NIFI-12708 UnpackContent should allow the user to specify a character set to apply in reading paths and filenames

[umarhussain15]

Summary

NIFI-12708: add option in UnpackContent to specify encoding charset for filenames in zip unpacking

The processor can now take a filename encoding parameter and pass it to zip unpacking. This will allow
user to unzip files with specific encoding to get correct filenames in output.

This for example help with zip files created on Windows which by default uses Cp437 for filename encoding.
If the filename contains special character like German alphabet ä, ü etc., decoding this with Linux's
default encoding (usually UTF8) will contain ? in output. When the same file is processed with property
set with Cp437, the processor outputs correct filenames with special characters preserved.

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  • JDK 21

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[joewitt]

@umarhussain15 Great start here. Left you a series of comments plus Dan just left one to consider as well. Thanks!

[joewitt]

Thanks @umarhussain15 - good work and good discussion