fix Makefile and README.md for 2004/sds
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@@ -1,362 +1,326 @@
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#!/bin/make
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#!/usr/bin/env make
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#
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# 2004 makefile
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# IOCCC 2004 winning entry - sds
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################################################################################
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#
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# Copyright (C) 2004, Landon Curt Noll, Simon Cooper, Peter Seebach
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# and Leonid A. Broukhis. All Rights Reserved. Permission for personal,
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# educational or non-profit use is granted provided this copyright and
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# notice are included in its entirety and remains unaltered. All other
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# uses must receive prior permission from the contest judges.
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# Regarding individual entries:
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#
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# IOCCC winning entry code may not work on your system. Even with standards,
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# conditions and build environments change, especially when it comes to more
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# extreme code such you might find in an IOCCC winner. Moreover, what was
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# allowed and liked in one IOCCC contest may no longer be liked/allowed in
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# later IOCCC years.
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#
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# Corrections on winning author and fixing typos in remarks are VERY WELCOME.
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#
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# GitHub pull requests are welcome:
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#
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# If you have a patch that might make running an entry work in modern Unix-like
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# environments, please create a GitHub pull request for the IOCCC judges to
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# consider.
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#
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# Suggestions and corrections regarding Makefiles, winning author information,
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# fixing typos in remarks, and code patches are welcome via opening a GitHub
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# issue or better yet, by creating a GitHub pull request for the IOCCC judges
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# to consider. To form a GitHub issue or GitHub pull, please visit:
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#
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# https://github.com/ioccc-src/winner
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#
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################################################################################
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# This work by Landon Curt Noll and Leonid A. Broukhis is licensed under:
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#
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# Creative Commons Attribution-ShareAlike 3.0 Unported License.
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#
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# See: http://creativecommons.org/licenses/by-sa/3.0/
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# tool locations
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#############################
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# shell used by this Makefile
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#############################
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#
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SHELL= /bin/sh
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CP= cp
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CPP= cpp
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GUNZIP= gunzip
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LD= ld
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MAKE= make
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RM= rm
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SED= sed
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TAR= tar
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TRUE= true
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SHELL= bash
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# Special flags for the gavin entry
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#######################
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# common tool locations
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#######################
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#
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# FYI: Older versions of GCC have a bug in -O2 optimization, hence -O1
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#
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GAVIN_OPT= -O1
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GAVIN_FLAGS=\
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'-DY(m)=*((int*)(m))'\
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'-DE(f,a,b,c)=((G((*)))(f))(a,b,c)'\
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'-DM=for(D=0;D<786432;D++)'\
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'-DZ=int i=0,j=0,h,n,p=393728,s=26739,C,D'\
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'-DV=0x90200'\
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'-DK=0'\
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'-DR=while((C=E(V-8,100,0,0))&3&&(D=E(V-8,96,0,0))|3){'\
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'-DL(c,d)=E(V+8,100,c,0);R}E(V+8,96,d,0);R}'
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include ../../var.mk
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# Set X11_LIBDIR to the directory where the X11 library resides
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#
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X11_LIBDIR= /usr/X11R6/lib
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#X11_LIBDIR= /usr/X11R6/lib
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#X11_LIBDIR= /usr/X11/lib
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X11_LIBDIR= /opt/X11/lib
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#CINCLUDE= -I ${HOMEBREW_PREFIX}/include/SDL2
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# Set X11_INCLUDEDIR to the directory where the X11 include files reside
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#
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#X11_INCDIR= /usr/X11R6/include
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#X11_INCDIR= /usr/X11/include
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X11_INCDIR= /opt/X11/include
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# optimization
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# Common C compiler warnings to silence
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#
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#CSILENCE=
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CSILENCE= -Wno-unsequenced -Wno-unused-value
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# Common C compiler warning flags
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#
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#CWARN= ${CSILENCE}
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#CWARN= -Wall ${CSILENCE}
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#CWARN= -Wall -Wextra ${CSILENCE}
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CWARN= -Wall -Wextra -pedantic ${CSILENCE}
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# Compiler standard
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#
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#CSTD=
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#CSTD= -ansi
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CSTD= -std=gnu99
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# Compiler bit architecture
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#
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# Some entries require 32-bitness:
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# ARCH= -m32
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#
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# Some entries require 64-bitness:
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# ARCH= -m64
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#
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# By default we assume nothing:
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#
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ARCH=
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# Defines that are needed to compile
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#
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CDEFINE=
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#CDEFINE= -DIOCCC
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# Include files that are needed to compile
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#
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CINCLUDE=
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#CINCLUDE= -include stdlib.h
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#CINCLUDE= -include stdio.h
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#CINCLUDE= -include stdlib.h -include stdio.h
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#CINCLUDE= -I ${X11_INCDIR} -I ${X11_INCDIR}/X11
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#CINCLUDE= `${SDL2_CONFIG} --cflags`
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# Optimization
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#
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# Most compiles will safely use -O2. Some can use only -O1 or -O.
