305 lines
13 KiB
Plaintext
305 lines
13 KiB
Plaintext
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libburnia-project.org scdbackup.sourceforge.net/xorriso_eng.html
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xorriso. By Thomas Schmitt <scdbackup@gmx.net>
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Integrated sub project of libburnia-project.org but also published via:
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http://scdbackup.sourceforge.net/xorriso_eng.html
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http://scdbackup.sourceforge.net/xorriso-0.4.2.pl00.tar.gz
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Copyright (C) 2006-2009 Thomas Schmitt, provided under GPL version 2.
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------------------------------------------------------------------------------
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xorriso is a program which copies file objects from POSIX compliant
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filesystems into Rock Ridge enhanced ISO 9660 filesystems and allows
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session-wise manipulation of such filesystems. It can load the management
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information of existing ISO images and it writes the session results to
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optical media or to filesystem objects.
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Vice versa xorriso is able to restore file objects from ISO 9660 filesystems.
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A special property of xorriso is that it needs neither an external ISO 9660
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formatter program nor an external burn program for CD or DVD but rather
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incorporates the libraries of libburnia-project.org .
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Currently it is fully supported on Linux with kernels >= 2.4 and on
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FreeBSD versions with ATAPI/CAM support enabled in the kernel, see atapicam(4).
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On other X/Open compliant systems there will only be POSIX i/o with disk
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file objects, but no direct MMC operation on CD/DVD/BD drives.
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By using this software you agree to the disclaimer at the end of this text:
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"... without even the implied warranty ..."
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Compilation, First Glimpse, Installation
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The most simple way to get xorriso from source code is the xorriso standalone
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tarball.
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Prerequisites:
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The tarball contains anything that is needed except the following system
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components:
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libc, libpthread
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plus on FreeBSD: libiconv, libcam
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Optional at compile time are:
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libreadline and the readline-dev headers make dialog mode more convenient.
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on Linux: libacl and libacl-devel allow getting and setting ACLs.
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zlib and zlib-devel allow zisofs compression.
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If they were present at compile time, then the optional libraries have to
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be present at runtime, too.
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Obtain xorriso-0.4.2.pl00.tar.gz, take it to a directory of your choice and do:
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tar xzf xorriso-0.4.2.pl00.tar.gz
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cd xorriso-0.4.2
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Within that directory execute:
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./configure --prefix=/usr
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make
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This will produce a binary named
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./xorriso/xorriso
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which you may strip to reduce it in size
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strip ./xorriso/xorriso
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You may copy or move it to a directory where it can be found by the shell,
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or you may execute xorriso at the place where it was built,
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or you may execute as superuser:
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make install
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For general concepts, options and usage examples see
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man 1 xorriso
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This man page is part of the tarball as
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xorriso/xorriso.1
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You may get a first glimpse by
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man ./xorriso/xorriso.1
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It gets installed with "make install" but may also be placed manually in the
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./man1 directory below one of the directories mentioned in environment
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variable $MANPATH.
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The installation creates several alias links pointing to the xorriso binary:
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xorrisofs starts xorriso with -as mkisofs emulation already enabled
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xorrecord starts xorriso with -as cdrecord emulation already enabled
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osirrox starts with -osirrox image-to-disk copying already enabled
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If you want to avoid dependecy on libreadline although the libreadline
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development package is installed, then rather build xorriso by:
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./configure --prefix=/usr --disable-libreadline
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make clean ; make
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Never omit the "make clean" command after switching libreadline enabling.
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Other deliberate dependency reduction options of ./configure are:
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--disable-libacl avoid use of ACL functions like acl_to_text()
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--disable-xattr avoid use of xattr functions like listxattr()
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--disable-zlib avoid use of zlib functions like compress2()
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xorriso allows to use external processes as file content filters. This is
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a potential security risk which may be avoided by ./configure option
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--disable-external-filters
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By default the filter feature is disabled if effective user id and real
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user id differ. This ban can be lifted by
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--enable-external-filters-setuid
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If you want xorriso to report a "Build timestamp" with its option -version:
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make buildstamped
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Drives and Disk File Objects
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The user of libisoburn applications needs rw-permission for the CD/DVD/BD
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drives which shall be used, even if only reading is intended.
