-fixes to ring buffer (fixes network error)

-fixes to invalid disabling of commands on scene tree dock

3 files changed, 9 insertions, 7 deletions

diff --git a/core/io/marshalls.cpp b/core/io/marshalls.cpp
index 1e76e2b4b2..62ccd81489 100644
--- a/core/io/marshalls.cpp
+++ b/core/io/marshalls.cpp
@@ -36,7 +36,10 @@ Error decode_variant(Variant& r_variant,const uint8_t *p_buffer, int p_len,int *
 	const uint8_t * buf=p_buffer;
 	int len=p_len;
 
-	ERR_FAIL_COND_V(len<4,ERR_INVALID_DATA);
+	if (len<4) {
+
+		ERR_FAIL_COND_V(len<4,ERR_INVALID_DATA);
+	}
 
 
 	uint32_t type=decode_uint32(buf);
diff --git a/core/io/packet_peer.cpp b/core/io/packet_peer.cpp
index 875cace368..f6d526b512 100644
--- a/core/io/packet_peer.cpp
+++ b/core/io/packet_peer.cpp
@@ -156,7 +156,6 @@ Error PacketPeerStream::_poll_buffer() const {
 	Error err = peer->get_partial_data(&temp_buffer[0], ring_buffer.space_left(), read);
 	if (err)
 		return err;
-
 	if (read==0)
 		return OK;
 
@@ -202,7 +201,7 @@ Error PacketPeerStream::get_packet(const uint8_t **r_buffer,int &r_buffer_size)
 	uint8_t lbuf[4];
 	ring_buffer.copy(lbuf,0,4);
 	remaining-=4;
-	uint32_t len = decode_uint32(lbuf);
+	uint32_t len = decode_uint32(lbuf);	
 	ERR_FAIL_COND_V(remaining<(int)len,ERR_UNAVAILABLE);
 
 	ring_buffer.read(lbuf,4); //get rid of first 4 bytes
diff --git a/core/ring_buffer.h b/core/ring_buffer.h
index de33de0c76..3cf9cf9064 100644
--- a/core/ring_buffer.h
+++ b/core/ring_buffer.h
@@ -141,15 +141,15 @@ public:
 	inline int space_left() {
 		int left = read_pos - write_pos;
 		if (left < 0) {
-			return size() + left;
+			return size() + left - 1;
 		};
 		if (left == 0) {
-			return size();
+			return size()-1;
 		};
-		return left;
+		return left -1;
 	};
 	inline int data_left() {
-		return size() - space_left();
+		return size() - space_left() - 1;
 	};
 	
 	inline int size() {