[spice-server] reds: Replace RedsClientMonitorsConfig with SpiceBuffer

[Christophe Fergeau <cfergeau@xxxxxxxxxx>]

RedsClientMonitorsConfig duplicates what SpiceBuffer does,
so using we can replace it with SpiceBuffer and make
reds_on_main_agent_monitors_config() simpler.

Signed-off-by: Christophe Fergeau <cfergeau@xxxxxxxxxx>
---
 server/reds-private.h |  8 +-------
 server/reds.c         | 29 ++++++++---------------------
 2 files changed, 9 insertions(+), 28 deletions(-)

diff --git a/server/reds-private.h b/server/reds-private.h
index 915bcf6fd..f5be8eff5 100644
--- a/server/reds-private.h
+++ b/server/reds-private.h
@@ -61,12 +61,6 @@ typedef struct RedsMigTargetClient {
 
 /* Intermediate state for on going monitors config message from a single
  * client, being passed to the guest */
-typedef struct RedsClientMonitorsConfig {
-    uint8_t *buffer;
-    int buffer_size;
-    int buffer_pos;
-} RedsClientMonitorsConfig;
-
 typedef struct ChannelSecurityOptions ChannelSecurityOptions;
 
 typedef struct RedSSLParameters {
@@ -126,7 +120,7 @@ struct RedsState {
 #endif
     int allow_multiple_clients;
 
-    RedsClientMonitorsConfig client_monitors_config;
+    SpiceBuffer client_monitors_config;
     int mm_time_enabled;
     uint32_t mm_time_latency;
 
diff --git a/server/reds.c b/server/reds.c
index 09b674d7b..b543eacfe 100644
--- a/server/reds.c
+++ b/server/reds.c
@@ -1102,37 +1102,25 @@ void reds_release_agent_data_buffer(RedsState *reds, uint8_t *buf)
     dev->priv->recv_from_client_buf_pushed = FALSE;
 }
 
-static void reds_client_monitors_config_cleanup(RedsState *reds)
-{
-    RedsClientMonitorsConfig *cmc = &reds->client_monitors_config;
-
-    cmc->buffer_size = cmc->buffer_pos = 0;
-    free(cmc->buffer);
-    cmc->buffer = NULL;
-}
-
 static void reds_on_main_agent_monitors_config(RedsState *reds,
         MainChannelClient *mcc, const void *message, size_t size)
 {
     VDAgentMessage *msg_header;
     VDAgentMonitorsConfig *monitors_config;
-    RedsClientMonitorsConfig *cmc = &reds->client_monitors_config;
+    SpiceBuffer *cmc;
 
-    cmc->buffer_size += size;
-    cmc->buffer = realloc(cmc->buffer, cmc->buffer_size);
-    spice_assert(cmc->buffer);
-    memcpy(cmc->buffer + cmc->buffer_pos, message, size);
-    cmc->buffer_pos += size;
+    cmc = &reds->client_monitors_config;
+    spice_buffer_append(cmc, message, size);
     msg_header = (VDAgentMessage *)cmc->buffer;
-    if (sizeof(VDAgentMessage) > cmc->buffer_size ||
-            msg_header->size > cmc->buffer_size - sizeof(VDAgentMessage)) {
-        spice_debug("not enough data yet. %d", cmc->buffer_size);
+    if (sizeof(VDAgentMessage) > cmc->offset ||
+            msg_header->size > cmc->offset - sizeof(VDAgentMessage)) {
+        spice_debug("not enough data yet. %zd", cmc->offset);
         return;
     }
     monitors_config = (VDAgentMonitorsConfig *)(cmc->buffer + sizeof(*msg_header));
     spice_debug("%s: %d", __func__, monitors_config->num_of_monitors);
     reds_client_monitors_config(reds, monitors_config);
-    reds_client_monitors_config_cleanup(reds);
+    spice_buffer_free(cmc);
 }
 
 void reds_on_main_agent_data(RedsState *reds, MainChannelClient *mcc, const void *message,
@@ -3410,6 +3398,7 @@ static int do_spice_init(RedsState *reds, SpiceCoreInterface *core_interface)
     reds->char_devices = NULL;
     reds->mig_wait_disconnect_clients = NULL;
     reds->vm_running = TRUE; /* for backward compatibility */
+    spice_buffer_free(&reds->client_monitors_config);
 
     if (!(reds->mig_timer = reds->core.timer_add(&reds->core, migrate_timeout, reds))) {
         spice_error("migration timer create failed");
@@ -3438,8 +3427,6 @@ static int do_spice_init(RedsState *reds, SpiceCoreInterface *core_interface)
 
     reds->mouse_mode = SPICE_MOUSE_MODE_SERVER;
 
-    reds_client_monitors_config_cleanup(reds);
-
     reds->allow_multiple_clients = getenv(SPICE_DEBUG_ALLOW_MC_ENV) != NULL;
     if (reds->allow_multiple_clients) {
         spice_warning("spice: allowing multiple client connections");
-- 
2.13.0

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