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https://issues.apache.org/jira/browse/LUCENE-3738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196955#comment-13196955
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Uwe Schindler commented on LUCENE-3738:
---------------------------------------
The BufferedIndexInput one has also this bug, only affecting reads at the
boundaries (if the 10 bytes of a full int are no longer in buffer), in that
case it throws AIOOBE:
{code:java}
public long readVLong() throws IOException {
if (9 <= bufferLength-bufferPosition) {
byte b = buffer[bufferPosition++];
long i = b & 0x7F;
for (int shift = 7; (b & 0x80) != 0; shift += 7) {
b = buffer[bufferPosition++];
i |= (b & 0x7FL) << shift;
}
return i;
} else {
return super.readVLong();
}
}
{code}
> Be consistent about negative vInt/vLong
> ---------------------------------------
>
> Key: LUCENE-3738
> URL: https://issues.apache.org/jira/browse/LUCENE-3738
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Michael McCandless
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3738.patch
>
>
> Today, write/readVInt "allows" a negative int, in that it will encode and
> decode correctly, just horribly inefficiently (5 bytes).
> However, read/writeVLong fails (trips an assert).
> I'd prefer that both vInt/vLong trip an assert if you ever try to write a
> negative number... it's badly trappy today. But, unfortunately, we sometimes
> rely on this... had we had this assert in 'since the beginning' we could have
> avoided that.
> So, if we can't add that assert in today, I think we should at least fix
> readVLong to handle negative longs... but then you quietly spend 9 bytes
> (even more trappy!).
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