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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/*
   This program is a quine. That means, it outputs its own source when run.
   The global variable sourceCode simply contains a base64 encoding of
   everything that follows -- the code only has to print it as data, and then
   as code. Idea taken from http://www.madore.org/~david/computers/quine.html
   (not stolen, but the same principle is applied).
   This should compile under any C99-compliant compiler, and it's not limited
   to any specific architecture.
   The base64 encoding uses + and / as 62 and 63, and omits trailing equals.
   
   If you read this you're a noob.
*/

void outputData(const char *);
char * base64_decode(const char *);
unsigned char base64_index(char);

inline void output (const char * string) {
  // let's spare me some typing
  printf("%s", string);
}

int main (void) {
  output("const char * sourceCode =\n"); // first of all, the declaration...
  outputData(sourceCode); // ...and then the data it contains
  char * parsedCode = base64_decode(sourceCode); // decode the data
  output(parsedCode);  // and output the code (in the decoded data)
  free(parsedCode); // release the buffer that base64_decode() acquired
  return 0;
}

void outputData (const char * string) {
  // 64 characters per line, other than the last line
  // last line has the semicolon
  char buffer[65];
  buffer[64] = 0; // make sure the null terminator is already there
  const char * current;
  unsigned remainder = strlen(string);
  for (current = string; remainder >= 64; current += 64, remainder -= 64) {
    // iterate for every 64 characters of the string, until not enough remain
    output("  \""); // every line starts like this
    memcpy(buffer, current, 64); // the current 64 characters
    output(buffer);
    output("\"\n"); // and every line ends like this
  }
  output("  \""); // the final line of the data declaration
  memcpy(buffer, current, remainder);
  buffer[remainder] = 0; // make sure the terminator is in the right place!
  output(buffer);
  output("\";\n\n"); // last line has a semicolon, and two newlines
}

char * base64_decode (const char * data) {
  // this just decodes the base64 encoded data and returns the result
  char * result = malloc(strlen(data) + 1); // this will certainly suffice
  unsigned remaining = strlen(data);
  const char * current; // current pointer to the source buffer
  char * insertion; // insertion pointer to the destination buffer
  unsigned char decodings[4]; // temporary buffer
  unsigned char i;
  for (current = data, insertion = result; // initial values
       remaining >= 4; // iterate while there's at least 4 bytes to decode
       current += 4, insertion += 3, remaining -= 4) { // increment and such
    for (i = 0; i < 4; i ++) decodings[i] = base64_index(current[i]);
    // and now decode the base64 data. This code is awful, I know
    insertion[0] = (decodings[0] << 2) | (decodings[1] >> 4);
    insertion[1] = ((decodings[1] & 15) << 4) | (decodings[2] >> 2);
    insertion[2] = ((decodings[2] & 3) << 6) | decodings[3];
  }
  if (remaining) // if something remains, decode it too
    for (i = 0; i < remaining; i ++) decodings[i] = base64_index(current[i]);
  switch (remaining) {
    case 3:
      insertion[1] = ((decodings[1] & 15) << 4) | (decodings[2] >> 2);
      // no break on purpose!
    case 2:
      insertion[0] = (decodings[0] << 2) | (decodings[1] >> 4);
  }
  insertion += remaining ? remaining : 1; // ugly, but works
  insertion[-1] = 0; // before the wtf, this just adds a null terminator
  return realloc(result, insertion - result); // okay, you can wtf now
}

unsigned char base64_index (char character) {
  // this function returns a number from 0 to 63 indicating what the value
  // of a certain base64 encoding character is
  // A-Z: 0-25, a-z: 26-51, 0-9: 52-61, +: 62, /: 63
  if (character == '+') return 62;
  if (character == '/') return 63;
  if ((character >= '0') && (character <= '9')) return character + 52 - '0';
  if ((character >= 'A') && (character <= 'Z')) return character - 'A';
  if ((character >= 'a') && (character <= 'z')) return character + 26 - 'a';
  return 255; // invalid value
}