tagstruct: Distinguish pa_tagstruct_new() use cases

pa_tagstruct_new() is called either with no data, i.e. (NULL, 0)
to create a dynamic tagstruct or with a pointer to fixed data

introduce a new function pa_tagstruct_new_fixed() for the latter case

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>

11 files changed, 70 insertions, 57 deletions

diff --git a/src/modules/module-card-restore.c b/src/modules/module-card-restore.c
index baa2f4fb1..f5577dbdd 100644
--- a/src/modules/module-card-restore.c
+++ b/src/modules/module-card-restore.c
@@ -195,7 +195,7 @@ static bool entry_write(struct userdata *u, const char *name, const struct entry
     pa_assert(name);
     pa_assert(e);
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu8(t, e->version);
     pa_tagstruct_puts(t, e->profile);
     pa_tagstruct_putu32(t, pa_hashmap_size(e->ports));
@@ -273,7 +273,7 @@ static struct entry* entry_read(struct userdata *u, const char *name) {
         return NULL;
     }
 
-    t = pa_tagstruct_new(data.data, data.size);
+    t = pa_tagstruct_new_fixed(data.data, data.size);
     e = entry_new();
 
     if (pa_tagstruct_getu8(t, &e->version) < 0 ||
diff --git a/src/modules/module-device-manager.c b/src/modules/module-device-manager.c
index 46a695567..f125bddc2 100644
--- a/src/modules/module-device-manager.c
+++ b/src/modules/module-device-manager.c
@@ -207,7 +207,7 @@ static bool entry_write(struct userdata *u, const char *name, const struct entry
     pa_assert(name);
     pa_assert(e);
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu8(t, e->version);
     pa_tagstruct_puts(t, e->description);
     pa_tagstruct_put_boolean(t, e->user_set_description);
@@ -295,7 +295,7 @@ static struct entry* entry_read(struct userdata *u, const char *name) {
     if (!pa_database_get(u->database, &key, &data))
         goto fail;
 
-    t = pa_tagstruct_new(data.data, data.size);
+    t = pa_tagstruct_new_fixed(data.data, data.size);
     e = entry_new();
 
     if (pa_tagstruct_getu8(t, &e->version) < 0 ||
@@ -449,7 +449,7 @@ static void notify_subscribers(struct userdata *u) {
     PA_IDXSET_FOREACH(c, u->subscribed, idx) {
         pa_tagstruct *t;
 
-        t = pa_tagstruct_new(NULL, 0);
+        t = pa_tagstruct_new();
         pa_tagstruct_putu32(t, PA_COMMAND_EXTENSION);
         pa_tagstruct_putu32(t, 0);
         pa_tagstruct_putu32(t, u->module->index);
@@ -1130,7 +1130,7 @@ static int extension_cb(pa_native_protocol *p, pa_module *m, pa_native_connectio
   if (pa_tagstruct_getu32(t, &command) < 0)
     goto fail;
 
-  reply = pa_tagstruct_new(NULL, 0);
+  reply = pa_tagstruct_new();
   pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
   pa_tagstruct_putu32(reply, tag);
 
diff --git a/src/modules/module-device-restore.c b/src/modules/module-device-restore.c
index 70a651713..f515de795 100644
--- a/src/modules/module-device-restore.c
+++ b/src/modules/module-device-restore.c
@@ -151,7 +151,7 @@ static void trigger_save(struct userdata *u, pa_device_type_t type, uint32_t sin
         PA_IDXSET_FOREACH(c, u->subscribed, idx) {
             pa_tagstruct *t;
 
-            t = pa_tagstruct_new(NULL, 0);
+            t = pa_tagstruct_new();
             pa_tagstruct_putu32(t, PA_COMMAND_EXTENSION);
             pa_tagstruct_putu32(t, 0);
             pa_tagstruct_putu32(t, u->module->index);
@@ -200,7 +200,7 @@ static bool entry_write(struct userdata *u, const char *name, const struct entry
     pa_assert(name);
     pa_assert(e);
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu8(t, e->version);
     pa_tagstruct_put_boolean(t, e->port_valid);
     pa_tagstruct_puts(t, e->port);
@@ -236,7 +236,7 @@ static struct entry* entry_read(struct userdata *u, const char *name) {
         return NULL;
     }
 
