From 30b0357530d1b76e7037e70ca7dbf0925b8138e2 Mon Sep 17 00:00:00 2001
From: Albrecht Degering <albrecht@degering.name>
Date: Wed, 22 Jul 2026 19:15:51 +0200
Subject: [PATCH] feat: parse bounded FSSHTTPB packages

---
 THIRD_PARTY_NOTICES.md                        |   6 +
 src/onenote/fsshttpb/data-elements.ts         | 723 ++++++++++++++++++
 src/onenote/fsshttpb/index.ts                 |   5 +
 src/onenote/fsshttpb/package.test.ts          | 111 +++
 src/onenote/fsshttpb/package.ts               | 128 ++++
 src/onenote/fsshttpb/primitives.test.ts       |  47 ++
 src/onenote/fsshttpb/primitives.ts            | 279 +++++++
 src/onenote/fsshttpb/types.ts                 | 173 +++++
 tests/fixtures/README.md                      |  21 +
 .../joplin-quick-notes-fsshttp.one.b64        | 302 ++++++++
 10 files changed, 1795 insertions(+)
 create mode 100644 src/onenote/fsshttpb/data-elements.ts
 create mode 100644 src/onenote/fsshttpb/index.ts
 create mode 100644 src/onenote/fsshttpb/package.test.ts
 create mode 100644 src/onenote/fsshttpb/package.ts
 create mode 100644 src/onenote/fsshttpb/primitives.test.ts
 create mode 100644 src/onenote/fsshttpb/primitives.ts
 create mode 100644 src/onenote/fsshttpb/types.ts
 create mode 100644 tests/fixtures/joplin-quick-notes-fsshttp.one.b64

diff --git a/THIRD_PARTY_NOTICES.md b/THIRD_PARTY_NOTICES.md
index 7546b4f..2cfc741 100644
--- a/THIRD_PARTY_NOTICES.md
+++ b/THIRD_PARTY_NOTICES.md
@@ -34,6 +34,12 @@ The Base64-encoded Joplin `test.onepkg` fixture is pinned at commit
 `1e73aad7eb08fde5d9e4cb533df40052a5cd32d7` and is likewise test-only data
 distributed under AGPL-3.0-or-later.
 
+The Base64-encoded Joplin `Simple notebook/Quick Notes.one` fixture is copied
+from the pinned `onenote.rs` test corpus at revision
+`5138a39a3f4e72b840932f9872fecde52fa9da60`. Its adjacent upstream notice
+attributes the data to Joplin under AGPL-3.0-or-later; it is test-only and its
+hash and provenance are recorded in `tests/fixtures/README.md`.
+
 The encoded fixture bytes are excluded from `dist` and the release ZIP. The
 release retains the fixture provenance document and AGPL text so these notices
 remain complete.
diff --git a/src/onenote/fsshttpb/data-elements.ts b/src/onenote/fsshttpb/data-elements.ts
new file mode 100644
index 0000000..7f54071
--- /dev/null
+++ b/src/onenote/fsshttpb/data-elements.ts
@@ -0,0 +1,723 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+// SPDX-License-Identifier: MPL-2.0
+//
+// Portions adapted from onenote.rs (MPL-2.0), revision
+// 5138a39a3f4e72b840932f9872fecde52fa9da60: `fsshttpb/data_element/*`.
+// Deviations: immutable zero-copy payload views, duplicate rejection, exact
+// header-length validation, explicit count/byte limits, and offset-aware errors.
+
+import { BinaryReader } from '../binary/BinaryReader.js';
+import { readGuid } from '../binary/guid.js';
+import type { ExGuid } from '../onestore/types.js';
+import { exGuidKey } from '../onestore/types.js';
+import { OneNoteParserError } from '../parser/error.js';
+import type { OneNoteParserLimits } from '../parser/limits.js';
+import {
+  expectFssHttpEnd,
+  expectFssHttpStart,
+  finishFssHttpBody,
+  hasFssHttpEnd,
+  readCompactNumber,
+  readFssHttpCellId,
+  readFssHttpCellIdArray,
+  readFssHttpExGuid,
+  readFssHttpExGuidArray,
+  readFssHttpSerialNumber,
+  readFssHttpStreamHeader,
+  takeFssHttpHeaderBody,
+} from './primitives.js';
+import {
+  FSSHTTP_OBJECT,
+  fssHttpCellKey,
+  type FssHttpDataElementFragment,
+  type FssHttpDataElementPackage,
+  type FssHttpObjectDeclaration,
+  type FssHttpObjectGroup,
+  type FssHttpObjectGroupData,
+  type FssHttpRevisionManifest,
+  type FssHttpStorageIndex,
+  type FssHttpStorageManifest,
+  type FssHttpStreamHeader,
+} from './types.js';
+
+interface DataElementContext {
+  limits: OneNoteParserLimits;
+  elementCount: number;
+  objectCount: number;
+  blobCount: number;
+  totalBlobBytes: number;
+}
+
+export function parseFssHttpDataElementPackage(
+  reader: BinaryReader,
+  limits: OneNoteParserLimits
+): FssHttpDataElementPackage {
+  const header = expectFssHttpStart(
+    reader,
+    FSSHTTP_OBJECT.dataElementPackage,
+    true,
+    2
+  );
+  const body = takeFssHttpHeaderBody(
+    reader,
+    header,
+    'Data Element Package start'
+  );
+  if (body.u8() !== 0) {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      'Data Element Package reserved byte is not zero',
+      { offset: body.offset - 1, structure: 'Data Element Package' }
+    );
+  }
+  finishFssHttpBody(body, 'Data Element Package start');
+
+  const result: FssHttpDataElementPackage = {
+    storageIndexes: new Map(),
+    storageManifests: new Map(),
+    cellManifests: new Map(),
+    revisionManifests: new Map(),
+    objectGroups: new Map(),
+    fragments: new Map(),
+    blobs: new Map(),
+  };
+  const context: DataElementContext = {
+    limits,
+    elementCount: 0,
+    objectCount: 0,
+    blobCount: 0,
+    totalBlobBytes: 0,
+  };
+
+  while (!hasFssHttpEnd(reader, FSSHTTP_OBJECT.dataElementPackage)) {
+    context.elementCount += 1;
+    if (context.elementCount > limits.maxStreamIds) {
+      throw new OneNoteParserError(
+        'LIMIT_EXCEEDED',
+        `Data element count exceeds ${limits.maxStreamIds}`,
+        { offset: reader.offset, structure: 'Data Element Package' }
+      );
+    }
+    parseDataElement(reader, result, context);
+  }
+  expectFssHttpEnd(reader, FSSHTTP_OBJECT.dataElementPackage);
+  return result;
+}
+
+function parseDataElement(
+  reader: BinaryReader,
+  result: FssHttpDataElementPackage,
+  context: DataElementContext
+): void {
+  const header = expectFssHttpStart(
+    reader,
+    FSSHTTP_OBJECT.dataElement,
