(im)possible compression method

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Original post by superpig
Too late.

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Original post by superpig
Too late.

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Original post by Fade2Black
trick the computer into thinking that the file didn''t exsist but have maybe a single byte for reference purposes, obviously if the file didn''t exist you couldn''t unpack it. basically index the file into the smallest form of maybe a few digits of a code that would generate the file when decompressed.

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Original post by superpig
Damn, that wasn''t even the right thread, either. Does anyone have a link to the thread where some guy claimed he''d come up with a compression technique where you moved all the 1s to the beginning of the file, all the 0s to the end, and then zipped it?

Or was it that thread? I dunno. I don''t have time to read 27 pages.

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Original post by superpig
Too late.

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Original post by Rixter

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Original post by Fade2Black
trick the computer into thinking that the file didn''t exsist but have maybe a single byte for reference purposes, obviously if the file didn''t exist you couldn''t unpack it. basically index the file into the smallest form of maybe a few digits of a code that would generate the file when decompressed.

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Are you saying you want to find an algorithm that can generate the original file based on a number between 0 and 255?

Or are you saying you want to make it look like the file isn''t there so the computers/routers/whatever don''t intentionally slow it down?

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Original post by Fade2Black
I am saying make the rest of the program disappear to the computer, except for a randomly generated (hexadecimal) number that is basically a ''key'' to the rest of the data that when it reads that key based on the algorithm, the decompressor knows what to put where, thus unpacking the file. So it''s a little of both.

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Original post by Senses777
Fuck, not this shit again.

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Original post by Fade2Black
Stuff about compression....

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void OMGAmazingCompression(string filename)
{
   FILE* f = open(filename);
   
   int fileSize = GetFileSize(f);

   byte* databuffer = new byte[filesize];
   byte* testbuffer = new byte[fileSize];

   fread(databuffer,filesize,1,f);
   fclose(f);
   
   int seed  = 0;

   do
   {
      srand(seed);
      for(int i = 0; i < filesize; i++)
      {
         testbuffer[i] = (byte)rand();
      }

      ++seed;      
   }while(!CompareData(dataBuffer,fileSize));

   f = fopen(strcat(filename),".oac"); // oac == OMG AMAZING COMPRESSION!!!1!!!

   fwrite(&seed,sizeof(seed),1,f);
   fwrite(&filesize,sizeof(filesize),1,f);
   fclose(f);

   delete[] databuffer;
   delete[] testbuffer;
}

void OMGAmazingDecompression(string filename)
{
   FILE* f = open(filename);
   
   int seed;
   int filesize;

   fread(seed,sizeof(int),1,f);
   fread(filesize,sizeof(int),1,f);
   fclose(f);

   byte* databuffer = new byte[fileSize];
   
   srand(seed -1); // -1 because seed got ++'ed at the end of the compression loop!

   for(int i = 0; i < filesize; i++)
   {
     databuffer[i] = (byte)rand();
   }

   filename[strlen(filename) - strlen(".oac")] = '\0';

   f = fopen(filename); 
   fwrite(&databuffer,filesize,1,f);
   fclose(f);

   delete[] databuffer;
}

const char hexchars[] = "0123456789ABCDEF";

void magic_compression(string filename)
{
    ifstream f(filename.c_str(), ios::binary);
    char c = f.get();
    string output_filename = filename + ''.'' + hexchars[c / 16] + hexchars[c % 16];
    ofstream g(output_filename.c_str(), ios::binary);
    g << f.rdbuf();
}

void magic_decompression(string filename)
{
    ifstream f(filename.c_str(), ios::binary);
    char c; sscanf(filename.c_str() + filename.size() - 2, "%2X", &c);
    string output_filename = filename.substr(0, filename.size() - 3);
    ofstream g(output_filename.c_str(), ios::binary);
    g << c << f.rdbuf();
}

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Original post by Beer Hunter
Compressing any nonempty file:

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