In some test cases, I used tools like "dd" and "shed" to manually read a block from the disk, modify it using a hex editor and write it back using "dd".
I need help with some linux commands I can use to read the block and change the data to induce the corruption....as I want to automate my test case.
Thanks In Advance,
Prince Sharma
---------- Post updated at 05:39 AM ---------- Previous update was at 05:09 AM ----------
Test Scenario is like :
h)Using dd, copy out the contents of an EA block into a file.
i)Using shed editor, edit the contents at the offset 0004 to 00 instead of 01. This corrupts the EA header ref count.
j)Using dd, write back the contents of the modified block .
Plesae help me.
---------- Post updated at 06:29 AM ---------- Previous update was at 05:39 AM ----------
I do this to get a file with dumb block data.
Please help me with some shell command which I can use to read the dumb block data and modify it.
Last edited by jim mcnamara; 04-02-2013 at 09:24 AM..
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LEARN ABOUT DEBIAN
h5unjam
h5unjam(1) General Commands Manual h5unjam(1)NAME
h5unjam - Extract the user block from a HDF5 file
SYNOPSIS
h5unjam -i in_file.h5 [-u user_block | --delete] [-o out_file.h5]
DESCRIPTION
h5unjam splits an HDF5 file, writing the user block to a file or stdout and the HDF5 file to an HDF5 file with a header at byte 0 (i.e.,
with no user block).
If out_file.h5 is given, a new file is created with the in_file.h5 without the user block. In this case, infile.h5 is unchanged.
If out_file.h5 is not specified, the user_block is removed and in_file.h5 is rewritten, starting at byte 0.
If user_block is set, the user block will be written to user_block. If user_block is not set, the user block (if any) will be written to
stdout. If --delete is selected, the user block will not be not written.
EXAMPLE USAGE
For an HDF5 file, with_ub.h5, with a user block, extract the user block to user_block.txt and the HDF5 file to wo_ub.h5.
h5unjam -i with_ub.h5 -u user_block.txt -i wo_ub.h5
RETURN VALUE
h5unjam returns the size of the output file, or -1 if an error occurs.
CAVEATS
This tool copies all the data (sequentially) in the file(s) to new offsets. For a large file, this copy will take a long time.
The most efficient way to create a user block is to create the file with a user block (see H5Pset_user_block), and write the user block
data into that space from a program.
The user block is completely opaque to the HDF5 library and to the h5jam and h5unjam tools. The user block is simply read or written as a
string of bytes, which could be text or any kind of binary data. It is up to the user to know what the contents of the user block means
and how to process it.
When the user block is extracted, all the data is written to the output, including any padding or unwritten data.
This tool moves the HDF5 file through byte copies, i.e., it does not read or interpret the HDF5 objects.
SEE ALSO h5dump(1), h5ls(1), h5diff(1), h5import(1), gif2h5(1), h52gif(1), h5perf(1), h5jam(1).
h5unjam(1)