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GNU GENERAL PUBLIC LICENSE
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===============================================================================
EKSD - let's go ahead and XXD again
===============================================================================
xxd is a very good hexdump program that makes editing files on UNIX very easy.
It also doesn't support text-tables. Which sucks.
eksd is a clone of a good hexdump program (even matching several arguments
exactly)… except it supports text-tables.
————————————————————————————————————————
USAGE
————————————————————————————————————————
To see a hexdump of a file, just run:
$ eksd $FILE > $HEXDUMP
If you want to turn a hexdump (from eksd or xxd) back to a file:
$ eksd -r $HEXDUMP > $FILE
And to make a hexdump with a custom text-table:
$ eksd -t $TABLEFILE $FILE > $HEXDUMP
Text-tables are in a simple format— one hexcode per line, followed by it's
character. See text-tables/* for examples.
By default, eksd uses a built-in *fancy* text-table— it's basic ASCII,
except it'll print nice pictographics for newline characters, etc. These
require UTF, of course. If they don't work for you, use the "-a" arg to
revert to simple, non-fancy ASCII.
Note that specifying a text-table will override "-a", though.
————————————————————
EXAMPLES
————————————————————
Here's a part of Castlevania (EU) for the NES using it's text-table:
$ eksd -t castle-table.txt castlevania.nes | grep -A4 "18e80"
00018e80: 5454 5454 866e 6854 6460 8486 5454 5454 ....THE.CAST....
00018e90: 5454 5454 5466 8260 6488 7660 5454 5454 .....DRACULA....
00018ea0: 5464 6e82 7084 867c 7e6e 6882 5462 6868 .CHRISTOPHER.BEE
00018eb0: 5454 5454 5454 6668 6086 6e54 5454 5454 ......DEATH.....
00018ec0: 5454 5462 6876 7c54 7688 6c7c 8470 5454 ...BELO.LUGOSI..
And here's that same file in xxd (just because I feel like showing off):
$ xxd castlevania.nes | grep -A4 "18e80"
00018e80: 5454 5454 866e 6854 6460 8486 5454 5454 TTTT.nhTd`..TTTT
00018e90: 5454 5454 5466 8260 6488 7660 5454 5454 TTTTTf.`d.v`TTTT
00018ea0: 5464 6e82 7084 867c 7e6e 6882 5462 6868 Tdn.p..|~nh.Tbhh
00018eb0: 5454 5454 5454 6668 6086 6e54 5454 5454 TTTTTTfh`.nTTTTT
00018ec0: 5454 5462 6876 7c54 7688 6c7c 8470 5454 TTTbhv|Tv.l|.pTT
————————————————————————————————————————
INSTALLATION
————————————————————————————————————————
Prebuilt binaries can be found at https://mirror.eunichx.us/eksd/
for both Linux and OpenBSD.
… but if they don't work for you, you can make your own binary.
That requires a Lisp (I recommend SBCL) and Quicklisp (https://quicklisp.org).
Put this into "quicklisp/local-projects/", then run, in your lisp interpreter:
# (ql:quickload '(eksd eksd-unix))
# (save-lisp-and-die "eksd" :toplevel #'eksd-unix:invoke :executable t)
And bam, you've made a binary. Cool.
————————————————————————————————————————
BORING STUFF
————————————————————————————————————————
License is the GNU GPLv3:
check COPYING.txt (/ipfs/QmTBpqbvJLZaq3hTMUhxX5hyJaSCeWe6Q5FRctQbsD6EsE)
Author is Jaidyn Ann <jadedctrl@teknik.io>
Sauce is at https://git.eunichx.us/eksd.git

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;; This file is free software: you can redistribute it and/or modify
;; it under the terms of version 3 of the GNU General Public License
;; as published by the Free Software Foundation.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
(defpackage :eksd-unix
(:use :cl :eksd)
(:export :invoke
*text-table*))
(in-package :eksd-unix)
;; —————————————————————————————————————
(opts:define-opts
(:name :help
:description "print this help text."
:short #\h :long "help")
(:name :reverse
:description "reverse operation: convert hexdump into binary."
