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/text/BreakIterator/MirroredBreakIterator.java

@@ -0,0 +1,166 @@
+/*
+ * Copyright (c) 2007, 2022, 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.
+ */
+
+import java.text.BreakIterator;
+import java.text.CharacterIterator;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+import java.util.NoSuchElementException;
+
+public class MirroredBreakIterator extends BreakIterator {
+    private final List<Integer> boundaries;
+    private int charIndex;
+    private int boundaryIndex;
+
+    MirroredBreakIterator(BreakIterator bi) {
+        List<Integer> b = new ArrayList<Integer>();
+        int i = bi.first();
+        charIndex = i;
+        for (; i != DONE; i = bi.next()) {
+            b.add(i);
+        }
+        boundaries = Collections.unmodifiableList(b);
+    }
+
+    @Override
+    public Object clone() {
+        try {
+            return super.clone();
+        } catch (Exception e) {
+            throw new RuntimeException("clone failed", e);
+        }
+    }
+
+    @Override
+    public int first() {
+        return changeIndices(0);
+    }
+
+    @Override
+    public int last() {
+        return changeIndices(boundaries.size() - 1);
+    }
+
+    @Override
+    public int next(int n) {
+        if (n == 0) {
+            return current();
+        }
+        int newBoundary = boundaryIndex + n;
+        if (newBoundary < 0) {
+            first();
+            return DONE;
+        }
+        if (newBoundary > lastBoundary()) {
+            last();
+            return DONE;
+        }
+        return changeIndices(newBoundary);
+    }
+
+    @Override
+    public int next() {
+        if (boundaryIndex == lastBoundary()) {
+            return DONE;
+        }
+        return changeIndices(boundaryIndex + 1);
+    }
+
+    @Override
+    public int previous() {
+        if (boundaryIndex == 0) {
+            return DONE;
+        }
+        return changeIndices(boundaryIndex - 1);
+    }
+
+    @Override
+    public int following(int offset) {
+        validateOffset(offset);
+        for (int b = 0; b <= lastBoundary(); b++) {
+            int i = boundaries.get(b);
+            if (i > offset) {
+                return changeIndices(i, b);
+            }
+        }
+        return DONE;
+    }
+
+    @Override
+    public int preceding(int offset) {
+        validateOffset(offset);
+        for (int b = lastBoundary(); b >= 0; b--) {
+            int i = boundaries.get(b);
+            if (i < offset) {
+                return changeIndices(i, b);
+            }
+        }
+        return DONE;
+    }
+
+    @Override
+    public boolean isBoundary(int offset) {
+        // Call the default implementation in BreakIterator
+        return super.isBoundary(offset);
+    }
+
+    @Override
+    public int current() {
+        return charIndex;
+    }
+
+    @Override
+    public CharacterIterator getText() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void setText(CharacterIterator newText) {
+        throw new UnsupportedOperationException();
+    }
+
+    private int lastBoundary() {
+        return boundaries.size() - 1;
+    }
+
+    private int changeIndices(int newCharIndex, int newBoundary) {
+        boundaryIndex = newBoundary;
+        return charIndex = newCharIndex;
+    }
+
+    private int changeIndices(int newBoundary) {
+        try {
+            return changeIndices(boundaries.get(newBoundary), newBoundary);
+        } catch (IndexOutOfBoundsException e) {
+            throw new IllegalArgumentException(e);
+        }
+    }
+
+    private void validateOffset(int offset) {
+        if (offset < boundaries.get(0) || offset > boundaries.get(lastBoundary())) {
+            throw new IllegalArgumentException();
+        }
+    }
+}