[PATCH] Use GByteArray to implement RedsClientMonitorsConfig

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reds_on_main_agent_monitor_config() is manually implementing
a grow-on-append char *. glib's GByteArray can do this for us,
using it makes the code simpler to read.
---
 server/reds-private.h |  4 +---
 server/reds.c         | 27 +++++++++++++--------------
 2 files changed, 14 insertions(+), 17 deletions(-)

diff --git a/server/reds-private.h b/server/reds-private.h
index 9358d27..9d8b5d1 100644
--- a/server/reds-private.h
+++ b/server/reds-private.h
@@ -120,9 +120,7 @@ typedef struct SpiceCharDeviceStateItem {
  * client, being passed to the guest */
 typedef struct RedsClientMonitorsConfig {
     MainChannelClient *mcc;
-    uint8_t *buffer;
-    int buffer_size;
-    int buffer_pos;
+    GByteArray *config_data;
 } RedsClientMonitorsConfig;
 
 typedef struct RedsState {
diff --git a/server/reds.c b/server/reds.c
index 1456b75..18743a3 100644
--- a/server/reds.c
+++ b/server/reds.c
@@ -1079,10 +1079,10 @@ static void reds_client_monitors_config_cleanup(void)
 {
     RedsClientMonitorsConfig *cmc = &reds->client_monitors_config;
 
-    cmc->buffer_size = cmc->buffer_pos = 0;
-    free(cmc->buffer);
-    cmc->buffer = NULL;
-    cmc->mcc = NULL;
+    if (cmc->config_data != NULL) {
+        g_byte_array_free(cmc->config_data, TRUE);
+    }
+    cmc->config_data = NULL;
 }
 
 static void reds_on_main_agent_monitors_config(
@@ -1092,19 +1092,18 @@ static void reds_on_main_agent_monitors_config(
     VDAgentMonitorsConfig *monitors_config;
     RedsClientMonitorsConfig *cmc = &reds->client_monitors_config;
 
-    cmc->buffer_size += size;
-    cmc->buffer = realloc(cmc->buffer, cmc->buffer_size);
-    spice_assert(cmc->buffer);
     cmc->mcc = mcc;
-    memcpy(cmc->buffer + cmc->buffer_pos, message, size);
-    cmc->buffer_pos += 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\n", cmc->buffer_size);
+    if (cmc->config_data == NULL) {
+        cmc->config_data = g_byte_array_new();
+    }
+    g_byte_array_append(cmc->config_data, message, size);
+    msg_header = (VDAgentMessage *)cmc->config_data->data;
+    if (sizeof(VDAgentMessage) > cmc->config_data->len ||
+            msg_header->size > cmc->config_data->len - sizeof(VDAgentMessage)) {
+        spice_debug("not enough data yet. %d\n", cmc->config_data->len);
         return;
     }
-    monitors_config = (VDAgentMonitorsConfig *)(cmc->buffer + sizeof(*msg_header));
+    monitors_config = (VDAgentMonitorsConfig *)(cmc->config_data->data + sizeof(*msg_header));
     spice_debug("%s: %d\n", __func__, monitors_config->num_of_monitors);
     red_dispatcher_client_monitors_config(monitors_config);
     reds_client_monitors_config_cleanup();
-- 
1.8.3.1

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