feat(decoding): decode the v0.5, v0.6 and v0.7 frame formats by polaz · Pull Request #616 · structured-world/structured-zstd

polaz · 2026-10-20T22:44:42Z

Summary

Decodes the v0.5, v0.6 and v0.7 frame formats, as every libzstd 1.5.7 build does by default, through the same entry points as RFC 8878 frames: the Rust API, the C ABI and the command line.
legacy cargo feature, on by default; without it these frames are refused as an unknown prefix, as a libzstd built at legacy level 0 refuses them.
Replaces feat(decoding): decode the v0.5, v0.6 and v0.7 frame formats #615 (same change, squashed into one commit on current main).

Changes

decoding/legacy: one decoder per format over a shared entropy layer (FSE tables up to 4096 states, Huffman descriptions with the weight-run header, one and four streams), its tables and literal buffer reused from frame to frame. The declared content size is not enforced, since the v0.6.2 command line declares its first chunk's size; v0.5 and v0.6 refuse the RLE block type they reserve, as upstream's decoders do; a stored block (raw, or RLE in v0.7) runs to its 19-bit size field, as libzstd's one-shot decoders take it, while a compressed one stays within 128 KiB; a match is held to output and dictionary, as upstream holds it, and one longer than its offset is copied in doubling pieces. A frame cut short reports the new ErrorCode::SrcSizeWrong (srcSize_wrong through the C ABI), as libzstd does.
The decoder's settings and accessors apply to these frames as to RFC 8878 ones, on the streaming and whole-buffer paths: the content checksum mode on v0.7's 22-bit checksum, the block limit, pinned dictionary IDs and window descriptors, per-block checksums, force_dict, dictionary, content_size, blocks_decoded, the checksum accessors and workspace_size. The window ceiling, a lowered one included mid-frame, binds them where the decoder holds the window (the streaming paths), as it binds RFC 8878 frames and as libzstd applies it.
A header field the formats refuse carries libzstd's code for the path: decoded whole, v0.6 and v0.7 report corruption, as their one-shot decoders do; through a stream, an unsupported parameter.
WorkspaceDecoder refuses these frames as Unsupported::LegacyFrame: their decoders allocate, as upstream's static context refuses them too.
Frame queries (read_frame_content_size, find_frame_compressed_size, find_decompressed_size, frame_decompressed_bound, frame_header_size, new is_frame) answer for these frames, a header measured by its own format's size fields, the decompressed bound counting a stored block by its own size; the size walk refuses a block the decoder refuses from its header, as the RFC 8878 walk does.
FrameDecoder::decode_all* decodes them into the caller's slice; a Read-driven reset that meets their magic number starts a stream, so decode_blocks, decode_from_to, collect, read, StreamingDecoder and the C stream decode them unchanged. The stream keeps its history in segments of the window and a block, a stored block past 128 KiB growing it by that block alone. The calls that take RFC 8878 blocks (decode_block, block_content_len, insert_block, decode_blocks_partial) refuse while one of these frames is current.
A v0.7 frame takes its dictionary from a parsed DictionaryHandle, by ID or as given; v0.5 and v0.6 read a dictionary as its content, and a serialized one whole, header included (a handle parsed from a serialized dictionary keeps that header, registered ones too, and max_heap_size counts it). The byte-taking entry points (decode_all_with_dict_bytes, new_with_dictionary_bytes) also take a dictionary in the v0.5 or v0.6 layout, whole as content, as ZSTD_decompress_usingDict does.
New FrameDecoder::dictionaries lists every dictionary handle the decoder holds, those kept for reuse across frames of the other kind included; ZSTD_sizeof_DCtx counts them.
LegacyVersion names the formats; LegacyVersion::header_size measures a header arriving in pieces.
C ABI: ZSTD_isFrame, ZSTD_frameHeaderSize and ZSTD_decompressStream accept these frames; the queries and one-shot decoders go through the codec. No new exported symbols.
Command line: -d, -t, -c and -D decode them, -D keeping a serialized dictionary whole; -l refuses them, as the reference does.
scripts/legacy-fixtures.sh builds the v0.5.1, v0.6.2 and v0.7.5 command lines from digest-checked tags and writes zstd/legacy_frames; each frame decodes through libzstd 1.5.7 to its source.
decode_legacy fuzz target: whole-buffer and streaming decodes of the same input must agree; CI replays its committed crash inputs before a seeded run.
examples/legacy_decode_loop decodes one frame N times, whole or through a stream, for timing.

Testing

Gates: fmt, clippy in every CI feature set (no_std with and without legacy included), the full test suites of the codec, the C ABI crate and ffi-bench, doc tests and rustdoc. CI adds a no_std build with legacy, the decoding and command-line tests with the feature off, and a seeded fuzz run of decode_legacy.

