[jira] [Updated] (IO-302) ArrayIndexOutOfBoundsException in BOMInputStream when reading a file without BOM multiple times

["Jan Steuerwald (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IO-302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jan Steuerwald updated IO-302:
------------------------------

    Attachment: testfileNoBOM.xml
                testfileBOM.xml
    
> ArrayIndexOutOfBoundsException in BOMInputStream when reading a file without BOM multiple times
> -----------------------------------------------------------------------------------------------
>
>                 Key: IO-302
>                 URL: https://issues.apache.org/jira/browse/IO-302
>             Project: Commons IO
>          Issue Type: Bug
>          Components: Streams/Writers
>    Affects Versions: 2.1
>         Environment: Win7 64bit, Java 6 32bit
>            Reporter: Jan Steuerwald
>         Attachments: Test.java, testfileBOM.xml, testfileNoBOM.xml
>
>
> Resetting the BOMInputStream doesn't reset the _fbLength_ member variable. This causes _fbLength_ to grow bigger than the _firstBytes_ array (when the file doesn't contain a BOM), which leads to an ArrayIndexOutOfBoundsException in the _readFirstBytes_ method.
> The following test code reveals the problem:
> {code:title=Test.java}
> import java.io.InputStream;
> import org.apache.commons.io.input.BOMInputStream;
> public class Test {
> 	public static void main(String[] args) {
> 		try {
> 			// read the file with BOM twice - works
> 			readFile("testfileWithBOM.xml");
> 			// read the file without BOM twice - crashes
> 			readFile("testfileWithoutBOM.xml");
> 		} catch (Exception e) {
> 			e.printStackTrace();
> 		}
> 	}
> 	private static void readFile(String testFile) throws Exception {
> 		InputStream inputStream = Test.class.getClassLoader().getResourceAsStream(testFile);
> 		BOMInputStream bomStream = new BOMInputStream(inputStream);
> 		bomStream.mark(1000000);
> 		// read for the first time => ok
> 		int bytes = 0;
> 		byte[] bytesFromStream = new byte[100];
> 		do {
> 			bytes = bomStream.read(bytesFromStream);
> 		} while (bytes > 0);
> 		// reset and read a second time => crashes when file has no BOM
> 		bomStream.reset();
> 		do {
> 			bytes = bomStream.read(bytesFromStream);
> 		} while (bytes > 0);
> 	}
> }
> {code}

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