03-09-2020
Hi nezabudka.
This is an external file that we receive from a third party vendor and there's no guarantee that we will always have a space in between the fields (so NF-4 might not always work correctly).
I think it would be better to look for field value starting at column position#134 for 12 bytes and replace that value. Then we wouldn't need to be concerned if it's "DR" or "CR" or something else.
Unfortunately, I'm stuck on how to go about writing the code.
Let me know if you need any other clarifications.
Thanks
Paul
This User Gave Thanks to pchang For This Post:
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LEARN ABOUT DEBIAN
ndisasm
NDISASM(1) General Commands Manual NDISASM(1)
NAME
ndisasm - the Netwide Disassembler, an 80x86 binary file disassembler
SYNOPSIS
ndisasm [ -o origin ] [ -s sync-point [...]] [ -a | -i ] [ -b bits ] [ -u ] [ -e hdrlen ] [ -k offset,length [...]] infile
ndisasm -h
ndisasm -r
DESCRIPTION
The ndisasm command generates a disassembly listing of the binary file infile and directs it to stdout.
OPTIONS
-h Causes ndisasm to exit immediately, after giving a summary of its invocation options.
-r Causes ndisasm to exit immediately, after displaying its version number.
-o origin
Specifies the notional load address for the file. This option causes ndisasm to get the addresses it lists down the left hand mar-
gin, and the target addresses of PC-relative jumps and calls, right.
-s sync-point
Manually specifies a synchronisation address, such that ndisasm will not output any machine instruction which encompasses bytes on
both sides of the address. Hence the instruction which starts at that address will be correctly disassembled.
-e hdrlen
Specifies a number of bytes to discard from the beginning of the file before starting disassembly. This does not count towards the
calculation of the disassembly offset: the first disassembled instruction will be shown starting at the given load address.
-k offset,length
Specifies that length bytes, starting from disassembly offset offset, should be skipped over without generating any output. The
skipped bytes still count towards the calculation of the disassembly offset.
-a or -i
Enables automatic (or intelligent) sync mode, in which ndisasm will attempt to guess where synchronisation should be performed, by
means of examining the target addresses of the relative jumps and calls it disassembles.
-b bits
Specifies 16-, 32- or 64-bit mode. The default is 16-bit mode.
-u Specifies 32-bit mode, more compactly than using `-b 32'.
-p vendor
Prefers instructions as defined by vendor in case of a conflict. Known vendor names include intel, amd, cyrix, and idt. The
default is intel.
RESTRICTIONS
ndisasm only disassembles binary files: it has no understanding of the header information present in object or executable files. If you
want to disassemble an object file, you should probably be using objdump(1).
Auto-sync mode won't necessarily cure all your synchronisation problems: a sync marker can only be placed automatically if a jump or call
instruction is found to refer to it before ndisasm actually disassembles that part of the code. Also, if spurious jumps or calls result
from disassembling non-machine-code data, sync markers may get placed in strange places. Feel free to turn auto-sync off and go back to
doing it manually if necessary.
SEE ALSO
objdump(1).
The Netwide Assembler Project NDISASM(1)