[IO-679] input.AbstractCharacterFilterReader passes count of chars read to filter, not the filter char

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7
• Fix Version/s: 2.8.0
• Component/s: Streams/Writers
• Assignee: Unassigned
• Reporter: Proneel Guptan
• Created: 29/Jul/20 16:42
• Updated: 30/Jul/20 07:36
• Resolved: 29/Jul/20 19:32

Description

 Ran into a bug with AbstractCharacterFilterReader where I noticed that my filter was not receiving the actual characters, but was instead receiving an int value corresponding to the number of chars in my input stream buffer.

I looked at the source file and realized that on line 64:
if (filter(read)) {
should have been:

if (filter(cbuf[readPos])) {

'read` has the number of chars read from the source reader, not the code point of the character read.

I have attached a sample program that illustrates the issue.

I can work on a patch and submit it when done. I will add a test case in the patch.