1 files changed, 178 insertions, 0 deletions
diff --git a/libjava/classpath/javax/imageio/stream/FileCacheImageOutputStream.java b/libjava/classpath/javax/imageio/stream/FileCacheImageOutputStream.java
new file mode 100644
index 000000000..1d73a05e5
--- /dev/null
+++ b/libjava/classpath/javax/imageio/stream/FileCacheImageOutputStream.java
@@ -0,0 +1,178 @@
+/* FileCacheImageOutputStream.java --
+   Copyright (C) 2004  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.imageio.stream;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.RandomAccessFile;
+
+/**
+ * @author Michael Koch (konqueror@gmx.de)
+ */
+public class FileCacheImageOutputStream extends ImageOutputStreamImpl
+{
+  private OutputStream stream;
+  private File cacheFile;
+  private RandomAccessFile cache;
+  private long maxPos;
+
+  public FileCacheImageOutputStream(OutputStream s, File cacheDir)
+    throws IOException
+  {
+    stream = s;
+    cacheFile = File.createTempFile("imageio", ".tmp", cacheDir);
+    cache = new RandomAccessFile(cacheFile, "rw");
+    maxPos = 0;
+  }
+
+  public void close()
+    throws IOException
+  {
+    maxPos = cache.length();
+    seek(maxPos);
+    flushBefore(maxPos);
+    super.close();
+    cache.close();
+    cacheFile.delete();
+    stream.flush();
+    stream = null;
+  }
+
+  public boolean isCached()
+  {
+    return true;
+  }
+
+  public boolean isCachedFile()
+  {
+    return true;
+  }
+
+  public boolean isCachedMemory()
+  {
+    return false;
+  }
+
+  public int read()
+    throws IOException
+  {
+    bitOffset = 0;
+    int val = cache.read();
+    if (val != -1)
+      streamPos++;
+    return val;
+  }
+
+  public int read(byte[] data, int offset, int len)
+    throws IOException
+  {
+    bitOffset = 0;
+    int num = cache.read(data, offset, len);
+    if (num != -1)
+      streamPos += num;
+    return num;
+  }
+
+  public void write(byte[] data, int offset, int len)
+    throws IOException
+  {
+    flushBits();
+    cache.write(data, offset, len);
+    streamPos += len;
+    maxPos = Math.max(streamPos, maxPos);
+  }
+
+  public void write(int value)
+    throws IOException
+  {
+    flushBits();
+    cache.write(value);
+    streamPos++;
+    maxPos = Math.max(streamPos, maxPos);
+  }
+
+  public long length()
+  {
+    long l;
+    try
+      {
+        l = cache.length();
+      }
+    catch (IOException ex)
+      {
+        l = -1;
+      }
+    return l;
+  }
+
+  public void seek(long pos)
+    throws IOException
+  {
+    checkClosed();
+    if (pos < flushedPos)
+      throw new IndexOutOfBoundsException();
+    cache.seek(pos);
+    streamPos = cache.getFilePointer();
+    maxPos = Math.max(streamPos, maxPos);
+    bitOffset = 0;
+  }
+
+  public void flushBefore(long pos)
+    throws IOException
+  {
+    long oldPos = flushedPos;
+    super.flushBefore(pos);
+    long flushed = flushedPos - oldPos;
+    if (flushed > 0)
+      {
+        int len = 512;
+        byte[] buf = new byte[len];
+        cache.seek(oldPos);
+        while (flushed > 0)
+          {
+            int l = (int) Math.min(flushed, len);
+            cache.readFully(buf, 0, l);
+            stream.write(buf, 0, l);
+            flushed -= l;
+          }
+        stream.flush();
+      }
+  }
+}