Closes #131

Summary by CodeRabbit

New Features
- Added decoding support for legacy Zstandard v0.5–v0.7 frames through one-shot, streaming, command-line, and C APIs.
- Added legacy frame detection, size queries, dictionary handling, checksums, and concatenated-frame support.
- Legacy decoding is enabled by default.
Bug Fixes
- Improved dictionary preservation and memory-size reporting.
- Corrected source-size error reporting and legacy frame-header recognition.
Documentation
- Documented legacy format support and feature behavior.
Tests
- Added extensive coverage for legacy frames, dictionaries, streaming, malformed data, and mixed-format content.

Decodes the frame formats zstd wrote before 1.0, as every libzstd 1.5.7 build does by default, through the same entry points as RFC 8878 frames: the Rust API, the C ABI and the command line. The `legacy` cargo feature is on by default; without it these frames are refused as an unknown prefix, as a libzstd built at legacy level 0 refuses them. - decoding/legacy: one decoder per format over a shared entropy layer (FSE tables up to 4096 states, Huffman descriptions with the weight-run header, one and four streams), its tables and literal buffer reused from frame to frame. v0.5 and v0.6 refuse the RLE block type they reserve; a stored block (raw, or RLE in v0.7) runs to its 19-bit size field, as libzstd's one-shot decoders take it, while a compressed one stays within 128 KiB; the declared content size is not enforced, since the v0.6.2 command line declares its first chunk's size; a match is held to output and dictionary, as upstream holds it, and one longer than its offset is copied in doubling pieces. - A frame cut short reports the new ErrorCode::SrcSizeWrong (srcSize_wrong through the C ABI), as libzstd does. A header field the formats refuse carries libzstd's code for the path: decoded whole, v0.6 and v0.7 report corruption; through a stream, an unsupported parameter. - The decoder's settings and accessors apply to these frames on the streaming and whole-buffer paths: the content checksum mode on v0.7's 22-bit checksum, the block limit, pinned dictionary IDs and window descriptors, per-block checksums, force_dict, dictionary, content_size, blocks_decoded, the checksum accessors and workspace_size. The window ceiling, a lowered one included mid-frame, binds them where the decoder holds the window (the streaming paths). - Frame queries (read_frame_content_size, find_frame_compressed_size, find_decompressed_size, frame_decompressed_bound, frame_header_size, new is_frame) answer for these frames, a header measured by its own format's size fields, the decompressed bound counting a stored block by its own size; the size walk refuses a block the decoder refuses from its header. - FrameDecoder::decode_all* decodes them into the caller's slice; a Read-driven reset that meets their magic number starts a stream, so decode_blocks, decode_from_to, collect, read, StreamingDecoder and the C stream decode them unchanged. The stream keeps its history in segments of the window and a block, a stored block past 128 KiB growing it by that block alone. The calls that take RFC 8878 blocks (decode_block, block_content_len, insert_block, decode_blocks_partial) refuse while one of these frames is current. - A v0.7 frame takes its dictionary from a parsed DictionaryHandle, by ID or as given; v0.5 and v0.6 read a dictionary as its content, a serialized one whole, header included: a handle parsed from serialized bytes, registered ones included, keeps them, and max_heap_size counts them. - WorkspaceDecoder refuses these frames as Unsupported::LegacyFrame: their decoders allocate, as upstream's static context refuses them. - LegacyVersion names the formats; LegacyVersion::header_size measures a header arriving in pieces. - C ABI: ZSTD_isFrame, ZSTD_frameHeaderSize and ZSTD_decompressStream accept these frames; the queries and one-shot decoders go through the codec. No new exported symbols. - Command line: -d, -t, -c and -D decode them, -D keeping a serialized dictionary whole; -l refuses them, as the reference does. - scripts/legacy-fixtures.sh builds the v0.5.1, v0.6.2 and v0.7.5 command lines from digest-checked tags and writes zstd/legacy_frames; each frame decodes through libzstd 1.5.7 to its source. - decode_legacy fuzz target: whole-buffer and streaming decodes of the same input must agree; CI replays its committed crash inputs before a seeded run. - examples/legacy_decode_loop decodes one frame N times, whole or through a stream, for timing. Closes #131

chatgpt-codex-connector · 2026-10-20T22:44:50Z

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-21T08:02:39.057912Z	`a9383cc`	New commits

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Reviewing files that changed from the base of the PR and between 5cf88bd and a9383cc.

