testdata: move compression examples to re-use with lzxpress plain

[gd/samba-autobuild/.git] / testdata / compression / lzxpress-huffman / README

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-# Test vectors for LZ77+Huffman [de-]compression
-
-The three subdirectories contain files that correspond to each other
-
-./decompressed    - test files to compress with .decomp extension.
-./compressed      - files compressed as if for Windows SMB, with .lzhuff
-                    extension.
-./more-compressed - files compressed more thoroughly by Windows, using
-                    more effort than SMB does, with .lzhuff extension.
-                    Only some of the decompressed files have been
-                    compressed in this way.
-
-The compressed files were compressed on Windows, using the Compression
-API, which uses the same underlying code as MS-XCA, but which puts
-some annoying hurdles in the way. In particular, it won't compress any
-file smaller than 300 bytes. The relationship between the two is
-covered in various messages in
-
-https://lists.samba.org/archive/cifs-protocol/2022-October/
-https://lists.samba.org/archive/cifs-protocol/2022-November/
-
-Some of the decompressed files were found via fuzzing, some are designed
-to test one aspect or another of the format, while others are public
-domain texts.
-
-These are used in LZ77 + Huffman compression and decompression tests.
-
-- For decompression tests, we need the decompressed versions to
-  compare against.
-
-- For compression tests, we do not assert that the compressed file is
-  identical to the Windows compressed file. Exact equality is not
-  expected by MS-XCA, which leaves room for implementation tricks, but
-  the size of the compressed file allows us to make ballpark
-  assertions about expected compression ratios.