,9 @@
     if ((stat_buf.st_size % 512) != 0) {
       BX_PANIC(("size of disk image must be multiple of 512 bytes"));
     }
-    length_table[i] = stat_buf.st_size;
-    start_offset_table[i] = start_offset;
-    start_offset += stat_buf.st_size;
+    length_table[i] = stat_buf.st_size / 512;
+    start_offset_table[i] = start_offset / 512;
+    start_offset += stat_buf.st_size / 512;
     increment_string (pathname);
   }
   // start up with first image selected
@@ -3219,8 +3242,6 @@
 
 off_t concat_image_t::lseek (off_t offset, int whence)
 {
-  if ((offset % 512) != 0) 
-    BX_PANIC( ("lseek HD with offset not multiple of 512"));
   BX_DEBUG(("concat_image_t.lseek(%d)", whence));
   // is this offset in this disk image?
   if (offset < thismin) {
@@ -3256,7 +3277,7 @@
   }
 
   seek_was_last_op = 1;
-  return ::lseek(fd, offset, whence);
+  return ::lseek(fd, offset * 512, whence);
 }
 
 ssize_t concat_image_t::read (void* buf, size_t count)
@@ -3329,7 +3350,7 @@
 
 off_t dll_image_t::lseek (off_t offset, int whence)
 {
-      vblk = offset >> 9;
+      vblk = offset;
       return 0;
 }