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fix Makefile and README.md for 2012/zeitak

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Rename the obfuscated source.
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Landon Curt Noll committed 2023-03-23 23:29:16 -07:00
1 parent 46da66b3f7
commit 84fad51c65
3 files changed
+93 -90
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2012/zeitak/Makefile
+4 -4
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@@ -168,11 +168,11 @@ ENTRY= zeitak
PROG= ${ENTRY} PROG= ${ENTRY}
# #
OBJ= ${PROG}.o OBJ= ${PROG}.o
DATA= DATA= incorrect.c
TARGET= ${PROG} TARGET= ${PROG}
# #
ALT_OBJ= ${PROG}_deobfucate.o ALT_OBJ= ${PROG}.alt.o
ALT_TARGET= ${PROG}_deobfucate ALT_TARGET= ${PROG}.alt
################# #################
@@ -189,7 +189,7 @@ all: data ${TARGET}
${PROG}: ${PROG}.c ${PROG}: ${PROG}.c
${CC} ${CFLAGS} $< -o $@ ${LIBS} ${CC} ${CFLAGS} $< -o $@ ${LIBS}
${PROG}_deobfucate: ${PROG}_deobfucate.c ${PROG}.alt: ${PROG}.alt.c
${CC} ${CFLAGS} $< -o $@ ${LIBS} ${CC} ${CFLAGS} $< -o $@ ${LIBS}
# alternative executable # alternative executable
2012/zeitak/README.md
+89 -86
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@@ -1,40 +1,44 @@
# Balanced use of obfuscation - Gold award # Balanced use of obfuscation - Gold award
Adar Zeitak Adar Zeitak
<aa4z2@walla.co.il> <aa4z2@walla.co.il>
## To build: # To build:
make all ```sh
make
### To run ```
make zeitak
### To run: ### To run:
./zeitak < file.c ```sh
./zeitak < file.c
```
where file.c is the file to be checked for nesting errors. For example, you may where file.c is the file to be checked for nesting errors. For example, you may
try incorrect.c and the program itself. try incorrect.c and the program itself.
### Try: ### Try:
./zeitak < zeitak.c ```sh
./zeitak < incorrect.c ./zeitak < zeitak.c
./zeitak < incorrect.c
```
### Alternate code ### Alternate code
An alternate version of this entry, `zeitak\_deobfucate.c`, is provided. An alternate version of this entry, `zeitak.alt.c`, is provided.
The file `zeitak\_deobfucate.c` provides a version that has been slightly The file `zeitak.alt.c` provides a version that has been slightly
deobfuscated. You may find reading that file helpful in your attempt deobfuscated. You may find reading that file helpful in your attempt
to understand this extremely subtle entry. to understand this extremely subtle entry.
To compile this alternate version: To compile this alternate version:
make alt ```sh
make alt
```
Use `zeitak\_deobfucate.c` as you would `zeitak` above. Use `zeitak.alt` as you would `zeitak` above.
## Judges' comments ## Judges' comments
@@ -47,80 +51,79 @@ just to understand 18 key characters of this code.
## Author's comments ## Author's comments
### Nesting Errors Detector ### Nesting Errors Detector
#### What does it do #### What does it do
As you have probably understood by looking at the source\*, this program has As you have probably understood by looking at the source\*, this program has
something to do with parenthesis (and equality of opening and closing something to do with parenthesis (and equality of opening and closing
parenthesis, if you look close enough). It goes over the file given to it and parenthesis, if you look close enough). It goes over the file given to it and
checks that every opening (, [, or { has a matching closing one and checks that every opening (, [, or { has a matching closing one and
vice versa. It also checks that every " or ' is closed. vice versa. It also checks that every " or ' is closed.
If an error is detected, an error message will be printed. If the problem If an error is detected, an error message will be printed. If the problem
is a superfluous closing bracket, it will even print a few characters is a superfluous closing bracket, it will even print a few characters
around it's position. around it's position.
