AMDG On 10/19/2010 5:29 AM, Bryan wrote:
I'm using Boost 1.43 and I've run across a situation where I'm getting unexpected results when reading the uncompressed stream. I originally thought that it was an issue with my data format interpretation, but it turns out that something seems to be consuming a character from the input stream. Here's a sample of reading the stream a character at a time: cur = 80, next = 80 cur = 80, next = 38 cur = 38, next = 8c cur = 8c, next = c cur = b4, next = db <--- Cur != previous next cur = db, next = 1 cur = 1, next = 1 cur = 1, next = dd
This debugging output shows the discontinuity in the stream. The code is pretty simple:
boost::iostreams::filtering_istream instream; std::fstream infile; uint8_t d; instream.push(boost::iostreams::bzip2_decompressor()); infile.open("file.bz2", std::ios::binary|std::ios::in); instream.push(infile);
while (true){ instream >> d; fprintf(stderr, "cur = %x, next = %x\n", d, instream.peek()); }
Reading a large chunk of data from the stream via read() does not have the same issue.
I see that there are a few changes for compression in 1.44 [Fix several issues with compression and decompression (#2318, #4091, #3348, #2783, #1579, #3853). ] but it's unclear if this is one of them.
This looks like a serious problem. Can you file a trac ticket at http://svn.boost.org, including a complete test case? In Christ, Steven Watanabe