+    true,
+    2
+  );
+  const body = takeFssHttpHeaderBody(reader, header, 'Data Element start');
+  const id = readFssHttpExGuid(body);
+  readFssHttpSerialNumber(body);
+  const type = readCompactNumber(body, 0xff, 'Data element type');
+  finishFssHttpBody(body, 'Data Element start');
+
+  switch (type) {
+    case 0x01:
+      insertUnique(
+        result.storageIndexes,
+        id,
+        parseStorageIndex(reader, context),
+        header.offset,
+        'Storage Index'
+      );
+      break;
+    case 0x02:
+      insertUnique(
+        result.storageManifests,
+        id,
+        parseStorageManifest(reader, context),
+        header.offset,
+        'Storage Manifest'
+      );
+      break;
+    case 0x03:
+      insertUnique(
+        result.cellManifests,
+        id,
+        parseCellManifest(reader),
+        header.offset,
+        'Cell Manifest'
+      );
+      break;
+    case 0x04:
+      insertUnique(
+        result.revisionManifests,
+        id,
+        parseRevisionManifest(reader, context),
+        header.offset,
+        'Revision Manifest'
+      );
+      break;
+    case 0x05:
+      insertUnique(
+        result.objectGroups,
+        id,
+        parseObjectGroup(reader, context),
+        header.offset,
+        'Object Group'
+      );
+      break;
+    case 0x06:
+      insertUnique(
+        result.fragments,
+        id,
+        parseDataElementFragment(reader, context),
+        header.offset,
+        'Data Element Fragment'
+      );
+      break;
+    case 0x0a:
+      insertUnique(
+        result.blobs,
+        id,
+        parseObjectDataBlob(reader, context),
+        header.offset,
+        'Object Data BLOB'
+      );
+      break;
+    default:
+      throw new OneNoteParserError(
+        'UNSUPPORTED_FORMAT',
+        `Unsupported FSSHTTPB data element type 0x${type.toString(16)}`,
+        { offset: header.offset, structure: 'Data Element' }
+      );
+  }
+}
+
+function parseStorageIndex(
+  reader: BinaryReader,
+  context: DataElementContext
+): FssHttpStorageIndex {
+  const manifestMappings: FssHttpStorageIndex['manifestMappings'] = [];
+  const cellMappings: FssHttpStorageIndex['cellMappings'] = new Map();
+  const revisionMappings: FssHttpStorageIndex['revisionMappings'] = new Map();
+  let count = 0;
+
+  while (!hasFssHttpEnd(reader, FSSHTTP_OBJECT.dataElement)) {
+    count = boundedIncrement(
+      count,
+      context.limits.maxStreamIds,
+      reader,
+      'Storage Index mappings'
+    );
+    const header = readFssHttpStreamHeader(reader, 2);
+    if (header.compound) unexpectedCompound(header, 'Storage Index mapping');
+    const body = takeFssHttpHeaderBody(reader, header, 'Storage Index mapping');
+    if (header.type === FSSHTTP_OBJECT.storageIndexManifestMapping) {
+      manifestMappings.push({
+        id: readFssHttpExGuid(body),
+        serial: readFssHttpSerialNumber(body),
+      });
+    } else if (header.type === FSSHTTP_OBJECT.storageIndexCellMapping) {
+      const cellId = readFssHttpCellId(body);
+      const mapping = {
+        cellId,
+        id: readFssHttpExGuid(body),
+        serial: readFssHttpSerialNumber(body),
+      };
+      insertUniqueKey(
+        cellMappings,
+        fssHttpCellKey(cellId),
+        mapping,
+        header.offset,
+        'Storage Index Cell Mapping'
+      );
+    } else if (header.type === FSSHTTP_OBJECT.storageIndexRevisionMapping) {
+      const id = readFssHttpExGuid(body);
+      const mapping = {
+        id,
+        revision: readFssHttpExGuid(body),
+        serial: readFssHttpSerialNumber(body),
+      };
+      insertUnique(
+        revisionMappings,
+        id,
+        mapping,
+        header.offset,
+        'Storage Index Revision Mapping'
+      );
+    } else {
+      unexpectedType(header, 'Storage Index');
+    }
+    finishFssHttpBody(body, 'Storage Index mapping');
+  }
+  expectFssHttpEnd(reader, FSSHTTP_OBJECT.dataElement);
+  return { manifestMappings, cellMappings, revisionMappings };
+}
+
+function parseStorageManifest(
+  reader: BinaryReader,
+  context: DataElementContext
+): FssHttpStorageManifest {
+  const schemaHeader = expectFssHttpStart(
+    reader,
+    FSSHTTP_OBJECT.storageManifest,
+    false,
+    2
+  );
+  const schemaBody = takeFssHttpHeaderBody(
+    reader,
+    schemaHeader,
+    'Storage Manifest schema'
+  );
+  const schema = readGuid(schemaBody);
+  finishFssHttpBody(schemaBody, 'Storage Manifest schema');
+
+  const roots = new Map<string, ReturnType<typeof readFssHttpCellId>>();
+  let count = 0;
+  while (!hasFssHttpEnd(reader, FSSHTTP_OBJECT.dataElement)) {
+    count = boundedIncrement(
+      count,
+      context.limits.maxStreamIds,
+      reader,
+      'Storage Manifest roots'
+    );
+    const header = expectFssHttpStart(
+      reader,
+      FSSHTTP_OBJECT.storageManifestRoot,
+      false,
+      2
+    );
+    const body = takeFssHttpHeaderBody(reader, header, 'Storage Manifest root');
+    const rootId = readFssHttpExGuid(body);
+    const cell = readFssHttpCellId(body);
+    finishFssHttpBody(body, 'Storage Manifest root');
+    insertUniqueKey(
+      roots,
+      exGuidKey(rootId),
+      cell,
+      header.offset,
+      'Storage Manifest root'
+    );
+  }
+  expectFssHttpEnd(reader, FSSHTTP_OBJECT.dataElement);
+  return { schema, roots };
+}
+
+function parseCellManifest(reader: BinaryReader): ExGuid {
+  const header = expectFssHttpStart(
+    reader,
+    FSSHTTP_OBJECT.cellManifest,
+    false,
+    2
+  );
+  const body = takeFssHttpHeaderBody(reader, header, 'Cell Manifest');
+  const revisionId = readFssHttpExGuid(body);
+  finishFssHttpBody(body, 'Cell Manifest');
+  expectFssHttpEnd(reader, FSSHTTP_OBJECT.dataElement);