-    t = pa_tagstruct_new(data.data, data.size);
+    t = pa_tagstruct_new_fixed(data.data, data.size);
     e = entry_new();
 
     if (pa_tagstruct_getu8(t, &e->version) < 0 ||
@@ -371,7 +371,7 @@ static bool perportentry_write(struct userdata *u, const char *basekeyname, cons
     n_formats = pa_idxset_size(e->formats);
     pa_assert(n_formats > 0);
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu8(t, e->version);
     pa_tagstruct_put_boolean(t, e->volume_valid);
     pa_tagstruct_put_channel_map(t, &e->channel_map);
@@ -417,7 +417,7 @@ static struct perportentry* perportentry_read(struct userdata *u, const char *ba
     if (!pa_database_get(u->database, &key, &data))
         goto fail;
 
-    t = pa_tagstruct_new(data.data, data.size);
+    t = pa_tagstruct_new_fixed(data.data, data.size);
     e = perportentry_new(false);
 
     if (pa_tagstruct_getu8(t, &e->version) < 0 ||
@@ -1041,7 +1041,7 @@ static int extension_cb(pa_native_protocol *p, pa_module *m, pa_native_connectio
     if (pa_tagstruct_getu32(t, &command) < 0)
         goto fail;
 
-    reply = pa_tagstruct_new(NULL, 0);
+    reply = pa_tagstruct_new();
     pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
     pa_tagstruct_putu32(reply, tag);
 
diff --git a/src/modules/module-stream-restore.c b/src/modules/module-stream-restore.c
index 30c971787..397b58ff8 100644
--- a/src/modules/module-stream-restore.c
+++ b/src/modules/module-stream-restore.c
@@ -992,7 +992,7 @@ static bool entry_write(struct userdata *u, const char *name, const struct entry
     pa_assert(name);
     pa_assert(e);
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu8(t, e->version);
     pa_tagstruct_put_boolean(t, e->volume_valid);
     pa_tagstruct_put_channel_map(t, &e->channel_map);
@@ -1124,7 +1124,7 @@ static struct entry *entry_read(struct userdata *u, const char *name) {
     if (!pa_database_get(u->database, &key, &data))
         goto fail;
 
-    t = pa_tagstruct_new(data.data, data.size);
+    t = pa_tagstruct_new_fixed(data.data, data.size);
     e = entry_new();
 
     if (pa_tagstruct_getu8(t, &e->version) < 0 ||
@@ -1201,7 +1201,7 @@ static void trigger_save(struct userdata *u) {
     PA_IDXSET_FOREACH(c, u->subscribed, idx) {
         pa_tagstruct *t;
 
-        t = pa_tagstruct_new(NULL, 0);
+        t = pa_tagstruct_new();
         pa_tagstruct_putu32(t, PA_COMMAND_EXTENSION);
         pa_tagstruct_putu32(t, 0);
         pa_tagstruct_putu32(t, u->module->index);
@@ -2016,7 +2016,7 @@ static int extension_cb(pa_native_protocol *p, pa_module *m, pa_native_connectio
     if (pa_tagstruct_getu32(t, &command) < 0)
         goto fail;
 
-    reply = pa_tagstruct_new(NULL, 0);
+    reply = pa_tagstruct_new();
     pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
     pa_tagstruct_putu32(reply, tag);
 
