LBNL, I am sure you have posted about this before on here some weeks ago!
EDIT:
How about dumping the binary file as a HEX string array, searching the array for a pattern, finding your wanted end point and re-converting back to a binary file again?
Last edited by wisecracker; 08-14-2013 at 07:24 AM..
Reason: Added an addendum...
I've helped several times in this forum before and I know if somebody wants to help, helps. If somebody ask here there is not a forum rule to make attemtps before posting, due that sometimes the people just don't know where to begin. I'm asking and requesting help here (not complete solution) because I don't know in Python or any other language.
I only have the idea to extract the byte sequences searching regular expressions because not always the sequences are in the same position, but I don't know
in which language would be easier, faster, better and how to begin.
I'm using Ubuntu or Windows, but I'm asking for help and suggestions in bash if it possible or in Perl, Python, C or any language to handle binaries and be able
to extract the byte sequences I mention.
Maybe if someone knows how to do it in any language, could give some examples to follow and continue by myself.
I posted before but now I ask thinking in another approach, but still searching the way to extract the info reading the binary directly
without converting to text.
Thanks in advance for any help.
Last edited by Ophiuchus; 08-15-2013 at 02:58 AM..
Is the number of bytes between the start (0x32) and end (0xff 0x33) constant?
Also, whats the significance of the blocks? Can the requested data is present outside the block, in which case you are not interested?
Are there multiple instances of the required data within a block?
I can provide a solution in C. I am not good at python.
--ahamed
Last edited by ahamed101; 08-15-2013 at 05:39 AM..
The number of bytes are not constant between the start (0x32) and end (0xff 0x33)
The requested data is only inside each block:
I'm interested in:
1- The sequence in color inmediately after the beginning of each block, I mean after each 0x32 marked in red in image attached. These sequences always happens only once in each block.
2- Some of the sequences after the FF 34 in each block, these sequences not always happens but if happens only do once in each block. For example, in the sample file, the sequences after FF 34 only appear in block #2.
But maybe for now you can help with the sequences of item "1" and after that
I'll try to replicate the logic you use for sequences of item "2" or ask in order to be able to complete the 2nd item.
Well, there is nothing which mentions the end of each block. 0xff 0x33 represents the end of file, is that right?
Following code extracts the data from which you want, but there is no check for end of block as I am still confused. May be a larger file with expected output can clarify it.
Thank you for your help!!, I'll try your code to begin with no doubt.
And yes, FF 33 is the end of the file, after the 33 follow some bytes that represent the date and hour, not of interest. 0x33 is iso coded, so in ascii is the number 3.
For more details below is the main structure I mentioned in my 1rst post:
Code:
1- Each block begins with the hex 32 (1 byte) and ends with FF. After the FF of the last block, it follows 33.
2- Next sequence to extract is the correlative (3 bytes) --> I mean, 1, 2, 3...N
3- Next sequence to extract is Product Series (8 bytes) --> The first 4 bytes are always "99 11 45 27"
4- Next sequence to extract is Product Model (8 bytes) --> The first 2 bytes are always "73 49"
Thank you for your help ahamed.
---------- Post updated at 03:05 PM ---------- Previous update was at 01:07 PM ----------
Hello again ahamed,
It works nice!
Now for each block I try to extract (if present) the bytes after the FF 34 and begins with 0x03 followed by 0x80 or 0x81or 0x83 or 0x86 or 0x87 more 16 bytes more how it is shown in image attched in previous post.
I've added a new line as below:
Code:
static unsigned char pat3[] = {0x03, 0x8};
But how to include it in the "if" statement and extract those bytes only when the 0x03 0x8Z (where Z could be 0,1,3,6,7) appears after the occurrence of 0xFF 0x34?
For each block I'd like to have one line in put file.
I sat down yesterday to write this script and have just realised that my methodology is broken........
In essense I have.....
----------------------------------------------------------------- (This line really is in the file)
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MKVLWAALLVTFLAGCQAKVEQAVETEPEPELRQQTEWQSGQRWELALGRFWDYLRWVQT
LSEQVQEELLSSQVTQELRALMDETMKELKAYKSELEEQLTPVAEETRARLSKELQAAQA
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tgtgcacactacacatgactagtatgtgcacactacacatgactagta
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so on
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Your help is greatly appreciated!!
Best Regards,
Naveen. (1 Reply)