#include <stdio.h>
#include <stdlib.h>
#include "zlib/zlib.h"

#define err(str)	fwrite(str "\n", 1, strlen(str)+2, stderr)

int main(int argc, char **argv) {
  FILE *file;
  int compsize,uncompsize,actuncompsize; //assumed to be 32bit long
  int resuncomp; //to hold the result of uncompress
  char *inputstream,*outputstream;
  if (argc < 2) { err("Give the file as a second argument."); return 1; }
  
  if ((file = fopen(argv[1],"rb")) == NULL) { perror("Could not open the file for reading"); return 1; }
  
  if (fseek(file, (long int) 254, SEEK_SET) != 0) {
	perror("Error setting the position for reading");
	return 1;
  }
  
  if (fread(&compsize, 4, 1, file) == 0) {
	perror("Could not read the size of the input stream");
	return 1;
  };
  inputstream = malloc (compsize);
  if (inputstream == NULL) {
	perror("Could not allocate memory for the input stream");
	return 1;
  };
  
  if (fread(&uncompsize, 4, 1, file) == 0) {
	perror("Could not read the size of the output stream");
	return 1;
  }
  outputstream = malloc (uncompsize);
  
  if (inputstream == NULL) {
	perror("Could not allocate memory for the output stream");
	return 1;
  };
   
  if (fread(inputstream, 1, compsize, file) < compsize) {
	perror("Could not read the input stream");
	return 1;
  };
  if (fclose(file) != 0)  { perror("Error closing the file"); return 1; }
  
  actuncompsize = uncompsize;
  actuncompsize = 1000000; outputstream = realloc (outputstream,1000000); //testing purposes
  resuncomp = uncompress(outputstream, &actuncompsize, inputstream, compsize);
  printf("input size %i, actual output size %i, "
	"expected output size %i\n",compsize,actuncompsize,uncompsize);
  //if (resuncomp != Z_OK) { err("Error uncompressing the input stream."); return 1; }
  //if (uncompsize != actuncompsize) { perror("Output stream had an unexpected size."); return 1; }
  
  
  printf("Written: %u bytes\n",fwrite(outputstream, 1, actuncompsize, fopen("t:\\j\\out.txt","wb")));

  return 0;
}