--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/internal/image/PngInputStream.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,62 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+module dwt.internal.image;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public class PngInputStream : InputStream {
+    PngChunkReader reader;
+    PngChunk chunk;
+    int offset, length;
+    
+    final static int DATA_OFFSET = 8; 
+    
+public PngInputStream(PngIdatChunk chunk, PngChunkReader reader) {
+    this.chunk = chunk;
+    this.reader = reader;
+    length = chunk.getLength();
+    offset = 0;
+}
+
+private bool checkChunk() throws IOException {
+    while (offset is length) {
+        chunk = reader.readNextChunk();
+        if (chunk is null) throw new IOException();
+        if (chunk.getChunkType() is PngChunk.CHUNK_IEND) return false;
+        if (chunk.getChunkType() !is PngChunk.CHUNK_IDAT) throw new IOException();
+        length = chunk.getLength();
+        offset = 0;
+    }
+    return true;
+}
+
+public void close() throws IOException {
+    chunk = null;
+}
+
+public int read() throws IOException {
+    if (chunk is null) throw new IOException();
+    if (offset is length && !checkChunk()) return -1;
+    int b = chunk.reference[DATA_OFFSET + offset] & 0xFF;
+    offset++;
+    return b;
+}
+
+public int read(byte[] b, int off, int len) throws IOException {
+    if (chunk is null) throw new IOException();
+    if (offset is length && !checkChunk()) return -1;
+    len = Math.min(len, length - offset);
+    System.arraycopy(chunk.reference, DATA_OFFSET + offset, b, off, len);
+    offset += len;
+    return len;
+}
+}