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A list of rw-accessible drives can be obtained by
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xorriso -devices
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CD devices which offer no rw-permission are invisible to normal users.
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The superuser should be able to see any usable drive and then set the
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permissions as needed.
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The output of xorriso -devices might look like
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0 -dev '/dev/sr0' rwrw-- : 'TSSTcorp' 'CDDVDW SH-S203B'
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1 -dev '/dev/hda' rwrw-- : 'HL-DT-ST' 'DVD-ROM GDR8162B'
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Full and insecure enabling of both for everybody would look like
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chmod a+rw /dev/sr0 /dev/hda
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This is equivalent to the traditional setup chmod a+x,u+s cdrecord.
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I strongly discourage to run xorriso with setuid root or via sudo !
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It is not checked for the necessary degree of hacker safety.
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Consider to put all authorized users into group "floppy", to chgrp the
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device file to that group and to disallow w-access to others.
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A possible source of problems are hald or other automounters.
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If you can spot a process "hald-addon-storage" with the address of
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your desired drive, then consider to kill it.
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If you cannot get rid of the automounter that easily, try whether it helps
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to always load the drive tray manually before starting a write run of
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xorriso. Wait until the drive light is off.
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Better try to unmount an eventually mounted media before a write run.
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Besides true optical drives, xorriso can also address disk files as input or
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output drives. By default paths to files under /dev are accepted only if the
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device represents a real optical drive. Other device files may be addressed
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by prepending "stdio:" to the path.
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Like:
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xorriso -dev stdio:/dev/sdb ...more arguments...
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This rule may be changed by xorriso option -drive_class.
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Prefix "mmc:" causes a path to be accepted only if it is a real optical drive
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which is accessible by generic SCSI/MMC commands.
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Testing
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We are quite sure that libisofs produces accurate representations of the disk
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files. This opinion is founded on a lot of test burns and checks by a little
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test program which compares files from the mounted image with the orignals
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on disk. It uses the normal POSIX filesystem calls, i.e. no libburnia stuff.
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This program is not installed systemwide but stays in the installation
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directory of the xorriso tarball as test/compare_file . Usually it is
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run as -exec payload of a find command. It demands at least three arguments:
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The path of the first file to compare, the prefix1 to be cut off from path
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and the prefix2 which gets prepended afterwards to obtain the path of the
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second file to compare.
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As further argument there can be -no_ctime which suppresses the comparison
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of ctime date stamps.
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The exit value is 0 if no difference was detected, non-0 else.
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Example: After
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xorriso ... -pathspecs on -add /=/original/dir -- -commit_eject all
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mount /media/dvd
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cd test
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compare tree /media/dvd with tree /original/dir :
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find /original/dir -exec ./compare_file '{}' /original/dir /media/dvd ';' \
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and vice versa:
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find /media/dvd -exec ./compare_file '{}' /media/dvd /original/dir ';' \
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File Formats
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Sector Maps
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Sector maps describe the valid and invalid blocks on a media or a disk copy of
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a media. xorriso creates and reads these file with its option -check_media.
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The file begins with 32 bytes of cleartext of which the last one is a
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newline character. The first 25 say "xorriso sector bitmap v2 ", the
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remaining six characters give the size of the info text as decimal number.
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This number of bytes follows the first 32 and will not be interpreted
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by xorriso. They are rather to inform a human reader about the media type
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and its track layout.
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After the info text there are two 4 byte signed integers, most significant
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byte first. The first one, N, gives the number of bits in the following bitmap
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and the second number S gives the number of 2 KiB blocks governed by a single
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bit in the map. Then come the bits in form of 8-bit bytes.
