// This ctor is private - no validation is done here. This is to allow the use
// of a (specific) negative value for the _lengthLimit, to indicate that there
// is no length set. So we validate the length limit in those ctors that use an
// explicit param, otherwise we don't validate, because it could be our special
// value.
private CrcCalculatorStream(bool leaveOpen, Int64 length, System.IO.Stream stream)
: base()
{
_innerStream = stream;
_Crc32 = new CRC32();
_lengthLimit = length;
_leaveOpen = leaveOpen;
}
private void _DeflateOne(Object wi)
{
WorkItem workitem = (WorkItem) wi;
try
{
// compress one buffer
int myItem = workitem.index;
lock(workitem)
{
if (workitem.status != (int)WorkItem.Status.Filled)
throw new InvalidOperationException();
PMDCP.Compression.Zlib.CRC32 crc = new CRC32();
// use the workitem:
// calc CRC on the buffer
crc.SlurpBlock(workitem.buffer, 0, workitem.inputBytesAvailable);
// deflate it
DeflateOneSegment(workitem);
// update status
workitem.status = (int)WorkItem.Status.Compressed;
workitem.crc = crc.Crc32Result;
TraceOutput(TraceBits.Compress,
"Compress wi({0}) stat({1}) len({2})",
workitem.index,
workitem.status,
workitem.compressedBytesAvailable
);
// release the item
Monitor.Pulse(workitem);
}
}
catch (System.Exception exc1)
{
lock(_eLock)
{
// expose the exception to the main thread
if (_pendingException!=null)
_pendingException = exc1;
}
}
}