diff --git a/src/modules/module-tunnel.c b/src/modules/module-tunnel.c
index 7c233c9ec..833423a58 100644
--- a/src/modules/module-tunnel.c
+++ b/src/modules/module-tunnel.c
@@ -447,7 +447,7 @@ static void stream_cork(struct userdata *u, bool cork) {
     if (!u->pstream)
         return;
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
 #ifdef TUNNEL_SINK
     pa_tagstruct_putu32(t, PA_COMMAND_CORK_PLAYBACK_STREAM);
 #else
@@ -880,7 +880,7 @@ static void request_latency(struct userdata *u) {
     uint32_t tag;
     pa_assert(u);
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
 #ifdef TUNNEL_SINK
     pa_tagstruct_putu32(t, PA_COMMAND_GET_PLAYBACK_LATENCY);
 #else
@@ -942,7 +942,7 @@ static void update_description(struct userdata *u) {
                           pa_get_user_name(un, sizeof(un)),
                           pa_get_host_name(hn, sizeof(hn)));
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
 #ifdef TUNNEL_SINK
     pa_tagstruct_putu32(t, PA_COMMAND_SET_PLAYBACK_STREAM_NAME);
 #else
@@ -1362,14 +1362,14 @@ static void request_info(struct userdata *u) {
     uint32_t tag;
     pa_assert(u);
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_GET_SERVER_INFO);
     pa_tagstruct_putu32(t, tag = u->ctag++);
     pa_pstream_send_tagstruct(u->pstream, t);
     pa_pdispatch_register_reply(u->pdispatch, tag, DEFAULT_TIMEOUT, server_info_cb, u, NULL);
 
 #ifdef TUNNEL_SINK
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_GET_SINK_INPUT_INFO);
     pa_tagstruct_putu32(t, tag = u->ctag++);
     pa_tagstruct_putu32(t, u->device_index);
@@ -1377,7 +1377,7 @@ static void request_info(struct userdata *u) {
     pa_pdispatch_register_reply(u->pdispatch, tag, DEFAULT_TIMEOUT, sink_input_info_cb, u, NULL);
 
     if (u->sink_name) {
-        t = pa_tagstruct_new(NULL, 0);
+        t = pa_tagstruct_new();
         pa_tagstruct_putu32(t, PA_COMMAND_GET_SINK_INFO);
         pa_tagstruct_putu32(t, tag = u->ctag++);
         pa_tagstruct_putu32(t, PA_INVALID_INDEX);
@@ -1387,7 +1387,7 @@ static void request_info(struct userdata *u) {
     }
 #else
     if (u->source_name) {
-        t = pa_tagstruct_new(NULL, 0);
+        t = pa_tagstruct_new();
         pa_tagstruct_putu32(t, PA_COMMAND_GET_SOURCE_INFO);
         pa_tagstruct_putu32(t, tag = u->ctag++);
         pa_tagstruct_putu32(t, PA_INVALID_INDEX);
@@ -1434,7 +1434,7 @@ static void start_subscribe(struct userdata *u) {
     pa_tagstruct *t;
     pa_assert(u);
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_SUBSCRIBE);
     pa_tagstruct_putu32(t, u->ctag++);
     pa_tagstruct_putu32(t, PA_SUBSCRIPTION_MASK_SERVER|
@@ -1619,7 +1619,7 @@ static void setup_complete_callback(pa_pdispatch *pd, uint32_t command, uint32_t
                 pa_get_host_name(hn, sizeof(hn)));
 #endif
 
-    reply = pa_tagstruct_new(NULL, 0);
+    reply = pa_tagstruct_new();
     pa_tagstruct_putu32(reply, PA_COMMAND_SET_CLIENT_NAME);
     pa_tagstruct_putu32(reply, u->ctag++);
 
@@ -1637,7 +1637,7 @@ static void setup_complete_callback(pa_pdispatch *pd, uint32_t command, uint32_t
     pa_pstream_send_tagstruct(u->pstream, reply);
     /* We ignore the server's reply here */
 
-    reply = pa_tagstruct_new(NULL, 0);
+    reply = pa_tagstruct_new();
 
