feat(ncz): add parseNczHeader to read NCZ metadata without decompressing#40
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Exposes the section/block-table parsing that decompressNcz already does internally, so callers can compute the reconstructed NCA size up front (e.g. to build a PFS0/NSP layout and Content-Length) before streaming the decompression. decompressNcz now reuses this helper.
🦋 Changeset detectedLatest commit: 46dd0b0 The changes in this PR will be included in the next version bump. This PR includes changesets to release 2 packages
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Summary
parseNczHeader(blob)to@tootallnate/nczthat parses an NCZ's metadata header (section table, optional block table, reconstructed NCA size, and compressed-data offset) by reading only the small header region — no decompression.decompressNcznow reuses this helper internally (steps 2–5 extracted), so there's a single source of truth for the header layout.Why
Callers that repackage NSZ→NSP need the reconstructed NCA size up front (to compute a PFS0 layout and HTTP
Content-Length) before streaming the decompression. Previously that logic was buried insidedecompressNczwith no way to get the size without committing to a full decompress.sys-autopilot's host-side NSZ installer is the first consumer.Notes
parseNczHeader()+ParsedNczHeaderinterface. Backward compatible — minor bump (changeset included).decompressNcz; it just delegates parsing to the new helper.