[Boost-users] boost::input_filter and negative char

hello. I've seem to found a strange behavior within boost::input_filter, I'm writing data to a file using bzip2 compressor, in this issue all goes well, now when I read the data (I post process the data after the de/compression) because some of the chars are negative, then cases where there are two sequential -1 causes the filter to end processing even if the file isn't at eof. what can be done to prevent it? should this even happen? here are the test results: http://www.4shared.com/file/233035989/8bde1629/testresults.html