8306623: (bf) CharBuffer::allocate throws unexpected exception type with some CharSequences

Reviewed-by: alanb, lancea

Author: Brian Burkhalter

src/java.base/share/classes/java/nio/X-Buffer.java.template

@@ -2045,8 +2045,17 @@ public abstract sealed class $Type$Buffer
      */
     public $Type$Buffer append(CharSequence csq, int start, int end) {
         if (csq instanceof CharBuffer cb) {
-            int pos = position();
+            //
+            // the append method throws BufferOverflowException when
+            // there is insufficient space in the buffer
+            //
             int length = end - start;
+            int pos = position();
+            int lim = limit();
+            int rem = (pos <= lim) ? lim - pos : 0;
+            if (length > rem)
+                throw new BufferOverflowException();
+
             put(pos, cb, start, length);
             position(pos + length);
             return this;

test/jdk/java/nio/Buffer/Basic-X.java.template

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2023, 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
@@ -627,6 +627,36 @@ public class Basic$Type$
         absBulkGet(b);
 
 #if[char]
+        // 8306623
+        String str = "in violet night walking beneath a reign of uncouth stars";
+        char[] chars = str.toCharArray();
+        int cslen = chars.length;
+        CharSequence[] csqs = new CharSequence[] {
+            str,
+            new StringBuffer(str),
+            new StringBuilder(str),
+            CharBuffer.wrap(chars),
+            ByteBuffer.allocateDirect(2*chars.length).asCharBuffer()
+        };
+
+        int[][] bounds = new int[][] {
+            {-1, cslen},         // negative start
+            {0, -1},             // negative end
+            {1, 0},              // start > end
+            {cslen/2, cslen + 1} // end > cslen
+        };
+
+        for (CharSequence csq : csqs) {
+            // append() should throw BufferOverflowException
+            tryCatch(b, BufferOverflowException.class, () ->
+                CharBuffer.allocate(cslen/8).append(csq, cslen/4, cslen/2));
+
+            // append() should throw IndexOutOfBoundsException
+            for (int[] bds : bounds)
+                tryCatch(b, IndexOutOfBoundsException.class, () ->
+                    CharBuffer.allocate(cslen + 1).append(csq, bds[0], bds[1]));
+        }
+        // end 8306623
 
         bulkPutString(b);
         relGet(b);

test/jdk/java/nio/Buffer/Basic.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2023, 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
@@ -26,7 +26,7 @@
  * @bug 4413135 4414911 4416536 4416562 4418782 4471053 4472779 4490253 4523725
  *      4526177 4463011 4660660 4661219 4663521 4782970 4804304 4938424 5029431
  *      5071718 6231529 6221101 6234263 6535542 6591971 6593946 6795561 7190219
- *      7199551 8065556 8149469 8230665 8237514
+ *      7199551 8065556 8149469 8230665 8237514 8306623
  * @modules java.base/java.nio:open
  *          java.base/jdk.internal.misc
  * @author Mark Reinhold

test/jdk/java/nio/Buffer/BasicChar.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2023, 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
@@ -627,6 +627,36 @@ public static void test(int level, final CharBuffer b, boolean direct) {
         absBulkGet(b);
 
 
+        // 8306623
+        String str = "in violet night walking beneath a reign of uncouth stars";
+        char[] chars = str.toCharArray();
+        int cslen = chars.length;
+        CharSequence[] csqs = new CharSequence[] {
+            str,
+            new StringBuffer(str),
+            new StringBuilder(str),
+            CharBuffer.wrap(chars),
+            ByteBuffer.allocateDirect(2*chars.length).asCharBuffer()
+        };
+
+        int[][] bounds = new int[][] {
+            {-1, cslen},         // negative start
+            {0, -1},             // negative end
+            {1, 0},              // start > end
+            {cslen/2, cslen + 1} // end > cslen
+        };
+
+        for (CharSequence csq : csqs) {
+            // append() should throw BufferOverflowException
+            tryCatch(b, BufferOverflowException.class, () ->
+                CharBuffer.allocate(cslen/8).append(csq, cslen/4, cslen/2));
+
+            // append() should throw IndexOutOfBoundsException
+            for (int[] bds : bounds)
+                tryCatch(b, IndexOutOfBoundsException.class, () ->
+                    CharBuffer.allocate(cslen + 1).append(csq, bds[0], bds[1]));
+        }
+        // end 8306623
 
         bulkPutString(b);
         relGet(b);