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# A few compilers have broken optimizers and thus you may
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# not want anything.
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# A few compilers have broken optimizers or this entry make break
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# under those buggy optimizers and thus you may not want anything.
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# Reasonable compilers will allow for -O3.
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#
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#OPT=
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#OPT= -O
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#OPT= -O1
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OPT= -O2
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#OPT= -O2
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OPT= -O3
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# Default flags for ANSI C compilation
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#
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CFLAGS= ${CSTD} ${CWARN} ${ARCH} ${CDEFINE} ${CINCLUDE} ${OPT}
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# flags for ANSI compiles
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# Libraries needed to build
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#
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# NOTE: Some ANSI compilers make use of -Xa to turn on ANSI mode,
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# others such as gcc may want -ansi, others (Compaq Tru64 Unix)
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# want -std1, and others may want nothing at all.
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# Adjust the CFLAGS line as needed.
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#
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# NOTE: Some compilers cannot optimize, or optimize some entries
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# incorrectly. You might want to turn on -O to see if your
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# compiler can handle them.
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#
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#
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#CFLAGS= -Xa ${OPT}
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#CFLAGS= -std1 $(OPT)
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CFLAGS= -ansi ${OPT}
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LIBS=
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#LIBS= -lm
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#LIBS= -L ${X11_LIBDIR} -lX11
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#LIBS= `${SDL2_CONFIG} --libs`
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# ANSI compiler
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#
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# Set CC to the name of your ANSI compiler.
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#
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# Some entries seem to need gcc. If you have gcc, set
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# both CC and MAY_NEED_GCC to gcc.
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#
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# If you do not have gcc, set CC to the name of your ANSI compiler, and
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# set MAY_NEED_GCC to either ${CC} (and hope for the best) or to just :
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# to disable such programs.
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# C compiler to use
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#
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CC= cc
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MAY_NEED_GCC= gcc
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#CC=clang
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#CC=gcc
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# 2004 winners
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# Compiler add-ons or replacements for clang only
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#
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WINNERS= anonymous arachnid burley gavare gavin hibachi hoyle jdalbec \
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kopczynski newbern omoikane schnitzi sds vik1 vik2
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CLEAN= anonymous_clean arachnid_clean burley_clean gavare_clean gavin_clean \
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hibachi_clean hoyle_clean jdalbec_clean kopczynski_clean \
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newbern_clean omoikane_clean schnitzi_clean sds_clean vik1_clean \
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vik2_clean
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CLOBBER= anonymous_clobber arachnid_clobber burley_clobber gavare_clobber \
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gavin_clobber hibachi_clobber hoyle_clobber jdalbec_clobber \
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kopczynski_clobber newbern_clobber omoikane_clobber schnitzi_clobber \
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sds_clobber vik1_clobber vik2_clobber
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ALT_NAMES= hoyle.orig kopczynski.orig
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DATA_FILES= arachnid_files gavin_files hibachi_files kopczynski_files \
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newbern_files omoikane_files schnitzi_files
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# default build
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ifeq ($(CC),clang)
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#
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all: ${WINNERS}
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# Best use of "Precious" Lines
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CSILENCE+= -Wno-missing-prototypes -Wno-missing-variable-declarations \
