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Convert hexadecimal ascii text listings like 303132 to binary with the free sfk for windows and linux, allowing also prefiltering of the input data.

- download the free swiss file knife base from sourceforge.
- unpack the tool using winzip or unzip.
- open the Windows Command Line or a Linux shell.

sfk ... +hextobin outfile

   convert lines of text containing hexdump to binary.

   chain-only command.

      hextobin can be used only after another command,
      typically filter, which reads and prepares the input data.

   examples:

      sfk filter dump.txt +hextobin out.dat
         requires dump.txt to contain pure hex data, e.g.

            7466696C 65732F46 6F726D61 74732F31

         blanks and some chars like <> are skipped automatically.

      sfk filter dump.txt "-+ >" -rep "_<*__" +hextobin out.dat
         takes a verbose hexdump produced by "sfk hexump":

           >73746669 6C65732F 42617365 4C69622F< stfiles/BaseLib/ 00000020

         using only lines starting with " >" (skipping a possible
         filename line), stripping the ascii and offset infos after "< ",
         extracting and converting pure hex data.

      sfk fromclip +hextobin %TEMP%\tmp1.dat +hexdump
         takes a hex sequence like 22737769 73732066 from clipboard,
         printing it's text via a temporary file and hexdump.
 
example: write a list of bytes into a binary file

   let's say we want to write the binary data

      0x01 0x02 0x03 0x04 0x05

   into a binary file "target.exe" at offset 0x9876,
   then this can be achieved by these steps:

   sfk echo "01 02 03 04 05" +hextobin tmp1.dat

      writes the byte sequence into a temporary file.

   sfk partcopy tmp1.dat 0 5 target.exe 0x9876 -yes

      copies these bytes from tmp1.dat into target.exe,
      which must exist, at the offset 0x9876 (39030 decimal).


      finally, you may

   sfk hexdump target.exe -offlen 0x9870 20

      to check the result by dumping the bytes around that area:
   
       :file target.exe
       >28C80000 10C20102 03040500 00000000< (............... 00009870
       >00000000 06C90000 44C20000 00000000< ........D....... 00009880
   

see also:

   sfk hexdump    - creating hexdumps from binary data.
   sfk partcopy   - copy parts of a binary file.

read more about all sfk functions here.

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