1 files changed, 143 insertions, 0 deletions
diff --git a/lib/isc/portset.c b/lib/isc/portset.c
new file mode 100644
index 0000000..471ca8e
--- /dev/null
+++ b/lib/isc/portset.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2008  Internet Systems Consortium, Inc. ("ISC")
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* $Id: portset.c,v 1.4 2008/06/24 23:24:35 marka Exp $ */
+
+/*! \file */
+
+#include <config.h>
+
+#include <isc/mem.h>
+#include <isc/portset.h>
+#include <isc/string.h>
+#include <isc/types.h>
+#include <isc/util.h>
+
+#define ISC_PORTSET_BUFSIZE (65536 / (sizeof(isc_uint32_t) * 8))
+
+/*%
+ * Internal representation of portset.  It's an array of 32-bit integers, each
+ * bit corresponding to a single port in the ascending order.  For example,
+ * the second most significant bit of buf[0] corresponds to port 1.
+ */
+struct isc_portset {
+	unsigned int nports;	/*%< number of ports in the set */
+	isc_uint32_t buf[ISC_PORTSET_BUFSIZE];
+};
+
+static inline isc_boolean_t
+portset_isset(isc_portset_t *portset, in_port_t port) {
+	return (ISC_TF((portset->buf[port >> 5] & (1 << (port & 31))) != 0));
+}
+
+static inline void
+portset_add(isc_portset_t *portset, in_port_t port) {
+	if (!portset_isset(portset, port)) {
+		portset->nports++;
+		portset->buf[port >> 5] |= (1 << (port & 31));
+	}
+}
+
+static inline void
+portset_remove(isc_portset_t *portset, in_port_t port) {
+	if (portset_isset(portset, port)) {
+		portset->nports--;
+		portset->buf[port >> 5] &= ~(1 << (port & 31));
+	}
+}
+
+isc_result_t
+isc_portset_create(isc_mem_t *mctx, isc_portset_t **portsetp) {
+	isc_portset_t *portset;
+
+	REQUIRE(portsetp != NULL && *portsetp == NULL);
+
+	portset = isc_mem_get(mctx, sizeof(*portset));
+	if (portset == NULL)
+		return (ISC_R_NOMEMORY);
+
+	/* Make the set 'empty' by default */
+	memset(portset, 0, sizeof(*portset));
+	*portsetp = portset;
+
+	return (ISC_R_SUCCESS);
+}
+
+void
+isc_portset_destroy(isc_mem_t *mctx, isc_portset_t **portsetp) {
+	isc_portset_t *portset;
+
+	REQUIRE(portsetp != NULL);
+	portset = *portsetp;
+
+	isc_mem_put(mctx, portset, sizeof(*portset));
+}
+
+isc_boolean_t
+isc_portset_isset(isc_portset_t *portset, in_port_t port) {
+	REQUIRE(portset != NULL);
+
+	return (portset_isset(portset, port));
+}
+
+unsigned int
+isc_portset_nports(isc_portset_t *portset) {
+	REQUIRE(portset != NULL);
+
+	return (portset->nports);
+}
+
+void
+isc_portset_add(isc_portset_t *portset, in_port_t port) {
+	REQUIRE(portset != NULL);
+
+	portset_add(portset, port);
+}
+
+void
+isc_portset_remove(isc_portset_t *portset, in_port_t port) {
+	portset_remove(portset, port);
+}
+
+void
+isc_portset_addrange(isc_portset_t *portset, in_port_t port_lo,
+		     in_port_t port_hi)
+{
+	in_port_t p;
+
+	REQUIRE(portset != NULL);
+	REQUIRE(port_lo <= port_hi);
+
+	p = port_lo;
+	do {
+		portset_add(portset, p);
+	} while (p++ < port_hi);
+}
+
+void
+isc_portset_removerange(isc_portset_t *portset, in_port_t port_lo,
+			in_port_t port_hi)
+{
+	in_port_t p;
+
+	REQUIRE(portset != NULL);
+	REQUIRE(port_lo <= port_hi);
+
+	p = port_lo;
+	do {
+		portset_remove(portset, p);
+	} while (p++ < port_hi);
+}