:short #\r :long "reverse")
(:name :upcase
:description "print hexadecimal in uppercase."
:short #\u :long "upcase")
(:name :width
:description "octets per line; 16 as default."
:short #\c :long "cols"
:arg-parser #'parse-integer
:meta-var "COLS")
(:name :seek
:description "skip given amount of bytes in file."
:short #\s :long "seek"
:arg-parser #'parse-integer
:meta-var "OFFSET")
(:name :group
:description "octets per group; 2 as default."
:short #\g :long "groupsize"
:arg-parser #'parse-integer
:meta-var "OCTETS")
(:name :ascii
:description "use simple-ascii for previews; default is fun."
:short #\a :long "ascii")
(:name :text-table
:description "specify a text-table; semi-ascii as default."
:short #\t :long "table"
:arg-parser #'probe-file
:meta-var "TABLE"))
;; —————————————————————————————————————
;; MACROS
;; LIST SYMBOL FORM
(defmacro when-opt (opts option body)
`(when (getf ,opts ,option)
,body))
;; LIST SYMBOL FORM FORM
(defmacro if-opt (opts option if-form &optional else-form)
`(if (getf ,opts ,option)
,if-form ,else-form))
;; —————————————————————————————————————
;; MAIN - INVOCATION
;; NIL → NIL
(defun invoke ()
"Actual invocation of the program. This is what you should set as :toplevel."
(multiple-value-bind (opts free) (opts:get-opts)
(when-opt opts :help (help))
(choose-text-table opts)
(let* ((input-stream (choose-input-stream free opts)))
(when (not input-stream)
(format *error-output* "eksd: No file provided and nothing piped.~%")
(help 2))
(choose-stream-position opts input-stream)
(reverse-or-dump opts input-stream)
(close input-stream))))
;; NUMBER STREAM → NIL
(defun help (&optional (exit-code 0) (stream *standard-output*))
"Prints help message and dies."
(unix-opts:describe :prefix "usage: eksd [-hr] [-t table-file] file"
:stream stream)
(unix-opts:exit exit-code))
;; —————————————————
;; LIST STREAM → NIL
(defun reverse-or-dump (opts input-stream)
"Determine if a hexdump or reversal's necessary— and execute it."
(if-opt opts :reverse
(reverse-stream input-stream)
(apply #'print-stream (choose-pstream-args opts input-stream))))
;; —————————————————————————————————————
;; INPUT
;; LIST → STREAM
(defun choose-input-stream (free-args opts)
"Select an input stream, between a file passed in free-args or stdin."
(let* ((input-file (car free-args))
(input-file-p (ignore-errors (probe-file input-file)))
(stdin-p (listen *standard-input*)))
(cond ((and (getf opts :reverse) input-file-p)
(open input-file :direction :input :element-type 'character))
(input-file-p (open-byte input-file))
(stdin-p *standard-input*))))
;; LIST → NIL
(defun choose-text-table (opts)
"Choose the appropriate text-table— user-given or otherwise."
(if-opt opts :text-table
(setq *text-table* (parse-table-file (getf opts :text-table)))
(if-opt opts :ascii
(setq *text-table* eksd:*ascii-text-table*)
(setq *text-table* eksd:*fancy-text-table*))))
;; LIST STREAM → NIL
(defun choose-stream-position (opts stream)
"Choose the correct stream position— if seek arg used, etc."
(when (not (eq stream *standard-input*))
(if-opt opts :seek (file-position stream (getf opts :seek)))))
;; LIST STREAM → LIST
(defun choose-pstream-args (opts input-stream)
"Take all options, and return the appropriate arguments to #'print-stream."
(let ((args (list input-stream)))
(when-opt opts :upcase (nconc args '(:upcase t)))
(when-opt opts :width (nconc args `(:width ,(getf opts :width))))
(when-opt opts :group (nconc args `(:group ,(getf opts :group))))
args))
;; —————————————————
;; STREAM NUMBER NUMBER → LIST NUMBER
(defun get-line-hex (stream index width)
"Return a line's worth of octets; and a new octet-index."