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Data block M is covered by bit B=M/S in the map, bit number B is stored in
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byte B/8 as bit B%8. A valid readable data block has its bit set to 1.
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Checksum Tags
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Checksum tags are data blocks inside an ISO 9660 image which do not belong to
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any file but rather tell the MD5 of a certain range of data blocks.
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The superblock checksum tag is written after the ECMA-119 volume descriptors.
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The tree checksum tag is written after the ECMA-119 directory entries.
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The session checksum tag is written after all payload including the checksum
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array. (Then follows eventual padding.)
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The tags are single lines of printable text, padded by 0 bytes. They have
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the following format:
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Tag_id pos=# range_start=# range_size=# [session_start|next=#] md5=# self=#\n
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Parameters md5= and self= are 32 digit hex, the others are decimal numbers.
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Tag_id distinguishes the following tag types
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"libisofs_rlsb32_checksum_tag_v1" Relocated 64 kB superblock tag
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"libisofs_sb_checksum_tag_v1" Superblock tag
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"libisofs_tree_checksum_tag_v1" Directory tree tag
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"libisofs_checksum_tag_v1" Session tag
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A relocated superblock may appear at LBA 0 of an image which was produced for
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being stored in a disk file or on overwriteable media (e.g. DVD+R, BD-RE).
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xorriso records a first session recorded with its superblock at LBA 32 and
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the may follow at the next block address after the session tag which is
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divisible by 32. Normally no session starts after the address given by
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relocated superblock parameter session_start=.
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Session oriented media like CD-R[W], DVD+R, BD-R will have no relocated
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superblock but rather bear a table-of-content on media level.
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A tag is valid if pos= tells its own block address and self= tells its own MD5
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up to the last hex digit of md5=. range_start= tells the first block that is
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covered by md5=, range_size= tells the number of blocks covered by md5=.
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Relocated superblocks tell the block address of their session by session_start=.
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Superblock and tree tag tell the block address of the next tag by next=.
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The newline character at the end is mandatory.
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libisoburn
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xorriso is based on libisofs which does ISO 9600 filesystem aspects and on
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libburn which does the input and output aspects. Parts of this foundation
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are accessed via libisoburn, which is closely related to xorriso.
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libisoburn provides two services:
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- Encapsulation of coordination between libisofs and libburn.
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- Emulation of ISO 9660 multi-session on overwriteable media
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or random access files.
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The sourcecode of all three libraries is included in the xorriso standalone
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tarball. It is compiled with xorriso and linked statically.
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But you may as well get and install releases of libburn and libisofs, in order
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to be able to install a release of libisoburn which produces libisoburn.so.1
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and a matching dynamically linked xorriso binary.
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This binary is leaner but depends on properly installed libraries of suitable
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revision.
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Dynamic library and compile time header requirements for libisoburn-0.4.0 :
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- libburn.so.4 , version libburn-0.7.0 or higher
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- libisofs.so.6 , version libisofs-0.6.22 or higher
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libisoburn and xorriso will not start with libraries which are older than their
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headers seen at compile time. So compile in the oldest possible installation
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setup unless you have reason to enforce a newer bug fix level.
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Standalone xorriso has less runtime dependencies and can be moved more freely.
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------------------------------------------------------------------------------
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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------------------------------------------------------------------------------
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Based on and sub project of:
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libburnia-project.org
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By Mario Danic <mario.danic@gmail.com>,
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Vreixo Formoso <metalpain2002@yahoo.es>
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Thomas Schmitt <scdbackup@gmx.net>
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Copyright (C) 2006-2009 Mario Danic, Vreixo Formoso, Thomas Schmitt.
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libburnia-project.org is inspired by and in other components still containing
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parts of old
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Libburn. By Derek Foreman <derek@signalmarketing.com> and
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Ben Jansens <xor@orodu.net>
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Copyright (C) 2002-2006 Derek Foreman and Ben Jansens
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