/*

 * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

/* Simple S/MIME compress example */

#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 = 1;

    /*

     * On OpenSSL 1.0.0+ only:

     * for streaming set CMS_STREAM

     */

    int flags = CMS_STREAM;

    OpenSSL_add_all_algorithms();

    ERR_load_crypto_strings();

    /* Open content being compressed */

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

    if (!in)

        goto err;

    /* compress content */

    cms = CMS_compress(in, NID_zlib_compression, flags);

    if (!cms)

        goto err;

    out = BIO_new_file("smcomp.txt", "w");

    if (!out)

        goto err;

    /* Write out S/MIME message */

    if (!SMIME_write_CMS(out, cms, in, flags))

        goto err;

    ret = 0;

 err:

    if (ret) {

        fprintf(stderr, "Error Compressing Data\n");

        ERR_print_errors_fp(stderr);

    }

    CMS_ContentInfo_free(cms);

    BIO_free(in);

    BIO_free(out);

    return ret;

}