     if (u->version < 13)
         /* Only for older PA versions we need to fill in the maxlength */
@@ -1841,7 +1841,7 @@ static void on_connection(pa_socket_client *sc, pa_iochannel *io, void *userdata
     pa_pstream_set_receive_memblock_callback(u->pstream, pstream_memblock_callback, u);
 #endif
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_AUTH);
     pa_tagstruct_putu32(t, tag = u->ctag++);
     pa_tagstruct_putu32(t, PA_PROTOCOL_VERSION);
@@ -1880,7 +1880,7 @@ static void sink_set_volume(pa_sink *sink) {
     u = sink->userdata;
     pa_assert(u);
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_SET_SINK_INPUT_VOLUME);
     pa_tagstruct_putu32(t, u->ctag++);
     pa_tagstruct_putu32(t, u->device_index);
@@ -1900,7 +1900,7 @@ static void sink_set_mute(pa_sink *sink) {
     if (u->version < 11)
         return;
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_SET_SINK_INPUT_MUTE);
     pa_tagstruct_putu32(t, u->ctag++);
     pa_tagstruct_putu32(t, u->device_index);
diff --git a/src/pulse/context.c b/src/pulse/context.c
index 30d3eaba4..738ea84ff 100644
--- a/src/pulse/context.c
+++ b/src/pulse/context.c
@@ -369,7 +369,7 @@ static void handle_srbchannel_memblock(pa_context *c, pa_memblock *memblock) {
     }
 
     /* Ack the enable command */
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_ENABLE_SRBCHANNEL);
     pa_tagstruct_putu32(t, c->srb_setup_tag);
     pa_pstream_send_tagstruct(c->pstream, t);
@@ -1305,7 +1305,7 @@ pa_tagstruct *pa_tagstruct_command(pa_context *c, uint32_t command, uint32_t *ta
     pa_assert(c);
     pa_assert(tag);
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, command);
     pa_tagstruct_putu32(t, *tag = c->ctag++);
 
@@ -1479,7 +1479,7 @@ static void pa_command_disable_srbchannel(pa_pdispatch *pd, uint32_t command, ui
     }
 
     /* Send disable command back again */
-    t2 = pa_tagstruct_new(NULL, 0);
+    t2 = pa_tagstruct_new();
     pa_tagstruct_putu32(t2, PA_COMMAND_DISABLE_SRBCHANNEL);
     pa_tagstruct_putu32(t2, tag);
     pa_pstream_send_tagstruct(c->pstream, t2);
diff --git a/src/pulsecore/pdispatch.c b/src/pulsecore/pdispatch.c
index c258c0beb..7837ee309 100644
--- a/src/pulsecore/pdispatch.c
+++ b/src/pulsecore/pdispatch.c
@@ -305,7 +305,7 @@ int pa_pdispatch_run(pa_pdispatch *pd, pa_packet *packet, const pa_cmsg_ancil_da
     if (packet->length <= 8)
         goto finish;
 
-    ts = pa_tagstruct_new(packet->data, packet->length);
+    ts = pa_tagstruct_new_fixed(packet->data, packet->length);
 
     if (pa_tagstruct_getu32(ts, &command) < 0 ||
         pa_tagstruct_getu32(ts, &tag) < 0)
diff --git a/src/pulsecore/protocol-native.c b/src/pulsecore/protocol-native.c
index f54f2a44a..ba9b40664 100644
--- a/src/pulsecore/protocol-native.c
+++ b/src/pulsecore/protocol-native.c
@@ -757,7 +757,7 @@ static void record_stream_send_killed(record_stream *r) {
     pa_tagstruct *t;
     record_stream_assert_ref(r);
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_RECORD_STREAM_KILLED);
     pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
     pa_tagstruct_putu32(t, r->index);
@@ -818,7 +818,7 @@ static int playback_stream_process_msg(pa_msgobject *o, int code, void*userdata,
                     break;
             }
 
-            t = pa_tagstruct_new(NULL, 0);
+            t = pa_tagstruct_new();
             pa_tagstruct_putu32(t, PA_COMMAND_REQUEST);
             pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
             pa_tagstruct_putu32(t, s->index);
@@ -839,7 +839,7 @@ static int playback_stream_process_msg(pa_msgobject *o, int code, void*userdata,
 #endif
 
             /* Report that we're empty */
-            t = pa_tagstruct_new(NULL, 0);
+            t = pa_tagstruct_new();
             pa_tagstruct_putu32(t, PA_COMMAND_UNDERFLOW);
             pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
             pa_tagstruct_putu32(t, s->index);
@@ -853,7 +853,7 @@ static int playback_stream_process_msg(pa_msgobject *o, int code, void*userdata,
             pa_tagstruct *t;
 
