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Top Forums UNIX for Advanced & Expert Users How to determine the encoding of this dd image? Post 302905913 by NICEPeppino on Monday 16th of June 2014 04:08:17 AM
Old 06-16-2014
Gnome How to determine the encoding of this dd image?

I have extracted a raw data file from a magnetic tape using the dd command

Afterwards, I managed to read the extracted data with Bless HexEditor and I found out that at offset 0x200000 there is a sequence of value which originally was stored in a table.

I would like to extract this data and import it in an Excel or CSV file, but above all I would like to understand the data encryption.

This is an example of the data extracted in hexadecimal format and its representation in unsigned int little endian:
Code:
//Hex Not.    // Little-Endian unsigned int 32
10 00 00 00   // 84       (Ref Number)  
55 F1 2E 04   // 20070306 (Date)
A2 3F 32 01   // 15144184 (Time)
F8 14 E7 00   // 20070306 (Date)
A2 3F 32 01   // 15491037 (Time)
DD 5F EC 00   // 1
01 00 00 00   // 1
01 00 00 00   // 4486656
00 76 44 00   // 492
EC 01 00 00   // 1
01 00 00 00   // 814185724
FC 7C 87 30   // 814185728
00 7D 87 30   // 814185732
04 7D 87 30   // 16

New Line

10 00 00 00   // 84
55 F1 2E 04   // 20070306
A2 3F 32 01   // 15491037
DD 5F EC 00   // 20070306
A2 3F 32 01   // 15534889
29 0B ED 00   // 18
12 00 00 00   // 1
01 00 00 00   // 4486656
00 76 44 00   // 492
EC 01 00 00   // 1
01 00 00 00   // 814185724
FC 7C 87 30   // 814185728
00 7D 87 30   // 814185732
04 7D 87 30   // 16

Can you understand starting from this piece of converted data how the raw file is encoded and how I can create a bash script to decode it??

Thanks

Moderator's Comments:
Mod Comment Please use code tags next time for your code and data. Thanks

Last edited by NICEPeppino; 07-30-2014 at 08:03 AM..
 

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_decodedecimal64(3M)													      _decodedecimal64(3M)

NAME
_decodedecimal64(), _decodedecimal128(), _decodedecimal32() - decode decimal-encoded decimal data SYNOPSIS
DESCRIPTION
There are two standard bit-encodings for decimal floating-point data: binary and decimal. Both encoding provide exactly the same data (analogous to big endian and little endian encodings). The HP-UX decimal floating-point types use the binary encoding. The function decodes x, interpreted as a decimal-encoded 64-bit decimal datum, into the encoding for is a version of it takes a argument and returns a result. is a version of it takes a argument and returns a result. These math functions are supported for HP-UX 11i Version 3 September 2008 Update and forward. USAGE
To use any of these functions, compile with the option. Make sure your program defines and then includes Link in the math library by specifying or on the linking command line. For more information, see the at the following site: RETURN VALUE
returns x in the encoding for raises no exceptions. ERRORS
No errors are defined. SEE ALSO
_decodebinary64(3M), _encodebinary64(3M), _encodedecimal64(3M), math(5). STANDARDS CONFORMANCE
These functions are not specified in any standard. HP Integrity Server Only _decodedecimal64(3M)
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