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New API call iso_write_opts_set_scdbackup_tag()

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This commit is contained in:
Thomas Schmitt
2009-08-31 23:09:16 +02:00
parent 9cfa55345e
commit c992687200
6 changed files with 193 additions and 40 deletions
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13
doc/checksums.txt
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@ -67,8 +67,8 @@ The tree checksum tag is written after the ECMA-119 directory entries.
The session checksum tag is written after all payload including the checksum
array. (Then follows eventual padding.)
The tags are single lines of printable text, padded by 0 bytes. They have
the following format:
The tags are single lines of printable text at the very beginning of a block
of 2048 bytes. They have the following format:
Tag_id pos=# range_start=# range_size=# [session_start|next=#] md5=# self=#\n
@ -161,9 +161,14 @@ checksums as strings of 32 hex digits.
The MD5 checksum of the tag itself up to and including the last hex digit of
parameter "md5=".
The newline character at the end is mandatory. For now all bytes of the
block after that newline shall be zero. There may arise future extensions.
The newline character at the end is mandatory. After that newline there may
follow more lines. Their meaning is not necessarily described in this document.
One such line type is the scdbackup checksum tag, an ancestor of libisofs tags
which is suitable only for single session images which begin at LBA 0. It bears
a checksum record which by its MD5 covers all bytes from LBA 0 up to the
newline character preceding the scdbackup tag. See scdbackup/README appendix
VERIFY for details.
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