+  return revisionId;
+}
+
+function parseRevisionManifest(
+  reader: BinaryReader,
+  context: DataElementContext
+): FssHttpRevisionManifest {
+  const manifestHeader = expectFssHttpStart(
+    reader,
+    FSSHTTP_OBJECT.revisionManifest,
+    false,
+    2
+  );
+  const manifestBody = takeFssHttpHeaderBody(
+    reader,
+    manifestHeader,
+    'Revision Manifest'
+  );
+  const revisionId = readFssHttpExGuid(manifestBody);
+  const baseRevisionId = readFssHttpExGuid(manifestBody);
+  finishFssHttpBody(manifestBody, 'Revision Manifest');
+
+  const roots: FssHttpRevisionManifest['roots'] = [];
+  const objectGroupIds: ExGuid[] = [];
+  let count = 0;
+  while (!hasFssHttpEnd(reader, FSSHTTP_OBJECT.dataElement)) {
+    count = boundedIncrement(
+      count,
+      context.limits.maxStreamIds,
+      reader,
+      'Revision Manifest entries'
+    );
+    const header = readFssHttpStreamHeader(reader, 2);
+    if (header.compound) unexpectedCompound(header, 'Revision Manifest entry');
+    const body = takeFssHttpHeaderBody(
+      reader,
+      header,
+      'Revision Manifest entry'
+    );
+    if (header.type === FSSHTTP_OBJECT.revisionManifestRoot) {
+      roots.push({
+        role: readFssHttpExGuid(body),
+        objectId: readFssHttpExGuid(body),
+      });
+    } else if (header.type === FSSHTTP_OBJECT.revisionManifestGroupReference) {
+      objectGroupIds.push(readFssHttpExGuid(body));
+    } else {
+      unexpectedType(header, 'Revision Manifest');
+    }
+    finishFssHttpBody(body, 'Revision Manifest entry');
+  }
+  expectFssHttpEnd(reader, FSSHTTP_OBJECT.dataElement);
+  return { revisionId, baseRevisionId, roots, objectGroupIds };
+}
+
+function parseObjectGroup(
+  reader: BinaryReader,
+  context: DataElementContext
+): FssHttpObjectGroup {
+  const declarationsHeader = expectFssHttpStart(
+    reader,
+    FSSHTTP_OBJECT.objectGroupDeclaration,
+    true
+  );
+  const declarationsBody = takeFssHttpHeaderBody(
+    reader,
+    declarationsHeader,
+    'Object Group Declarations start'
+  );
+  finishFssHttpBody(declarationsBody, 'Object Group Declarations start');
+
+  const declarations: FssHttpObjectDeclaration[] = [];
+  while (!hasFssHttpEnd(reader, FSSHTTP_OBJECT.objectGroupDeclaration)) {
+    context.objectCount += 1;
+    if (context.objectCount > context.limits.maxObjects) {
+      throw new OneNoteParserError(
+        'LIMIT_EXCEEDED',
+        `FSSHTTPB object declaration count exceeds ${context.limits.maxObjects}`,
+        { offset: reader.offset, structure: 'Object Group Declarations' }
+      );
+    }
+    declarations.push(parseObjectDeclaration(reader, context));
+  }
+  expectFssHttpEnd(reader, FSSHTTP_OBJECT.objectGroupDeclaration);
+
+  const changeFrequencies: number[] = [];
+  let dataHeader = readFssHttpStreamHeader(reader);
+  if (dataHeader.type === FSSHTTP_OBJECT.objectGroupMetadataBlock) {
+    if (!dataHeader.compound)
+      unexpectedCompound(dataHeader, 'Object Group Metadata Block', true);
+    const metadataBody = takeFssHttpHeaderBody(
+      reader,
+      dataHeader,
+      'Object Group Metadata Block start'
+    );
+    finishFssHttpBody(metadataBody, 'Object Group Metadata Block start');
+    while (!hasFssHttpEnd(reader, FSSHTTP_OBJECT.objectGroupMetadataBlock)) {
+      if (changeFrequencies.length >= context.limits.maxObjects) {
+        throw new OneNoteParserError(
+          'LIMIT_EXCEEDED',
+          `Object Group metadata count exceeds ${context.limits.maxObjects}`,
+          { offset: reader.offset, structure: 'Object Group Metadata Block' }
+        );
+      }
+      const header = expectFssHttpStart(
+        reader,
+        FSSHTTP_OBJECT.objectGroupMetadata,
+        false,
+        4
+      );
+      const body = takeFssHttpHeaderBody(
+        reader,
+        header,
+        'Object Group Metadata'
+      );
+      const frequency = readCompactNumber(body, 4, 'Object change frequency');
+      changeFrequencies.push(frequency);
+      finishFssHttpBody(body, 'Object Group Metadata');
+    }
+    expectFssHttpEnd(reader, FSSHTTP_OBJECT.objectGroupMetadataBlock);
+    dataHeader = readFssHttpStreamHeader(reader);
+  }
+  if (
+    dataHeader.type !== FSSHTTP_OBJECT.objectGroupData ||
+    !dataHeader.compound
+  ) {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      `Expected Object Group Data, found type 0x${dataHeader.type.toString(16)}`,
+      { offset: dataHeader.offset, structure: 'Object Group' }
+    );
+  }
+  const dataStartBody = takeFssHttpHeaderBody(
+    reader,
+    dataHeader,
+    'Object Group Data start'
+  );
+  finishFssHttpBody(dataStartBody, 'Object Group Data start');
+
+  const data: FssHttpObjectGroupData[] = [];
+  while (!hasFssHttpEnd(reader, FSSHTTP_OBJECT.objectGroupData)) {
+    if (data.length >= context.limits.maxObjects) {
+      throw new OneNoteParserError(
+        'LIMIT_EXCEEDED',
+        `Object Group data count exceeds ${context.limits.maxObjects}`,
+        { offset: reader.offset, structure: 'Object Group Data' }
+      );
+    }
+    data.push(parseObjectGroupData(reader, context));
+  }
+  expectFssHttpEnd(reader, FSSHTTP_OBJECT.objectGroupData);
+  expectFssHttpEnd(reader, FSSHTTP_OBJECT.dataElement);
+  return { declarations, changeFrequencies, data };
+}
+
+function parseObjectDeclaration(
+  reader: BinaryReader,
+  context: DataElementContext
+): FssHttpObjectDeclaration {
+  const header = readFssHttpStreamHeader(reader);
+  if (header.compound) unexpectedCompound(header, 'Object declaration');
+  const body = takeFssHttpHeaderBody(reader, header, 'Object declaration');
+  const objectId = readFssHttpExGuid(body);
+  let result: FssHttpObjectDeclaration;
