1 files changed, 80 insertions, 0 deletions
diff --git a/libjava/java/util/zip/CheckedInputStream.java b/libjava/java/util/zip/CheckedInputStream.java
new file mode 100644
index 00000000000..a6a9058a5a4
--- /dev/null
+++ b/libjava/java/util/zip/CheckedInputStream.java
@@ -0,0 +1,80 @@
+// CheckedInputStream.java - Compute checksum of data being read.
+
+/* Copyright (C) 1999  Cygnus Solutions
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+package java.util.zip;
+
+import java.io.FilterInputStream;
+import java.io.InputStream;
+import java.io.IOException;
+
+/**
+ * @author Tom Tromey
+ * @date May 17, 1999
+ */
+
+/* Written using on-line Java Platform 1.2 API Specification
+ * and JCL book.
+ * Believed complete and correct.
+ */
+
+public class CheckedInputStream extends FilterInputStream
+{
+  public CheckedInputStream (InputStream in, Checksum sum)
+  {
+    super (in);
+    this.sum = sum;
+  }
+
+  public Checksum getChecksum ()
+  {
+    return sum;
+  }
+
+  public int read () throws IOException
+  {
+    int x = in.read();
+    if (x != -1)
+      sum.update(x);
+    return x;
+  }
+
+  public int read (byte[] buf, int off, int len) throws IOException
+  {
+    int r = in.read(buf, off, len);
+    if (r != -1)
+      sum.update(buf, off, r);
+    return r;
+  }
+
+  public long skip (long n) throws IOException
+  {
+    if (n == 0)
+      return 0;
+
+    int min = (int) Math.min(n, 1024);
+    byte[] buf = new byte[min];
+
+    long s = 0;
+    while (n > 0)
+      {
+	int r = in.read(buf, 0, min);
+	if (r == -1)
+	  break;
+	n -= r;
+	s += r;
+	sum.update(buf, 0, r);
+      }
+
+    return s;
+  }
+
+  // The checksum object.
+  private Checksum sum;
+}