Move CD blank media to separate status field.

src/cdrom/cdrom.c

@@ -2801,7 +2801,7 @@ cdrom_read_disc_information(const cdrom_t *dev, uint8_t *buffer)
     int               ls_last    = 0;
     int               t_b0       = -1;
 
-    if (dev->cd_status == CD_STATUS_BLANK_CDR) {
+    if (dev->blank_media == CD_BLANK_CDR) {
         memset(buffer, 0x00, 34);
 
         buffer[ 0] = 0x00; /* Disc Information Length (MSB) */
@@ -3117,7 +3117,8 @@ cdrom_insert_blank(cdrom_t *dev, const char *fn)
         // All looking good, reset state
         dev->seek_pos = 0;
         dev->cd_buflen = 0;
-        dev->cd_status = CD_STATUS_BLANK_CDR;
+        dev->cd_status = CD_STATUS_DATA_ONLY;
+        dev->blank_media = CD_BLANK_CDR;
         dev->cdrom_capacity = 0;
         cdrom_log(dev->log, "Blank CD-R created\n");
         cdrom_insert(dev->id);

src/include/86box/cdrom.h

@@ -31,10 +31,11 @@
 #define CD_STATUS_HOLD              8
 #define CD_STATUS_DVD_REJECTED      16
 #define CD_STATUS_HAS_AUDIO         0xc
-#define CD_STATUS_BLANK_CDR         0x20
-#define CD_STATUS_BLANK_MASK        0x20
 #define CD_STATUS_MASK              0x2f
 
+#define CD_BLANK_NOT 0x00
+#define CD_BLANK_CDR 0x01
+
 /* Medium changed flag. */
 #define CD_STATUS_TRANSITION     0x40
 #define CD_STATUS_MEDIUM_CHANGED 0x80
@@ -310,6 +311,7 @@ typedef struct cdrom {
                                         Bit 1 = DMA supportd. */
     uint8_t            cd_status;    /* Struct variable reserved for
                                         media status. */
+    uint8_t            blank_media;
     uint8_t            speed;
     uint8_t            cur_speed;
 

src/scsi/scsi_cdrom.c

@@ -2643,7 +2643,7 @@ scsi_cdrom_command(scsi_common_t *sc, const uint8_t *cdb)
                 scsi_cdrom_not_ready(dev);
             else if (toc_format < 3) {
                 // Blank discs return invalid field when asked for a TOC
-                if (dev->drv->cd_status & CD_STATUS_BLANK_MASK) {
+                if (dev->drv->blank_media) {
                         scsi_cdrom_invalid_field(dev, toc_format);
                         break;
                 }
@@ -2658,12 +2658,12 @@ scsi_cdrom_command(scsi_common_t *sc, const uint8_t *cdb)
                     scsi_cdrom_set_buf_len(dev, BufLen, &len);
                     scsi_cdrom_data_command_finish(dev, len, len, len, 0);
                 }
-            } else if (toc_format == 3 && dev->drv->cd_status == CD_STATUS_BLANK_CDR) {
+            } else if (toc_format == 3 && dev->drv->blank_media == CD_BLANK_CDR) {
                 len = cdrom_read_pma(dev->drv, dev->buffer, max_len);
 
                 scsi_cdrom_set_buf_len(dev, BufLen, &len);
                 scsi_cdrom_data_command_finish(dev, len, len, len, 0);
-            } else if (toc_format == 4 && dev->drv->cd_status == CD_STATUS_BLANK_CDR) {
+            } else if (toc_format == 4 && dev->drv->blank_media == CD_BLANK_CDR) {
                 len = cdrom_read_atip(dev->drv, dev->buffer, max_len);
 
                 scsi_cdrom_set_buf_len(dev, BufLen, &len);
@@ -3661,6 +3661,14 @@ atapi_out:
             dev->buffer[6] = 8;
             len            = 8;
 
+            // Undo the overflow if disc capacity is blank
+            if (dev->drv->blank_media) {
+                dev->buffer[0] = 0x00;
+                dev->buffer[1] = 0x00;
+                dev->buffer[2] = 0x00;
+                dev->buffer[3] = 0x00;
+            }
+
             scsi_cdrom_log(dev->log, "CD-ROM Capacity: %08X\n",
                            dev->drv->cdrom_capacity - 1);