int MAIN(int argc, char **argv)
	{
	PKCS7 *p7=NULL;
	int i,badops=0;
	BIO *in=NULL,*out=NULL;
	int informat,outformat;
	char *infile,*outfile,*prog;
	int print_certs=0,text=0,noout=0;
	int ret=0;

	apps_startup();

	if (bio_err == NULL)
		if ((bio_err=BIO_new(BIO_s_file())) != NULL)
			BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);

	infile=NULL;
	outfile=NULL;
	informat=FORMAT_PEM;
	outformat=FORMAT_PEM;

	prog=argv[0];
	argc--;
	argv++;
	while (argc >= 1)
		{
		if 	(strcmp(*argv,"-inform") == 0)
			{
			if (--argc < 1) goto bad;
			informat=str2fmt(*(++argv));
			}
		else if (strcmp(*argv,"-outform") == 0)
			{
			if (--argc < 1) goto bad;
			outformat=str2fmt(*(++argv));
			}
		else if (strcmp(*argv,"-in") == 0)
			{
			if (--argc < 1) goto bad;
			infile= *(++argv);
			}
		else if (strcmp(*argv,"-out") == 0)
			{
			if (--argc < 1) goto bad;
			outfile= *(++argv);
			}
		else if (strcmp(*argv,"-noout") == 0)
			noout=1;
		else if (strcmp(*argv,"-text") == 0)
			text=1;
		else if (strcmp(*argv,"-print_certs") == 0)
			print_certs=1;
		else
			{
			BIO_printf(bio_err,"unknown option %s\n",*argv);
			badops=1;
			break;
			}
		argc--;
		argv++;
		}

	if (badops)
		{
bad:
		BIO_printf(bio_err,"%s [options] <infile >outfile\n",prog);
		BIO_printf(bio_err,"where options are\n");
		BIO_printf(bio_err," -inform arg   input format - DER or PEM\n");
		BIO_printf(bio_err," -outform arg  output format - DER or PEM\n");
		BIO_printf(bio_err," -in arg       input file\n");
		BIO_printf(bio_err," -out arg      output file\n");
		BIO_printf(bio_err," -print_certs  print any certs or crl in the input\n");
		BIO_printf(bio_err," -text         print full details of certificates\n");
		BIO_printf(bio_err," -noout        don't output encoded data\n");
		EXIT(1);
		}

	ERR_load_crypto_strings();

	in=BIO_new(BIO_s_file());
	out=BIO_new(BIO_s_file());
	if ((in == NULL) || (out == NULL))
		{
		ERR_print_errors(bio_err);
                goto end;
                }

	if (infile == NULL)
		BIO_set_fp(in,stdin,BIO_NOCLOSE);
	else
		{
		if (BIO_read_filename(in,infile) <= 0)
		if (in == NULL)
			{
			perror(infile);
			goto end;
			}
		}

	if	(informat == FORMAT_ASN1)
		p7=d2i_PKCS7_bio(in,NULL);
	else if (informat == FORMAT_PEM)
		p7=PEM_read_bio_PKCS7(in,NULL,NULL,NULL);
	else
		{
		BIO_printf(bio_err,"bad input format specified for pkcs7 object\n");
		goto end;
		}
	if (p7 == NULL)
		{
		BIO_printf(bio_err,"unable to load PKCS7 object\n");
		ERR_print_errors(bio_err);
		goto end;
		}

	if (outfile == NULL)
		{
		BIO_set_fp(out,stdout,BIO_NOCLOSE);
#ifdef VMS
		{
		BIO *tmpbio = BIO_new(BIO_f_linebuffer());
		out = BIO_push(tmpbio, out);
		}
#endif
		}
	else
		{
		if (BIO_write_filename(out,outfile) <= 0)
			{
			perror(outfile);
			goto end;
			}
		}

	if (print_certs)
		{
		STACK_OF(X509) *certs=NULL;
		STACK_OF(X509_CRL) *crls=NULL;

		i=OBJ_obj2nid(p7->type);
		switch (i)
			{
		case NID_pkcs7_signed:
			certs=p7->d.sign->cert;
			crls=p7->d.sign->crl;
			break;
		case NID_pkcs7_signedAndEnveloped:
			certs=p7->d.signed_and_enveloped->cert;
			crls=p7->d.signed_and_enveloped->crl;
			break;
		default:
			break;
			}

		if (certs != NULL)
			{
			X509 *x;

			for (i=0; i<sk_X509_num(certs); i++)
				{
				x=sk_X509_value(certs,i);
				if(text) X509_print(out, x);
				else dump_cert_text(out, x);

				if(!noout) PEM_write_bio_X509(out,x);
				BIO_puts(out,"\n");
				}
			}
		if (crls != NULL)
			{
			X509_CRL *crl;

			for (i=0; i<sk_X509_CRL_num(crls); i++)
				{
				crl=sk_X509_CRL_value(crls,i);

				X509_CRL_print(out, crl);

				if(!noout)PEM_write_bio_X509_CRL(out,crl);
				BIO_puts(out,"\n");
				}
			}

		ret=0;
		goto end;
		}

	if(!noout) {
		if 	(outformat == FORMAT_ASN1)
			i=i2d_PKCS7_bio(out,p7);
		else if (outformat == FORMAT_PEM)
			i=PEM_write_bio_PKCS7(out,p7);
		else	{
			BIO_printf(bio_err,"bad output format specified for outfile\n");
			goto end;
			}

		if (!i)
			{
			BIO_printf(bio_err,"unable to write pkcs7 object\n");
			ERR_print_errors(bio_err);
			goto end;
			}
	}
	ret=0;
end:
	if (p7 != NULL) PKCS7_free(p7);
	if (in != NULL) BIO_free(in);
	if (out != NULL) BIO_free_all(out);
	EXIT(ret);
	}