* Make sure you view the source with 4 spaces tab width. * Make sure you view the source with 4 spaces tab width.
#### Features #### Features
* Ignores parenthesis inside strings or character constants, so no errors * Ignores parenthesis inside strings or character constants, so no errors
will be detected in the following line: will be detected in the following line:
printf(")"); printf(")");
* Doesn't get confused by the 1984/anonymous entry! * Doesn't get confused by the 1984/anonymous entry!
#### Mis-Features #### Mis-Features
* Escapes (e.g. `\"`) are ignored, so the following line will produce * Escapes (e.g. `\"`) are ignored, so the following line will produce
an error: an error:
printf("\""); printf("\"");
#### Obfuscation #### Obfuscation
IOCCC winners already contain entries without digits, control-flow IOCCC winners already contain entries without digits, control-flow
keywords and certain operators in their source. This entry has an keywords and certain operators in their source. This entry has an
even more limited source, that is: even more limited source, that is:
* Without any digits. * Without any digits.
* Without any character constants. * Without any character constants.
* Without using functions from headers other than stdio. * Without using functions from headers other than stdio.
* Without any control-flow keywords (not even the ?: operator). * Without any control-flow keywords (not even the ?: operator).
* Without any arithmetic or logic operators! * Without any arithmetic or logic operators!
So, what's left? Parenthesis, and lots of them, as looking at the source will So, what's left? Parenthesis, and lots of them, as looking at the source will
reveal immediately. The main obfuscation is building the whole algorithm using reveal immediately. The main obfuscation is building the whole algorithm using
only function calls, typecasts, array lookups and pointer operators. only function calls, typecasts, array lookups and pointer operators.
Additional obfuscations include: Additional obfuscations include:
* Extensive reuse of identifiers: Macros share names with variables, inner * Extensive reuse of identifiers: Macros share names with variables, inner
curly braces scopes contain variables with names identical to those in the curly braces scopes contain variables with names identical to those in the
outer scopes and some of the variables have different uses in different outer scopes and some of the variables have different uses in different
parts of the program. Even the large array has more than one use. parts of the program. Even the large array has more than one use.
* A complicated data structure with "unused" fields. * A complicated data structure with "unused" fields.
* Mostly one-letter identifiers. * Mostly one-letter identifiers.
* Complex recursion: A function might call itself once, twice, or not at all. * Complex recursion: A function might call itself once, twice, or not at all.
#### Compilation/Running Notes #### Compilation/Running Notes
* The program requires `char` to be one byte and pointers to be * The program requires `char` to be one byte and pointers to be
at least two bytes long. at least two bytes long.
* The program was tested on the following platforms: * The program was tested on the following platforms:
** Ubuntu 9.04 32-bit with GCC ** Ubuntu 9.04 32-bit with GCC
** Windows 7 32-bit with GCC ** Windows 7 32-bit with GCC
** Windows 7 32-bit with OpenWatcom ** Windows 7 32-bit with OpenWatcom
## Copyright:
--------------------------------------------------------------------------------
<!--
(c) Copyright 1984-2015, [Leo Broukhis, Simon Cooper, Landon Curt Noll][judges] - All rights reserved (c) Copyright 1984-2015, [Leo Broukhis, Simon Cooper, Landon Curt Noll][judges] - All rights reserved
This work is licensed under a [Creative Commons Attribution-ShareAlike 3.0 Unported License][cc]. This work is licensed under a [Creative Commons Attribution-ShareAlike 3.0 Unported License][cc].
[judges]: http://www.ioccc.org/judges.html [judges]: http://www.ioccc.org/judges.html
[cc]: http://creativecommons.org/licenses/by-sa/3.0/ [cc]: http://creativecommons.org/licenses/by-sa/3.0/
-->
2012/zeitak/zeitak_deobfucate.c → 2012/zeitak/zeitak.alt.c
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