- Modified GZipFilePart to only access stream.Position when stream.CanSeek is true
- Modified GZipArchiveEntry.OpenEntryStream to check CanSeek before accessing Position
- Added test case GZip_Archive_NonSeekableStream to verify non-seekable stream support
- All existing tests pass
Co-authored-by: adamhathcock <527620+adamhathcock@users.noreply.github.com>
Update `RarHeaderFactoryTests` and `GZipArchiveTests` to open the test
readers as `FileAccess.Read` and `FileShare.Read` to prevent issues with
multiple test from trying to open exclusive access to files.
Tests fail in Visual Studio because they try to reuse the same scratch
working space, and each test is responsible for resetting the space. To
simplify the test code:
1. Make `TestBase` `IDisposable` and have it create the scratch space
2. Remove `ResetScratch()` as it is now handled by the base class
3. Add a unique ID to each scrach space folder to prevent collisions
