Changeset 3068

Timestamp:

Jul 18, 2012 4:56:18 AM (10 months ago)

Author:

quozl

Message:

disklabel - support ISO 9660 images on non-optical drives such as USB flash and hard drives, by using a logical sector offset to the primary volume descriptor that is consistent with the 512 byte sector size on these devices. ISO 9660:1999 6.1.2 specifies minimum logical sector size, and an offset of 16 sectors to the primary volume descriptor, but does not specify arrangement of data on devices that are not a CD-ROM. Common use is to place the image on other devices in the same way it appears on CD-ROM. #12018

Location:

ofw

Files:

• disklabel/common.fth (modified) (1 diff)
• fs/cdfs/partition.fth (modified) (1 diff)

ofw/disklabel/common.fth

@@ -20 +20 @@
 0 instance value sector-offset
 
-\ For ISO-9660 CD-ROMs
+\ For ISO-9660 CD-ROMs, ISO-9660 flash or hard drives, and GPT
 : read-hw-sector  ( sector# -- )
    sector-offset +  /sector um*  " seek" $call-parent  abort" Seek failed"

ofw/fs/cdfs/partition.fth

@@ -5 +5 @@
 \ system volume, as determined by reading the primary volume descriptor.
 : iso-9660?  ( -- flag )
-   d# 16  ['] read-hw-sector catch  if  drop false exit  then
+   d# 16  /sector h# 200 =  if  4*  then
+   ['] read-hw-sector catch  if  drop false exit  then
    sector-buf c@ 1 =  sector-buf 1+ 5 " CD001"  $=  and  dup  if   ( flag )
       iso-type to partition-type