re PR libgcj/36252 (OutOfMemoryError on simple text conversion.)

2008-05-20  David Daney  <ddaney@avtrex.com>

	PR libgcj/36252
	* java/lang/natString.ccn: Add
	#include <java/io/CharConversionException.h>.
	(init (byte[], int, int, String)): Catch and ignore
	CharConversionException.  Break out of conversion loop
	on incomplete input.
	* testsuite/libjava.lang/PR36252.java: New test.
	* testsuite/libjava.lang/PR36252.out: New file, its expected output.
	* testsuite/libjava.lang/PR36252.jar: New file, its pre-compiled
	jar file.

From-SVN: r135705

libjava/ChangeLog

+2008-05-20  David Daney  <ddaney@avtrex.com>
+
+	PR libgcj/36252
+	* java/lang/natString.ccn: Add
+	#include <java/io/CharConversionException.h>.
+	(init (byte[], int, int, String)): Catch and ignore
+	CharConversionException.  Break out of conversion loop
+	on incomplete input.
+	* testsuite/libjava.lang/PR36252.java: New test.
+	* testsuite/libjava.lang/PR36252.out: New file, its expected output.
+	* testsuite/libjava.lang/PR36252.jar: New file, its pre-compiled
+	jar file.
+
 2008-04-19  Tom Tromey  <tromey@redhat.com>
 
 	PR libgcj/35979:

libjava/java/lang/natString.cc

 // natString.cc - Implementation of java.lang.String native methods.
 
-/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007  Free Software Foundation
+/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
+   2007, 2008  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -23,6 +24,7 @@ details.  */
 #include <java/lang/NullPointerException.h>
 #include <java/lang/StringBuffer.h>
 #include <java/io/ByteArrayOutputStream.h>
+#include <java/io/CharConversionException.h>
 #include <java/io/OutputStreamWriter.h>
 #include <java/io/ByteArrayInputStream.h>
 #include <java/io/InputStreamReader.h>
@@ -493,9 +495,28 @@ java::lang::String::init (jbyteArray bytes, jint offset, jint count,
   converter->setInput(bytes, offset, offset+count);
   while (converter->inpos < converter->inlength)
     {
-      int done = converter->read(array, outpos, avail);
+      int done;
+      try
+	{
+	  done = converter->read(array, outpos, avail);
+	}
+      catch (::java::io::CharConversionException *e)
+	{
+	  // Ignore it and silently throw away the offending data.
+	  break;
+	}
       if (done == 0)
 	{
+	  // done is zero if either there is no space available in the
+	  // output *or* the input is incomplete.  We assume that if
+	  // there are 20 characters available in the output, the
+	  // input must be incomplete and there is no more work to do.
+	  // This means we may skip several bytes of input, but that
+	  // is OK as the behavior is explicitly unspecified in this
+	  // case.
+	  if (avail - outpos > 20)
+	    break;
+
 	  jint new_size = 2 * (outpos + avail);
 	  jcharArray new_array = JvNewCharArray (new_size);
 	  memcpy (elements (new_array), elements (array),

libjava/testsuite/libjava.lang/PR36252.java

+import java.io.UnsupportedEncodingException;
+
+public class PR36252
+{
+  public static void main(String[] args)
+  {
+    try {
+      byte[] txt = new byte[] {-55, 87, -55, -42, -55, -20};
+      // This new String(...) should not throw an OutOfMemoryError.
+      String s = new String(txt, 0, 6, "MS932");
+    } catch (UnsupportedEncodingException e) {
+      // Silently ignore.
+    }
+    System.out.println("ok");
+  }
+}

libjava/testsuite/libjava.lang/PR36252.out

+ok