Overhaul the Roland VFS plugin to be cleaner.

.gitignore

@@ -23,3 +23,4 @@ manifest.mf
 opencode.json
 fluxengine.iml
 /nbproject/private/
+images/

java/com/cowlark/fluxengine/cli/AbstractVfsCommand.java

@@ -1,6 +1,7 @@
 package com.cowlark.fluxengine.cli;
 
 import com.cowlark.fluxengine.config.ConfigBuilder;
+import com.cowlark.fluxengine.core.LogMessage;
 import com.cowlark.fluxengine.core.Logger;
 import com.cowlark.fluxengine.core.flags.BoolFlag;
 import com.cowlark.fluxengine.core.flags.FlagGroup;
@@ -48,8 +49,12 @@ protected void applyVfsFlags(ConfigBuilder builder)
 
         if (!loggingFlag.get())
         {
-            Logger.setLogger(Consumers.nop());
+            Logger.setLogger(AbstractVfsCommand::log);
             System.setProperty("org.slf4j.simpleLogger.defaultLogLevel", "ERROR");
         }
     }
+
+    private static void log(LogMessage message)
+    {
+    }
 }

java/com/cowlark/fluxengine/core/ByteReader.java

@@ -67,6 +67,12 @@ public Bytes read(int len)
         return slice;
     }
 
+    public Bytes readPadded(int len)
+    {
+        int remaining = Math.min(len, remaining());
+        return read(remaining).slice(0, len);
+    }
+
     public void readInto(byte[] buffer, int length)
     {
         if (length > buffer.length)

java/com/cowlark/fluxengine/vfs/BlockDevice.java

@@ -92,8 +92,9 @@ public void putBlocks(int blockNumber, Bytes bytes) throws FileSystemException
 
         while (!br.eof())
         {
-            Bytes block = br.read(getBlockSize());
-            putBlock(blockNumber++, block);
+            Bytes block = br.readPadded(getBlockSize());
+            putBlock(blockNumber, block);
+            blockNumber++;
         }
     }
 

java/com/cowlark/fluxengine/vfs/Filesystem.java

@@ -9,6 +9,7 @@
 import lombok.Builder;
 import org.slf4j.LoggerFactory;
 import java.io.IOException;
+import java.nio.file.FileSystemException;
 
 public abstract class Filesystem implements AutoCloseable
 {
@@ -199,4 +200,21 @@ public record Dirent(VfsPath path, String filename, int length, String mode, Fil
                          ImmutableMap<String, String> attributes)
     {
     }
+
+    protected class FluxEngineFileSystemException extends FileSystemException
+    {
+        private final Exception cause;
+
+        public FluxEngineFileSystemException(String file, Exception cause)
+        {
+            super(file);
+            this.cause = cause;
+        }
+
+        @Override
+        public Exception getCause()
+        {
+            return cause;
+        }
+    }
 }