From 198fdd15e517c81d36a6c504d445682bcbb3363e Mon Sep 17 00:00:00 2001
From: Geoff Voelker <voelker@cs.washington.edu>
Date: Fri, 30 Jun 1995 21:15:19 +0000
Subject: [PATCH] (get_section_info): Set the end of the data region to be just
 before the start of the shared library data. (read_in_bss): Read directly
 into memory. (map_in_heap): Read directly into memory if unable to map.

---
 src/unexw32.c | 65 +++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 48 insertions(+), 17 deletions(-)

diff --git a/src/unexw32.c b/src/unexw32.c
index a29393aef74..cf89f031bb9 100644
--- a/src/unexw32.c
+++ b/src/unexw32.c
@@ -142,8 +142,8 @@ unexec (char *new_name, char *old_name, void *start_data, void *start_bss,
 
   /* The size of the dumped executable is the size of the original
      executable plus the size of the heap and the size of the .bss section.  */
-  heap_index_in_executable = round_to_next (in_file.size, 
-					    get_allocation_unit ());
+  heap_index_in_executable = (unsigned long)
+    round_to_next ((unsigned char *) in_file.size, get_allocation_unit ());
   size = heap_index_in_executable + get_committed_heap_size () + bss_size;
   open_output_file (&out_file, out_filename, size);
 
@@ -315,12 +315,20 @@ get_section_info (file_data *p_infile)
 	}
       if (!strcmp (section->Name, ".data")) 
 	{
+	  /* From lastfile.c  */
+	  extern char my_edata[];
+
 	  /* The .data section.  */
 	  ptr  = (char *) nt_header->OptionalHeader.ImageBase +
 	    section->VirtualAddress;
 	  data_start_va = ptr;
 	  data_start_file = section->PointerToRawData;
-	  data_size = get_section_size (section);
+
+	  /* We want to only write Emacs data back to the executable,
+	     not any of the library data (if library data is included,
+	     then a dumped Emacs won't run on system versions other
+	     than the one Emacs was dumped on).  */
+	  data_size = my_edata - data_start_va;
 	}
       section++;
     }
@@ -429,18 +437,12 @@ read_in_bss (char *filename)
   
   /* Ok, read in the saved .bss section and initialize all 
      uninitialized variables.  */
-  total_read = 0;
-  size = bss_size;
-  bss = bss_start;
-  while (ReadFile (file, buffer, 512, &n_read, NULL)) 
+  if (!ReadFile (file, bss_start, bss_size, &n_read, NULL))
     {
-      if (n_read == 0)
-	break;
-      memcpy (bss, buffer, n_read);
-      bss += n_read;
-      total_read += n_read;
+      i = GetLastError ();
+      exit (1);
     }
-    
+
   CloseHandle (file);
 }
 
@@ -451,7 +453,7 @@ map_in_heap (char *filename)
   HANDLE file;
   HANDLE file_mapping;
   void  *file_base;
-  unsigned long size, upper_size;
+  unsigned long size, upper_size, n_read;
   int    i;
 
   file = CreateFile (filename, GENERIC_READ, FILE_SHARE_READ, NULL,
@@ -467,17 +469,46 @@ map_in_heap (char *filename)
 				    0, size, NULL);
   if (!file_mapping) 
     {
-	i = GetLastError ();
-	exit (1);
+      i = GetLastError ();
+      exit (1);
     }
     
   size = get_committed_heap_size ();
   file_base = MapViewOfFileEx (file_mapping, FILE_MAP_COPY, 0, 
 			       heap_index_in_executable, size,
 			       get_heap_start ());
-  if (file_base == 0) 
+  if (file_base != 0) 
+    {
+      return;
+    }
+
+  /* If we don't succeed with the mapping, then copy from the 
+     data into the heap.  */
+
+  CloseHandle (file_mapping);
+
+  if (VirtualAlloc (get_heap_start (), get_committed_heap_size (),
+		    MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE) == NULL)
+    {
+      i = GetLastError ();
+      exit (1);
+    }
+
+  /* Seek to the location of the heap data in the executable.  */
+  i = heap_index_in_executable;
+  if (SetFilePointer (file, i, NULL, FILE_BEGIN) == 0xFFFFFFFF)
     {
       i = GetLastError ();
       exit (1);
     }
+
+  /* Read in the data.  */
+  if (!ReadFile (file, get_heap_start (), 
+		 get_committed_heap_size (), &n_read, NULL))
+    {
+      i = GetLastError ();
+      exit (1);
+    }
+
+  CloseHandle (file);
 }
-- 
2.39.2