(values
(loop :while (listen stream) :for i :from 1 :to width
:collect (eksd:read-hex stream) :do (incf index))
index))
;; —————————————————————————————————————
;; OUTPUT
;; STREAM NUMBER NUMBER STREAM
(defun print-stream (stream &key (width 16) (group 2) (upcase nil) (out 't))
"Print an entire stream in hex, xxd-style."
(let ((index 0))
(loop :while (listen stream)
:do (setq index (print-line stream :out out :index index
:group group :width width
:upcase upcase)))))
;; STREAM STREAM NUMBER NUMBER NUMBER → NUMBER
(defun print-line (stream &key (out 't) (index 0) (width 16) (group 2)
(upcase nil))
"Print a given line of xxd-style output— index, bytes, preview and all.
Returns the new index of the stream."
(multiple-value-bind (hexes new-index) (get-line-hex stream index width)
(print-index index out)
(print-bytes (list-pad hexes width " ") group upcase out)
(print-preview hexes out)
(format t "~%")
new-index))
;; NUMBER STREAM → NIL
(defun print-index (index &optional (out 't))
"Print the current index, padded to 8 char-length and in hexadecimal."
(format out "~8,,,'0@A: " (string-downcase (eksd:integer-to-hex index))))
;; LIST_OF_STRINGS NUMBER STREAM → NIL
(defun print-bytes (hexes group-size upcase &optional (out 't))
"Print the given list of bytes on a line in specified-sized groupings."
(mapcar (lambda (group)
(format out (if upcase "~{~@:(~a~)~} " "~{~(~a~)~} ") group))
(pairs hexes group-size)))
;; LIST_OF_STRINGS STREAM → NIL
(defun print-preview (hexes &optional (out 't))
"Print a given list of bytes' preview, as per ASCII table."
(format out " ~{~A~}"
(mapcar (lambda (hex) (hex-to-char hex *text-table*)) hexes)))
;; —————————————————————————————————————
;; REVERSAL
;; STREAM STREAM → NIL
(defun reverse-stream (stream &optional (out *standard-output*))
"Take a stream of xxd-style/eksd-output hexcode and convert back into binary."
(loop :while (listen stream)
:do (mapcar (lambda (byte)
(write-byte (eksd:hex-to-integer byte) out))
(line-to-hexes (read-line stream)))))
;; STRING → LIST
(defun line-to-hexes (line)
"Convert an xxd-style/eksd-output hexcode line into a list of hexcodes."
(mapcar (lambda (pair) (format nil "~{~A~}" pair))
(string-pairs
(remove #\space (car (cl-strings:split
(left-clip-string line ": ")" "))))))
;; —————————————————————————————————————
;; TEXT-TABLES
;; STRING → LIST
(defun parse-table-line (string)
"Parse a text-table line into a pair of hex-code and preview character."
(let ((chars (char-list string)))
(list (format nil "~{~a~}" (list (car chars) (cadr chars)))
(tail chars))))
;; PATHNAME → LIST
(defun parse-table-file (pathname)
"Parse a text-table file (hexcode followed by preview character) into a list
of lists '(hexcode character)."
(with-open-file (istream pathname :direction :input :element-type 'character)
(loop :while (listen istream)
:collect (parse-table-line (read-line istream)))))
;; —————————————————————————————————————
;; MISC
;; LIST NUMBER VARYING → LIST
(defun list-pad (list target-length &optional (padding nil))
"Pad a list out to length, by appending padding as necessary."
(if (not (eq target-length (length list)))
(list-pad (append list (list padding)) target-length padding)
list))
;; LIST NUMBER → LIST
(defun pairs (list width &optional pairs)
"Split a list into pairs (sublist) of a given width."
(cond ((not list) pairs)
((or (eq width (length (tail pairs))) (not pairs))
(pairs (cdr list) width (nconc pairs `((,(car list))))))
((not (eq width (length (tail pairs))))
(pairs (cdr list) width
(nconc (de-tail pairs) `(,(nconc (tail pairs) `(,(car list)))))))))
;; STRING CHARACTER → STRING
(defun left-clip-string (string &optional (seperator #\space))
"Clip a string up to the first instance of the seperator."
