• Updated benchmarking to uses the criterion.rs crate. This removed the requirement for using +nightly for cargo bench. PR #620.

• Updated dependencies for release 0.34.0:

  • quick-xml: 0.38 -> 0.39. PR #617

• Refactored CFB to resolve special case in the caller of fn get_chain. PR #615.

• Performance improvements:

  • Cell reader buffer reuse and optimised maps. PR #611
  • Optimised XLS sector chain reads. PR #609
  • Ensured fast_float2 is used at all float-parsing call sites. PR #608
  • Cached path and attr lookups, reused buffers, minimised allocations. PR #606

• Fixed capitalized workbook/book stream handling in XLS files. PR #618.

• Fixed issue where BIFF5 Lbl and ExternSheet records were incorrectly parsed as BIFF8. PR #613.

• Fixed VBA check_variable_record to handle optional records. PR #614.

• Fixed premature error when BIFF version is not Biff8 in XLS files. PR #619.

• Fixed issue where XLSX cells with an empty <v/> value returned a string with index 0 instead of an Empty value. Issue #607.

• Fixed millisecond rounding issue where 1000 milliseconds weren't rounded up to the next second. Issue #602, PR #605.

• ci: add wasm32-unknown-unknown compilation check by @Goldziher in https://github.com/tafia/calamine/pull/604
• datetime: fix millisecond rounding issue by @jmcnamara in https://github.com/tafia/calamine/pull/605
• perf: cache path and attr lookups, reuse buffers, minimise allocs by @alexander-beedie in https://github.com/tafia/calamine/pull/606
• perf: ensure fast_float2 used at all float-parsing call sites by @alexander-beedie in https://github.com/tafia/calamine/pull/608
• Fix: t=s cells with empty return strings[0] instead of Empty by @omarirfa in https://github.com/tafia/calamine/pull/610
• perf: optimise xls sector chain reads by @alexander-beedie in https://github.com/tafia/calamine/pull/609
• fix(xls): do not prematurely error when biff != Biff8 by @sftse in https://github.com/tafia/calamine/pull/619
• deps: bump quick-xml from 0.38 to 0.39 by @jqnatividad in https://github.com/tafia/calamine/pull/617

• @Goldziher made their first contribution in https://github.com/tafia/calamine/pull/604
• @omarirfa made their first contribution in https://github.com/tafia/calamine/pull/610

Full Changelog: https://github.com/tafia/calamine/compare/v0.33.0...v0.34.0

• Added support for reading data from Pivot Tables, which involves reading data from the internal Pivot Cache. PR #559.

• Update dependencies for release 0.33.0:

  • zip: 4.2.0 -> 7.0.
  • atoi_simd: 0.16 -> 0.17

• Fixed potential memory exhaustion issue in ODS files that could be triggered via repeated empty rows/columns.

  The fix adds limits to prevent memory exhaustion from malicious ODS files that declare billions of repeated cells via table:number-rows-repeated and table:number-columns-repeated attributes.

  The change adds the following protection layers:

  • Add cap for columns per row at MAX_COLUMNS (16,384).
  • Add cap for total row repeats at MAX_ROWS (1,048,576).
  • Add cap for total cells at MAX_CELLS (100 million) in get_range().

  These limits match XLSX's existing row/column limits and prevent a 7KB malicious file from attempting to allocate memory for 17+ billion cells.

  When MAX_CELLS is exceeded, return OdsError::CellLimitExceeded instead of silently returning an empty range. This ensures callers are properly informed of truncation rather than receiving silent data loss.

  Issue #594, PR #596.

• Fixed an issue where XLSX files with tables that had the internal insertRow attribute set returned a Dimensions object where the end row was less than the start row. This caused an assert/panic when trying to create a Range object to return the table range. Issue #589.

• Fixed an issue with XLSX files where worksheet tables used the unusual, but valid, absolute reference system like "/xl/tables/table1.xml" instead of the common Excel generated relative system "../tables/table1.xml". Issue #587.

• xlsx: fix two table issues by @jmcnamara in https://github.com/tafia/calamine/pull/588
• ods: fix DoS via repeated rows/columns (issue #594) by @withzombies in https://github.com/tafia/calamine/pull/596
• feat: reading PivotTable (PivotCache) by @siqpush in https://github.com/tafia/calamine/pull/559

• @withzombies made their first contribution in https://github.com/tafia/calamine/pull/596
• @siqpush made their first contribution in https://github.com/tafia/calamine/pull/559

Full Changelog: https://github.com/tafia/calamine/compare/v0.32.0...v0.33.0

• Refactored VBA reading functions to be on-demand for better performance.

