feat: extract complete multi-cabinet sets

tests/fixtures/README.md

@@ -133,6 +133,40 @@ required `0xFF` byte after each CFDATA block in memory. These are CAB-level
 codec fixtures, not OneNote exports, and do not establish producer-specific
 `.onepkg` compatibility.
 
+## libmspack five-part CAB fixture
+
+`libmspack-multi-basic-pt1.cab.b64` through
+`libmspack-multi-basic-pt5.cab.b64` are byte-for-byte copies of libmspack's
+[`multi_basic_pt*.cab`](https://github.com/kyz/libmspack/tree/55d501976171397ccd5d5a7a1ca7da065b1d9a06/libmspack/test/test_files/cabd)
+fixtures at commit
+[`55d501976171397ccd5d5a7a1ca7da065b1d9a06`](https://github.com/kyz/libmspack/commit/55d501976171397ccd5d5a7a1ca7da065b1d9a06).
+The immediate reviewed source is LGPL-2.1-only; its exact licence text is in
+`LICENSES/libmspack-LGPL-2.1.txt`.
+
+The CAB headers name the parts `cabd_multi_basic_pt1.cab` through
+`cabd_multi_basic_pt5.cab`. They form set ID 12345, indexes 0 through 4, and
+split one 190-byte uncompressed CFDATA block across all five cabinets. The
+three spanning files contain the five ASCII lines
+`This is the data from cabinet part N.` (plus line feeds), grouped as parts
+1–2, part 3, and parts 4–5.
+
+- Part 1: 221 bytes; SHA-256
+  `3658aaf68b0d538a5b321919f1de3eb1bcc258cba44e97b07a1938230995c632`.
+- Part 2: 274 bytes; SHA-256
+  `ce5fac4470fb850ae593de70ab03d3493069b77f8f81376216768bbf74e52321`.
+- Part 3: 274 bytes; SHA-256
+  `e58b57f63ac0858effa75ceb6f242b447fbce6a910d3840c37228fdbc9e7bc95`.
+- Part 4: 274 bytes; SHA-256
+  `fbcd45e503c3cffd5f5946ccc45bbc46b9884fe47abef7d09247154c7f8148fb`.
+- Part 5: 221 bytes; SHA-256
+  `16ebbb274c8dc09f98415795212683b9ea8b2d6450080a79ab63cd5cdbac7cc4`.
+
+Tests retain all hashes and exercise unordered selection, strict link/set/order
+validation, `0xFFFD`/`0xFFFE`/`0xFFFF` spanning-file reconciliation, split-block
+reassembly, reserve/compression continuity, aggregate limits, and cancellation.
+These are generic CAB fixtures, not OneNote exports, and do not establish
+producer-specific `.onepkg` compatibility.
+
 ## Distribution policy
 
 The decoded fixture bytes are used only by tests. Vite does not copy them into

tests/fixtures/libmspack-multi-basic-pt1.cab.b64

@@ -0,0 +1 @@
+TVNDRgAAAADdAAAAAAAAAGEAAAAAAAAAAwEBAAMAAgA5MAAAY2FiZF9tdWx0aV9iYXNpY19wdDIuY2FiAGJhc2ljIG11bHRpcGFydCB0ZXN0IHBhcnQgMgCvAAAAAQAAAEwAAAAAAAAA/v9sIrpZIAB0ZXN0MS50eHQAJgAAAEwAAAD+/2wiulkgAHRlc3QyLnR4dABMAAAAcgAAAP7/bCK6WSAAdGVzdDMudHh0AAAAAAAmAAAAVGhpcyBpcyB0aGUgZGF0YSBmcm9tIGNhYmluZXQgcGFydCAxLgo=

tests/fixtures/libmspack-multi-basic-pt2.cab.b64

@@ -0,0 +1 @@
+TVNDRgAAAAASAQAAAAAAAJYAAAAAAAAAAwEBAAMAAwA5MAEAY2FiZF9tdWx0aV9iYXNpY19wdDEuY2FiAGJhc2ljIG11bHRpcGFydCB0ZXN0IHBhcnQgMQBjYWJkX211bHRpX2Jhc2ljX3B0My5jYWIAYmFzaWMgbXVsdGlwYXJ0IHRlc3QgcGFydCAzAOQAAAABAAAATAAAAAAAAAD//2wiulkgAHRlc3QxLnR4dAAmAAAATAAAAP//bCK6WSAAdGVzdDIudHh0AEwAAAByAAAA//9sIrpZIAB0ZXN0My50eHQAAAAAACYAAABUaGlzIGlzIHRoZSBkYXRhIGZyb20gY2FiaW5ldCBwYXJ0IDIuCg==

