1 files changed, 9 insertions, 13 deletions
diff --git a/server/map.go b/server/map.go
index e84ca55..f210d42 100644
--- a/server/map.go
+++ b/server/map.go
@@ -95,6 +95,9 @@ func (v *blockVolume) unsyncSetBlock(p blockPos, t blockType) {
 }
 
 func (v *blockVolume) unsyncFlushChanges() {
+	if len(v.changes) == 0 {
+		return
+	}
 	var (
 		oldRuns = v.blockRuns
 		changes = v.changes
@@ -198,21 +201,14 @@ func (v *blockVolume) unsyncBlocksInRange(min, max blockPos) []blockType {
 func (v *blockVolume) syncCompressForNetwork(/*highBits bool*/) io.ReadCloser {
 	rd, wr := io.Pipe()
 	go func() {
-		defer wr.Close()
-		z := gzip.NewWriter(wr)
-		defer z.Close()
-		bw := bufio.NewWriter(z)
-		defer bw.Flush()
-
 		v.RLock()
 		defer v.RUnlock()
-		binary.Write(bw, binary.BigEndian, uint32(v.size.X*v.size.Y*v.size.Z))
-		for block := range v.unsyncGetAll() {
-			err := bw.WriteByte(byte(block))
-			if err != nil {
-				return
-			}
-		}
+		bw := bufio.NewWriter(wr)
+		defer bw.Flush()
+		writePointlessGzipHeader(bw)
+		len := uint32(v.size.X*v.size.Y*v.size.Z)
+		deflateRuns(wr, v.blockRuns, v.changes, len)
+		writePointlessGzipTrailer(bw, len)
 	}()
 	return rd
 }