+  if (header.type === FSSHTTP_OBJECT.objectGroupObject) {
+    result = {
+      kind: 'object',
+      objectId,
+      partitionId: readCompactNumber(body, 4, 'Object partition ID'),
+      dataSize: readCompactNumber(
+        body,
+        context.limits.maxVectorBytes,
+        'Object data size'
+      ),
+      objectReferenceCount: readCompactNumber(
+        body,
+        context.limits.maxObjectReferences,
+        'Object reference count'
+      ),
+      cellReferenceCount: readCompactNumber(
+        body,
+        context.limits.maxObjectReferences,
+        'Cell reference count'
+      ),
+    };
+  } else if (header.type === FSSHTTP_OBJECT.objectGroupDataBlob) {
+    result = {
+      kind: 'blob',
+      objectId,
+      blobId: readFssHttpExGuid(body),
+      partitionId: readCompactNumber(body, 4, 'Object partition ID'),
+      objectReferenceCount: readCompactNumber(
+        body,
+        context.limits.maxObjectReferences,
+        'Object reference count'
+      ),
+      cellReferenceCount: readCompactNumber(
+        body,
+        context.limits.maxObjectReferences,
+        'Cell reference count'
+      ),
+    };
+  } else {
+    unexpectedType(header, 'Object Group Declarations');
+  }
+  finishFssHttpBody(body, 'Object declaration');
+  return result;
+}
+
+function parseObjectGroupData(
+  reader: BinaryReader,
+  context: DataElementContext
+): FssHttpObjectGroupData {
+  const header = readFssHttpStreamHeader(reader);
+  if (header.compound) unexpectedCompound(header, 'Object Group data entry');
+  const body = takeFssHttpHeaderBody(reader, header, 'Object Group data entry');
+  const objectReferences = readFssHttpExGuidArray(body, context.limits);
+  const cellReferences = readFssHttpCellIdArray(body, context.limits);
+  let result: FssHttpObjectGroupData;
+  if (header.type === FSSHTTP_OBJECT.objectGroupDataExcluded) {
+    result = {
+      kind: 'excluded',
+      objectReferences,
+      cellReferences,
+      dataSize: readCompactNumber(
+        body,
+        context.limits.maxVectorBytes,
+        'Excluded object data size'
+      ),
+    };
+  } else if (header.type === FSSHTTP_OBJECT.objectGroupDataObject) {
+    const size = readCompactNumber(
+      body,
+      context.limits.maxVectorBytes,
+      'Object binary item size'
+    );
+    result = {
+      kind: 'object',
+      objectReferences,
+      cellReferences,
+      data: body.read(size),
+    };
+  } else if (header.type === FSSHTTP_OBJECT.objectGroupBlobReference) {
+    result = {
+      kind: 'blob-reference',
+      objectReferences,
+      cellReferences,
+      blobId: readFssHttpExGuid(body),
+    };
+  } else {
+    unexpectedType(header, 'Object Group Data');
+  }
+  finishFssHttpBody(body, 'Object Group data entry');
+  return result;
+}
+
+function parseObjectDataBlob(
+  reader: BinaryReader,
+  context: DataElementContext
+) {
+  const header = expectFssHttpStart(
+    reader,
+    FSSHTTP_OBJECT.objectDataBlob,
+    false
+  );
+  const body = takeFssHttpHeaderBody(reader, header, 'Object Data BLOB');
+  const size = readCompactNumber(
+    body,
+    context.limits.maxFileDataBytes,
+    'Object Data BLOB size'
+  );
+  context.blobCount += 1;
+  context.totalBlobBytes += size;
+  if (context.blobCount > context.limits.maxFileDataObjects) {
+    throw new OneNoteParserError(
+      'LIMIT_EXCEEDED',
+      `Object Data BLOB count exceeds ${context.limits.maxFileDataObjects}`,
+      { offset: header.offset, structure: 'Object Data BLOB' }
+    );
+  }
+  if (context.totalBlobBytes > context.limits.maxTotalFileDataBytes) {
+    throw new OneNoteParserError(
+      'LIMIT_EXCEEDED',
+      `Object Data BLOB bytes exceed ${context.limits.maxTotalFileDataBytes}`,
+      { offset: header.offset, structure: 'Object Data BLOB' }
+    );
+  }
+  const offset = body.offset;
+  body.skip(size);
+  finishFssHttpBody(body, 'Object Data BLOB');
+  expectFssHttpEnd(reader, FSSHTTP_OBJECT.dataElement);
+  return { source: reader.bytes, offset, size };
+}
+
+function parseDataElementFragment(
+  reader: BinaryReader,
+  context: DataElementContext
+): FssHttpDataElementFragment {
+  const header = expectFssHttpStart(
+    reader,
+    FSSHTTP_OBJECT.dataElementFragment,
+    false,
+    4
+  );
+  const body = takeFssHttpHeaderBody(reader, header, 'Data Element Fragment');
+  const dataElementId = readFssHttpExGuid(body);
+  const fragmentSize = readCompactNumber(
+    body,
+    context.limits.maxFileBytes,
+    'Fragmented data element size'
+  );
+  const chunkOffset = readCompactNumber(
+    body,
+    fragmentSize,
+    'Fragment chunk offset'
+  );
+  const chunkLength = readCompactNumber(
+    body,
+    context.limits.maxVectorBytes,
+    'Fragment chunk length'
+  );
+  if (chunkOffset + chunkLength > fragmentSize) {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      'Fragment chunk range exceeds the fragmented data element size',
+      { offset: header.offset, structure: 'Data Element Fragment' }
+    );
+  }
+  if (body.remaining !== chunkLength) {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      `Fragment header declares ${chunkLength} data bytes; ${body.remaining} remain`,
+      { offset: header.offset, structure: 'Data Element Fragment' }
+    );
+  }
+  const data = body.read(chunkLength);
+  finishFssHttpBody(body, 'Data Element Fragment');
+  expectFssHttpEnd(reader, FSSHTTP_OBJECT.dataElement);
+  return { dataElementId, fragmentSize, chunkOffset, chunkLength, data };
+}
+
+function boundedIncrement(
+  current: number,
+  limit: number,
+  reader: BinaryReader,
+  structure: string
+): number {
+  const next = current + 1;
+  if (next > limit) {
+    throw new OneNoteParserError(