• Simplified vba_project() function return type from Option<Result<T>> to Result<Option<T>> for more idiomatic error handling. This is a breaking change.

• Fixed out-of-memory vulnerabilities in XLS file parsing by bounding allocations.

• Fixed and extended support for XLSX shared formulas with handling of ranges, absolute references, and column/row ranges in XLSX files.

• Fixed XLSX issue with missing shared string sub-elements. Also improved error messages for shared string parsing issues.

• Fixed acceptance of XLS XLUnicodeRichExtendedString records without reserved tags.

• Fixed various edge cases in XLS handling that could lead to parsing errors.

• typos: update list for latest version by @jmcnamara in https://github.com/tafia/calamine/pull/569
• Accept XLUnicodeRichExtendedString without reserved tag by @sftse in https://github.com/tafia/calamine/pull/571
• Oom alloc by @sftse in https://github.com/tafia/calamine/pull/575
• chore: applied some minor clippy lint suggestions by @jqnatividad in https://github.com/tafia/calamine/pull/578
• Fix issue with empty si element in xlsx shared string element by @jmcnamara in https://github.com/tafia/calamine/pull/576
• Delay reading of vba project by @sftse in https://github.com/tafia/calamine/pull/574
• Fix dragged formula multiple axes by @louisdewar in https://github.com/tafia/calamine/pull/566
• Fix absolute shared formulas by @louisdewar in https://github.com/tafia/calamine/pull/568
• refactor: dont need ref and ref mut by @sftse in https://github.com/tafia/calamine/pull/580
• XLSX: support replacing row/column ranges by @louisdewar in https://github.com/tafia/calamine/pull/582

• @louisdewar made their first contribution in https://github.com/tafia/calamine/pull/566

Full Changelog: https://github.com/tafia/calamine/compare/v0.31.0...v0.32.0

• Upgraded quick-xml to v0.38. This was a significant change in quick-xml relative to v0.37 and required changes in calamine to entity handling. It also fixes EOL handling which may lead to regressions in calamine applications if they expected to see "\r\n" in strings instead of the correct (for XML and Excel) "\n".

  For most users these will be inconsequential changes but please take note before upgrading production code.

• Renamed the "dates" feature flag to "chrono" since there is now some native date handling features without "chrono". The "chrono" flag is more specific and accurate. The "dates" flag is still supported as before for backward compatibility.

  This change also made some datatype methods related to date/times available in the "default" feature set. They were previously hidden unnecessarily behind the "dates/"chrono" flag.

• Added a conversion function to ExcelDateTime to convert the inner serial Excel datetime to standard year, month, date, hour, minute, second and millisecond components. Works for 1900 and 1904 epochs.

• Fixed issue where Excel xlsx shared formula failed if it contained Unicode characters. Issue #553.

• Fixed issue where Excel XML escapes in strings weren't unescaped. For example "_x000D_" -> "\r". Issue #469.

• fix: xlsx cell name handling for non-ASCII characters by @hayandev in https://github.com/tafia/calamine/pull/552
• xls: add simple Debug trait for Record struct by @jmcnamara in https://github.com/tafia/calamine/pull/554
• clippy: fix clippy warnings by @jmcnamara in https://github.com/tafia/calamine/pull/555
• clippy: ensure clippy is installed in github action by @jmcnamara in https://github.com/tafia/calamine/pull/564
• xml: make parsing changes for quick-xml v0.38 by @jmcnamara in https://github.com/tafia/calamine/pull/561
• datetime: add native conversion from excel datetime by @jmcnamara in https://github.com/tafia/calamine/pull/546

• @hayandev made their first contribution in https://github.com/tafia/calamine/pull/552

Full Changelog: https://github.com/tafia/calamine/compare/v0.30.1...v0.31.0

• Added Debug and Clone to Table for easier debugging. PR #547.

• Fixed issue Issue #548 for xls files where the SST record had an incorrect number of unique strings.

• feat: #[derive(Debug, Clone)] on Table by @lukapeschke in https://github.com/tafia/calamine/pull/547
• xls: fix issue with incorrect SST record by @jmcnamara in https://github.com/tafia/calamine/pull/549

Full Changelog: https://github.com/tafia/calamine/compare/v0.30.0...v0.30.1

• Unpinned the zip.rs dependency from v4.2.0 to allow cargo to choose the correct version for the user's rustc version.

  The Rust MSRV was bumped to v1.75.0 (which it should have been for for zip.rs compatibility in previous releases).

  See the discussion at Issue #527.

