undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/jdk/java/rmi/reliability/benchmark/bench/serial/StreamBuffer.java

@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ *
+ */
+
+package bench.serial;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.IOException;
+
+/**
+ * The StreamBuffer class provides a space that can be written to with an
+ * OutputStream and read from with an InputStream.  It is similar to
+ * PipedInput/OutputStream except that it is unsynchronized and more
+ * lightweight.  StreamBuffers are used inside of the serialization benchmarks
+ * in order to minimize the overhead incurred by reading and writing to/from the
+ * underlying stream (using ByteArrayInput/OutputStreams results in allocation
+ * of a new byte array with each cycle, while using PipedInput/OutputStreams
+ * involves threading and synchronization).
+ * <p>
+ * Writes/reads to and from a StreamBuffer must occur in distinct phases; reads
+ * from a StreamBuffer effectively close the StreamBuffer output stream.  These
+ * semantics are necessary to avoid using wait/notify in
+ * StreamBufferInputStream.read().
+ */
+public class StreamBuffer {
+
+    /**
+     * Output stream for writing to stream buffer.
+     */
+    private class StreamBufferOutputStream extends OutputStream {
+
+        private int pos;
+
+        public void write(int b) throws IOException {
+            if (mode != WRITE_MODE)
+                throw new IOException();
+            while (pos >= buf.length)
+                grow();
+            buf[pos++] = (byte) b;
+        }
+
+        public void write(byte[] b, int off, int len) throws IOException {
+            if (mode != WRITE_MODE)
+                throw new IOException();
+            while (pos + len > buf.length)
+                grow();
+            System.arraycopy(b, off, buf, pos, len);
+            pos += len;
+        }
+
+        public void close() throws IOException {
+            if (mode != WRITE_MODE)
+                throw new IOException();
+            mode = READ_MODE;
+        }
+    }
+
+    /**
+     * Input stream for reading from stream buffer.
+     */
+    private class StreamBufferInputStream extends InputStream {
+
+        private int pos;
+
+        public int read() throws IOException {
+            if (mode == CLOSED_MODE)
+                throw new IOException();
+            mode = READ_MODE;
+            return (pos < out.pos) ? (buf[pos++] & 0xFF) : -1;
+        }
+
+        public int read(byte[] b, int off, int len) throws IOException {
+            if (mode == CLOSED_MODE)
+                throw new IOException();
+            mode = READ_MODE;
+            int avail = out.pos - pos;
+            int rlen = (avail < len) ? avail : len;
+            System.arraycopy(buf, pos, b, off, rlen);
+            pos += rlen;
+            return rlen;
+        }
+
+        public long skip(long len) throws IOException {
+            if (mode == CLOSED_MODE)
+                throw new IOException();
+            mode = READ_MODE;
+            int avail = out.pos - pos;
+            long slen = (avail < len) ? avail : len;
+            pos += slen;
+            return slen;
+        }
+
+        public int available() throws IOException {
+            if (mode == CLOSED_MODE)
+                throw new IOException();
+            mode = READ_MODE;
+            return out.pos - pos;
+        }
+
+        public void close() throws IOException {
+            if (mode == CLOSED_MODE)
+                throw new IOException();
+            mode = CLOSED_MODE;
+        }
+    }
+
+    private static final int START_BUFSIZE = 256;
+    private static final int GROW_FACTOR = 2;
+    private static final int CLOSED_MODE = 0;
+    private static final int WRITE_MODE = 1;
+    private static final int READ_MODE = 2;
+
+    private byte[] buf;
+    private StreamBufferOutputStream out = new StreamBufferOutputStream();
+    private StreamBufferInputStream in = new StreamBufferInputStream();
+    private int mode = WRITE_MODE;
+
+    public StreamBuffer() {
+        this(START_BUFSIZE);
+    }
+
+    public StreamBuffer(int size) {
+        buf = new byte[size];
+    }
+
+    public OutputStream getOutputStream() {
+        return out;
+    }
+
+    public InputStream getInputStream() {
+        return in;
+    }
+
+    public void reset() {
+        in.pos = out.pos = 0;
+        mode = WRITE_MODE;
+    }
+
+    private void grow() {
+        byte[] newbuf = new byte[buf.length * GROW_FACTOR];
+        System.arraycopy(buf, 0, newbuf, 0, buf.length);
+        buf = newbuf;
+    }
+}