S-Extract, Self Extractor w/ Source Code

This is a discussion on S-Extract, Self Extractor w/ Source Code within the C++ Programming forums, part of the General Programming Boards category; I wrote a little self extractor a while back, and thought that I would publish the source code. Its just ...

  1. #1
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    S-Extract, Self Extractor w/ Source Code

    I wrote a little self extractor a while back, and thought that I would publish the source code.
    Its just one file, cross platform (just uses iostream, ifstream), and you can use it for whatever you want.

    After you compile it, stick a copy in the directory of files you want to archive, then do:
    "sextract.exe MyTarget.exe MyFirstFile MySecondFile MyThirdFile"

    Then, it will create an executable called MyTarget.exe.
    When you run this executable, the files MyFirstFile, mySecondFile, etc. will be extracted.
    This is a decent very minor overhead system for simple installers and the like.

    I thought I'd post it here, as it is a decent example of binary I/O, how to do it, and can be useful for some people.

    The source code is attached for your enjoyment.
    It compiles and runs under Windows and Linux, probably DOS too, but I haven't tested it under DOS.
    Attached Files Attached Files
    Programming Your Mom. http://www.dandongs.com/

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    Why... when we already have NSIS?

    For one thing, I have [CENSORED] of an idea how it works, thanks to the excellent lack of comments. (One comment line for 77 code lines, folks.)

    For another thing, there is no license, and I might be doing something illegal by looking at it right now. Woe to my scruples!

    The else{} clause will also never execute... since argc will be at least 1 on any commonly-used platform.
    Code:
    #include <stdio.h>
    
    void J(char*a){int f,i=0,c='1';for(;a[i]!='0';++i)if(i==81){
    puts(a);return;}for(;c<='9';++c){for(f=0;f<9;++f)if(a[i-i%27+i%9
    /3*3+f/3*9+f%3]==c||a[i%9+f*9]==c||a[i-i%9+f]==c)goto e;a[i]=c;J(a);a[i]
    ='0';e:;}}int main(int c,char**v){int t=0;if(c>1){for(;v[1][
    t];++t);if(t==81){J(v[1]);return 0;}}puts("sudoku [0-9]{81}");return 1;}

  3. #3
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    Hmm, looks pretty neat. The only problem I can see is that a user could in theory take the archived form, and by doing a pack operation, make their own archive with the original archive inside it, and so on and so forth.
    You ever try a pink golf ball, Wally? Why, the wind shear on a pink ball alone can take the head clean off a 90 pound midget at 300 yards.

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    Sorry about the lack of comments. I didn't think these 77 lines were that confusing. Some time I'll comment it. Also, good catch on the else clause. I must've had that there originally and not intended to have the extractor and the archiver as one program, and let it remain somehow. Not exactly going to cause a problem, but good point.

    Use it however you want. I don't feel like going through the time of choosing a license, and I don't care how you use it.
    Programming Your Mom. http://www.dandongs.com/

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