[DIRMINA-1181] Exception thrown when attempting to decode certain UTF-16 chars

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.6
• Fix Version/s: 2.2.4, 2.0.26, 2.1.9
• Component/s: Core
• Environment: Linux, Windows, Java 8, Java 17
• Assignee: Unassigned
• Reporter: Pete Disdale
• Created: 24/Sep/24 10:31
• Updated: 16/Oct/24 13:47
• Resolved: 16/Oct/24 10:16

Description

When trying to decode a UTF16BE input stream containing characters ot the form \uxx00, for example \u0100 (capital A with macron) the method AbstractIoBuffer.getString(CharsetDecoder) incorrectly interprets the second byte as a null terminator (causing a java.nio.charset.MalformedInputException to be thrown) despite this null byte being mid-character (at an odd index). The attached file, MacronTest, demonstrates the issue and when run produces the following output:

buf = ABC
Exception in thread "main" java.nio.charset.MalformedInputException: Input length = 1
    at java.base/java.nio.charset.CoderResult.throwException(CoderResult.java:274)
    at org.apache.mina.core.buffer.AbstractIoBuffer.getString(AbstractIoBuffer.java:1669)
    at MacronTest.<init>(MacronTest.java:61)
    at MacronTest.main(MacronTest.java:13)

It looks like this issue is also in the 2.2.X branch (3.X/trunk not checked).