Migrate decoding to line-buffered reader

Migrate all usages of StreamReader in the context of decoding beatmaps,
storyboards or skins to the new LineBufferedReader.

osu.Game.Tests/Beatmaps/Formats/LegacyBeatmapDecoderTest.cs

@@ -2,7 +2,6 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
-using System.IO;
 using NUnit.Framework;
 using osuTK;
 using osuTK.Graphics;
@@ -13,6 +12,7 @@ using osu.Game.Beatmaps;
 using osu.Game.Rulesets.Objects.Types;
 using osu.Game.Beatmaps.Formats;
 using osu.Game.Beatmaps.Timing;
+using osu.Game.IO;
 using osu.Game.Rulesets.Catch.Beatmaps;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Rulesets.Objects;
@@ -30,13 +30,9 @@ namespace osu.Game.Tests.Beatmaps.Formats
         public void TestDecodeBeatmapVersion()
         {
             using (var resStream = TestResources.OpenResource("beatmap-version.osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var decoder = Decoder.GetDecoder<Beatmap>(stream);
-
-                stream.BaseStream.Position = 0;
-                stream.DiscardBufferedData();
-
                 var working = new TestWorkingBeatmap(decoder.Decode(stream));
 
                 Assert.AreEqual(6, working.BeatmapInfo.BeatmapVersion);
@@ -51,7 +47,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder { ApplyOffsets = false };
 
             using (var resStream = TestResources.OpenResource("Soleily - Renatus (Gamu) [Insane].osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var beatmap = decoder.Decode(stream);
                 var beatmapInfo = beatmap.BeatmapInfo;
@@ -75,7 +71,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder();
 
             using (var resStream = TestResources.OpenResource("Soleily - Renatus (Gamu) [Insane].osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var beatmapInfo = decoder.Decode(stream).BeatmapInfo;
 
@@ -101,7 +97,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder();
 
             using (var resStream = TestResources.OpenResource("Soleily - Renatus (Gamu) [Insane].osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var beatmap = decoder.Decode(stream);
                 var beatmapInfo = beatmap.BeatmapInfo;
@@ -126,7 +122,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder();
 
             using (var resStream = TestResources.OpenResource("Soleily - Renatus (Gamu) [Insane].osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var difficulty = decoder.Decode(stream).BeatmapInfo.BaseDifficulty;
 
@@ -145,7 +141,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder { ApplyOffsets = false };
 
             using (var resStream = TestResources.OpenResource("Soleily - Renatus (Gamu) [Insane].osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var beatmap = decoder.Decode(stream);
                 var metadata = beatmap.Metadata;
@@ -164,7 +160,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder { ApplyOffsets = false };
 
             using (var resStream = TestResources.OpenResource("Soleily - Renatus (Gamu) [Insane].osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var beatmap = decoder.Decode(stream);
                 var controlPoints = beatmap.ControlPointInfo;
@@ -239,7 +235,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder { ApplyOffsets = false };
 
             using (var resStream = TestResources.OpenResource("overlapping-control-points.osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var controlPoints = decoder.Decode(stream).ControlPointInfo;
 
@@ -271,7 +267,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacySkinDecoder();
 
             using (var resStream = TestResources.OpenResource("Soleily - Renatus (Gamu) [Insane].osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var comboColors = decoder.Decode(stream).ComboColours;
 
@@ -297,7 +293,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder();
 
             using (var resStream = TestResources.OpenResource("hitobject-combo-offset.osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var beatmap = decoder.Decode(stream);
 
@@ -320,7 +316,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder();
 
             using (var resStream = TestResources.OpenResource("hitobject-combo-offset.osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var beatmap = decoder.Decode(stream);
 
@@ -343,7 +339,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder { ApplyOffsets = false };
 
             using (var resStream = TestResources.OpenResource("Soleily - Renatus (Gamu) [Insane].osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var hitObjects = decoder.Decode(stream).HitObjects;
 
@@ -371,7 +367,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder { ApplyOffsets = false };
 
             using (var resStream = TestResources.OpenResource("controlpoint-custom-samplebank.osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var hitObjects = decoder.Decode(stream).HitObjects;
 
@@ -393,7 +389,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder { ApplyOffsets = false };
 
             using (var resStream = TestResources.OpenResource("hitobject-custom-samplebank.osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var hitObjects = decoder.Decode(stream).HitObjects;
 
@@ -411,7 +407,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder { ApplyOffsets = false };
 
             using (var resStream = TestResources.OpenResource("hitobject-file-samples.osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var hitObjects = decoder.Decode(stream).HitObjects;
 
@@ -431,7 +427,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder { ApplyOffsets = false };
 
             using (var resStream = TestResources.OpenResource("slider-samples.osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var hitObjects = decoder.Decode(stream).HitObjects;
 
@@ -475,7 +471,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder { ApplyOffsets = false };
 
             using (var resStream = TestResources.OpenResource("hitobject-no-addition-bank.osu"))
-            using (var stream = new StreamReader(resStream))
+            using (var stream = new LineBufferedReader(resStream))
             {
                 var hitObjects = decoder.Decode(stream).HitObjects;
 
@@ -489,7 +485,7 @@ namespace osu.Game.Tests.Beatmaps.Formats
             var decoder = new LegacyBeatmapDecoder { ApplyOffsets = false };
 
             using (var badResStream = TestResources.OpenResource("invalid-events.osu"))
-            using (var badStream = new StreamReader(badResStream))
+            using (var badStream = new LineBufferedReader(badResStream))
             {
                 Assert.DoesNotThrow(() => decoder.Decode(badStream));
             }