FileCacheEntry getExtractResult(int itemIndex) {
			return extractResults.get(itemIndex);
		}
Implements SevenZip bulk extract callback.
<p>
For each file in the archive, SZ will call this class's 1) getStream(), 2) prepare(), 
3) lots of write()s, and then 4) setOperationResult().
<p>
This class writes the extracted bytes to the FileCache.
Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/sevenzip/SevenZipFileSystem.java