+      'LIMIT_EXCEEDED',
+      `${structure} count exceeds ${limit}`,
+      { offset: reader.offset, structure }
+    );
+  }
+  return next;
+}
+
+function insertUnique<T>(
+  map: Map<string, T>,
+  id: ExGuid,
+  value: T,
+  offset: number,
+  structure: string
+): void {
+  insertUniqueKey(map, exGuidKey(id), value, offset, structure);
+}
+
+function insertUniqueKey<T>(
+  map: Map<string, T>,
+  key: string,
+  value: T,
+  offset: number,
+  structure: string
+): void {
+  if (map.has(key)) {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      `${structure} identifier ${key} is duplicated`,
+      { offset, structure }
+    );
+  }
+  map.set(key, value);
+}
+
+function unexpectedType(header: FssHttpStreamHeader, structure: string): never {
+  throw new OneNoteParserError(
+    'INVALID_STRUCTURE',
+    `Unexpected stream object type 0x${header.type.toString(16)}`,
+    { offset: header.offset, structure }
+  );
+}
+
+function unexpectedCompound(
+  header: FssHttpStreamHeader,
+  structure: string,
+  expected = false
+): never {
+  throw new OneNoteParserError(
+    'INVALID_STRUCTURE',
+    `${structure} must be ${expected ? 'compound' : 'single'}`,
+    { offset: header.offset, structure }
+  );
+}
diff --git a/src/onenote/fsshttpb/index.ts b/src/onenote/fsshttpb/index.ts
new file mode 100644
index 0000000..3b2d7fe
--- /dev/null
+++ b/src/onenote/fsshttpb/index.ts
@@ -0,0 +1,5 @@
+export { parseFssHttpOneStorePackage } from './package.js';
+export type {
+  FssHttpDataElementPackage,
+  FssHttpOneStorePackage,
+} from './types.js';
diff --git a/src/onenote/fsshttpb/package.test.ts b/src/onenote/fsshttpb/package.test.ts
new file mode 100644
index 0000000..08011b0
--- /dev/null
+++ b/src/onenote/fsshttpb/package.test.ts
@@ -0,0 +1,111 @@
+import { createHash } from 'node:crypto';
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+
+import { describe, expect, it } from 'vitest';
+
+import { ONE_SECTION_FILE_TYPE } from '../parser/detect-format.js';
+import { resolveParserLimits } from '../parser/limits.js';
+import {
+  FSSHTTP_SECTION_SCHEMA,
+  parseFssHttpOneStorePackage,
+} from './package.js';
+
+function fixtureBytes(): Uint8Array {
+  const encoded = readFileSync(
+    resolve(process.cwd(), 'tests/fixtures/joplin-quick-notes-fsshttp.one.b64'),
+    'utf8'
+  );
+  return Uint8Array.from(Buffer.from(encoded.replaceAll(/\s/gu, ''), 'base64'));
+}
+
+describe('FSSHTTPB OneStore packaging', () => {
+  it('retains and parses the pinned Joplin Quick Notes fixture', () => {
+    const bytes = fixtureBytes();
+    expect(bytes).toHaveLength(17_197);
+    expect(createHash('sha256').update(bytes).digest('hex')).toBe(
+      '5e501ef5f539cd2f149786f57659be9d0762913d863a69867deb9c8e8c43efe2'
+    );
+
+    const parsed = parseFssHttpOneStorePackage(bytes, resolveParserLimits());
+    expect(parsed).toMatchObject({
+      fileType: ONE_SECTION_FILE_TYPE,
+      cellSchema: FSSHTTP_SECTION_SCHEMA,
+    });
+    expect({
+      indexes: parsed.dataElements.storageIndexes.size,
+      manifests: parsed.dataElements.storageManifests.size,
+      cells: parsed.dataElements.cellManifests.size,
+      revisions: parsed.dataElements.revisionManifests.size,
+      groups: parsed.dataElements.objectGroups.size,
+      fragments: parsed.dataElements.fragments.size,
+      blobs: parsed.dataElements.blobs.size,
+    }).toEqual({
+      indexes: 1,
+      manifests: 1,
+      cells: 4,
+      revisions: 9,
+      groups: 9,
+      fragments: 0,
+      blobs: 0,
+    });
+  });
+
+  it('rejects malformed reserved bytes with an absolute offset', () => {
+    const bytes = fixtureBytes();
+    bytes[64] = 1;
+    expect(() =>
+      parseFssHttpOneStorePackage(bytes, resolveParserLimits())
+    ).toThrowError(
+      expect.objectContaining({
+        code: 'INVALID_STRUCTURE',
+        offset: 64,
+        structure: 'OneStore Packaging Structure',
+      })
+    );
+  });
+
+  it('rejects a truncated package as a bounded parse failure', () => {
+    const bytes = fixtureBytes().subarray(0, 1_000);
+    expect(() =>
+      parseFssHttpOneStorePackage(bytes, resolveParserLimits())
+    ).toThrowError(
+      expect.objectContaining({
+        code: 'BOUNDS_EXCEEDED',
+        offset: expect.any(Number),
+      })
+    );
+  });
+
+  it('enforces source and data-element count limits', () => {
+    const bytes = fixtureBytes();
+    expect(() =>
+      parseFssHttpOneStorePackage(
+        bytes,
+        resolveParserLimits({ maxFileBytes: bytes.byteLength - 1 })
+      )
+    ).toThrowError(
+      expect.objectContaining({ code: 'LIMIT_EXCEEDED', offset: 0 })
+    );
+    expect(() =>
+      parseFssHttpOneStorePackage(
+        bytes,
+        resolveParserLimits({ maxStreamIds: 1 })
+      )
+    ).toThrowError(expect.objectContaining({ code: 'LIMIT_EXCEEDED' }));
+  });
+
+  it('allows only zero bytes after the packaging end marker', () => {
+    const bytes = fixtureBytes();
+    bytes[bytes.length - 1] = 1;
+    expect(() =>
+      parseFssHttpOneStorePackage(bytes, resolveParserLimits())
+    ).toThrowError(
+      expect.objectContaining({
+        code: 'INVALID_STRUCTURE',
+        offset: bytes.length - 1,
+        structure: 'OneStore Packaging Structure padding',
+      })
+    );
+  });
+});
diff --git a/src/onenote/fsshttpb/package.ts b/src/onenote/fsshttpb/package.ts
new file mode 100644
index 0000000..c0bd95a
--- /dev/null
+++ b/src/onenote/fsshttpb/package.ts
@@ -0,0 +1,128 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+// SPDX-License-Identifier: MPL-2.0
+//
+// Portions adapted from onenote.rs (MPL-2.0), revision
+// 5138a39a3f4e72b840932f9872fecde52fa9da60: `fsshttpb/packaging.rs`.
