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Re: [Libcdio-devel] [PATCH v2] add multi extent ISO9660 file support to
From: |
Thomas Schmitt |
Subject: |
Re: [Libcdio-devel] [PATCH v2] add multi extent ISO9660 file support to libcdio |
Date: |
Wed, 27 Jun 2018 10:35:33 +0200 |
Hi,
the production of a small multi-extent ISO is remarkably easy thanks to
my predecessor in libisofs, Vreixo Formoso.
On GNU/Linux (and probably with Cygwin too):
wget https://www.gnu.org/software/xorriso/xorriso-1.4.8.tar.gz
tar xzf xorriso-1.4.8.tar.gz
cd xorriso-1.4.8
Change in file libisofs/ecma119.h :
-#define MAX_ISO_FILE_SECTION_SIZE 0xffffffff
+#define MAX_ISO_FILE_SECTION_SIZE 10239
-#define ISO_EXTENT_SIZE 0xFFFFF800
+#define ISO_EXTENT_SIZE (MAX_ISO_FILE_SECTION_SIZE - 2047)
MAX_ISO_FILE_SECTION_SIZE must be a multiple of 2048 minus 1,
so that ISO_EXTENT_SIZE becomes a multiple of 2048.
Build xorriso (no need to install it system-wide):
./configure ; make
Create the ISO (xorriso in native mode does not truncate existing ISOs
to 0 size)
test -e test.iso && rm test.iso
xorriso/xorriso -outdev test.iso -map xorriso/opts_i_o.c /multi_extent_file
The file opts_i_o.c has ~ 54 KB of size.
Let's look at the resulting extents list
xorriso/xorriso -indev test.iso -find /multi_extent_file -exec report_lba --
yields
Report layout: xt , Startlba , Blocks , Filesize , ISO image path
File data lba: 0 , 55 , 4 , 54305 , '/multi_extent_file'
File data lba: 1 , 59 , 4 , 54305 , '/multi_extent_file'
File data lba: 2 , 63 , 4 , 54305 , '/multi_extent_file'
File data lba: 3 , 67 , 4 , 54305 , '/multi_extent_file'
File data lba: 4 , 71 , 4 , 54305 , '/multi_extent_file'
File data lba: 5 , 75 , 4 , 54305 , '/multi_extent_file'
File data lba: 6 , 79 , 3 , 54305 , '/multi_extent_file'
The Linux kernel accepts it:
mount test.iso /mnt/iso
and obviously represents its content correctly. No difference to see by
diff /mnt/iso/multi_extent_file xorriso/opts_i_o.c
-----------------------------------------------------------------------------
Pete:
If you have problems to do this on your system, give me a note so that i
upload such an image for you. gzipped size is 12843 bytes.
Have a nice day :)
Thomas
- [Libcdio-devel] [PATCH v2] add multi extent ISO9660 file support to libcdio, Pete Batard, 2018/06/25
- Re: [Libcdio-devel] [PATCH v2] add multi extent ISO9660 file support to libcdio, Thomas Schmitt, 2018/06/27
- Re: [Libcdio-devel] [PATCH v2] add multi extent ISO9660 file support to libcdio,
Thomas Schmitt <=
- [Libcdio-devel] ABI problem with: [PATCH v2] add multi extent ISO9660 file support to libcdio, Thomas Schmitt, 2018/06/27
- Re: [Libcdio-devel] ABI problem with: [PATCH v2] add multi extent ISO9660 file support to libcdio, Pete Batard, 2018/06/27
- [Libcdio-devel] ABI problem with: [PATCH v2] add multi extent ISO9660 file support to libcdio, Thomas Schmitt, 2018/06/27
- Re: [Libcdio-devel] ABI problem with: [PATCH v2] add multi extent ISO9660 file support to libcdio, Pete Batard, 2018/06/27
- [Libcdio-devel] ABI problem with: [PATCH v2] add multi extent ISO9660 file support to libcdio, Thomas Schmitt, 2018/06/27
- Re: [Libcdio-devel] ABI problem with: [PATCH v2] add multi extent ISO9660 file support to libcdio, Rocky Bernstein, 2018/06/27
- Re: [Libcdio-devel] ABI problem with: [PATCH v2] add multi extent ISO9660 file support to libcdio, Pete Batard, 2018/06/27
- Re: [Libcdio-devel] ABI problem with: [PATCH v2] add multi extent ISO9660 file support to libcdio, Thomas Schmitt, 2018/06/28
- Re: [Libcdio-devel] ABI problem with: [PATCH v2] add multi extent ISO9660 file support to libcdio, Adrian Reber, 2018/06/28
- Re: [Libcdio-devel] ABI problem with: [PATCH v2] add multi extent ISO9660 file support to libcdio, Pete Batard, 2018/06/27