1/* Simple S/MIME compress example */
2#include <openssl/pem.h>
3#include <openssl/cms.h>
4#include <openssl/err.h>
5
6int main(int argc, char **argv)
7	{
8	BIO *in = NULL, *out = NULL;
9	CMS_ContentInfo *cms = NULL;
10	int ret = 1;
11
12	/*
13	 * On OpenSSL 0.9.9 only:
14	 * for streaming set CMS_STREAM
15	 */
16	int flags = CMS_STREAM;
17
18	OpenSSL_add_all_algorithms();
19	ERR_load_crypto_strings();
20
21	/* Open content being compressed */
22
23	in = BIO_new_file("comp.txt", "r");
24
25	if (!in)
26		goto err;
27
28	/* compress content */
29	cms = CMS_compress(in, NID_zlib_compression, flags);
30
31	if (!cms)
32		goto err;
33
34	out = BIO_new_file("smcomp.txt", "w");
35	if (!out)
36		goto err;
37
38	/* Write out S/MIME message */
39	if (!SMIME_write_CMS(out, cms, in, flags))
40		goto err;
41
42	ret = 0;
43
44	err:
45
46	if (ret)
47		{
48		fprintf(stderr, "Error Compressing Data\n");
49		ERR_print_errors_fp(stderr);
50		}
51
52	if (cms)
53		CMS_ContentInfo_free(cms);
54	if (in)
55		BIO_free(in);
56	if (out)
57		BIO_free(out);
58
59	return ret;
60
61	}
62