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https://issues.apache.org/jira/browse/DIRMINA-1181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17885567#comment-17885567
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Thomas Wolf commented on DIRMINA-1181:
--------------------------------------
[~elecharny] : the limit is the index _beyond_ the last valid byte. So one
should not read {{{}get(limit()){}}}. The code as checked in does. If
{{{}limit() == capacity(){}}}, you'll even get an exception.
But as I've stated this several times now without having made myself clear,
here's a simple JUnit test (for the 2.0.X branch; put it in {{{}MacronTest{}}}.
I don't see the fix in 2.2.X yet):
{code:java}
@Test
public void testNotZeroTerminatedUtf16String() throws CharacterCodingException {
IoBuffer buf = IoBuffer.allocate(2);
buf.put((byte) 0x01);
buf.put((byte) 0x00);
buf.position(0);
String decoded = buf.getString(StandardCharsets.UTF_16BE.newDecoder());
assertEquals("Ā", decoded);
}{code}
This will fail with
{code:java}
java.lang.IndexOutOfBoundsException
at java.nio.Buffer.checkIndex(Buffer.java:545)
at java.nio.HeapByteBuffer.get(HeapByteBuffer.java:142)
at
org.apache.mina.core.buffer.AbstractIoBuffer.get(AbstractIoBuffer.java:608)
at
org.apache.mina.core.buffer.AbstractIoBuffer.getString(AbstractIoBuffer.java:1607)
at
org.apache.mina.core.buffer.MacronTest.testNotZeroTerminatedUtf16String(MacronTest.java:88)
...{code}
Using my proposal from above; the test succeeds.
> Exception thrown when attempting to decode certain UTF16 chars
> --------------------------------------------------------------
>
> Key: DIRMINA-1181
> URL: https://issues.apache.org/jira/browse/DIRMINA-1181
> Project: MINA
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.1.6
> Environment: Linux, Windows, Java 8, Java 17
> Reporter: Pete Disdale
> Priority: Major
> Attachments: MacronTest-1.java, MacronTest.java
>
>
> 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).
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