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+CRAM codecs test files
+======================
+
+The data here corresponds to the new compression codecs implemented in
+CRAM 3.0 and 3.1.  Rather than entire CRAM files, these tests
+represent individual files compressed using a CRAM codec, with none of
+the CRAM blocks, slices or container wrappings present.
+
+Each directory corresponds to a codec, with both the CRAM compressed
+file and a corresponding gzip compressed version of the same file.
+The CRAM encoded version may have multiple variants, demonstrating
+different capabilities of that codec.  For example the CRAM 3.0 rANS
+may have an order-0 and order-1 encoding, while the CRAM 3.1 rANS adds
+additional bit-packing and RLE methods.
+
+To validate decoder implementations with these files, you should
+attempt to decode the CRAM codec-compressed file and demonstrate
+identity with the original ungzipped copy after file specific
+processing (see below).
+
+To validate an encoder, you can perform a round-trip using each
+specific codec option.  While this is not a guarantee of accuracy of
+implementation, if the round-trip works while the decoder on the
+supplied data also works, then it is a demonstration of correct data
+layout.  Note it may not be possible to simply compare compression
+outputs as two implementations may choose different frequency tables
+where rounding is required.  Both are valid, but different.
+
+Note the origin of these files is the htscodecs self test directory.
+
+    https://github.com/samtools/htscodecs/
+
+
+Processing
+----------
+
+In CRAM the quality values are just encoded together into a single
+block with no separators, such as newlines.  The rANS codec just
+compresses as-is, while the fqzcomp codec may utilise the sequence
+length in order to improve compression.  The name tokeniser doesn't
+care what the separator is, but if BYTE_ARRAY_STOP has been used in
+CRAM then they could be newline, nul or tab terminated.
+
+For ease of performing round-trip tests, all the data files here are
+textual and newline separated (with the exception of the 32-bit
+unsigned integer file "u32").
+
+Therefore some transformations are required when performing equality
+checks.
+
+As an example, we will use htscodecs' tests.
+
+    $ gzip -cd gzip/q40+dir.gz | perl -ae 'print $F[0]' | md5sum  
+    ea2e88c7a117c3989203f6987058d548  -
+
+    $ rans4x16pr -d -r ransNx16/q40+dir.1 | md5sum
+    ea2e88c7a117c3989203f6987058d548  -
+
+    $ fqzcomp_qual -d -r fqzcomp/q40+dir.3 | tr -d '\012' | md5sum
+    ea2e88c7a117c3989203f6987058d548  -
+
+The perl command outputs the first column in the uncompressed test
+data, without newlines.  (The htscodecs fqzcomp_qual program does
+however output newlines, so we are removing these for consistency,
+but this is specific to the htscodecs implementation of that test tool.)
+
+    $ gzip -cd gzip/10.names | md5sum
+    3a45331216b626bce255d12e83a615f3  -
+
+    $ tokenise_name3 -d -r < tok3/10.names.9 | tr '\000' '\012' | md5sum
+    3a45331216b626bce255d12e83a615f3  -
+
+Similarly for the name tokeniser, the htscodecs test tool is
+using nul bytes, so we transform these to newlines before comparing.
+
+The important thing here is to compare the contents of the files
+rather than the specific layout.  Whatever processing you do will be
+implementation tool specific.
+
+
+Specific test data sets
+-----------------------
+
+The gzip subdirectory has the original data with names below.
+
+### q4
+
+Fixed length Illumina quality values binned to 4 discrete values.
+Good for evaluating the PACK format of rANS-Nx16 and range.
+
+### q8
+
+Fixed length Illumina quality values binned to 8 discrete values.
+Good for evaluating the PACK format of rANS-Nx16 and range.
+
+### q40+dir
+
+Fixed length Unbinned Illumina quality values with 40 discrete values.
+This file has a second field indicating the strand, 0 for original and
+1 for reversed.  This ancillary information could be used by fqzcomp
+as a selector bit to improve compression ratios.
+
+Note only the first column will be decoded when using the pre-made
+CRAM codec compressed files (although this second column may be
+embedded in some of the fqzcomp encodings).
+
+### qvar
+
+Long read quality values with variable length records and many
+discrete quality values.
+
+### *.names
+
+Multiple sets of read names produced by a variety of platforms and in
+a variety of orders, including single and paired data and both name
+sorted and position sorted (which essentially randomises names, but
+may have pairings close by).
+
+Note some of the name files are in FASTQ format with `@name` and
+potentially ending on /1 or /2.  These won't be the format used
+internally with CRAM, but are still designed as a test for coping with
+arbitrary name formatting.
+
+The "rr.names" file contains a merge of two different name styles and
+may be a useful test for optimising the selection of the previous name
+to delta against for a name tokeniser encoder.
+
+### u32
+
+This is a binary file with 32-bit little endian integers.  It is a
+useful test of the STRIPE data interleaving capability of the rANS-Nx16
+and range codecs.
+
+Note this file is not line-wrapped and should be compared as-is.
+
+
+Notes on specific codec files
+=============================
+
+The fqzcomp, range, rans4x8, ransNx16 and tok3 directories have the
+CRAM codec compressed copies of the above files.  There will be
+multiple versions of each file with a suffix indicating the encoding
+used, as below.
+
+### rans4x8
+
+".0" and ".1" used for Order-0 and Order-1 entropy encoding
+respectively.
+
+### ransNx16
+
+The "Order" byte is extended to contain additional bits, with +8 for
+STRIPE, +64 for RLE and +128 for PACK.  The suffixes are the decimal
+version of these combinations, so ".192" for example is PACK + RLE +
+order-0.
+
+### range
+
+As per ransNx16, encoding Order, STRIPE, RLE and PACK.
+
+### fqzcomp
+
+Fqzcomp is different to the range and rans codecs in that it doesn't
+have a fixed set of data transformations.  Instead it has an internal
+description of various operations and their positions, bit-sizes and
+shifts.  We don't describe the precise configuration, and instead have
+".0" to ".3" for 4 arbitrary configuration settings.
+
+### tok3
+
+".1" to ".9" can be viewed as a compression level, like gzip -1 to
+gzip -9, with more exploration of different compression techniques.
+All of these use the rANS-Nx16 entropy encoder.
+
+".11" to ".19" are similar, but using the range coder instead.
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