


#include <openssl/pem.h>
#include <openssl/cms.h>
#include <openssl/err.h>

int main(int argc, char **argv)
{
    BIO *in = NULL, *out = NULL;
    CMS_ContentInfo *cms = NULL;
    int ret = EXIT_FAILURE;

    
    int flags = CMS_STREAM;

    OpenSSL_add_all_algorithms();
    ERR_load_crypto_strings();

    

    in = BIO_new_file("comp.txt", "r");

    if (!in)
        goto err;

    
    cms = CMS_compress(in, NID_zlib_compression, flags);

    if (!cms)
        goto err;

    out = BIO_new_file("smcomp.txt", "w");
    if (!out)
        goto err;

    
    if (!SMIME_write_CMS(out, cms, in, flags))
        goto err;

    ret = EXIT_SUCCESS;

 err:

    if (ret != EXIT_SUCCESS) {
        fprintf(stderr, "Error Compressing Data\n");
        ERR_print_errors_fp(stderr);
    }

    CMS_ContentInfo_free(cms);
    BIO_free(in);
    BIO_free(out);
    return ret;
}
