06.2026

plugins/fiji/sparseviewer/mda/XdrInput.java

@@ -0,0 +1,87 @@
+package sparseviewer.mda;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+
+
+public class XdrInput {
+
+    private final RandomAccessFile raf;
+
+    public XdrInput(File file) throws IOException {
+        this.raf = new RandomAccessFile(file, "r");
+    }
+    public void close() throws IOException {
+        raf.close();
+}
+    public long getFilePointer() throws IOException {
+        return raf.getFilePointer();
+    }
+    public void seek(long position) throws IOException {
+        raf.seek(position);
+    }
+    public int readInt() throws IOException {
+        return raf.readInt();
+    }
+    public float readFloat() throws IOException {
+        return raf.readFloat();
+    }
+    public double readDouble() throws IOException {
+        return raf.readDouble();
+    }
+    public int[] readIntArray(int n) throws IOException {
+        int[] values = new int[n];
+
+        for (int i = 0; i < n; i++) {
+            values[i] = readInt();
+        }
+
+        return values;
+    }
+
+    public String readXdrString() throws IOException {
+        int length = readInt();
+
+        if (length <= 0) {
+            return "";
+        }
+
+        byte[] bytes = new byte[length];
+        raf.readFully(bytes);
+
+        int pad = padding(length);
+        if (pad > 0) {
+            raf.skipBytes(pad);
+        }
+
+        return new String(bytes, "UTF-8");
+    }
+
+    /**
+     * MDA writes many strings as:
+     *   int n
+     *   if n > 0: xdr_string
+     *
+     * The xdr_string itself again contains length + bytes + padding.
+     */
+    public String readStringWithLeadingLength() throws IOException {
+        int n = readInt();
+
+        if (n <= 0) {
+            return "";
+        }
+
+        return readXdrString();
+    }
+
+    private int padding(int length) {
+        int r = length % 4;
+
+        if (r == 0) {
+            return 0;
+        }
+        return 4 - r;
+    }
+
+}