             /* Notify the user we're overflowed*/
-            t = pa_tagstruct_new(NULL, 0);
+            t = pa_tagstruct_new();
             pa_tagstruct_putu32(t, PA_COMMAND_OVERFLOW);
             pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
             pa_tagstruct_putu32(t, s->index);
@@ -867,7 +867,7 @@ static int playback_stream_process_msg(pa_msgobject *o, int code, void*userdata,
                 pa_tagstruct *t;
 
                 /* Notify the user we started playback */
-                t = pa_tagstruct_new(NULL, 0);
+                t = pa_tagstruct_new();
                 pa_tagstruct_putu32(t, PA_COMMAND_STARTED);
                 pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
                 pa_tagstruct_putu32(t, s->index);
@@ -887,7 +887,7 @@ static int playback_stream_process_msg(pa_msgobject *o, int code, void*userdata,
             if (s->connection->version >= 15) {
                 pa_tagstruct *t;
 
-                t = pa_tagstruct_new(NULL, 0);
+                t = pa_tagstruct_new();
                 pa_tagstruct_putu32(t, PA_COMMAND_PLAYBACK_BUFFER_ATTR_CHANGED);
                 pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
                 pa_tagstruct_putu32(t, s->index);
@@ -1285,7 +1285,7 @@ static void playback_stream_send_killed(playback_stream *p) {
     pa_tagstruct *t;
     playback_stream_assert_ref(p);
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_PLAYBACK_STREAM_KILLED);
     pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
     pa_tagstruct_putu32(t, p->index);
@@ -1747,7 +1747,7 @@ static void sink_input_send_event_cb(pa_sink_input *i, const char *event, pa_pro
     if (s->connection->version < 15)
       return;
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_PLAYBACK_STREAM_EVENT);
     pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
     pa_tagstruct_putu32(t, s->index);
@@ -1768,7 +1768,7 @@ static void sink_input_suspend_cb(pa_sink_input *i, bool suspend) {
     if (s->connection->version < 12)
       return;
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_PLAYBACK_STREAM_SUSPENDED);
     pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
     pa_tagstruct_putu32(t, s->index);
@@ -1795,7 +1795,7 @@ static void sink_input_moving_cb(pa_sink_input *i, pa_sink *dest) {
     if (s->connection->version < 12)
       return;
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_PLAYBACK_STREAM_MOVED);
     pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
     pa_tagstruct_putu32(t, s->index);
@@ -1885,7 +1885,7 @@ static void source_output_send_event_cb(pa_source_output *o, const char *event,
     if (s->connection->version < 15)
       return;
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_RECORD_STREAM_EVENT);
     pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
     pa_tagstruct_putu32(t, s->index);
@@ -1906,7 +1906,7 @@ static void source_output_suspend_cb(pa_source_output *o, bool suspend) {
     if (s->connection->version < 12)
       return;
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_RECORD_STREAM_SUSPENDED);
     pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
     pa_tagstruct_putu32(t, s->index);
@@ -1934,7 +1934,7 @@ static void source_output_moving_cb(pa_source_output *o, pa_source *dest) {
     if (s->connection->version < 12)
       return;
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_RECORD_STREAM_MOVED);
     pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
     pa_tagstruct_putu32(t, s->index);
@@ -1975,7 +1975,7 @@ if (!(expression)) { \
 static pa_tagstruct *reply_new(uint32_t tag) {
     pa_tagstruct *reply;
 
-    reply = pa_tagstruct_new(NULL, 0);
+    reply = pa_tagstruct_new();
     pa_tagstruct_putu32(reply, PA_COMMAND_REPLY);
     pa_tagstruct_putu32(reply, tag);
     return reply;
@@ -2619,7 +2619,7 @@ static void setup_srbchannel(pa_native_connection *c) {
     pa_srbchannel_export(srb, &srbt);
 
     /* Send enable command to client */
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_ENABLE_SRBCHANNEL);
     pa_tagstruct_putu32(t, (size_t) srb); /* tag */
     fdlist[0] = srbt.readfd;
@@ -3744,7 +3744,7 @@ static void subscription_cb(pa_core *core, pa_subscription_event_type_t e, uint3
 
     pa_native_connection_assert_ref(c);
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_SUBSCRIBE_EVENT);
     pa_tagstruct_putu32(t, (uint32_t) -1);
     pa_tagstruct_putu32(t, e);
@@ -5037,7 +5037,7 @@ static void client_send_event_cb(pa_client *client, const char*event, pa_proplis
     if (c->version < 15)
       return;
 
