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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Substitution-cipher/REXX/substitution-cipher.rexx Normal file
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/*REXX program implements & demonstrates a substitution cipher for the records in a file*/
parse arg fid.1 fid.2 fid.3 fid.4 . /*obtain optional arguments from the CL*/
if fid.1=='' then fid.1= "CIPHER.IN" /*Not specified? Then use the default.*/
if fid.2=='' then fid.2= "CIPHER.OUT" /* " " " " " " */
if fid.3=='' then fid.3= "CIPHER.KEY" /* " " " " " " */
if fid.4=='' then fid.4= "CIPHER.ORI" /* " " " " " " */
say ' input file: ' fid.1 /*display the fileID used for input. */
say ' output file: ' fid.2 /* " " " " " output. */
say ' cipher file: ' fid.3 /* " " " " " cipher-key*/
say 'decrypted file: ' fid.4 /* " " " " " decrypted*/
call closer /*close all files in case they're open.*/
do c=1 while lines(fid.3)\==0 /*read (hopefully 2 records) from key. */
@.c= space( linein(fid.3), 0) /*assign input record to an @. array.*/
end /*c*/
c= c - 1 /*adjust the number of records (for DO)*/
if c==0 then call ser fid.3, 'not found or is empty.'
if c>2 then call ser fid.3, 'has too many records (>2).'
if c<2 then call ser fid.3, 'has too few records (<2).'
if length(@.1)\==length(@.2) then call ser fid.3, 'has unequal length records.'
call encrypt fid.1, fid.2 /*encrypt the input file ───► output.*/
_=@.1; @.1=@.2; @.2=_ /*switch the cipher keys for decryption*/
call encrypt fid.2, fid.4 /*decrypt the output file ───► decrypt.*/
call show 'cipher file ('fid.3")" , fid.3 /*display the cipher─key file. */
call show 'input file ('fid.1")" , fid.1 /* " " input " */
call show 'output file ('fid.2")" , fid.2 /* " " output " */
call show ' decrypted file ('fid.4")" , fid.4 /* " " decrypted " */
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
closer: do f=1 for 4; call lineout fid.f; end /*f*/; say; return
ser: say '***error!*** file ' arg(1)" " arg(2); exit
show: say; say center( arg(1), 79, '═'); "TYPE" arg(2); return
/*──────────────────────────────────────────────────────────────────────────────────────*/
encrypt: parse arg @in,@out /* [↓] effectively deletes @out file by*/
call lineout @out,,1 /*setting pointer to rec#1 for the file*/
do j=0 while lines(@in)\==0 /*read the input file*/
call lineout @out, translate( linein(@in), @.2, @.1)
end /*j*/
if j==0 then call ser @in, 'is empty.' /*was the file not found or was empty? */
say @in ' records processed: ' j /*show the number of records processed.*/
call closer /*close all the files to be neat & safe*/
return