+// Deviations: direct immutable browser bytes, exact envelope consumption,
+// explicit bounds, and offset-aware failures.
+
+import { BinaryReader } from '../binary/BinaryReader.js';
+import { readGuid } from '../binary/guid.js';
+import {
+  FSSHTTP_PACKAGING_FORMAT,
+  ONE_SECTION_FILE_TYPE,
+  ONE_TOC_FILE_TYPE,
+} from '../parser/detect-format.js';
+import { OneNoteParserError } from '../parser/error.js';
+import type { OneNoteParserLimits } from '../parser/limits.js';
+import { parseFssHttpDataElementPackage } from './data-elements.js';
+import {
+  expectFssHttpEnd,
+  expectFssHttpStart,
+  finishFssHttpBody,
+  readFssHttpExGuid,
+  takeFssHttpHeaderBody,
+} from './primitives.js';
+import { FSSHTTP_OBJECT, type FssHttpOneStorePackage } from './types.js';
+
+export const FSSHTTP_SECTION_SCHEMA = '{1F937CB4-B26F-445F-B9F8-17E20160E461}';
+export const FSSHTTP_TOC_SCHEMA = '{E4DBFD38-E5C7-408B-A8A1-0E7B421E1F5F}';
+
+/** Parse the MS-ONESTORE 2.8.1 package envelope and its data elements. */
+export function parseFssHttpOneStorePackage(
+  bytes: Uint8Array,
+  limits: OneNoteParserLimits
+): FssHttpOneStorePackage {
+  if (bytes.byteLength > limits.maxFileBytes) {
+    throw new OneNoteParserError(
+      'LIMIT_EXCEEDED',
+      `FSSHTTP-packaged OneNote source is ${bytes.byteLength} bytes (limit ${limits.maxFileBytes})`,
+      { offset: 0, structure: 'OneStore Packaging Structure' }
+    );
+  }
+  const reader = new BinaryReader(
+    bytes,
+    0,
+    bytes.byteLength,
+    'OneStore Packaging Structure'
+  );
+  const fileType = readGuid(reader);
+  const fileIdentity = readGuid(reader);
+  const legacyFileVersion = readGuid(reader);
+  const fileFormat = readGuid(reader);
+  if (fileType !== ONE_SECTION_FILE_TYPE && fileType !== ONE_TOC_FILE_TYPE) {
+    throw new OneNoteParserError(
+      'INVALID_FORMAT',
+      `Unsupported package-store file type ${fileType}`,
+      { offset: 0, structure: 'OneStore Packaging Structure' }
+    );
+  }
+  if (fileFormat !== FSSHTTP_PACKAGING_FORMAT) {
+    throw new OneNoteParserError(
+      'INVALID_FORMAT',
+      `Expected package-store format ${FSSHTTP_PACKAGING_FORMAT}, found ${fileFormat}`,
+      { offset: 48, structure: 'OneStore Packaging Structure' }
+    );
+  }
+  if (reader.u32() !== 0) {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      'Package-store reserved bytes are not zero',
+      { offset: 64, structure: 'OneStore Packaging Structure' }
+    );
+  }
+
+  const packagingHeader = expectFssHttpStart(
+    reader,
+    FSSHTTP_OBJECT.oneNotePackaging,
+    true,
+    4
+  );
+  const packagingBody = takeFssHttpHeaderBody(
+    reader,
+    packagingHeader,
+    'OneNote Packaging start'
+  );
+  const storageIndexId = readFssHttpExGuid(packagingBody);
+  const cellSchema = readGuid(packagingBody);
+  finishFssHttpBody(packagingBody, 'OneNote Packaging start');
+  if (
+    (fileType === ONE_SECTION_FILE_TYPE &&
+      cellSchema !== FSSHTTP_SECTION_SCHEMA) ||
+    (fileType === ONE_TOC_FILE_TYPE && cellSchema !== FSSHTTP_TOC_SCHEMA)
+  ) {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      `Cell schema ${cellSchema} does not match package file type ${fileType}`,
+      { offset: packagingHeader.bodyOffset, structure: 'guidCellSchemaId' }
+    );
+  }
+
+  const dataElements = parseFssHttpDataElementPackage(reader, limits);
+  expectFssHttpEnd(reader, FSSHTTP_OBJECT.oneNotePackaging);
+  // OneDrive exports observed in the pinned corpus pad the package to the
+  // physical file size. The packaging end is authoritative, but non-zero
+  // trailing data is never accepted as padding.