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-Wno-poison-system-directories
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#
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anonymous: anonymous.c
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${CC} anonymous.c -o anonymous
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anonymous_clean:
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${RM} -f anonymous.o
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anonymous_clobber: anonymous_clean
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${RM} -f anonymous
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# Best use of Vision
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CWARN+= -Weverything
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#
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arachnid: arachnid.c
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${CC} -o arachnid -DL=LINES -DS=COLS \
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-DW=mvwaddch\(w,v,u,acs_map\[l\[m\[u arachnid.c -lncurses
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endif
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arachnid_clean:
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${RM} -f arachnid.o
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arachnid_clobber: arachnid_clean
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${RM} -f arachnid
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arachnid_files: arachnid.info
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# Best Calculated Risk
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# Specific add-ons or replacements for gcc only
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#
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burley: burley.c
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${CC} -ansi burley.c -o burley
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burley_clean:
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${RM} -f burley.o
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burley_clobber: burley_clean
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${RM} -f burley
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# Best Use of Light and Spheres
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ifeq ($(CC),gcc)
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#
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gavare: gavare.c
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${CC} -O3 gavare.c -o gavare
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gavare_clean:
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${RM} -f gavare.o
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gavare_clobber: gavare_clean
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${RM} -f gavare
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# Best of Show
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#CSILENCE+=
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#
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gavin: gavin.c
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${CC} ${GAVIN_OPT} -o gavin ${GAVIN_FLAGS} gavin.c
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${RM} -f kernel
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./gavin > kernel
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${CC} ${GAVIN_OPT} -c ${GAVIN_FLAGS} -DB=_start '-Dputchar(a)=' gavin.c
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${RM} -f sh
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${LD} -s -o sh gavin.o
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${RM} -f vi
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${CP} sh vi
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${RM} -f fs.tar
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${TAR} -cvf fs.tar sh vi gavin.c gavin.hint prim
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gavin_clean:
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${RM} -f sh vi kernel gavin.o
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gavin_clobber: gavin_clean
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${RM} -f gavin fs.tar
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gavin_files: boot.b lilo.conf prim gavin_install.txt
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# Best Abuse of the Guidelines
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#CWARN+=
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#
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hibachi: hibachi.tar.gz
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${RM} -f hibachi.tar
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${GUNZIP} < hibachi.tar.gz > hibachi.tar
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${TAR} -xvf hibachi.tar
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${RM} -f hibachi.tar
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(cd hibachi && ${SHELL} ./configure)
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([ -f hibachi/makefile ] && cd hibachi && $(MAKE) -f makefile || true)
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hibachi_clean:
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${RM} -f hibachi/hibachi.o hibachi.tar
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hibachi_clobber: hibachi_clean
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${RM} -rf hibachi
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hibachi_files: hibachi.tar.gz
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endif
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# Most Functional Output
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##############################
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# Special flags for this entry
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##############################
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#
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hoyle: hoyle.c
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${CC} hoyle.c -o hoyle -lm
