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21 lines
1.2 KiB
Markdown
21 lines
1.2 KiB
Markdown
---
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# pages-wadp
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title: Support .tar.zst uploads (zstd)
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status: completed
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type: task
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priority: normal
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created_at: 2026-07-21T04:15:13Z
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updated_at: 2026-07-21T04:33:38Z
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parent: pages-w7ow
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---
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Wire zstd-compressed tar archives through the dispatch foundation.
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- Crate: `ruzstd = \"0.8\"` in `[dependencies]` (pure-Rust, no_std-capable zstd decoder; wasm-safe).
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- Streaming path: raw bytes -> `ruzstd::StreamingDecoder` (implements io::Read) -> `build_tar_manifest`. Each tar entry Read flows through `read_entry_limited` unchanged.
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- Detect via zstd magic `28 b5 2f fd`.
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- Tests: happy path, missing index.html, path traversal, size limits, zstd tar-bomb rejected by the streaming guard. `ruzstd` is decode-focused — build .tar.zst fixtures with a real zstd encoder available in the dev shell, or vendor a small precompressed fixture; prefer generating in-test if an encoder crate is acceptable (else document the fixture).
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## Summary of Changes
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zstd via `ruzstd` 0.8 StreamingDecoder (pure Rust). Streaming path preserves the bomb guard. Fixtures built with ruzstd's own encoder (no C dev-dep). Tests: happy, missing index, traversal, limits, streaming bomb, corrupt-frame.
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