GUACAMOLE-629: Define constant for maximum blob size.

src/libguac/encode-jpeg.c

@@ -59,7 +59,7 @@ typedef struct guac_jpeg_destination_mgr {
     /**
      * The output buffer.
      */
-    unsigned char buffer[6048];
+    unsigned char buffer[GUAC_PROTOCOL_BLOB_MAX_LENGTH];
 
 } guac_jpeg_destination_mgr;
 

src/libguac/encode-png.c

@@ -56,7 +56,7 @@ typedef struct guac_png_write_state {
     /**
      * Buffer of pending PNG data.
      */
-    char buffer[6048];
+    char buffer[GUAC_PROTOCOL_BLOB_MAX_LENGTH];
 
     /**
      * The number of bytes currently stored in the buffer.

src/libguac/encode-webp.c

@@ -52,7 +52,7 @@ typedef struct guac_webp_stream_writer {
     /**
      * Buffer of pending WebP data.
      */
-    char buffer[6048];
+    char buffer[GUAC_PROTOCOL_BLOB_MAX_LENGTH];
 
     /**
      * The number of bytes currently stored in the buffer.

src/libguac/guacamole/protocol-constants.h

@@ -40,5 +40,14 @@
  */
 #define GUACAMOLE_PROTOCOL_VERSION "VERSION_1_1_0"
 
+/**
+ * The maximum number of bytes that should be sent in any one blob instruction
+ * to ensure the instruction does not exceed the maximum allowed instruction
+ * size.
+ *
+ * @see GUAC_INSTRUCTION_MAX_LENGTH 
+ */
+#define GUAC_PROTOCOL_BLOB_MAX_LENGTH 6048
+
 #endif
 

src/libguac/raw_encoder.c

@@ -129,8 +129,8 @@ static void raw_encoder_flush_handler(guac_audio_stream* audio) {
 
         /* Determine size of blob to be written */
         int chunk_size = remaining;
-        if (chunk_size > 6048)
-            chunk_size = 6048;
+        if (chunk_size > GUAC_PROTOCOL_BLOB_MAX_LENGTH)
+            chunk_size = GUAC_PROTOCOL_BLOB_MAX_LENGTH;
 
         /* Send audio data */
         guac_protocol_send_blob(socket, stream, current, chunk_size);