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hoyle.orig: hoyle.orig.c
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${CC} hoyle.orig.c -o hoyle.orig -lm
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hoyle_clean:
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${RM} -f hoyle.o hoyle.orig.o
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hoyle_clobber: hoyle_clean
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${RM} -f hoyle hoyle.orig
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# Best Abuse of the Periodic Table
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ENTRY= sds
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PROG= ${ENTRY}
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#
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jdalbec: jdalbec.c
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@${RM} -f jdalbec2.c
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-${CC} -E jdalbec.c > jdalbec2.c
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@${RM} -f jdalbec3.c
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${SED} -e 's/ (/(/g' < jdalbec2.c > jdalbec3.c
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${CC} -ansi jdalbec3.c -o jdalbec
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jdalbec_clean:
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${RM} -f jdalbec2.c jdalbec3.c jdalbec.o
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jdalbec_clobber: jdalbec_clean
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${RM} -f jdalbec
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||||
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# Best one-liner
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OBJ= ${PROG}.o
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DATA=
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TARGET= ${PROG}
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#
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kopczynski: kopczynski.c
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||||
${CC} -Dif=while kopczynski.c -o kopczynski
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||||
kopczynski.orig: kopczynski.orig.c
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${CC} -Dif=while kopczynski.orig.c -o kopczynski.orig
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kopczynski_clean:
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${RM} -f kopczynski.o kopczynski.orig.o
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|
||||
kopczynski_clobber: kopczynski_clean
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||||
${RM} -f kopczynski kopczynski.orig
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kopczynski_files: kopczynski-10 kopczynski-11 kopczynski-8a kopczynski-8b \
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kopczynski-8c kopczynski-9
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ALT_OBJ=
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||||
ALT_TARGET=
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||||
|
||||
|
||||
# Best Font Engine
|
||||
#################
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||||
# build the entry
|
||||
#################
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||||
#
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||||
newbern: newbern.c
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||||
${CC} newbern.c -o newbern
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||||
all: data ${TARGET}
|
||||
@${TRUE}
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||||
|
||||
newbern_clean:
|
||||
${RM} -f newbern.o
|
||||
.PHONY: all alt data everything clean clobber install \
|
||||
love haste waste maker easter_egg sandwich \
|
||||
supernova deep_magic magic charon pluto
|
||||
|
||||
newbern_clobber: newbern_clean
|
||||
${RM} -f newbern
|
||||
${PROG}: ${PROG}.c
|
||||
${CC} ${CFLAGS} $< -o $@ ${LIBS}
|
||||
|
||||
newbern_files: newbern.dat
|
||||
|
||||
|
||||
# Best Utility
|
||||
# alternative executable
|
||||
#
|
||||
omoikane: omoikane.c
|
||||
${CC} -O omoikane.c -o omoikane
|
||||
alt: data ${ALT_TARGET}
|
||||
@${TRUE}
|
||||
|
||||
omoikane_clean:
|
||||
${RM} -f omoikane.o
|
||||
|
||||
omoikane_clobber: omoikane_clean
|
||||
${RM} -f omoikane
|
||||
|
||||
omoikane_files: omoikane.info
|
||||
|
||||
|
||||
# Best Non-Use of Curses
|
||||
# data files
|
||||
#
|
||||
schnitzi: schnitzi.c
|
||||
${CC} schnitzi.c -o schnitzi
|
||||
data: ${DATA}
|
||||
@${TRUE}
|
||||
|
||||
schnitzi_clean:
|
||||
${RM} -f schnitzi.o
|
||||
|
||||
schnitzi_clobber: schnitzi_clean
|
||||
${RM} -f schnitzi
|
||||
|
||||
schnitzi_files: schnitzi.inp0 schnitzi.inp1
|
||||
|
||||
|
||||
# Best Abuse of Indentation
|
||||
# both all and alt
|
||||
#
|
||||
sds: sds.c
|
||||
${CC} -o sds sds.c
|
||||
|
||||
sds_clean:
|
||||
${RM} -f sds_encoder.c sds_encoder.o sds.o
|
||||
|
||||
sds_clobber: sds_clean
|
||||
${RM} -f sds sds_encoder
|
||||
|
||||
|
||||
# Best X11 Game
|
||||
#
|
||||
vik1: vik1.c
|
||||
${CC} -ansi -O2 -o vik1 vik1.c -L${X11_LIBDIR} -lX11
|
||||
|
||||
vik1_clean:
|
||||
${RM} -f vik1.o
|
||||
|
||||
vik1_clobber: vik1_clean
|
||||
${RM} -f vik1
|
||||
|
||||
|
||||
# Best Abuse of CPP
|
||||
#
|
||||
vik2: vik2.c
|
||||
@${RM} -f vik2_1.c
|
||||
${CC} -E '-DSTOP=_5' '-DFNAME="vik2_1.c"' vik2.c > vik2_1.c
|
||||
@${RM} -f vik2_2.c
|
||||
${CC} -E vik2_1.c > vik2_2.c
|
||||
${CC} -O vik2_2.c -o vik2
|
||||
|
||||
vik2_clean:
|
||||
${RM} -f vik2_1.c vik2_2.c vik2.o
|
||||
|
||||
vik2_clobber: vik2_clean
|
||||
${RM} -f vik2
|
||||
everything: all alt
|
||||
|
||||
|
||||
###############
|
||||
# utility rules
|
||||
###############
|
||||
#
|
||||
everything: ${WINNERS} ${ALT_NAMES} ${DATA_FILES}
|
||||
clean:
|
||||
${RM} -f ${OBJ} ${ALT_OBJ}
|
||||
@-if [ -f indent.c ]; then \
|
||||
echo ${RM} -f indent.c; \
|
||||
${RM} -f indent.c; \
|
||||
fi
|
||||
|
||||
clobber: clean
|
||||
${RM} -f ${TARGET} ${ALT_TARGET}
|
||||
@-if [ -e sandwich ]; then \
|
||||
${RM} -f sandwich; \
|
||||
echo 'ate sandwich'; \
|
||||
fi
|
||||
|
||||
install:
|
||||
@echo "Dr. Spock says that is not logical!"