-    t = pa_tagstruct_new(NULL, 0);
+    t = pa_tagstruct_new();
     pa_tagstruct_putu32(t, PA_COMMAND_CLIENT_EVENT);
     pa_tagstruct_putu32(t, (uint32_t) -1); /* tag */
     pa_tagstruct_puts(t, event);
diff --git a/src/pulsecore/pstream-util.c b/src/pulsecore/pstream-util.c
index 356d28c2a..1c39f784e 100644
--- a/src/pulsecore/pstream-util.c
+++ b/src/pulsecore/pstream-util.c
@@ -84,7 +84,7 @@ void pa_pstream_send_tagstruct_with_fds(pa_pstream *p, pa_tagstruct *t, int nfd,
 void pa_pstream_send_error(pa_pstream *p, uint32_t tag, uint32_t error) {
     pa_tagstruct *t;
 
-    pa_assert_se(t = pa_tagstruct_new(NULL, 0));
+    pa_assert_se(t = pa_tagstruct_new());
     pa_tagstruct_putu32(t, PA_COMMAND_ERROR);
     pa_tagstruct_putu32(t, tag);
     pa_tagstruct_putu32(t, error);
@@ -94,7 +94,7 @@ void pa_pstream_send_error(pa_pstream *p, uint32_t tag, uint32_t error) {
 void pa_pstream_send_simple_ack(pa_pstream *p, uint32_t tag) {
     pa_tagstruct *t;
 
-    pa_assert_se(t = pa_tagstruct_new(NULL, 0));
+    pa_assert_se(t = pa_tagstruct_new());
     pa_tagstruct_putu32(t, PA_COMMAND_REPLY);
     pa_tagstruct_putu32(t, tag);
     pa_pstream_send_tagstruct(p, t);
diff --git a/src/pulsecore/tagstruct.c b/src/pulsecore/tagstruct.c
index bf123d509..251618aef 100644
--- a/src/pulsecore/tagstruct.c
+++ b/src/pulsecore/tagstruct.c
@@ -48,16 +48,28 @@ struct pa_tagstruct {
     bool dynamic;
 };
 
-pa_tagstruct *pa_tagstruct_new(const uint8_t* data, size_t length) {
+pa_tagstruct *pa_tagstruct_new(void) {
     pa_tagstruct*t;
 
-    pa_assert(!data || (data && length));
+    t = pa_xnew(pa_tagstruct, 1);
+    t->data = NULL;
+    t->allocated = t->length = 0;
+    t->rindex = 0;
+    t->dynamic = true;
+
+    return t;
+}
+
+pa_tagstruct *pa_tagstruct_new_fixed(const uint8_t* data, size_t length) {
+    pa_tagstruct*t;
+
+    pa_assert(data && length);
 
     t = pa_xnew(pa_tagstruct, 1);
     t->data = (uint8_t*) data;
-    t->allocated = t->length = data ? length : 0;
+    t->allocated = t->length = length;
     t->rindex = 0;
-    t->dynamic = !data;
+    t->dynamic = false;
 
     return t;
 }
diff --git a/src/pulsecore/tagstruct.h b/src/pulsecore/tagstruct.h
index 6319ee92e..e67adc114 100644
--- a/src/pulsecore/tagstruct.h
+++ b/src/pulsecore/tagstruct.h
@@ -60,7 +60,8 @@ enum {
     PA_TAG_FORMAT_INFO = 'f',
 };
 
-pa_tagstruct *pa_tagstruct_new(const uint8_t* data, size_t length);
+pa_tagstruct *pa_tagstruct_new(void);
+pa_tagstruct *pa_tagstruct_new_fixed(const uint8_t* data, size_t length);
 void pa_tagstruct_free(pa_tagstruct*t);
 uint8_t* pa_tagstruct_free_data(pa_tagstruct*t, size_t *l);