Bochs/bochs/patches/patch.guess-flp-img-size

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Patch name: patch.guess-flp-img-size
Author: Tal Benavidor
Date: June 11, 2002

Detailed description:

This is from [ #567595 ] guess floppy type from image file length.
Bryce remade the patch because it was corrupted by the SF upload somehow.
http://sourceforge.net/tracker/index.php?func=detail&aid=567595&group_id=12580&atid=312580

  this patch adds the ability to specify floppy image file name,
  without giving the floppy type (720, 1_44...).
  bochs will automatically determine the floppy type from the image size.
  example line from .bochsrc:
    floppya: image=a.img, status=inserted
  in the above example, a.img must already exist before bochs starts.

  in linux (and probably other unixes) you may do:
    floppya: image=/dev/fd0, status=inserted

  the problem is that a floppy should be in the drive when bochs starts.
  if you do
    floppya: image=/dev/fd0, status=ejected.
  and there is no floppy in the drive, bochs will panic.

  it doesn't seem to work on win2k (didn't check winnt) - after fseeking to
  the end of \\.\a: , ftell() returns 0.


Patch was created with:
  diff -U 3 bochs-1.4/main.cc bochs-1.4.work/main.cc -p

Apply patch to what version:
  release version 1.4

Instructions:
  To patch, go to main bochs directory.
  Type "patch -p0 < THIS_PATCH_FILE".
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Index: main.cc
===================================================================
RCS file: /cvsroot/bochs/bochs/main.cc,v
retrieving revision 1.144
diff -u -r1.144 main.cc
--- main.cc	22 Sep 2002 20:56:11 -0000	1.144
+++ main.cc	23 Sep 2002 04:12:04 -0000
@@ -1900,6 +1900,48 @@
   }
 }
 
+/*
+ * this supports the "floppyx: image=" option.
+ * the functions returns the type of the floppy
+ * image (1.44, 360, etc.), based on the image file size.
+ */
+int get_floppy_type_from_image(const char *filename)
+{
+  long file_size;
+  FILE *fp = fopen(filename, "rb");
+  if (!fp)
+  {
+    BX_PANIC(("could not open image file '%s'.", filename));
+    return BX_FLOPPY_NONE;
+  }
+
+  fseek(fp, 0, SEEK_END);  // TODO: check if return value != 0
+  file_size = ftell(fp);
+  fclose(fp);
+
+
+  switch (file_size)
+  {
+  case 737280:
+    return BX_FLOPPY_720K;
+
+  case 1228800:
+    return BX_FLOPPY_1_2;
+
+  case 1474560:
+  case 1720320:
+  case 1763328:
+    return BX_FLOPPY_1_44;
+
+  case 2949120:
+    return BX_FLOPPY_2_88;
+
+  default:
+    BX_PANIC(("could not determine floppy type from image file '%s'.", filename));
+    return BX_FLOPPY_NONE;
+  }
+}
+
   static void
 parse_line_formatted(char *context, int num_params, char *params[])
 {
@@ -1945,6 +1987,12 @@
 	bx_options.floppya.Opath->set (&params[i][5]);
         bx_options.floppya.Otype->set (BX_FLOPPY_360K);
         }
+     else if (!strncmp(params[i], "image=", 6)) {
+       /* "image=" means we should get floppy type from image */
+       bx_options.floppya.Opath->set (&params[i][6]);
+       bx_options.floppya.Otype->set (
+           get_floppy_type_from_image(&params[i][6]) );
+       }
       else if (!strncmp(params[i], "status=ejected", 14)) {
         bx_options.floppya.Ostatus->set (BX_EJECTED);
         }
@@ -1979,6 +2027,12 @@
       else if (!strncmp(params[i], "360k=", 5)) {
 	bx_options.floppyb.Opath->set (&params[i][5]);
         bx_options.floppyb.Otype->set (BX_FLOPPY_360K);
+        }
+      else if (!strncmp(params[i], "image=", 6)) {
+        /* "image=" means we should get floppy type from image */
+        bx_options.floppyb.Opath->set (&params[i][6]);
+        bx_options.floppyb.Otype->set (
+            get_floppy_type_from_image(&params[i][6]) );
         }
       else if (!strncmp(params[i], "status=ejected", 14)) {
         bx_options.floppyb.Ostatus->set (BX_EJECTED);