private static Entry ReadEntryStream(RepositoryReader reader, string hash, Stream stream, Stream entryStream, long offset, ObjectType type, long length, Func <Stream> streamProvider)
{
switch (type)
{
case ObjectType.Commit:
return(CommitReader.Read(reader, hash, entryStream));
case ObjectType.Tree:
return(TreeReader.Read(reader, hash, entryStream, length));
case ObjectType.Blob:
return(BlobReader.Read(reader, hash, entryStream, streamProvider));
case ObjectType.OfsDelta:
var(undeltifiedData, undeltifiedLength, baseType) = OfsDeltaReader.Read(
stream, offset, length,
(off, len, pool) => ReadEntryData(reader, hash, stream, off, isNestedDelta: true),
isNestedDelta: false);
using (var undeltifiedStream = new MemoryStream(undeltifiedData))
{
return(ReadEntryStream(reader, hash, stream, undeltifiedStream, 0L, baseType, undeltifiedLength, streamProvider));
}
default:
throw new NotImplementedException();
}
}
private static (byte[] Data, ObjectType Type) ReadEntryData(RepositoryReader reader, string hash, Stream stream, long offset, bool isNestedDelta)
{
var(type, length) = ReadEntryInformation(stream, offset);
byte[] result;
switch (type)
{
case ObjectType.Commit:
case ObjectType.Tree:
using (var deflateStream = stream.DeflateForZlibData())
{
result = isNestedDelta ? OfsDeltaReader._arrayPool.Rent((int)length) : new byte[length];
deflateStream.Read(result, 0, (int)length);
}
break;
case ObjectType.Blob:
result = isNestedDelta ? OfsDeltaReader._arrayPool.Rent((int)length) : new byte[length];
stream.Read(result, 0, (int)length);
break;
case ObjectType.OfsDelta:
(result, _, type) = OfsDeltaReader.Read(stream, offset, length,
(off, len, pool) => ReadEntryData(reader, hash, stream, off, isNestedDelta), isNestedDelta);
break;
default:
throw new NotImplementedException();
}
return(result, type);
}