Since #2425 checks Agile encryption's dataIntegrity, every workbook Excel
encrypts fails with "the decrypted data failed its integrity check". The
reader keyed the HMAC with the decrypted encryptedHmacKey cut to the salt
size (16 bytes), as [MS-OFFCRYPTO] 2.3.4.14 describes it, but Excel's key
is as long as the hash: 64 bytes for SHA-512. The check now accepts a key
of either length, so spec-literal writers still open and a modified
package still fails.
The test encryptor writes the integrity key as Excel does, so every
encrypted fixture now has Excel's layout; a new test covers both key
lengths, a key of neither length, and tampering with each.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Saving a large workbook spent about half its time building worksheet XML,
mostly in small per-cell allocations. The writer now appends to the part
directly:
- Cell references, row numbers, style ids, shared string indexes and
numbers are appended without temporary strings (push_a1, push_u64,
push_num), and text is escaped in place (push_esc, with a fast path for
plain ASCII).
- sheetData walks the cell store in its own row-major order instead of
copying every address into a BTreeSet and a per-row BTreeMap and looking
each cell up again. Cells outside the store (pictures, spill values,
table headers) still go through the sorted set.
- Formulas with nothing the file spells differently (no LET/LAMBDA, no
_xlfn function, no spill, @, trim operator or structured reference) are
printed from the shared expression instead of being cloned and rebuilt
twice by the file rewrite.
- The A1 printer in gridcraft-formula appends references to the output
instead of formatting each anchor into its own string.
The output is byte-for-byte unchanged.
write_perf, 200,000 rows (2.0M cells, 14.2 MB package), release, Ryzen
16 threads / Linux, 36 interleaved runs each:
before: median 2083.9 ms, min 1615.7 ms
after: median 1501.3 ms, min 1192.3 ms (-28.0 % median, -26.2 % min)
What remains is mostly deflate (zlib-rs, level 6), about 70 % of the save.
Tests pin the exact sheetData of a workbook covering row settings between
cell rows, spill values, every value kind, number spellings, escaping and
formulas with and without a file spelling (generated with the previous
writer), and check each appending helper and the formula fast path against
the code they replace.
The formula fast path is guarded by a test that runs both paths over every
function in the gridcraft-functions registry (a new dev-dependency, allowed
by the layer rules), in 15 surrounding shapes covering every operator and
rewrite, so a function or rewrite added later without updating the trigger
list fails it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* fix(ui-egui): dropdown menus regrow while open
Use craft_ui's ComboBox and combo::Menu so a menu that shrank (a filter with
no matches) grows back when the filter is cleared (egui#5225). Repin
craft-libs to one revision.
* chore(deps): craft-libs 60d60d48 (dropdown fixes)
* chore(deps): craft-libs 6af63481 (dropdown fixes)
* chore(deps): craft-libs 4d7b82f7 (dropdown fixes)
* chore(deps): craft-libs 92d392cf (#387 merged)
`cargo run --release -p gridcraft-xlsx --example write_perf -- [rows] [runs] [out.xlsx]`
builds a sales-style workbook (order ids, dates, categories, numbers, two
formula columns with cached values, booleans, sparse notes, a summary sheet)
and times write_xlsx, printing each run and the median / minimum. An optional
output path keeps the last package for byte comparisons between builds.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
