библиотека Zlib

#include <iostream.h>
#include <string>

#include "zlib/include/zlib.h"
#include "zlib/include/zconf.h"

void main(void) {
  char* data  = "Text for compression. abc/abc";

  Byte *Compr, *UnCompr;
  unsigned long ComprLen,UncomprLen;

  Compr    = (Byte*)malloc(ComprLen);
  UnCompr  = (Byte*)malloc(UncomprLen);

  strcpy(UnCompr, data);
  UncomprLen = sizeof(UnCompr);

  int rc;
  rc = compress(Compr, &ComprLen, UnCompr, UncomprLen);

  printf("\t %d \r\n", rc);
};