BufferedImageDecoder causing severe native memory leak due to Deflater not being closed properly

[arwi-grape]

Method com.flagstone.transform.util.image.BufferedImageDecoder#zip(byte[]) uses java.util.zip.Deflater to compress data - but the Deflater is not ended properly (missing call to Deflater#end()) causing allocated native memory not to be released.

Code to reproduce:

  public static void main(String[] args) throws Exception {
    String imageFile = args[0];
    BufferedImage indexedColorModelImage = ImageIO.read(new File(imageFile));
    for (int i = 0; i < 100000; i++) {
      BufferedImageDecoder decoder = new BufferedImageDecoder();
      decoder.read(indexedColorModelImage);
      ImageTag tag = decoder.defineImage(i);
    }
  }

Provide 1 command line param - a path to a PNG file. Attaching sample PNG below (PNG 8bit indexed).

Issue occurs on Java 1.6 and 1.7 - regardless of the update number.