3 files changed, 33 insertions, 4 deletions
diff --git a/src/java/com/sun/gluegen/JavaMethodBindingEmitter.java b/src/java/com/sun/gluegen/JavaMethodBindingEmitter.java
index f7680c8..ecd83ac 100644
--- a/src/java/com/sun/gluegen/JavaMethodBindingEmitter.java
+++ b/src/java/com/sun/gluegen/JavaMethodBindingEmitter.java
@@ -745,12 +745,22 @@ public class JavaMethodBindingEmitter extends FunctionEmitter
       writer.println(";");
     } else if (returnType.isNIOBuffer()) {
       writer.println("    if (_res == null) return null;");
-      writer.print("    return BufferFactory.nativeOrder(_res)");
+      writer.println("    BufferFactory.nativeOrder(_res);");
       if (!returnType.isNIOByteBuffer()) {
-        String returnTypeName = returnType.getName().substring("java.nio.".length());
-        writer.print(".as" + returnTypeName + "()");
+        // See whether we have to expand pointers to longs
+        if (getBinding().getCReturnType().pointerDepth() >= 2) {
+          if (!returnType.isNIOLongBuffer()) {
+            throw new RuntimeException("While emitting glue code for " + getName() +
+                                       ": can not legally make pointers opaque to anything but longs");
+          }
+          writer.println("    return BufferFactory.asPointerBuffer(_res);");
+        } else {
+          String returnTypeName = returnType.getName().substring("java.nio.".length());
+          writer.println("    return _res.as" + returnTypeName + "()");
+        }
+      } else {
+        writer.println("    return _res;");
       }
-      writer.println(";");
     } else if (returnType.isArrayOfCompoundTypeWrappers()) {
       writer.println("    if (_res == null) return null;");
       writer.println("    " + getReturnTypeString(false) + " _retarray = new " + getReturnTypeString(true) + "[_res.length];");
diff --git a/src/java/com/sun/gluegen/JavaType.java b/src/java/com/sun/gluegen/JavaType.java
index 800c16f..1f795ef 100644
--- a/src/java/com/sun/gluegen/JavaType.java
+++ b/src/java/com/sun/gluegen/JavaType.java
@@ -339,6 +339,10 @@ public class JavaType {
             (java.nio.Buffer.class.isAssignableFrom(clazz.getComponentType())));
   }
 
+  public boolean isNIOLongBuffer() {
+    return (clazz == java.nio.LongBuffer.class);
+  }
+
   public boolean isString() {
     return (clazz == java.lang.String.class);
   }
diff --git a/src/java/com/sun/gluegen/runtime/BufferFactory.java.javase b/src/java/com/sun/gluegen/runtime/BufferFactory.java.javase
index a883316..3986bf6 100755
--- a/src/java/com/sun/gluegen/runtime/BufferFactory.java.javase
+++ b/src/java/com/sun/gluegen/runtime/BufferFactory.java.javase
@@ -281,4 +281,19 @@ public class BufferFactory {
       throw new IndexOutOfBoundsException("Required " + minBytesRemaining + " remaining bytes in buffer, only had " + bytesRemaining);
     }
   }
+
+  public static LongBuffer asPointerBuffer(ByteBuffer src) {
+    if (CPU.is32Bit()) {
+      // Must convert each pointer from 32-bit to 64-bit
+      IntBuffer buf = src.asIntBuffer();
+      int len = buf.capacity();
+      LongBuffer res = LongBuffer.wrap(new long[len]);
+      for (int i = 0; i < len; i++) {
+        res.put(i, buf.get(i));
+      }
+      return res;
+    } else {
+      return src.asLongBuffer();
+    }
+  }
 }