+  while (reader.remaining > 0) {
+    const offset = reader.offset;
+    if (reader.u8() !== 0) {
+      throw new OneNoteParserError(
+        'INVALID_STRUCTURE',
+        'OneStore Packaging Structure has non-zero trailing data',
+        { offset, structure: 'OneStore Packaging Structure padding' }
+      );
+    }
+  }
+
+  return {
+    fileType,
+    fileIdentity,
+    legacyFileVersion,
+    fileFormat,
+    storageIndexId,
+    cellSchema,
+    dataElements,
+  };
+}
diff --git a/src/onenote/fsshttpb/primitives.test.ts b/src/onenote/fsshttpb/primitives.test.ts
new file mode 100644
index 0000000..99a0555
--- /dev/null
+++ b/src/onenote/fsshttpb/primitives.test.ts
@@ -0,0 +1,47 @@
+import { describe, expect, it } from 'vitest';
+
+import { BinaryReader } from '../binary/BinaryReader.js';
+import {
+  readCompactU64,
+  readFssHttpExGuid,
+  readFssHttpStreamHeader,
+} from './primitives.js';
+
+describe('FSSHTTPB primitives', () => {
+  it.each([
+    [[0x00], 0n],
+    [[(0x5a << 1) | 1], 0x5an],
+    [[0xd2, 0x48], 0x1234n],
+    [
+      [0x80, 0xef, 0xcd, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01],
+      0x0123_4567_89ab_cdefn,
+    ],
+  ] as const)('decodes compact unsigned integer %j', (input, expected) => {
+    const reader = new BinaryReader(Uint8Array.from(input));
+    expect(readCompactU64(reader)).toBe(expected);
+    expect(reader.remaining).toBe(0);
+  });
+
+  it('rejects a truncated extended GUID at the original absolute offset', () => {
+    const reader = new BinaryReader(
+      Uint8Array.from([0, 0, 0x80, 1, 2]),
+      2,
+      3,
+      'test ExGuid'
+    );
+    expect(() => readFssHttpExGuid(reader)).toThrowError(
+      expect.objectContaining({ code: 'BOUNDS_EXCEEDED', offset: 3 })
+    );
+  });
+
+  it('rejects stream-object end markers where a start is required', () => {
+    const reader = new BinaryReader(Uint8Array.from([0x05]));
+    expect(() => readFssHttpStreamHeader(reader)).toThrowError(
+      expect.objectContaining({
+        code: 'INVALID_STRUCTURE',
+        offset: 0,
+        structure: 'FSSHTTPB stream object header',
+      })
+    );
+  });
+});
diff --git a/src/onenote/fsshttpb/primitives.ts b/src/onenote/fsshttpb/primitives.ts
new file mode 100644
index 0000000..d8b0ac2
--- /dev/null
+++ b/src/onenote/fsshttpb/primitives.ts
@@ -0,0 +1,279 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+// SPDX-License-Identifier: MPL-2.0
+//
+// Portions adapted from onenote.rs (MPL-2.0), revision
+// 5138a39a3f4e72b840932f9872fecde52fa9da60: `fsshttpb/data/
+// {cell_id,compact_u64,exguid,serial_number,stream_object}.rs`. Deviations:
+// all ranges and integer conversions are checked with offset-aware errors.
+
+import { BinaryReader } from '../binary/BinaryReader.js';
+import { NIL_GUID, readGuid } from '../binary/guid.js';
+import type { ExGuid } from '../onestore/types.js';
+import { OneNoteParserError } from '../parser/error.js';
+import type { OneNoteParserLimits } from '../parser/limits.js';
+import type {
+  FssHttpCellId,
+  FssHttpSerialNumber,
+  FssHttpStreamHeader,
+} from './types.js';
+
+export function readCompactU64(reader: BinaryReader): bigint {
+  const offset = reader.offset;
+  const first = reader.u8();
+  if (first === 0) return 0n;
+  if ((first & 0x01) !== 0) return BigInt(first >>> 1);
+
+  let width: number;
+  if ((first & 0x02) !== 0) width = 2;
+  else if ((first & 0x04) !== 0) width = 3;
+  else if ((first & 0x08) !== 0) width = 4;
+  else if ((first & 0x10) !== 0) width = 5;
+  else if ((first & 0x20) !== 0) width = 6;
+  else if ((first & 0x40) !== 0) width = 7;
+  else if ((first & 0x80) !== 0) return reader.u64();
+  else {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      `Invalid compact unsigned integer marker 0x${first.toString(16)}`,
+      { offset, structure: 'Compact unsigned 64-bit integer' }
+    );
+  }
+
+  const rest = reader.read(width - 1);
+  let encoded = BigInt(first);
+  for (let index = 0; index < rest.length; index += 1) {
+    encoded |= BigInt(rest[index]!) << BigInt((index + 1) * 8);
+  }
+  return encoded >> BigInt(width);
+}
+
+export function readCompactNumber(
+  reader: BinaryReader,
+  limit: number,
+  structure: string
+): number {
+  const offset = reader.offset;
+  const value = readCompactU64(reader);
+  if (value > BigInt(Number.MAX_SAFE_INTEGER) || value > BigInt(limit)) {
+    throw new OneNoteParserError(
+      'LIMIT_EXCEEDED',
+      `${structure} value ${value.toString()} exceeds limit ${limit}`,
+      { offset, structure }
+    );
+  }
+  return Number(value);
+}
+
+export function readFssHttpExGuid(reader: BinaryReader): ExGuid {
+  const offset = reader.offset;
+  const first = reader.u8();
+  if (first === 0) return { guid: NIL_GUID, value: 0 };
+
+  let value: number;
+  if ((first & 0x07) === 0x04) {
+    value = first >>> 3;
+  } else if ((first & 0x3f) === 0x20) {
+    value = (reader.u8() << 2) | (first >>> 6);
+  } else if ((first & 0x7f) === 0x40) {
+    value = (reader.u16() << 1) | (first >>> 7);
+  } else if (first === 0x80) {
+    value = reader.u32();
+  } else {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      `Invalid extended GUID marker 0x${first.toString(16)}`,
+      { offset, structure: 'Extended GUID' }
+    );
+  }
+  return { guid: readGuid(reader), value };
+}
+
+export function readFssHttpExGuidArray(
+  reader: BinaryReader,
+  limits: OneNoteParserLimits
+): ExGuid[] {
+  const count = readCompactNumber(
+    reader,
+    limits.maxObjectReferences,
+    'Extended GUID array count'
+  );
+  const result: ExGuid[] = [];
+  for (let index = 0; index < count; index += 1) {
+    result.push(readFssHttpExGuid(reader));
+  }
+  return result;
+}
+
+export function readFssHttpCellId(reader: BinaryReader): FssHttpCellId {
+  return {
+    context: readFssHttpExGuid(reader),
+    objectSpace: readFssHttpExGuid(reader),
+  };
+}
+
+export function readFssHttpCellIdArray(
+  reader: BinaryReader,
+  limits: OneNoteParserLimits
+): FssHttpCellId[] {
+  const count = readCompactNumber(
+    reader,
+    limits.maxObjectReferences,
+    'Cell ID array count'
+  );
+  const result: FssHttpCellId[] = [];
