Add LZS test harness

Aside from the obvious correctness check, this can also be used to test
performance.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

Makefile.am

@@ -14,6 +14,9 @@ man8_MANS = openconnect.8
 AM_CFLAGS = @WFLAGS@
 AM_CPPFLAGS = -DLOCALEDIR="\"$(localedir)\""
 
+lzstest_SOURCES = lzstest.c
+noinst_PROGRAMS = lzstest
+
 openconnect_SOURCES = xml.c main.c
 openconnect_CFLAGS = $(AM_CFLAGS) $(SSL_CFLAGS) $(DTLS_SSL_CFLAGS) $(LIBXML2_CFLAGS) $(LIBPROXY_CFLAGS) $(ZLIB_CFLAGS) $(LIBSTOKEN_CFLAGS) $(LIBOATH_CFLAGS) $(LIBPSKC_CFLAGS) $(GSSAPI_CFLAGS) $(INTL_CFLAGS) $(ICONV_CFLAGS) $(LIBPCSCLITE_CFLAGS)
 openconnect_LDADD = libopenconnect.la $(LIBXML2_LIBS) $(LIBPROXY_LIBS) $(INTL_LIBS) $(ICONV_LIBS)

lzstest.c

@@ -0,0 +1,81 @@
+/*
+ * OpenConnect (SSL + DTLS) VPN client
+ *
+ * Copyright © 2008-2014 Intel Corporation.
+ * Copyright © 2008 Nick Andrew <nick@nick-andrew.net>
+ *
+ * Author: David Woodhouse <dwmw2@infradead.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ */
+
+#define __OPENCONNECT_INTERNAL_H__
+
+int lzs_decompress(unsigned char *dst, int dstlen, const unsigned char *src, int srclen);
+int lzs_compress(unsigned char *dst, int dstlen, const unsigned char *src, int srclen);
+
+#include "lzs.c"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+
+#define NR_PKTS 2048
+#define MAX_PKT 65536
+
+int main(void)
+{
+	int i, j, ret;
+	int pktlen;
+	unsigned char pktbuf[MAX_PKT + 3];
+	unsigned char comprbuf[MAX_PKT * 9 / 8 + 2];
+	unsigned char uncomprbuf[MAX_PKT];
+
+	srand(0xdeadbeef);
+
+	/* Just because we're lazy and fill the buffer three bytes at a time. */
+	if (RAND_MAX < 0x1000000) {
+		fprintf(stderr, "RAND_MAX 0x%x is smaller than we expect\n", RAND_MAX);
+		exit(1);
+	}
+
+	for (i = 0; i < NR_PKTS; i++) {
+		if (i)
+			pktlen = (random() % MAX_PKT) + 1;
+		else
+			pktlen = MAX_PKT;
+
+		for (j = 0; j < pktlen; j+= 3) {
+			int r = rand();
+#if __BYTE_ORDER == __BIG_ENDIAN
+			r <<= 8;
+#endif
+			*(int *)(pktbuf + j) = r;
+		}		
+
+		ret = lzs_compress(comprbuf, sizeof(comprbuf), pktbuf, pktlen);
+		if (ret < 0) {
+			fprintf(stderr, "Compressing packet %d failed: %s\n", i, strerror(-ret));
+			exit(1);
+		}
+		ret = lzs_decompress(uncomprbuf, pktlen, comprbuf, sizeof(comprbuf));
+		if (ret != pktlen) {
+			fprintf(stderr, "Compressing packet %d failed\n", i);
+			exit(1);
+		}
+		if (memcmp(uncomprbuf, pktbuf, pktlen)) {
+			fprintf(stderr, "Comparing packet %d failed\n", i);
+			exit(1);
+		}
+	}
+
+	return 0;
+}