add a bitset implementation

src/Makefile.am

@@ -556,6 +556,7 @@ libpulsecommon_@PA_MAJORMINORMICRO@_la_SOURCES = \
 		pulsecore/refcnt.h \
 		pulsecore/rtclock.c pulsecore/rtclock.h \
 		pulsecore/shm.c pulsecore/shm.h \
+		pulsecore/bitset.c pulsecore/bitset.h \
 		pulsecore/socket-client.c pulsecore/socket-client.h \
 		pulsecore/socket-server.c pulsecore/socket-server.h \
 		pulsecore/socket-util.c pulsecore/socket-util.h \

src/pulsecore/bitset.c

@@ -0,0 +1,67 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2009 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  PulseAudio 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+
+#include <pulse/xmalloc.h>
+
+#include "bitset.h"
+
+void pa_bitset_set(pa_bitset_t *b, unsigned k, pa_bool_t v) {
+    pa_assert(b);
+
+    if (v)
+        b[k >> 5] |= 1 << (k & 31);
+    else
+        b[k >> 5] &= ~((uint32_t) (1 << (k & 31)));
+}
+
+pa_bool_t pa_bitset_get(const pa_bitset_t *b, unsigned k) {
+    return !!(b[k >> 5] & (1 << (k & 31)));
+}
+
+pa_bool_t pa_bitset_equals(const pa_bitset_t *b, unsigned n, ...) {
+    va_list ap;
+    pa_bitset_t *a;
+    pa_bool_t equal;
+
+    a = pa_xnew0(pa_bitset_t, PA_BITSET_ELEMENTS(n));
+
+    va_start(ap, n);
+    for (;;) {
+        int j = va_arg(ap, int);
+
+        if (j < 0)
+            break;
+
+        pa_bitset_set(a, j, TRUE);
+    }
+    va_end(ap);
+
+    equal = memcmp(a, b, PA_BITSET_SIZE(n)) == 0;
+    pa_xfree(a);
+
+    return equal;
+}

src/pulsecore/bitset.h

@@ -0,0 +1,37 @@
+#ifndef foopulsecorebitsethfoo
+#define foopulsecorebitsethfoo
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2009 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  PulseAudio 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#include <inttypes.h>
+#include <pulsecore/macro.h>
+
+#define PA_BITSET_ELEMENTS(n) (((n)+31)/32)
+#define PA_BITSET_SIZE(n) (PA_BITSET_ELEMENTS(n)*32)
+
+typedef uint32_t pa_bitset_t;
+
+void pa_bitset_set(pa_bitset_t *b, unsigned k, pa_bool_t v);
+pa_bool_t pa_bitset_get(const pa_bitset_t *b, unsigned k);
+pa_bool_t pa_bitset_equals(const pa_bitset_t *b, unsigned n, ...);
+
+#endif