|
||||
@${TRUE}
|
||||
|
||||
# you may be able to misunderstand the source by reading indent.c
|
||||
#
|
||||
indent.c: ${PROG}.c
|
||||
@if which "${GINDENT}" >/dev/null 2>&1; then \
|
||||
echo ${RM} -f $@; \
|
||||
${RM} -f $@; \
|
||||
echo "${GINDENT} < $< > $@"; \
|
||||
${GINDENT} < $< > $@; \
|
||||
elif which "${INDENT}" >/dev/null 2>&1; then \
|
||||
echo ${RM} -f $@; \
|
||||
${RM} -f $@; \
|
||||
echo "${INDENT} < $< > $@"; \
|
||||
${INDENT} < $< > $@; \
|
||||
else \
|
||||
echo "no intent tool found, ident $< yourself, sorry"; \
|
||||
echo "exit 1"; \
|
||||
exit 1; \
|
||||
fi
|
||||
|
||||
|
||||
##################
|
||||
# 133t hacker rulz
|
||||
##################
|
||||
#
|
||||
love:
|
||||
@echo 'not war?'
|
||||
@${TRUE}
|
||||
|
||||
haste:
|
||||
$(MAKE) waste
|
||||
|
||||
waste:
|
||||
@echo 'waste'
|
||||
|
||||
clean: ${CLEAN}
|
||||
${RM} -f a.out core
|
||||
|
||||
clobber: ${CLOBBER}
|
||||
${RM} -f ${WINNERS}
|
||||
${RM} -f ${ALT_NAMES}
|
||||
|
||||
nuke: clobber
|
||||
@${TRUE}
|
||||
|
||||
install: all
|
||||
${CAT} ${WINNERS} ${ALT_NAMES} > /dev/null
|
||||
waste:
|
||||
@echo 'haste'
|
||||
@${TRUE}
|
||||
|
||||
maker:
|
||||
@echo 'Participate in a maker faire'
|
||||
@${TRUE}
|
||||
|
||||
easter_egg:
|
||||
@echo "you expected to often misunderstand this $${RANDOM} magic"
|
||||
@echo "chongo '<was here>' /\\oo/\\"
|
||||
@echo "Eggy"
|
||||
|
||||
sandwich: easter_egg
|
||||
@if [ `id -u` -eq 0 ]; then \
|
||||
echo 'Okay.'; \
|
||||
echo "$${RANDOM}`date +%s`$${RANDOM}" > $@; \
|
||||
else \
|
||||
echo 'What? Make it yourself.'; \
|
||||
exit 1; \
|
||||
fi
|
||||
|
||||
# Understand the history of the Homebrew Computer Club
|
||||
# as well as the West Coast Computer Faire and
|
||||
# you might be confused different. :-)
|
||||
#
|
||||
supernova: sandwich
|
||||
@-if [ -r .code_anal ]; then \
|
||||
${RM} -f .code_anal_v6; \
|
||||
else \
|
||||
echo "planet deniers, like some members of the IAU, are so cute when they try to defend their logic"; \
|
||||
fi
|
||||
@echo "A $@ helps ${MAKE} the elements that help form planets"
|
||||
@${TRUE}
|
||||
|
||||
deep_magic: supernova
|
||||
@-if [ -r .code_anal ]; then \
|
||||
ccode_analysis --deep_magic 7889066cdbdf09b0408021754586e895be641cc9be29e7eafd3ca65359541f17 \
|
||||
--FNV1a_hash_512_bit -v2 "${PROG}" "${PROG}.c"; \
|
||||
else \
|
||||
echo "Wrong! Do it again!"; \
|
||||
sleep 2; \
|
||||
echo "Wrong! Do it again!"; \
|
||||
sleep 2; \
|
||||
echo "Wrong! Do it again!"; \
|
||||
fi
|
||||
@${TRUE}
|
||||
|
||||
magic: deep_magic
|
||||
@-if [ -r .code_anal ]; then \
|
||||
ccode_analysis --level 20003 --mode 5717175 --FNV1a_hash_512_bit -v2 "${PROG}" "${PROG}.c"; \
|
||||
else \
|
||||
echo "If you don't eat yer meat, you can't have any pudding!"; \
|
||||
echo "How can you have any pudding if you don't eat yer meat?!"; \
|
||||
fi
|
||||
@${TRUE}
|
||||
|
||||
# The IOCCC resident astronomer states
|
||||
#
|
||||
charon: magic
|
||||
@echo "$@ is a dwarf planet"
|
||||
@echo "dwarf is a type of planet"
|
||||
@echo "therefore IAU, $@ is a planet"
|
||||
|