(reduce (lambda (a b) (format nil "~A~A~A" a seperator b))
(cdr (cl-strings:split string seperator))))
;; STRING NUMBER → LIST
(defun string-pairs (string &optional (pair-length 2))
"Return a list of characters from a string in pairs of given length."
(pairs (char-list string) pair-length))
;; PATHNAME → STREAM
(defun open-byte (pathname)
"Open an input file as a byte-stream."
(open pathname :direction :input :element-type '(unsigned-byte 8)))
;; —————————————————
(defun char-list (string) (loop :for char :across string :collect char))
(defun de-tail (list) (reverse (cdr (reverse list))))
(defun tail (list) (car (last list)))

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(defsystem "eksd"
:version "0.1"
:license "GPLv3"
:author "Jaidyn Ann <jadedctrl@teknik.io>"
:description "For reading files into hex— `xxd`-like with text-tables."
:depends-on ()
:components ((:file "eksd")))
(defsystem "eksd-unix"
:version "0.1"
:license "GPLv3"
:author "Jaidyn Ann <jadedctrl@teknik.io>"
:description "UNIX terminal front-tend to eksd. `xxd` twin."
:depends-on (:eksd :unix-opts :cl-strings)
:components ((:file "eksd-unix")))

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;; This file is free software: you can redistribute it and/or modify
;; it under the terms of version 3 of the GNU General Public License
;; as published by the Free Software Foundation.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
(defpackage :eksd
(:use :cl)
(:export :stream-to-hex
:file-to-hex
:hex-to-char
:hex-to-file
:hex-to-integer
:integer-to-hex
:hex-to-stream
:read-hex
*ascii-text-table*
*fancy-text-table*))
(in-package :eksd)
;; —————————————————————————————————————
(defparameter *ascii-text-table*
'(("20" #\space)("21" #\!)("22" #\")("23" #\#)("24" #\$) ("25" #\%)
("26" #\&) ("27" #\') ("28" #\() ("29" #\)) ("2A" #\*) ("2B" #\+)
("2C" #\,) ("2D" #\-) ("2E" #\.) ("2F" #\/) ("30" #\0) ("31" #\1)
("32" #\2) ("33" #\3) ("34" #\4) ("35" #\5) ("36" #\6) ("37" #\7)
("38" #\8) ("39" #\9) ("3A" #\:) ("3B" #\;) ("3C" #\<) ("3D" #\=)
("3E" #\>) ("3F" #\?) ("40" #\@) ("41" #\A) ("42" #\B) ("43" #\C)
("44" #\D) ("45" #\E) ("46" #\F) ("47" #\G) ("48" #\H) ("49" #\I)
("4A" #\J) ("4B" #\K) ("4C" #\L) ("4D" #\M) ("4E" #\N) ("4F" #\O)
("50" #\P) ("51" #\Q) ("52" #\R) ("53" #\S) ("54" #\T) ("55" #\U)
("56" #\V) ("57" #\W) ("58" #\X) ("59" #\Y) ("5A" #\Z) ("5B" #\[)
("5C" #\\) ("5D" #\]) ("5E" #\^) ("5F" #\_) ("60" #\`) ("61" #\a)
("62" #\b) ("63" #\c) ("64" #\d) ("65" #\e) ("66" #\f) ("67" #\g)
("68" #\h) ("69" #\i) ("6A" #\j) ("6B" #\k) ("6C" #\l) ("6D" #\m)
("6E" #\n) ("6F" #\o) ("70" #\p) ("71" #\q) ("72" #\r) ("73" #\s)
("74" #\t) ("75" #\u) ("76" #\v) ("77" #\w) ("78" #\x) ("79" #\y)
("7A" #\z) ("7B" #\{) ("7C" #\|) ("7D" #\}) ("7E" #\~)))
(defparameter *fancy-text-bits*
'(("00" #\×) ("07" #\🔔)("08" "⬅️") ("09" #\↣) ("0A" #\↵) ("0B" #\↧)
("0C" #\⇲) ("0D" #\↲) ("0E" #\⇪) ("0F" #\⇫) ("1B" #\↯) ("7F" #\⇐)))
(defparameter *fancy-text-table* (append *ascii-text-table* *fancy-text-bits*))
;; —————————————————————————————————————
;; X → HEX
;; STREAM → LIST_OF_STRINGS
(defun stream-to-hex (stream)
"Return a stream's data as a list of hexadecimal strings."