• small language changes to README.md by @mhogervo in https://github.com/tafia/calamine/pull/537
• Fix typos and add typos GH Actions workflow to prevent future typos by @jqnatividad in https://github.com/tafia/calamine/pull/539
• unpin zip and using MSRV-aware in CI by @Dirreke in https://github.com/tafia/calamine/pull/542

• @mhogervo made their first contribution in https://github.com/tafia/calamine/pull/537

Full Changelog: https://github.com/tafia/calamine/compare/v0.29.0...v0.30.0

• Add additional documentation and examples for the Range, Cell, XlsxError and Table structs, and Xlsx Table and Merge methods. Issue #459

• Pin zip.rs to v4.2.0.

  The current latest release of zip.rs, v4.3.0, requires a MSRV of v1.85.0. This release pins zip.rs to v4.2.0 to allow users to maintain a MSRV of v1.73.0 for at least one more release. It is likely that calamine v0.30.0 or later will move back to the latest zip.rs v4.x and require rustc v1.85.0.

• Fixed issue where XLSX files had Windows style directory separators for internal paths instead of the required Unix style separators. Issue #530.
• Fixed several XLS parsing issues which could lead to out-of-memory errors. PR #525.
• Fixed numeric underflow in Xlsx::from_sparse() and also ensured that the associated Range of cells would be in row-column order. PR #524.

• Fix wrong comment by @YichiZhang0613 in https://github.com/tafia/calamine/pull/518
• docs: fixes and additions by @jmcnamara in https://github.com/tafia/calamine/pull/519
• Refactors by @sftse in https://github.com/tafia/calamine/pull/520
• Add GitHub issue templates by @jmcnamara in https://github.com/tafia/calamine/pull/523
• Numeric underflow by @sftse in https://github.com/tafia/calamine/pull/524
• More OOM fixes by @sftse in https://github.com/tafia/calamine/pull/525
• Some Changelog improvements by @jmcnamara in https://github.com/tafia/calamine/pull/522
• Pin zip.rs to v4.2.0 (for now) by @jmcnamara in https://github.com/tafia/calamine/pull/532
• Add tests and fixes for issues with Excel packaging part names by @jmcnamara in https://github.com/tafia/calamine/pull/531
• Documentation updates by @jmcnamara in https://github.com/tafia/calamine/pull/526
• docs: add documentation to the example files by @jmcnamara in https://github.com/tafia/calamine/pull/534

• @YichiZhang0613 made their first contribution in https://github.com/tafia/calamine/pull/518
• @jmcnamara made their first contribution in https://github.com/tafia/calamine/pull/519

Full Changelog: https://github.com/tafia/calamine/compare/v0.28.0...v0.29.0

• Bump zip to 4.0.

• bump v0.27.0 by @tafia in https://github.com/tafia/calamine/pull/499
• fix for zip v2.6 semver violation by @sbruton in https://github.com/tafia/calamine/pull/500
• Bump zip to 4.0 by @prophittcorey in https://github.com/tafia/calamine/pull/506

• @sbruton made their first contribution in https://github.com/tafia/calamine/pull/500

Full Changelog: https://github.com/tafia/calamine/compare/v0.27.0...v0.28.0

• (xls): add one more Error variant related to formatting.

• Bump dependencies.

• (xls): Invalid formats parsing.
• Always parse string cell as string.
• Pin zip crate to 2.5.
• (xlsx): check 'closing' tag name with more prefixes.

• README.md: (misc) Fix example by @simnalamburt in https://github.com/tafia/calamine/pull/475
• build(deps): bump quick-xml to 0.36 by @PrettyWood in https://github.com/tafia/calamine/pull/473
• fix: always parse a string cell as string by @PrettyWood in https://github.com/tafia/calamine/pull/472
• perf: accelerated datatype conversion by @jqnatividad in https://github.com/tafia/calamine/pull/482
• Bump to quick-xml 0.37 by @jqnatividad in https://github.com/tafia/calamine/pull/477
• Pin zip crate to 2.5.* by @prophittcorey in https://github.com/tafia/calamine/pull/497
• read_string: fix comparison with 'closing' tag name by @falconandy in https://github.com/tafia/calamine/pull/490
• Malformed format by @sftse in https://github.com/tafia/calamine/pull/479

• @simnalamburt made their first contribution in https://github.com/tafia/calamine/pull/475
• @falconandy made their first contribution in https://github.com/tafia/calamine/pull/490

Full Changelog: https://github.com/tafia/calamine/compare/v0.26.1...v0.27.0

• Sparse cells expect 0 index rows, even when using header_row.

• fix: header row in the middle can break by @PrettyWood in https://github.com/tafia/calamine/pull/470

Full Changelog: https://github.com/tafia/calamine/compare/v0.26.0...v0.26.1