public void AppendSource(IConcatStreamSource source, bool optimizeIfPossible = true)
{
if (disposed)
{
throw new ObjectDisposedException(nameof(ConcatStream));
}
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
lock (sources)
{
// CanSeek = first source valid, every other source must be 0 or Length unless it's sourceIndex. Doesn't optimize
// Can(not)Seek = always valid, does optimization
// If reading and seeking have already occured, don't allow appending seekable sources, otherwise internal state can be messed up
var priorCanSeek = CanSeek;
if (source.CanSeek)
{
if (priorCanSeek && (HasFlags(PropertyFlags.EventSeekingOccured) || HasFlags(PropertyFlags.EventReadingOccured)))
{
throw new InvalidOperationException("Cannot append a seekable source to a seekable stream if reading or seeking has already occured");
}
}
var currentMeasuredIndexPosition = -1;
if (priorCanSeek)
{
currentMeasuredIndexPosition = GetIndexPosition();
if (source.CanSeek && sources.Count != 0 &&
source.Position != 0 && source.Position != source.Length &&
currentMeasuredIndexPosition != sources.Count)
{
throw new ArgumentException("Invalid seekable source");
}
}
ReplaceFlags(PropertyFlags.DirtyMask, PropertyFlags.DirtyAll);
sources.Add(source);
if (priorCanSeek && (sources.Count > 1 || source.CanSeek))
{
sourceIndex = Math.Min(sources.Count - 1, currentMeasuredIndexPosition);
absPos = 0;
for (int i = 0; i <= sourceIndex; i++)
{
absPos += sources[i].Position;
}
}
if (!source.CanSeek && optimizeIfPossible)
{
OptimizeSources();
}
}
}
public void Setup()
{
concatStreamSourceData = Substitute.For <IConcatStreamSource>();
concatStreamSourceDataUsed = Substitute.For <IConcatStreamSource>();
concatStreamSourceNoData = Substitute.For <IConcatStreamSource>();
concatStreamSourceData.Position.Returns(0);
concatStreamSourceData.Length.Returns(StreamSourceDefaultLength);
concatStreamSourceData.CanSeek.Returns(true);
concatStreamSourceDataUsed.Position.Returns(StreamSourceDefaultLength);
concatStreamSourceDataUsed.Length.Returns(StreamSourceDefaultLength);
concatStreamSourceDataUsed.CanSeek.Returns(true);
concatStreamSourceNoData.Position.Returns(0);
concatStreamSourceNoData.Length.Returns(0);
concatStreamSourceNoData.CanSeek.Returns(true);
}
