Trying to find out whether READ CAPACITY on CD media includes 2 TAO end blocks

cdrskin/cdrskin_timestamp.h

@@ -1 +1 @@
-#define Cdrskin_timestamP "2016.02.18.114857"
+#define Cdrskin_timestamP "2016.03.08.073402"

libburn/drive.c

@@ -419,6 +419,7 @@ int burn_drive_grab_stdio(struct burn_drive *d, int flag)
 		/* despite its name : last valid address, not size */
 		d->media_read_capacity =
 					read_size / 2048 - !(read_size % 2048);
+		d->mr_capacity_trusted = 1;
 		if ((stat_ret == -1 || is_rdwr) && d->devname[0]) { 
 		       	ret = burn_os_stdio_capacity(d->devname, 0, &size);
 			if (ret > 0)
@@ -1782,10 +1783,12 @@ int burn_drive_grab_dummy(struct burn_drive_info *drive_infos[], char *fname)
 		strcpy(d->current_profile_text,"stdio file");
 		d->current_is_cd_profile = 0;
 		d->current_is_supported_profile = 1;
-		if (read_size >= 0)
+		if (read_size >= 0) {
 			/* despite its name : last valid address, not size */
 			d->media_read_capacity =
 				read_size / 2048 - !(read_size % 2048);
+			d->mr_capacity_trusted = 1;
+		}
 		burn_drive_set_media_capacity_remaining(d, size);
 	} else
 		d->current_profile = 0; /* Drives return this if empty */
@@ -3322,7 +3325,8 @@ int burn_drive_set_media_capacity_remaining(struct burn_drive *d, off_t value)
 /* ts A81215 : API */
 int burn_get_read_capacity(struct burn_drive *d, int *capacity, int flag)
 {
-	*capacity = d->media_read_capacity + 1;
+	*capacity = d->media_read_capacity +
+			(d->media_read_capacity != 0x7fffffff);
 	return (d->media_read_capacity != 0x7fffffff);
 }
 

libburn/libburn.h

@@ -1,7 +1,7 @@
 /* -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 8; -*- */
 
 /* Copyright (c) 2004 - 2006 Derek Foreman, Ben Jansens
-   Copyright (c) 2006 - 2015 Thomas Schmitt <scdbackup@gmx.net>
+   Copyright (c) 2006 - 2016 Thomas Schmitt <scdbackup@gmx.net>
    Provided under GPL version 2 or later.
 
    This is the official API definition of libburn.
@@ -3935,7 +3935,7 @@ int burn_random_access_write(struct burn_drive *d, off_t byte_address,
 
 /* ts A81215 */
 /** Inquire the maximum amount of readable data.
-    It is supposed that all LBAs in the range from 0 to media_read_acpacity-1
+    It is supposed that all LBAs in the range from 0 to capacity - 1
     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.

libburn/mmc.c

@@ -1485,6 +1485,20 @@ ex:;
 }
 
 
+static int mmc_register_leadout(struct burn_drive *d, int *highest_leadout,
+                             int toc_idx)
+{
+	int lba;
+
+	lba = burn_msf_to_lba(d->toc_entry[toc_idx].pmin,
+				d->toc_entry[toc_idx].psec,
+				d->toc_entry[toc_idx].pframe);
+	if (lba > *highest_leadout)
+		*highest_leadout = lba;
+	return 1;
+}
+
+
 static int mmc_read_toc_al(struct burn_drive *d, int *alloc_len)
 {
 /* read full toc, all sessions, in m/s/f form, 4k buffer */
@@ -1494,7 +1508,7 @@ static int mmc_read_toc_al(struct burn_drive *d, int *alloc_len)
 	struct buffer *buf = NULL;
 	struct command *c = NULL;
 	int dlen;
-	int i, old_alloc_len, t_idx, ret;
+	int i, old_alloc_len, t_idx, ret, highest_leadout = -1;
 	unsigned char *tdata;
 	char *msg = NULL;
 
@@ -1652,9 +1666,12 @@ static int mmc_read_toc_al(struct burn_drive *d, int *alloc_len)
 			d->disc->session[tdata[0] - 1]->firsttrack = tdata[8];
 		if (tdata[3] == 0xA1)
 			d->disc->session[tdata[0] - 1]->lasttrack = tdata[8];
-		if (tdata[3] == 0xA2)
+		if (tdata[3] == 0xA2) {
 			d->disc->session[tdata[0] - 1]->leadout_entry =
 				&d->toc_entry[i];
+			/* ts B60305 */
+			mmc_register_leadout(d, &highest_leadout, i);
+		}
 	}
 
 	/* ts A70131 : was (d->status != BURN_DISC_BLANK) */
@@ -1701,6 +1718,23 @@ static int mmc_read_toc_al(struct burn_drive *d, int *alloc_len)
 	/* A80808 */
 	burn_disc_cd_toc_extensions(d, 0);
 