📒 Files selected for processing: 6

zstd/examples/legacy_decode_loop.rs
zstd/src/decoding/legacy/mod.rs
zstd/src/decoding/legacy/tests.rs
zstd/src/decoding/legacy/v05.rs
zstd/src/decoding/legacy/v06.rs
zstd/src/decoding/legacy/v07.rs

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📝 Walkthrough

The PR adds default-enabled decoding for Zstandard v0.5–v0.7 frames. It integrates legacy frame detection and decoding with Rust and C APIs, adds fixture-based tests and fuzzing, and updates feature documentation and CI coverage.

Changes: Legacy v0.5–v0.7 decoder

Layer / File(s)	Summary
Format and block decoding `zstd/src/decoding/legacy/*`, `zstd/src/decoding/errors.rs`, `zstd/src/huff0/huff0_decoder.rs`	Adds shared entropy decoding and version-specific frame, dictionary, block, checksum, and output handling for v0.5, v0.6, and v0.7.
Rust decoder integration `zstd/src/decoding/frame_decoder.rs`, `zstd/src/decoding/mod.rs`, `zstd/src/decoding/dictionary.rs`, `zstd/src/decoding/streaming_decoder.rs`, `zstd/src/decoding/workspace.rs`, `zstd/src/decoding/decode_buffer.rs`, `zstd/src/decoding/frame.rs`	Connects legacy parsing and decoding to Rust inspection, whole-frame, streaming, dictionary, workspace, and output APIs.
C API and CLI integration `c-api/src/`, `c-api/src/tests/legacy.rs`, `zstd/src/bin/structured-zstd/`	The C API recognizes legacy frames, buffers incomplete headers, starts legacy streaming decoding, accounts for retained dictionaries, and maps `SrcSizeWrong`. The CLI uses shared frame detection and dictionary handles.
Fixtures, tests, and feature setup `.github/workflows/ci.yml`, `README.md`, `scripts/legacy-fixtures.sh`, `zstd/Cargo.toml`, `zstd/examples/legacy_decode_loop.rs`, `zstd/fuzz/`, `zstd/src/decoding/tests*`, `zstd/src/lib.rs`	Enables the `legacy` feature by default and adds fixture generation, compatibility tests, fuzzing, documentation, feature-disabled checks, and CI coverage.

Priority: ➖ Normal

Estimated code review effort: 5 (Critical) | ~120 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant FrameDecoder
  participant LegacyStream
  participant VersionDecoder
  participant Output
  FrameDecoder->>LegacyStream: start frame from legacy header
  LegacyStream->>VersionDecoder: decode version-specific blocks
  VersionDecoder->>Output: write decoded bytes
  LegacyStream->>FrameDecoder: report progress and completion

Merge Risk: ⚪ Minimal · up to a9383

No actionable issue remains identified in the reviewed changes; the PR is mergeable after normal checks.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely identifies the main change: decoding Zstandard v0.5, v0.6, and v0.7 frame formats.
Linked Issues check		Issue `#131` is active and directly linked. The PR implements v0.5, v0.6, and v0.7 decoding through Rust, C ABI, CLI, frame inspection, and streaming paths. It adds the default-on `legacy` feature and f…
Out of Scope Changes check		The changes stay within issue `#131`. Decoder modules, dictionary handling, frame queries, C ABI and CLI integration, fixtures, fuzzing, CI updates, tests, documentation, and the example support legacy-…
Docstring Coverage		Docstring coverage is 82.14% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 392 functions across 33 files.

Full details: Linked Issues check

Explanation

Issue #131 is active and directly linked. The PR implements v0.5, v0.6, and v0.7 decoding through Rust, C ABI, CLI, frame inspection, and streaming paths. It adds the default-on legacy feature and feature-off rejection. Fixtures, mixed-frame tests, malformed-input tests, fuzz coverage, and CI coverage for both feature modes are present. The implementation excludes v0.1–v0.4 decoding and legacy encoding.

Full details: Out of Scope Changes check

Explanation

The changes stay within issue #131. Decoder modules, dictionary handling, frame queries, C ABI and CLI integration, fixtures, fuzzing, CI updates, tests, documentation, and the example support legacy-frame decoding or its validation. No unrelated product feature or legacy encoder is shown.

