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New API call iso_util_decode_md5_tag(). Augmented checksum tag by self-MD5.

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This commit is contained in:
Thomas Schmitt
2009-08-14 16:32:10 +02:00
parent ba66a7896a
commit 9467f2e644
6 changed files with 158 additions and 13 deletions
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22
doc/checksums.txt
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@ -70,12 +70,13 @@ The next block after the array begins with the checksum tag and is padded
by 0-bytes. The tag is a single line of printable text and has the following
format:
libisofs_checksum_tag_v1 pos=... range_start=... range_size=... md5=... \n
libisofs_checksum_tag_v1 pos=# range_start=# range_size=# md5=# self=#\n
Example:
libisofs_checksum_tag_v1 pos=81552 range_start=32 range_size=81520 md5=f172b994e8eb565a011d220b2a8b7a19
libisofs_checksum_tag_v1 pos=81552 range_start=32 range_size=81520 md5=f172b994e8eb565a011d220b2a8b7a19 self=020975b2aa1189d455db2c09560b8732
There are four parameters:
There are five parameters. The first three are decimal numbers, the others
are strings of 32 hex digits.
pos=
gives the block address where the tag supposes itself to be stored.
@ -85,16 +86,23 @@ There are four parameters:
range_start=
The block address where the session is supposed to start. If this does not
match the session start on media then the image volume descriptors of the
image have been been relocated. (The latter can happen with overwriteable
media.)
match the session start on media then the volume descriptors of the
image have been relocated. (This can happen with overwriteable media. If
checksumming started at LBA 0 and finds range_start=32, then one has to
restart checksumming at LBA 32. See libburn/doc/cookbook.txt
"ISO 9660 multi-session emulation on overwriteable media" for background
information.)
range_size=
The number of blocks beginning at range_start which are covered by the
checksum of the tag.
md5=
The checksum of the tag. Encoded as 32 hex digits.
The checksum payload of the tag as lower case hex digits.
self=
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.