+	/* ts B60304
+	   Most drives report READ CAPACITY of TAO CD too high by 2 blocks.
+	   TOC format 2 always reports 2 blocks more than are readable.
+	   So here it is possible to check and mark as trusted.
+	*/
+	if (highest_leadout > 0 && d->media_read_capacity != 0x7fffffff &&
+	    !d->mr_capacity_trusted) {
+		if (highest_leadout - 3 == d->media_read_capacity) {
+			d->mr_capacity_trusted = 1;
+			libdax_msgs_submit(libdax_messenger, d->global_index,
+				 0x00000002, LIBDAX_MSGS_SEV_DEBUG,
+				 LIBDAX_MSGS_PRIO_ZERO,
+	      "Trusting READ CAPACITY by 2 extra blocks in TOC. Assuming TAO.",
+				 0, 0);
+		}
+	}
+
 	ret = 1;
 ex:;
 	BURN_FREE_MEM(msg);
@@ -1909,6 +1943,7 @@ static int mmc_read_disc_info_al(struct burn_drive *d, int *alloc_len)
 
 	/* ts A81210 */
 	d->media_read_capacity = 0x7fffffff;
+	d->mr_capacity_trusted = -1;
 
 	/* ts A61202 */
 	d->toc_entries = 0;
@@ -4836,6 +4871,7 @@ int mmc_read_capacity(struct burn_drive *d)
 	BURN_ALLOC_MEM(buf, struct buffer, 1);
 	BURN_ALLOC_MEM(c, struct command, 1);
 	d->media_read_capacity = 0x7fffffff;
+	d->mr_capacity_trusted = -1;
 	mmc_start_if_needed(d, 1);
 	if (mmc_function_spy(d, "mmc_read_capacity") <= 0)
 		{ret = 0; goto ex;}
@@ -4853,6 +4889,10 @@ int mmc_read_capacity(struct burn_drive *d)
 		d->media_read_capacity = 0x7fffffff;
 		{ret = 0; goto ex;}
 	}
+	if (d->current_profile >= 0x08 && d->current_profile <= 0x0A)
+		d->mr_capacity_trusted = 0;
+	else
+		d->mr_capacity_trusted = 1;
 	ret = 1;
 ex:;
 	BURN_FREE_MEM(c);
@@ -5367,6 +5407,7 @@ int mmc_setup_drive(struct burn_drive *d)
 	d->media_capacity_remaining = 0;
 	d->media_lba_limit = 0;
 	d->media_read_capacity = 0x7fffffff;
+	d->mr_capacity_trusted = 0;
 	d->pessimistic_buffer_free = 0;
 	d->pbf_altered = 0;
 	d->wait_for_buffer_free = Libburn_wait_for_buffer_freE;

libburn/structure.c

@@ -749,10 +749,23 @@ int burn_session_get_hidefirst(struct burn_session *session)
 }
 
 
+static void burn_track_info_high_read(unsigned char *data,
+					int *higest_readable)
+{
+	int ret;
+
+	ret = mmc_four_char_to_int(data + 8) +
+	      mmc_four_char_to_int(data + 24);
+	if (ret - 1> *higest_readable)
+		*higest_readable = ret - 1;
+}
+
+
 /* ts A80808 : Enhance CD toc to DVD toc */
 int burn_disc_cd_toc_extensions(struct burn_drive *drive, int flag)
 {
 	int sidx= 0, tidx= 0, ret, track_offset, alloc_len = 34;
+	int higest_readable = -1;
 	struct burn_toc_entry *entry, *prev_entry= NULL;
 	struct burn_disc *d;
 	/* ts A81126 : ticket 146 : There was a SIGSEGV in here */
@@ -835,6 +848,9 @@ int burn_disc_cd_toc_extensions(struct burn_drive *drive, int flag)
 					    ((!drive->current_is_cd_profile) ||
 					   ret < prev_entry->track_blocks - 2))
 						prev_entry->track_blocks = ret;
+					if (!drive->mr_capacity_trusted)
+						burn_track_info_high_read(
+						  buf->data, &higest_readable);
 				}
 				prev_entry->extensions_valid |= 1;
 			}
@@ -847,6 +863,19 @@ int burn_disc_cd_toc_extensions(struct burn_drive *drive, int flag)
 			prev_entry = entry;
 		}
 	}
+
+	if (!drive->mr_capacity_trusted) {
+		if (higest_readable == drive->media_read_capacity - 2) {
+			drive->media_read_capacity = higest_readable;
+			drive->mr_capacity_trusted = 1;
+			libdax_msgs_submit(libdax_messenger,
+				drive->global_index, 0x00000002,
+				LIBDAX_MSGS_SEV_DEBUG, LIBDAX_MSGS_PRIO_ZERO,
+	"Corrected READ CAPACITY by READ TRACK INFORMATION. Assuming TAO.",
+				0, 0);
+		}
+	}
+
 	{ret = 1; goto ex;}
 failure:
 	libdax_msgs_submit(libdax_messenger, -1, 0x0002015f,

libburn/transport.h

@@ -369,6 +369,11 @@ struct burn_drive
 	               0x7ffffff0 = 32 bit overflow, or unknown stdio size
 	 */
 	int media_read_capacity;
+	/* ts B60305 : Whether READ CAPACITY of CD is credible:
+	               -1= no READ CAPACITY yet , 0= untrusted READ CAPACITY
+	               1= READ CAPACITY confirmed or corrected by other commands
+	*/
+	int mr_capacity_trusted;
 
 	/* ts B10314 : Next Writeable Adress for drive_role == 5 */
         int role_5_nwa;