tests/fixtures/libmspack-multi-basic-pt3.cab.b64

@@ -0,0 +1 @@
+TVNDRgAAAAASAQAAAAAAAJYAAAAAAAAAAwEBAAMAAwA5MAIAY2FiZF9tdWx0aV9iYXNpY19wdDIuY2FiAGJhc2ljIG11bHRpcGFydCB0ZXN0IHBhcnQgMgBjYWJkX211bHRpX2Jhc2ljX3B0NC5jYWIAYmFzaWMgbXVsdGlwYXJ0IHRlc3QgcGFydCA0AOQAAAABAAAATAAAAAAAAAD//2wiulkgAHRlc3QxLnR4dAAmAAAATAAAAP//bCK6WSAAdGVzdDIudHh0AEwAAAByAAAA//9sIrpZIAB0ZXN0My50eHQAAAAAACYAAABUaGlzIGlzIHRoZSBkYXRhIGZyb20gY2FiaW5ldCBwYXJ0IDMuCg==

tests/fixtures/libmspack-multi-basic-pt4.cab.b64

@@ -0,0 +1 @@
+TVNDRgAAAAASAQAAAAAAAJYAAAAAAAAAAwEBAAMAAwA5MAMAY2FiZF9tdWx0aV9iYXNpY19wdDMuY2FiAGJhc2ljIG11bHRpcGFydCB0ZXN0IHBhcnQgMwBjYWJkX211bHRpX2Jhc2ljX3B0NS5jYWIAYmFzaWMgbXVsdGlwYXJ0IHRlc3QgcGFydCA1AOQAAAABAAAATAAAAAAAAAD//2wiulkgAHRlc3QxLnR4dAAmAAAATAAAAP//bCK6WSAAdGVzdDIudHh0AEwAAAByAAAA//9sIrpZIAB0ZXN0My50eHQAAAAAACYAAABUaGlzIGlzIHRoZSBkYXRhIGZyb20gY2FiaW5ldCBwYXJ0IDQuCg==

tests/fixtures/libmspack-multi-basic-pt5.cab.b64

@@ -0,0 +1 @@
+TVNDRgAAAADdAAAAAAAAAGEAAAAAAAAAAwEBAAMAAQA5MAQAY2FiZF9tdWx0aV9iYXNpY19wdDQuY2FiAGJhc2ljIG11bHRpcGFydCB0ZXN0IHBhcnQgNACvAAAAAQAAAEwAAAAAAAAA/f9sIrpZIAB0ZXN0MS50eHQAJgAAAEwAAAD9/2wiulkgAHRlc3QyLnR4dABMAAAAcgAAAP3/bCK6WSAAdGVzdDMudHh0AAAAAAAmAL4AVGhpcyBpcyB0aGUgZGF0YSBmcm9tIGNhYmluZXQgcGFydCA1Lgo=

tests/release-archive.test.ts

@@ -77,6 +77,7 @@ describe('release archive', () => {
         'LICENSES/compcol-MIT.txt',
         'LICENSES/MPL-2.0.txt',
         'LICENSES/THIRD-PARTY-LICENSES.txt',
+        'LICENSES/libmspack-LGPL-2.1.txt',
         'LICENSES/lzxd-MIT.txt',
         'LICENSES/rust-cab-MIT.txt',
         'THIRD_PARTY_NOTICES.md',
@@ -100,6 +101,11 @@ describe('release archive', () => {
         .update(files['LICENSES/compcol-MIT.txt']!)
         .digest('hex')
     ).toBe('a7009ce74b33a2afcf9ab38007bf3c8f5020d9b816dc5fc7296bf17e6d7dc796');
+    expect(
+      createHash('sha256')
+        .update(files['LICENSES/libmspack-LGPL-2.1.txt']!)
+        .digest('hex')
+    ).toBe('a190dc9c8043755d90f8b0a75fa66b9e42d4af4c980bf5ddc633f0124db3cee7');
     expect(
       files['LICENSES/THIRD-PARTY-LICENSES.txt']!.toString('utf8')
     ).toContain('fflate@0.8.3');