Bug fix: stdio sizes > 4 TB - 32 kB caused integer rollover

cdrskin/cdrskin_timestamp.h

@@ -1 +1 @@
-#define Cdrskin_timestamP "2011.08.08.121355"
+#define Cdrskin_timestamP "2011.08.17.160854"

libburn/drive.c

@@ -374,6 +374,11 @@ int burn_drive_grab(struct burn_drive *d, int le)
 			if (stat_ret != -1 && S_ISREG(stbuf.st_mode) &&
 			    stbuf.st_size > 0) {
 				d->status = BURN_DISC_APPENDABLE;
+				if (stbuf.st_size / (off_t) 2048
+				    >= 0x7ffffff0) {
+					d->status = BURN_DISC_FULL;
+					d->role_5_nwa = 0x7ffffff0;
+				} else 
 					d->role_5_nwa = stbuf.st_size / 2048 +
 					              !!(stbuf.st_size % 2048);
 			} else
@@ -1464,14 +1469,15 @@ static int burn_drive__is_rdwr(char *fname, int *stat_ret,
 		st_ret = stat(fname, &stbuf);
 	if (st_ret != -1) {
 		is_rdwr = burn_os_is_2k_seekrw(fname, 0);
-		if (S_ISREG(stbuf.st_mode))
+		if (S_ISREG(stbuf.st_mode)) {
 			read_size = stbuf.st_size;
-		else if (is_rdwr) {
+			ret = 1;
+		} else if (is_rdwr)
 			ret = burn_os_stdio_capacity(fname, &read_size);
-			if (ret <= 0)
+		if (ret <= 0 ||
+		    read_size / (off_t) 2048 >= (off_t) 0x7ffffff0) 
 			read_size = (off_t) 0x7ffffff0 * (off_t) 2048;  
 	}
-	}
 
 	if (is_rdwr && fd >= 0) {
 		getfl_ret = fcntl(fd, F_GETFL);
@@ -1614,6 +1620,11 @@ int burn_drive_grab_dummy(struct burn_drive_info *drive_infos[], char *fname)
 			    (burn_drive_role_4_allowed & 8)) {
 				d->status = BURN_DISC_APPENDABLE;
 				d->block_types[BURN_WRITE_SAO] = 0;
+				if (stbuf.st_size / (off_t) 2048
+				    >= 0x7ffffff0) {
+					d->status = BURN_DISC_FULL;
+					d->role_5_nwa = 0x7ffffff0;
+				} else 
 					d->role_5_nwa = stbuf.st_size / 2048 +
 					              !!(stbuf.st_size % 2048);
 			} else {
@@ -2713,11 +2724,7 @@ int burn_disc_get_multi_caps(struct burn_drive *d, enum burn_write_types wt,
 		size = d->media_capacity_remaining;
 		burn_os_stdio_capacity(d->devname, &size);
 		burn_drive_set_media_capacity_remaining(d, size);
-
-		/* >>> This looks wrong ! */
-		/* >>> should add file size */
-		o->start_range_high = size;
-
+		o->start_range_high = d->media_capacity_remaining;
 		o->start_alignment = 2048; /* imposting a drive, not a file */
 		o->might_do_sao = 4;
 		o->might_do_tao = 2;
@@ -2732,10 +2739,7 @@ int burn_disc_get_multi_caps(struct burn_drive *d, enum burn_write_types wt,
 
 		/* >>> start_range_low = file size rounded to 2048 */;
 
-		/* >>> This looks wrong ! */
-		/* >>> should add file size */
-		o->start_range_high = size;
-
+		o->start_range_high = d->media_capacity_remaining;
 		o->start_alignment = 2048; /* imposting a drive, not a file */
 		if (s == BURN_DISC_APPENDABLE) {
 			if (wt == BURN_WRITE_SAO || wt == BURN_WRITE_RAW)
@@ -3148,10 +3152,13 @@ int burn_drive_find_by_thread_pid(struct burn_drive **d, pid_t pid,
 */
 int burn_drive_set_media_capacity_remaining(struct burn_drive *d, off_t value)
 {
+	if (value / (off_t) 2048 > (off_t) 0x7ffffff0)
+		value = ((off_t) 0x7ffffff0) * (off_t) 2048;
 	d->media_capacity_remaining = value;
 	return 1;
 }
 
+
 /* ts A81215 : API */
 int burn_get_read_capacity(struct burn_drive *d, int *capacity, int flag)
 {

libburn/libburn.h

@@ -1393,6 +1393,9 @@ int burn_disc_get_msc1(struct burn_drive *d, int *start_lba);
     An eventual start address from burn_write_opts_set_start_byte() will be
     subtracted from the obtained capacity estimation. Negative results get
     defaulted to 0.
+    If the drive is actually a file in a large filesystem or a large block
+    device, then the capacity is curbed to a maximum of 0x7ffffff0 blocks
+    = 4 TB - 32 KB.
     @param d The drive to query.
     @param o If not NULL: write parameters to be set on drive before query
     @return number of most probably available free bytes
@@ -3067,6 +3070,8 @@ int burn_random_access_write(struct burn_drive *d, off_t byte_address,
     can be read via burn_read_data() although some of them may never have been
     recorded. If tracks are recognizable then it is better to only read
     LBAs which are part of some track.
+    If the drive is actually a large file or block device, then the capacity
+    is curbed to a maximum of 0x7ffffff0 blocks = 4 TB - 32 KB.
     @param d            The drive from which to read
     @param capacity     Will return the result if valid
     @param flag         Bitfield for control purposes: Unused yet, submit 0.

libburn/transport.h

@@ -293,7 +293,9 @@ struct burn_drive
 	int media_lba_limit;
 
 	/* ts A81210 : Upper limit of readable data size,
-	               0x7fffffff = unknown */
+	               0x7fffffff = unknown
+	               0x7ffffff0 = 32 bit overflow, or unknown stdio size
+	 */
 	int media_read_capacity;
 
 	/* ts B10314 : Next Writeable Adress for drive_role == 5 */