Add BlobExtractor to extract SET, ST*, and FRS blobs from jarfiles

src/main/java/sh/shh/midi/Main.java

@@ -0,0 +1,15 @@
+package sh.shh.midi;
+
+import sh.shh.midi.roland.BlobExtractor;
+
+import java.io.IOException;
+
+public class Main {
+    public static void main(String[] args) {
+        try {
+            BlobExtractor.extractAll("lib/test.jar", "out");
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

src/main/java/sh/shh/midi/roland/BlobExtractor.java

@@ -0,0 +1,44 @@
+package sh.shh.midi.roland;
+
+import org.apache.commons.io.IOUtils;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class BlobExtractor {
+    private static final Pattern REGEX = Pattern.compile("^*/?([^/.]+\\.(SET|ST\\d|FRS))$", Pattern.CASE_INSENSITIVE);
+
+    public static void extractAll(String jarFileName, String outputDir) throws IOException {
+        System.out.println("Extracting " + jarFileName);
+        JarFile jarFile = new JarFile(jarFileName);
+        jarFile.stream()
+                .filter(jarEntry -> REGEX.matcher(jarEntry.getName()).find())
+                .forEach(jarEntry -> extract(jarFile, jarEntry, outputDir));
+    }
+
+    static void extract(JarFile jarFile, JarEntry jarEntry, String outputDir) {
+        try {
+            Matcher matcher = REGEX.matcher(jarEntry.getName());
+            matcher.find();
+            String extractedFileName = matcher.group(1);
+            File outputFile = new File(outputDir, extractedFileName);
+            System.out.println("Extracting " + jarEntry.getName() + " -> " + outputFile.getPath());
+            if (!outputFile.exists()) {
+                outputFile.createNewFile();
+            }
+            FileOutputStream os = new FileOutputStream(outputFile);
+            InputStream is = jarFile.getInputStream(jarEntry);
+            IOUtils.copy(is, os);
+            is.close();
+            os.close();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}