||||
pluto: charon
|
||||
${MAKE} charon
|
||||
@echo "$@ is a dwarf planet"
|
||||
@echo "dwarf is a type of planet"
|
||||
@echo "therefore, $@ is a planet"
|
||||
@echo "having lots of planets is good feature because supernovae can help ${MAKE} a lot of them"
|
||||
+76
-60
@@ -1,4 +1,4 @@
|
||||
Best Abuse of Indentation:
|
||||
# Best Abuse of Indentation:
|
||||
|
||||
Stephen Sykes
|
||||
Laivalahdenportti 2
|
||||
@@ -7,89 +7,105 @@ Best Abuse of Indentation:
|
||||
|
||||
http://www.stephensykes.com
|
||||
|
||||
# To build:
|
||||
|
||||
Judges' Comments:
|
||||
```sh
|
||||
make
|
||||
```
|
||||
|
||||
To build:
|
||||
### To run:
|
||||
|
||||
make sds
|
||||
```sh
|
||||
./sds
|
||||
```
|
||||
|
||||
Try:
|
||||
### Try:
|
||||
|
||||
./sds < sds.c > encoder.c
|
||||
cc -o encoder encoder.c
|
||||
./encoder sds.hint <sds.c >sds_msg.c
|
||||
```sh
|
||||
./sds < sds.c > encoder.c
|
||||
cc -o encoder encoder.c
|
||||
./encoder sds.hint <sds.c >sds_msg.c
|
||||
```
|
||||
|
||||
Why not use the program to hide another program in the program? It
|
||||
must have seemed reasonable at the time.
|
||||
## Judges' comments:
|
||||
|
||||
The ability to hide a message in plain text is quite charming, really.
|
||||
We must admit to a bit of uncertainty about where you'd find such
|
||||
messages, or how useful they'd be. Or, of course, whether all those
|
||||
horribly badly formatted emails spammers send might contain secret
|
||||
messages. Annoyingly, it's a little too obvious that SOMETHING has
|
||||
been done to a message for us to hide one in the remarks. :)
|
||||
Why not use the program to hide another program in the program? It
|
||||
must have seemed reasonable at the time.
|
||||
|
||||
The ability to hide a message in plain text is quite charming, really.
|
||||
We must admit to a bit of uncertainty about where you'd find such
|
||||
messages, or how useful they'd be. Or, of course, whether all those
|
||||
horribly badly formatted emails spammers send might contain secret
|
||||
messages. Annoyingly, it's a little too obvious that SOMETHING has
|
||||
been done to a message for us to hide one in the remarks. :)
|
||||
|
||||
Selected Author's Comments:
|
||||
## Author's comments:
|
||||
|
||||
Steganography is the term for the family of techniques used for
|
||||
hiding information within other information. Today, it has many real
|
||||
world uses, particularly for digital watermarking.
|
||||
Stenography is the term for the family of techniques used for
|
||||
hiding information within other information. Today, it has many real
|
||||
world uses, particularly for digital watermarking.
|
||||
|
||||
This program uses a steganographic technique to hide information in
|
||||
any text file. The specific technique used is aimed at writers of
|
||||
obfuscated programs for the IOCCC, as the hidden information is
|
||||
encoded in the whitespace in the source file. As we know, there are
|
||||
up to an additional 2048 characters of whitespace available to
|
||||
entrants to the IOCCC, so it turns out that this is an ideal place to
|
||||
hide things.
