2 files changed, 9 insertions, 9 deletions

diff --git a/src/ch/epfl/xblast/RunLengthEncoder.java b/src/ch/epfl/xblast/RunLengthEncoder.java
index d7ab106..3784e0d 100644
--- a/src/ch/epfl/xblast/RunLengthEncoder.java
+++ b/src/ch/epfl/xblast/RunLengthEncoder.java
@@ -171,10 +171,10 @@ public final class RunLengthEncoder {
     public static List<Byte> encode(List<Byte> bl) {
         List<RunLength> rll = bl.stream().map(RunLength::new).collect(Collectors.toList());
 
-        return collapseRunLengths(rll).stream()
+        return Collections.unmodifiableList(collapseRunLengths(rll).stream()
                 .flatMap(rl -> rl.split().stream())
                 .flatMap(rl -> rl.encode().stream())
-                .collect(Collectors.toList());
+                .collect(Collectors.toList()));
     }
 
     /**
@@ -184,9 +184,9 @@ public final class RunLengthEncoder {
      * @return the decoded byte sequence
      */
     public static List<Byte> decode(List<Byte> el) {
-        return decodeRunLengths(el).stream()
+        return Collections.unmodifiableList(decodeRunLengths(el).stream()
                 .flatMap(rl -> rl.expand().stream())
-                .collect(Collectors.toList());
+                .collect(Collectors.toList()));
     }
 
-}
\ No newline at end of file
+}
diff --git a/src/ch/epfl/xblast/server/GameStateSerializer.java b/src/ch/epfl/xblast/server/GameStateSerializer.java
index 7747ecb..a471962 100644
--- a/src/ch/epfl/xblast/server/GameStateSerializer.java
+++ b/src/ch/epfl/xblast/server/GameStateSerializer.java
@@ -109,9 +109,9 @@ public final class GameStateSerializer {
      * @return the serialized players
      */
     private static List<Byte> serializePlayers(List<Player> players, int tick) {
-        return players.stream()
+        return Collections.unmodifiableList(players.stream()
                 .flatMap(p -> serializePlayer(p, tick).stream())
-                .collect(Collectors.toList());
+                .collect(Collectors.toList()));
     }
 
     /**
@@ -142,12 +142,12 @@ public final class GameStateSerializer {
      * @return the serialized GameState
      */
     public static List<Byte> serialize(BoardPainter bp, GameState gs) {
-        return Stream.of(
+        return Collections.unmodifiableList(Stream.of(
                 prependSize(serializeBoard(bp, gs.board())),
                 prependSize(serializeExplosions(gs.bombedCells(), gs.blastedCells(), gs.board())),
                 serializePlayers(gs.players(), gs.ticks()),
                 serializeRemainingTime(gs.remainingTime())
-        ).flatMap(List::stream).collect(Collectors.toList());
+        ).flatMap(List::stream).collect(Collectors.toList()));
     }
 
 }