Make org.h2.util.ScriptReader throw a better exception when handling broken…

Make org.h2.util.ScriptReader throw a better exception when handling broken scripts which generate extremely large statements.

h2/src/docsrc/html/changelog.html

@@ -74,6 +74,8 @@ Change Log
 </li><li>Make Server#openBrowser respect the $BROWSER environment variable. Add "chromium" to the list of browsers tried.
     Patch from Felix Kaiser.
 </li><li>Fix to org.h2.util.ScriptReader when handling unclosed block comments.
+</li><li>Make org.h2.util.ScriptReader throw a better exception when handling broken scripts which generate
+    extremely large statements.
 </li></ul>
 
 <h2>Version 1.3.173 (2013-07-28)</h2>

h2/src/main/org/h2/util/ScriptReader.java

@@ -237,6 +237,12 @@ public class ScriptReader {
         if (keep > 0) {
             char[] src = buffer;
             if (keep + Constants.IO_BUFFER_SIZE > src.length) {
+                // protect against NegativeArraySizeException
+                if (src.length >= Integer.MAX_VALUE / 2) {
+                    throw new IOException("error in parsing script, statement size exceeds 1G, " +
+                    		"first 80 characters of statement looks like: " +
+                                new String(buffer,bufferStart,80));
+                }
                 buffer = new char[src.length * 2];
             }
             System.arraycopy(src, bufferStart, buffer, 0, keep);