Excessive memory consumption when scanning large MS-CAB files

[Zopolis4]

When attempting to scan large MS-CAB files, an excessive amount of memory is consumed, appearing to be more than double the size of the file.

To demonstrate, this is what happens when I try and run ProtectionScan on Content1.cab and providing it with 2GB of memory. (If I do not cap it like this, the high memory consumption results in my computer being unresponsive and I have to reboot)

$ sudo systemd-run --scope -p MemoryMax=2000M /tmp/ProtectionScan -d Content1.cab
Running as unit: run-ree8d5917c911412094017ea6a37891d7.scope; invocation ID: 30aa8b43f21d442db81b2cbb4a8167a5
0.00%:  - 
0.00%: Content1.cab - Checking file
System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.
   at System.IO.MemoryStream.set_Capacity(Int32 value)
   at System.IO.MemoryStream.EnsureCapacity(Int32 value)
   at SabreTools.Compression.MSZIP.Decompressor.CopyTo(Stream source, Stream dest)
   at BinaryObjectScanner.FileType.MicrosoftCAB.Extract(Stream stream, String file, String outDir, Boolean includeDebug)
Time elapsed: 00:00:11.3040508
100.00%: Content1.cab - 

For context, Content1.cab is 878 MB.

This issue has resulted in me being unable to dump multiple discs (http://redump.org/disc/49677/, for example) with protection scanning enabled, as it consumes all the available memory and then everything becomes unresponsive and the scan never finishes.