From 9766c28d4f479e7bbc709df83b377b72a1823964 Mon Sep 17 00:00:00 2001
From: Thomas Schmitt <scdbackup@gmx.net>
Date: Mon, 5 Oct 2009 16:55:36 +0000
Subject: [PATCH] Avoided FAILURE event with welcoming empty disk files

---
 libisoburn/burn_wrap.c      |  8 ++++++--
 libisoburn/isofs_wrap.c     | 11 ++++++++---
 xorriso/xorriso_timestamp.h |  2 +-
 3 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/libisoburn/burn_wrap.c b/libisoburn/burn_wrap.c
index ec5fce20..554ee990 100644
--- a/libisoburn/burn_wrap.c
+++ b/libisoburn/burn_wrap.c
@@ -1047,7 +1047,7 @@ int isoburn_read_iso_head(struct burn_drive *d, int lba,
                           int *image_blocks, char *info, int flag)
 {
  unsigned char buffer[64*1024];
- int ret, info_mode;
+ int ret, info_mode, capacity;
  off_t data_count;
 
  info_mode= flag&255;
@@ -1055,8 +1055,12 @@ int isoburn_read_iso_head(struct burn_drive *d, int lba,
  if(flag&(1<<13)) {
    memcpy(buffer, info, 64*1024);
  } else {
-   ret = burn_read_data(d, ((off_t) lba) * (off_t) 2048, (char *) buffer,
+   ret = burn_get_read_capacity(d, &capacity, 0);
+   if(ret > 0 && (off_t) capacity * (off_t) 2048 >= (off_t) (64 * 1024)) {
+     ret = burn_read_data(d, ((off_t) lba) * (off_t) 2048, (char *) buffer,
                       (off_t) 64*1024, &data_count, 2); /* no error messages */
+  } else
+    ret= 0;
    if(ret<=0)
      return(-1*!!(flag&(1<<15)));
    if(info_mode==2)
diff --git a/libisoburn/isofs_wrap.c b/libisoburn/isofs_wrap.c
index 82c2c124..e3a75fb3 100644
--- a/libisoburn/isofs_wrap.c
+++ b/libisoburn/isofs_wrap.c
@@ -307,7 +307,7 @@ int isoburn_activate_session(struct burn_drive *drive)
 */
 int isoburn_start_emulation(struct isoburn *o, int flag)
 {
- int ret, i;
+ int ret, i, capacity;
  off_t data_count;
  struct burn_drive *drive;
  struct ecma119_pri_vol_desc *pvm;
@@ -323,8 +323,13 @@ int isoburn_start_emulation(struct isoburn *o, int flag)
 
  /* we can assume 0 as start block for image */
  /* TODO what about ms? where we validate valid iso image in ms disc? */
- ret = burn_read_data(drive, (off_t) 0, (char*)o->target_iso_head, 
-                      (off_t) Libisoburn_target_head_sizE, &data_count, 2);
+ ret = burn_get_read_capacity(drive, &capacity, 0);
+ if (ret > 0 &&
+     (off_t) capacity * (off_t) 2048 >= (off_t) Libisoburn_target_head_sizE) {
+   ret = burn_read_data(drive, (off_t) 0, (char*)o->target_iso_head, 
+                        (off_t) Libisoburn_target_head_sizE, &data_count, 2);
+ } else
+   ret = 0;
 
  /* an error means an empty disc */
  if (ret <= 0) {
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index a214c171..1bc5ae56 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2009.09.30.092640"
+#define Xorriso_timestamP "2009.10.05.165632"