(loop :while (listen stream)
:collect (read-hex stream)))
;; PATHNAME → LIST_OF_STRINGS
(defun file-to-hex (pathname)
"Return a list of a file's octets represented in hexadecimal strings."
(with-open-file (fstream pathname
:direction :input :element-type '(unsigned-byte 8))
(stream-to-hex fstream)))
;; —————————————————————————————————————
;; HEX → X
;; LIST_OF_STRINGS STREAM → NIL
(defun hex-to-stream (hexes stream)
"Write a list of bytes (in hex-string format) to a stream."
(loop :for hex :in hexes
:do (write-hex hex stream)))
;; LIST_OF_STRINGS PATHNAME → NIL
(defun hex-to-file (hexes pathname)
"Write a list of bytes (in hex-string format) to a file."
(with-open-file (fstream pathname
:direction :output :element-type '(unsigned-byte 8))
(hex-to-stream hexes fstream)))
;; —————————————————————————————————————
;; TEXT-TABLE FUN
(defgeneric hex-to-char (hex/es &optional text-table)
(:documentation "Return a hexadecimal's respective character (as string)
according to the given text-table."))
;; STRING LIST → STRING
(defmethod hex-to-char ((hex string) &optional (text-table *ascii-text-table*))
(or (cadr (assoc hex text-table :test #'equal)) #\.))
;; LIST_OF_STRINGS LIST → LIST_OF_STRINGS
(defmethod hex-to-char ((hexes list) &optional (text-table *ascii-text-table*))
(mapcar (lambda (hex) (hex-to-char hex text-table)) hexes))
;; PATHNAME LIST → LIST_OF_STRINGS
(defun file-to-char (pathname &optional (text-table *ascii-text-table*))
"Print character representation of a file, as per the given character table."
(hex-to-char (file-to-hex pathname) text-table))
;; CHARACTER LIST → STRING
(defun char-hex (char &optional text-table)
"Return a character's hex, given a text-table."
(if (not text-table)
(integer-to-hex (char-code char))
(cadr (assoc char (mapcar #'reverse text-table)))))
(defun string-hex (string &optional text-table)
(loop :for char :across string
:collect (char-hex char text-table)))
;; —————————————————————————————————————
;; MISC
;; STREAM → STRING
(defun read-hex (stream)
"Read a byte from a stream as a hexcode."
(integer-to-hex (read-byte stream)))
;; STREAM → STRING
(defun write-hex (hex stream)
"Read a byte from a stream as a hexcode."
(write-byte (hex-to-integer hex) stream))
;; NUMBER → STRING
(defun integer-to-hex (number)
"Return the base-16 of a number."
(format nil "~2,'0x" number))
;; STRING → NUMBER
(defun hex-to-integer (hex)
"Convert hex to a base-10 integer."
(parse-integer hex :radix 16))

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60 A
62 B
64 C
66 D
68 E
6A F
6C G
6E H
70 I
72 J
74 K
76 L
78 M
7A N
7C O
7E P
82 R
84 S
86 T
88 U
8A V
8C W
8E X
5C Y
5E Z
5A .

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D0 0
D1 1
D2 2
D3 3
D4 4
D5 5
D6 6
D7 7
D8 8
D9 9
E0 A
E1 B
E2 C
E3 D
E4 E
E5 F
E6 G
E7 H
E8 I
E9 J
EA K
EB L
EC M
ED N
EE O
EF P
F1 R
F2 S
F3 T
F4 U
F5 V
F6 W
F7 .
F8 Y
F9 Z

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E5 A
E6 B
E7 C
E8 D
E9 E
EA F
EB .
EC H
ED I
EE J
EF K
F0 L
F1 M
F2 N
F3 O
F4 P
F5 \
F6 R
F7 S
F8 T
F9 U
FA V
FB W
FC Y
FD ,
10 ©
07 1
0B 9
0C 8