|
||||
This program uses a stenographic technique to hide information in
|
||||
any text file. The specific technique used is aimed at writers of
|
||||
obfuscated programs for the IOCCC, as the hidden information is
|
||||
encoded in the whitespace in the source file. As we know, there are
|
||||
up to an additional 2048 characters of whitespace available to
|
||||
entrants to the IOCCC, so it turns out that this is an ideal place to
|
||||
hide things.
|
||||
|
||||
The program as provided is the steganographic decoder. Rather than
|
||||
provide a seperate encoding program, you should not be surprised to
|
||||
learn that I opted to steganographically hide the encoder inside the
|
||||
decoder.
|
||||
The program as provided is the stenographic decoder. Rather than
|
||||
provide a separate encoding program, you should not be surprised to
|
||||
learn that I opted to stenographically hide the encoder inside the
|
||||
decoder.
|
||||
|
||||
Try it out. Compile the program, then type
|
||||
Try it out. Compile the program, then type
|
||||
|
||||
sds < sds.c
|
||||
```sh
|
||||
sds < sds.c
|
||||
```
|
||||
|
||||
You should see the encoder program displayed. Now save it, like:
|
||||
You should see the encoder program displayed. Now save it, like:
|
||||
|
||||
sds < sds.c > encoder.c
|
||||
```sh
|
||||
sds < sds.c > encoder.c
|
||||
```
|
||||
|
||||
Then compile encoder.c. You now have the complete system ready.
|
||||
Then compile encoder.c. You now have the complete system ready.
|
||||
|
||||
The encoder expects to get a filename as an argument. This filename
|
||||
is the name of the file containing the information to be hidden. It
|
||||
expects the file in which to hide the information to be on the
|
||||
standard input, and will output the results on the standard output.
|
||||
The encoder expects to get a filename as an argument. This filename
|
||||
is the name of the file containing the information to be hidden. It
|
||||
expects the file in which to hide the information to be on the
|
||||
standard input, and will output the results on the standard output.
|
||||
|
||||
You can use it like this (assuming you have a file called remarks):
|
||||
You can use it like this (assuming you have a file called remarks):
|
||||
|
||||
echo 'Hello, World!' > message
|
||||
encoder message < remarks > remarks_msg
|
||||
```sh
|
||||
echo 'Hello, World!' > message
|
||||
./encoder message < remarks > remarks_msg
|
||||
```
|
||||
|
||||
Then to decode:
|
||||
Then to decode:
|
||||
|
||||
sds < remarks_msg
|
||||
Hello, World!
|
||||
```sh
|
||||
./sds < remarks_msg
|
||||
Hello, World!
|
||||
```
|
||||
|
||||
C programs are mostly unaffected by adding steganographic content,
|
||||
but it is possible in certain circumstances for whitespace to be
|
||||
changed inside strings where it should be left alone. Plain text
|
||||
files are good candidates for hiding information in, but the added
|
||||
spacing may render the text somewhat difficult to read.
|
||||
C programs are mostly unaffected by adding steganographic content,
|
||||
but it is possible in certain circumstances for whitespace to be
|
||||
changed inside strings where it should be left alone. Plain text
|
||||
files are good candidates for hiding information in, but the added
|
||||
spacing may render the text somewhat difficult to read.
|
||||
|
||||
This program is obfuscated in a number of ways:
|
||||
This program is obfuscated in a number of ways:
|
||||
|
||||
* The code is all but impossible to read due to the spacing
|
||||
* The algorithm is well hidden in the code due to copious red-herrings
|
||||
* The long expressions cause indentation tools to give poor results
|
||||
* And good old fashioned ternery operators are the icing on the cake
|
||||
* The code is all but impossible to read due to the spacing
|
||||
* The algorithm is well hidden in the code due to copious red-herrings
|
||||
* The long expressions cause indentation tools to give poor results
|
||||
* And good old fashioned ternery operators are the icing on the cake
|
||||
|
||||
Compiling the program
|
||||
Compiling the program
|
||||
|
||||
The program (and the encoder program) should compile on any
|
||||
reasonable compiler. In particular, they are known to compile under
|
||||
GNU C.
|
||||
The program (and the encoder program) should compile on any
|
||||
reasonable compiler. In particular, they are known to compile under
|
||||
GNU C.
|
||||
Reference in new issue
Block a user