From 7041a551b1f078e24a0cf75c9b76bd996965add1 Mon Sep 17 00:00:00 2001
From: Thomas Schmitt <scdbackup@gmx.net>
Date: Tue, 21 Oct 2008 11:26:16 +0000
Subject: [PATCH] Implemented in xorriso provisory 1 MB alignement for MBR
 enhanced ISO images

---
 xorriso/xorriso.c           | 1 +
 xorriso/xorriso_private.h   | 5 +++++
 xorriso/xorriso_timestamp.h | 2 +-
 xorriso/xorrisoburn.c       | 9 +++++++++
 4 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/xorriso/xorriso.c b/xorriso/xorriso.c
index fa317b48..f3ead8ab 100644
--- a/xorriso/xorriso.c
+++ b/xorriso/xorriso.c
@@ -3628,6 +3628,7 @@ int Xorriso_new(struct XorrisO ** xorriso,char *progname, int flag)
  m->speed= 0;
  m->fs= 4*512; /* 4 MiB */
  m->padding= 300*1024;
+ m->alignment= 0;
  m->do_stream_recording= 0;
  m->keep_boot_image= 0;
  m->patch_isolinux_image= 0;
diff --git a/xorriso/xorriso_private.h b/xorriso/xorriso_private.h
index 0a57c204..201da1cd 100644
--- a/xorriso/xorriso_private.h
+++ b/xorriso/xorriso_private.h
@@ -183,6 +183,11 @@ struct XorrisO { /* the global context of xorriso */
  int speed;     /* in libburn units : 1000 bytes/second , 0 = Max, -1 = Min */
  int fs;        /* fifo size in 2048 byte chunks : at most 1 GB */
  int padding;   /* number of bytes to add after ISO 9660 image */
+
+ int alignment; /* if > 0 : image size alignment in 2048 byt blocks */
+                /* <<< not sure whether to keep this after libisofs will have
+                       learned to pad up MBR images to full MB */
+
  int do_stream_recording;
 
  int keep_boot_image;
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index 2d60d55a..dee447ce 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2008.10.20.180747"
+#define Xorriso_timestamP "2008.10.21.112523"
diff --git a/xorriso/xorrisoburn.c b/xorriso/xorrisoburn.c
index 33f1278a..84125311 100644
--- a/xorriso/xorrisoburn.c
+++ b/xorriso/xorrisoburn.c
@@ -821,6 +821,13 @@ no_track:;
      Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "NOTE", 0);
    }
  }
+ if(xorriso->alignment > 0) {
+   if(img_sectors > 0)
+     padding+= xorriso->alignment
+               - ((img_sectors + padding) % xorriso->alignment);
+   else if(padding < xorriso->alignment)
+     padding= xorriso->alignment;
+ }
  burn_track_define_data(tracks[0], 0, padding * 2048, 0, BURN_MODE1);
  Xorriso_process_msg_queues(xorriso,0);
 
@@ -890,6 +897,7 @@ int Xorriso_set_isolinux_options(struct XorrisO *xorriso,
  if(make_isohybrid_mbr) {
    sprintf(xorriso->info_text, "Will write isohybrid MBR.");
    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "NOTE", 0);
+   xorriso->alignment= 512;
  }
 
  ret= el_torito_set_isolinux_options(bootimg, 1 | (make_isohybrid_mbr << 1),0);
@@ -982,6 +990,7 @@ int Xorriso_write_session(struct XorrisO *xorriso, int flag)
  }
  relax= isoburn_igopt_allow_deep_paths;
 
+ xorriso->alignment= 0;
  /* Activate, adjust or discard boot image */
  image= isoburn_get_attached_image(source_drive);
  /* >>> ??? move down to libisoburn ? */