VaptVupt v2.65.10

Performance and correctness maintenance. The wire layout is unchanged, and
valid one-shot compressed output remains byte-identical on the paired
benchmark fixtures. Corrupt encodings accepted by earlier decoders may now
return an error. Streaming reset between format versions now produces the
same bytes as a newly created context with the selected options.

• Allocate secondary hash4 matcher tables only when adaptive binary encoding
  uses them. Fast encoding, text paths, adaptive trials, optimal-parser
  prepasses and streaming avoid an unused 256 KiB map plus a window-sized
  chain: 512 KiB per default-window matcher, or 64.25 MiB at window_log=24.
  These are allocation savings, not guaranteed RSS reductions.
• Seven alternating baseline/candidate in-process runs on CPU 4 with GCC
  14.3 measured fast encoding gains of 32.3% on 1 KiB text, 19.7% on 4 KiB
  text and 17.2% on 1 MiB random data; balanced random encoding improved
  39.6%. Large text was approximately unchanged. Fixture compressed sizes
  and hashes matched. These workload-specific measurements are separate
  from the generated-v1 CLI comparison table.
• Fixed data corruption when vv_cstream_reset changes from format v1 to
  v2: reset now updates the representable match-length limit and hash3
  configuration, allocating before accepting new options. Regression cases
  exercise repeated v1/v2 transitions in balanced and extreme modes, with
  long matches and three-byte records, against fresh-context output.
• Token length extensions now require a final byte below 255, including an
  explicit zero for a zero extension. Classic LZ and legacy entropy token
  decoders also enforce the frame's advertised history window. Regressions
  cover one-shot and fragmented streaming, scalar tails, AVX2 paths, and
  valid boundary controls. Completed streaming decode continues to report
  cumulative written on subsequent calls.
• Huffman encoding returns VVH_ERR_OVERFLOW when its bit writer exhausts
  the output buffer. The accumulator remains bounded, preventing the
  undefined shift reproduced with small destination buffers. Single- and
  four-stream decoding reject codewords whose bits extend beyond input.
• Validate normalized ANS frequencies sum to 4096 before constructing
  single-stream, four-stream, global-context or local-context literal
  tables. This rejects incomplete tables that could leave decoder state
  uninitialized, and rejects overfull tables before use.
• CLI numeric arguments now require a complete, nonnegative decimal value
  within range. Unknown modes, conflicting actions and multiple inputs are
  rejected. Buffered write/close errors return failure, so a full disk
  cannot be reported as successful compression or decompression. Empty
  files no longer depend on implementation-specific malloc(0) behavior.
• make test propagates failures from every Python check. Header changes
  rebuild CLI/test consumers, core changes rebuild fuzz harnesses, and the
  SIMD fuzz object is instrumented with the selected sanitizers.
• Corrected the ratio gate's ultra_fast JSON column to invoke CLI fast:
  the old unknown CLI name silently selected balanced mode. The gate now
  checks the emitted mode byte. Its fast baseline is corrected using
  v2.65.9 fast output, verified byte-identical to this release on all ten
  fixtures; balanced/extreme pins are unchanged. This is a measurement
  correction, not a compression-ratio regression.
• Updated English and Portuguese documentation and comparison evidence.
  The copied read_ext_len formal harnesses follow the changed helper;
  historical proofs for that helper are not claimed for the new code
  without rerunning the tools. The release artifact remains source-only.

Source archive: vaptvupt-2.65.10-src.tar.gz

SHA-256: 50cdb343010f3549d518cd5bb0b84e87aedc1e42de2940ba392b11b9ccc7591e

Signed tag: v2.65.10; commit: 658e226f0fd4f4b0a2600535ee55414fe328a326.