04-07-2009
parsing a hex file
Goodmorning,
I have a hex encoded file that needs to be parsed to remove some bytes and write the remaining ones to a new file. Here is the top of the file as shown by a hex editor:
The first parse exercise is to remove bytes 0-87 such that the resulting file begins with byte 88 (in this file's case the first byte would contain 22 as shown).
The second exercise is to capture 512 bytes and then discard 16 bytes and then capture 512 and then discard 16 and so on until the end of the file.
The third and final exercise is to handle the bottom of the file where the last block after the discarded 16 bytes is less then 512 bytes but not a fixed number.
I have done scripts similar to this to handle text files, but I'm not sure even where to begin with a hex file working with byte positions. This is for a unix emulator (MKS Toolkit) running on a windows server.
Any assistance that can be provided to assist me in producing a script that does this would be greatly appreciated.
Thanks,
Last edited by philplasma; 04-07-2009 at 12:19 PM..
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LEARN ABOUT SUSE
base32hex
base32::hex(n) Base32 encoding base32::hex(n)
__________________________________________________________________________________________________________________________________________________
NAME
base32::hex - base32 extended hex encoding
SYNOPSIS
package require Tcl 8.4
package require base32::core ?0.1?
package require base32::hex ?0.1?
::base32::hex::encode string
::base32::hex::decode estring
_________________________________________________________________
DESCRIPTION
This package provides commands for encoding and decoding of strings into and out of the extended hex base32 encoding as specified in the
RFC 3548bis draft.
API
::base32::hex::encode string
This command encodes the given string in extended hex base32 and returns the encoded string as its result. The result may be padded
with the character = to signal a partial encoding at the end of the input string.
::base32::hex::decode estring
This commands takes the estring and decodes it under the assumption that it is a valid extended hex base32 encoded string. The
result of the decoding is returned as the result of the command.
Note that while the encoder will generate only uppercase characters this decoder accepts input in lowercase as well.
The command will always throw an error whenever encountering conditions which signal some type of bogus input, namely if
[1] the input contains characters which are not valid output of a extended hex base32 encoder,
[2] the length of the input is not a multiple of eight,
[3] padding appears not at the end of input, but in the middle,
[4] the padding has not of length six, four, three, or one characters,
CODE MAP
The code map used to convert 5-bit sequences is shown below, with the numeric id of the bit sequences to the left and the character used to
encode it to the right. The important feature of the extended hex mapping is that the first 16 codes map to the digits and hex characters.
0 0 9 9 18 I 27 R
1 1 10 A 19 J 28 S
2 2 11 B 20 K 29 T
3 3 12 C 21 L 30 U
4 4 13 D 22 M 31 V
5 5 14 E 23 N
6 6 15 F 24 O
7 7 16 G 25 P
8 8 17 H 26 Q
BUGS, IDEAS, FEEDBACK
This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category base32
of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for
either package and/or documentation.
KEYWORDS
base32, hex, rfc3548
COPYRIGHT
Copyright (c) Public domain
base32 0.1 base32::hex(n)