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codecov · 2026-10-20T22:49:39Z

Codecov Report

❌ Patch coverage is 99.89011% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
zstd/src/decoding/legacy/mod.rs	99.77%	2 Missing ⚠️
zstd/src/decoding/legacy/v07.rs	99.71%	1 Missing ⚠️

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- collect_to_writer on a v0.5-v0.7 frame counts what a failing writer took before the error, as the RFC 8878 path does, so a retry does not write it again (test: collect_to_writer_keeps_what_a_failing_writer_took) - new FrameDecoder::dictionaries lists every handle the decoder holds: the one kept by a v0.5-v0.7 stream while an RFC 8878 frame is current, and the reverse, and one armed for a frame not started; ZSTD_sizeof_DCtx counts them, so a context-loaded dictionary no longer drops out of the footprint (test: dictionaries_kept_across_frame_kinds_are_reported) - DictionaryHandle::decode_dict, and with it decode_all_with_dict_bytes, new_with_dictionary_bytes and add_dict_from_bytes, takes a dictionary in the v0.5 or v0.6 layout whole as content, as ZSTD_decompress_usingDict does (test: byte_entry_points_take_v05_and_v06_dictionaries) - a test that the Read adapter returns delivered bytes before reporting a damaged block that follows them Part of #131

Part of #131

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Inline comments:
Review comments at @zstd/examples/legacy_decode_loop.rs:
- Around line 4-5: Update the run instruction for the legacy_decode_loop example
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⛔ Files ignored due to path filters: 58

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📒 Files selected for processing: 40

.github/workflows/ci.yml
README.md
c-api/src/attach.rs
c-api/src/context.rs
c-api/src/error.rs
c-api/src/frame.rs
c-api/src/streaming.rs
c-api/src/tests.rs
c-api/src/tests/legacy.rs
scripts/legacy-fixtures.sh
zstd/Cargo.toml
zstd/examples/legacy_decode_loop.rs
zstd/fuzz/Cargo.toml
zstd/fuzz/fuzz_targets/decode_legacy.rs
zstd/legacy_frames/dictionary.v05
zstd/legacy_frames/dictionary.v06
zstd/legacy_frames/dictionary.v07
zstd/src/bin/structured-zstd/main.rs
zstd/src/bin/structured-zstd/tests.rs
zstd/src/decoding/decode_buffer.rs
zstd/src/decoding/dictionary.rs
zstd/src/decoding/dictionary/tests.rs
zstd/src/decoding/errors.rs
zstd/src/decoding/frame.rs
zstd/src/decoding/frame_decoder.rs
zstd/src/decoding/frame_inspection_tests.rs
zstd/src/decoding/legacy/entropy.rs
zstd/src/decoding/legacy/entropy/tests.rs
zstd/src/decoding/legacy/mod.rs
zstd/src/decoding/legacy/tests.rs
zstd/src/decoding/legacy/v05.rs
zstd/src/decoding/legacy/v06.rs
zstd/src/decoding/legacy/v07.rs
zstd/src/decoding/mod.rs
zstd/src/decoding/simd_copy/tests.rs
zstd/src/decoding/streaming_decoder.rs
zstd/src/decoding/workspace.rs
zstd/src/decoding/workspace/tests.rs
zstd/src/huff0/huff0_decoder.rs
zstd/src/lib.rs

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- execute, Output::copy_match and copy_match take the dictionary history (two slices, 32 bytes) by reference: it is fixed for the block and crossed every sequence. The crate's own release build inlines the chain and is byte-identical before and after; a dependent built without LTO keeps the per-sequence copy out - legacy_decode_loop names target/release, where the bench profile writes Part of #131

## 🤖 New release * `structured-zstd`: 0.2.3 -> 0.2.4 <details><summary>Changelog</summary> <blockquote> ## [0.2.4](v0.2.3...v0.2.4) - 2026-10-21 ### Added - *(decoding)* decode the v0.5, v0.6 and v0.7 frame formats ([#616](#616)) ### Performance - *(encode)* reuse the match tables when a compressor's dictionary changes ([#618](#618)) </blockquote> </details> --- This PR was generated with [release-plz](https://github.com/release-plz/release-plz/). Co-authored-by: sw-release-bot[bot] <255865126+sw-release-bot[bot]@users.noreply.github.com>

chatgpt-codex-connector Bot reviewed Oct 20, 2026

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Comment thread zstd/src/decoding/dictionary.rs

Comment thread zstd/src/decoding/legacy/mod.rs

Comment thread zstd/src/decoding/frame_decoder.rs Outdated

Comment thread zstd/src/decoding/frame_decoder.rs

polaz added 2 commits October 21, 2026 03:34

docs(decoding): cite where upstream reports a step error after output

5cf88bd

Part of #131

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polaz merged commit e5e6453 into main Oct 21, 2026
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polaz deleted the feat/#131-legacy-v05-v07 branch October 21, 2026 09:06

sw-release-bot Bot mentioned this pull request Oct 21, 2026

chore: release v0.2.4 #617

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feat(decoding): decode the v0.5, v0.6 and v0.7 frame formats - #616

feat(decoding): decode the v0.5, v0.6 and v0.7 frame formats#616
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feat/#131-legacy-v05-v07

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