1 files changed, 125 insertions, 0 deletions
diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/impl/input/DelimitedInputStream.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/impl/input/DelimitedInputStream.java
new file mode 100644
index 0000000..f10b546
--- /dev/null
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/impl/input/DelimitedInputStream.java
@@ -0,0 +1,125 @@
+/**
+ * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
+ * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a
+ * joint initiative of the Federal Chancellery Austria and Graz University of
+ * Technology.
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://www.osor.eu/eupl/
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ *
+ * This product combines work with different licenses. See the "NOTICE" text
+ * file for details on the various modules and licenses.
+ * The "NOTICE" text file is part of the distribution. Any derivative works
+ * that you distribute must include a readable copy of the "NOTICE" text file.
+ */
+package at.gv.egiz.pdfas.impl.input;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * An input stream that has a delimited length.
+ * 
+ * @author wprinz
+ */
+public class DelimitedInputStream extends InputStream
+{
+  /**
+   * The underlying InputStream.
+   */
+  protected InputStream is = null;
+
+  /**
+   * The number of bytes that can be read from the stream.
+   */
+  protected int bytes_to_read = -1;
+
+  /**
+   * Constructs the DelimitedInputStream from which a maximum of length bytes
+   * can be read.
+   */
+  public DelimitedInputStream(InputStream is, int length)
+  {
+    this.is = is;
+    this.bytes_to_read = length;
+  }
+
+  /**
+   * @see java.io.InputStream#read()
+   */
+  public int read() throws IOException
+  {
+    if (this.bytes_to_read <= 0)
+    {
+      return -1;
+    }
+    int read = this.is.read();
+    if (read > 0)
+    {
+      this.bytes_to_read--;
+    }
+    return read;
+  }
+
+  /**
+   * @see java.io.InputStream#read(byte[], int, int)
+   */
+  public int read(byte[] b, int off, int len) throws IOException
+  {
+    int btr = Math.min(len, this.bytes_to_read);
+    int read = this.is.read(b, off, btr);
+    if (read > 0)
+    {
+      this.bytes_to_read -= read;
+    }
+    return read;
+  }
+
+  /**
+   * @see java.io.InputStream#read(byte[])
+   */
+  public int read(byte[] b) throws IOException
+  {
+    return read(b, 0, b.length);
+  }
+
+  /**
+   * @see java.io.InputStream#skip(long)
+   */
+  public long skip(long n) throws IOException
+  {
+    long bts = Math.min(n, this.bytes_to_read);
+    long skipped = this.is.skip(bts);
+    if (skipped > 0)
+    {
+      this.bytes_to_read -= skipped;
+    }
+    return skipped;
+  }
+
+  /**
+   * @see java.io.InputStream#close()
+   */
+  public void close() throws IOException
+  {
+    this.is.close();
+  }
+
+  /**
+   * @see java.io.InputStream#available()
+   */
+  public int available() throws IOException
+  {
+    int avail = this.is.available();
+    return Math.min(this.bytes_to_read, avail);
+  }
+}