public Result <int, ErrorCodes?> Compress([NotNull] Stream inputStream, [NotNull] Stream outputStream)
{
if (inputStream == null)
{
throw new ArgumentNullException(nameof(inputStream));
}
if (outputStream == null)
{
throw new ArgumentNullException(nameof(outputStream));
}
if (inputStream.Position == inputStream.Length)
{
return(ErrorCodes.NothingToCompress);
}
using (var workersPool = new WorkersPool.WorkersPool(settings.ThreadsCount, log))
using (var tasksQueue = new BlockingTasksQueue(settings.CompressingQueueSize, workersPool, log))
{
var outputFile = new OutputFile(outputStream, settings.OffsetLabel);
var(lastReadOffset, offsetError) = outputFile.GetLastOffset();
if (offsetError.HasValue)
{
return(offsetError);
}
var compressInputFileTask = RunEnqueueingInputFileBlockCompression(inputStream, lastReadOffset, tasksQueue);
workersPool.PushTask(compressInputFileTask);
foreach (var result in tasksQueue.ConsumeTaskResults())
{
if (result.IsFailed)
{
if (result.Exception is CompressorException fileSystemException)
{
return(fileSystemException.Error);
}
throw result.Exception;
}
var resultBlock = (Block)result.Result;
outputFile.Append(resultBlock.Bytes, resultBlock.Offset);
}
var commitError = outputFile.Commit();
if (commitError.HasValue)
{
return(commitError);
}
return(outputFile.CompressionRatio(inputStream.Length));
}
}
public void Should_fail_when_given_negative_offset()
{
Action action = () => outputFile.Append(bytes, -1);
action.Should().Throw <ArgumentException>();
}