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

int main()
{
  const char *istream = "some foo汉字";
  uLong srcLen = strlen(istream)+1;      // +1 for the trailing `\0`
  uLong destLen = compressBound(srcLen); // this is how you should estimate size 
                                         // needed for the buffer
  unsigned char* ostream = (unsigned char*)malloc(destLen);
  int res = compress(ostream, &destLen, (const unsigned char *)istream, srcLen); 
  // destLen is now the size of actuall buffer needed for compression
  // you don't want to uncompress whole buffer later, just the used part
  if(res == Z_BUF_ERROR){
    printf("Buffer was too small!\n");
    return 1;
  }
  if(res ==  Z_MEM_ERROR){
    printf("Not enough memory for compression!\n");
    return 2;
  }

  unsigned char *i2stream = ostream;
  char* o2stream = (char *)malloc(srcLen);
  uLong destLen2 = destLen; //destLen is the actual size of the compressed buffer
  int des = uncompress((unsigned char *)o2stream, &srcLen, i2stream, destLen2);
  printf("%s\n", o2stream);
  return 0;
}