// Token: 0x06003410 RID: 13328 RVA: 0x00148C28 File Offset: 0x00146E28
private static MidiChunk ReadChunk(MidiReader reader, ReadingSettings settings, int actualTrackChunksCount, int?expectedTrackChunksCount)
{
MidiChunk midiChunk = null;
try
{
string text = reader.ReadString(4);
if (text.Length < 4)
{
NotEnoughBytesPolicy notEnoughBytesPolicy = settings.NotEnoughBytesPolicy;
if (notEnoughBytesPolicy == NotEnoughBytesPolicy.Abort)
{
throw new NotEnoughBytesException("Chunk ID cannot be read since the reader's underlying stream doesn't have enough bytes.", 4L, (long)text.Length);
}
if (notEnoughBytesPolicy == NotEnoughBytesPolicy.Ignore)
{
return(null);
}
}
if (!(text == "MThd"))
{
if (!(text == "MTrk"))
{
midiChunk = MidiFile.TryCreateChunk(text, settings.CustomChunkTypes);
}
else
{
midiChunk = new TrackChunk();
}
}
else
{
midiChunk = new HeaderChunk();
}
if (midiChunk == null)
{
switch (settings.UnknownChunkIdPolicy)
{
case UnknownChunkIdPolicy.ReadAsUnknownChunk:
midiChunk = new UnknownChunk(text);
break;
case UnknownChunkIdPolicy.Skip:
{
uint num = reader.ReadDword();
reader.Position += (long)((ulong)num);
return(null);
}
case UnknownChunkIdPolicy.Abort:
throw new UnknownChunkException("'" + text + "' chunk ID is unknown.", text);
}
}
if (midiChunk is TrackChunk && expectedTrackChunksCount != null)
{
int?num2 = expectedTrackChunksCount;
if (actualTrackChunksCount >= num2.GetValueOrDefault() & num2 != null)
{
MidiFile.ReactOnUnexpectedTrackChunksCount(settings.UnexpectedTrackChunksCountPolicy, actualTrackChunksCount, expectedTrackChunksCount.Value);
ExtraTrackChunkPolicy extraTrackChunkPolicy = settings.ExtraTrackChunkPolicy;
if (extraTrackChunkPolicy != ExtraTrackChunkPolicy.Read && extraTrackChunkPolicy == ExtraTrackChunkPolicy.Skip)
{
uint num3 = reader.ReadDword();
reader.Position += (long)((ulong)num3);
return(null);
}
}
}
midiChunk.Read(reader, settings);
}
catch (NotEnoughBytesException exception)
{
MidiFile.ReactOnNotEnoughBytes(settings.NotEnoughBytesPolicy, exception);
}
catch (EndOfStreamException exception2)
{
MidiFile.ReactOnNotEnoughBytes(settings.NotEnoughBytesPolicy, exception2);
}
return(midiChunk);
}
/// <summary>
/// Reads a chunk from a MIDI-file.
/// </summary>
/// <param name="reader">Reader to read a chunk with.</param>
/// <param name="settings">Settings according to which a chunk must be read.</param>
/// <param name="actualTrackChunksCount">Actual count of track chunks at the moment.</param>
/// <param name="expectedTrackChunksCount">Expected count of track chunks.</param>
/// <returns>A MIDI-file chunk.</returns>
/// <exception cref="ObjectDisposedException">Method was called after the reader was disposed.</exception>
/// <exception cref="IOException">An I/O error occurred on the underlying stream.</exception>
/// <exception cref="UnknownChunkException">Chunk to be read has unknown ID and that
/// should be treated as error accordng to the specified <paramref name="settings"/>.</exception>
/// <exception cref="UnexpectedTrackChunksCountException">Actual track chunks
/// count is greater than expected one and that should be treated as error according to
/// the specified <paramref name="settings"/>.</exception>
/// <exception cref="InvalidChunkSizeException">Actual chunk's size differs from the one declared
/// in its header and that should be treated as error according to the specified
/// <paramref name="settings"/>.</exception>
/// <exception cref="UnknownChannelEventException">Reader has encountered an unknown channel event.</exception>
/// <exception cref="NotEnoughBytesException">Value cannot be read since the reader's underlying stream
/// doesn't have enough bytes.</exception>
/// <exception cref="UnexpectedRunningStatusException">Unexpected running status is encountered.</exception>
/// <exception cref="MissedEndOfTrackEventException">Track chunk doesn't end with End Of Track event and that
/// should be treated as error accordng to the specified <paramref name="settings"/>.</exception>
/// <exception cref="InvalidChannelEventParameterValueException">Value of a channel event's parameter
/// just read is invalid.</exception>
/// <exception cref="InvalidMetaEventParameterValueException">Value of a meta event's parameter
/// just read is invalid.</exception>
private static MidiChunk ReadChunk(MidiReader reader, ReadingSettings settings, int actualTrackChunksCount, int?expectedTrackChunksCount)
{
MidiChunk chunk = null;
try
{
var chunkId = reader.ReadString(MidiChunk.IdLength);
if (chunkId.Length < MidiChunk.IdLength)
{
switch (settings.NotEnoughBytesPolicy)
{
case NotEnoughBytesPolicy.Abort:
throw new NotEnoughBytesException("Chunk ID cannot be read since the reader's underlying stream doesn't have enough bytes.",
MidiChunk.IdLength,
chunkId.Length);
case NotEnoughBytesPolicy.Ignore:
return(null);
}
}
//
switch (chunkId)
{
case HeaderChunk.Id:
chunk = new HeaderChunk();
break;
case TrackChunk.Id:
chunk = new TrackChunk();
break;
default:
chunk = TryCreateChunk(chunkId, settings.CustomChunkTypes);
break;
}
//
if (chunk == null)
{
switch (settings.UnknownChunkIdPolicy)
{
case UnknownChunkIdPolicy.ReadAsUnknownChunk:
chunk = new UnknownChunk(chunkId);
break;
case UnknownChunkIdPolicy.Skip:
var size = reader.ReadDword();
reader.Position += size;
return(null);
case UnknownChunkIdPolicy.Abort:
throw new UnknownChunkException($"'{chunkId}' chunk ID is unknown.", chunkId);
}
}
//
if (chunk is TrackChunk && expectedTrackChunksCount != null && actualTrackChunksCount >= expectedTrackChunksCount)
{
ReactOnUnexpectedTrackChunksCount(settings.UnexpectedTrackChunksCountPolicy, actualTrackChunksCount, expectedTrackChunksCount.Value);
switch (settings.ExtraTrackChunkPolicy)
{
case ExtraTrackChunkPolicy.Read:
break;
case ExtraTrackChunkPolicy.Skip:
var size = reader.ReadDword();
reader.Position += size;
return(null);
}
}
//
chunk.Read(reader, settings);
}
catch (NotEnoughBytesException ex)
{
ReactOnNotEnoughBytes(settings.NotEnoughBytesPolicy, ex);
}
catch (EndOfStreamException ex)
{
ReactOnNotEnoughBytes(settings.NotEnoughBytesPolicy, ex);
}
return(chunk);
}