+  for (let index = 0; index < count; index += 1) {
+    result.push(readFssHttpCellId(reader));
+  }
+  return result;
+}
+
+export function readFssHttpSerialNumber(
+  reader: BinaryReader
+): FssHttpSerialNumber {
+  const kind = reader.u8();
+  if (kind === 0) return { guid: NIL_GUID, value: 0n };
+  return { guid: readGuid(reader), value: reader.u64() };
+}
+
+export function readFssHttpStreamHeader(
+  reader: BinaryReader,
+  requiredWidth?: 2 | 4
+): FssHttpStreamHeader {
+  const offset = reader.offset;
+  const marker = reader.bytes[offset]! & 0x03;
+  let width: 2 | 4;
+  let raw: number;
+  if (marker === 0) {
+    width = 2;
+    raw = reader.u16();
+  } else if (marker === 2) {
+    width = 4;
+    raw = reader.u32();
+  } else {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      `Unexpected stream object start marker ${marker}`,
+      { offset, structure: 'FSSHTTPB stream object header' }
+    );
+  }
+  if (requiredWidth !== undefined && width !== requiredWidth) {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      `Expected a ${requiredWidth * 8}-bit stream object header`,
+      { offset, structure: 'FSSHTTPB stream object header' }
+    );
+  }
+
+  const compound = (raw & 0x04) !== 0;
+  const type = width === 2 ? (raw >>> 3) & 0x3f : (raw >>> 3) & 0x3fff;
+  let lengthValue = BigInt(width === 2 ? raw >>> 9 : raw >>> 17);
+  if (width === 4 && lengthValue === 0x7fffn) {
+    lengthValue = readCompactU64(reader);
+  }
+  if (lengthValue > BigInt(Number.MAX_SAFE_INTEGER)) {
+    throw new OneNoteParserError(
+      'LIMIT_EXCEEDED',
+      `Stream object length ${lengthValue.toString()} is not a safe integer`,
+      { offset, structure: 'FSSHTTPB stream object header' }
+    );
+  }
+  const length = Number(lengthValue);
+  const bodyOffset = reader.offset;
+  const bodyEnd = bodyOffset + length;
+  if (!Number.isSafeInteger(bodyEnd) || bodyEnd > reader.end) {
+    throw new OneNoteParserError(
+      'BOUNDS_EXCEEDED',
+      `Stream object body (${bodyOffset}, ${length}) exceeds its containing data`,
+      { offset, structure: 'FSSHTTPB stream object header' }
+    );
+  }
+  return { offset, width, compound, type, length, bodyOffset, bodyEnd };
+}
+
+export function expectFssHttpStart(
+  reader: BinaryReader,
+  type: number,
+  compound: boolean,
+  requiredWidth?: 2 | 4
+): FssHttpStreamHeader {
+  const header = readFssHttpStreamHeader(reader, requiredWidth);
+  if (header.type !== type || header.compound !== compound) {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      `Expected stream object 0x${type.toString(16)} (${compound ? 'compound' : 'single'}), found 0x${header.type.toString(16)} (${header.compound ? 'compound' : 'single'})`,
+      { offset: header.offset, structure: 'FSSHTTPB stream object header' }
+    );
+  }
+  return header;
+}
+
+export function finishFssHttpHeaderBody(
+  reader: BinaryReader,
+  header: FssHttpStreamHeader,
+  structure: string
+): void {
+  if (reader.offset !== header.bodyEnd) {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      `${structure} consumed ${reader.offset - header.bodyOffset} bytes; its header declares ${header.length}`,
+      { offset: header.offset, structure }
+    );
+  }
+}
+
+export function takeFssHttpHeaderBody(
+  reader: BinaryReader,
+  header: FssHttpStreamHeader,
+  structure: string
+): BinaryReader {
+  if (reader.offset !== header.bodyOffset) {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      `${structure} body is not read immediately after its header`,
+      { offset: header.offset, structure }
+    );
+  }
+  return reader.subview(header.length, structure);
+}
+
+export function finishFssHttpBody(body: BinaryReader, structure: string): void {
+  if (body.remaining !== 0) {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      `${structure} has ${body.remaining} unread declared bytes`,
+      { offset: body.offset, structure }
+    );
+  }
+}
+
+export function hasFssHttpEnd(reader: BinaryReader, type: number): boolean {
+  if (type <= 0x3f) {
+    if (reader.remaining < 1) return false;
+    const raw = reader.bytes[reader.offset]!;
+    return (raw & 0x03) === 1 && raw >>> 2 === type;
+  }
+  if (reader.remaining < 2) return false;
+  const raw = new DataView(
+    reader.bytes.buffer,
+    reader.bytes.byteOffset + reader.offset,
+    2
+  ).getUint16(0, true);
+  return (raw & 0x03) === 3 && raw >>> 2 === type;
+}
+
+export function expectFssHttpEnd(reader: BinaryReader, type: number): void {
+  const offset = reader.offset;
+  const actual = type <= 0x3f ? reader.u8() : reader.u16();
+  const marker = actual & 0x03;
+  const actualType = actual >>> 2;
+  const expectedMarker = type <= 0x3f ? 1 : 3;
+  if (marker !== expectedMarker || actualType !== type) {
+    throw new OneNoteParserError(
+      'INVALID_STRUCTURE',
+      `Expected stream object end 0x${type.toString(16)}, found marker ${marker} type 0x${actualType.toString(16)}`,
+      { offset, structure: 'FSSHTTPB stream object end' }
+    );
+  }
+}
diff --git a/src/onenote/fsshttpb/types.ts b/src/onenote/fsshttpb/types.ts
new file mode 100644
index 0000000..69aabcd
--- /dev/null
+++ b/src/onenote/fsshttpb/types.ts
@@ -0,0 +1,173 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at https://mozilla.org/MPL/2.0/.
+// SPDX-License-Identifier: MPL-2.0
+//
+// Portions adapted from onenote.rs (MPL-2.0), revision
+// 5138a39a3f4e72b840932f9872fecde52fa9da60: `fsshttpb/{data,
+// data_element,packaging}.rs`. Deviations: serializable TypeScript records,
+// zero-copy byte ranges, checked integer conversion, and explicit limits.
+
+import type { ExGuid, FileDataBlobReference } from '../onestore/types.js';
+
+export const FSSHTTP_OBJECT = {
+  dataElement: 0x01,
+  objectDataBlob: 0x02,
+  objectGroupDataExcluded: 0x03,
+  objectGroupDataBlob: 0x05,
+  storageManifestRoot: 0x07,
+  revisionManifestRoot: 0x0a,
+  cellManifest: 0x0b,
+  storageManifest: 0x0c,
+  storageIndexRevisionMapping: 0x0d,
+  storageIndexCellMapping: 0x0e,
+  storageIndexManifestMapping: 0x11,
+  dataElementPackage: 0x15,
+  objectGroupDataObject: 0x16,
+  objectGroupObject: 0x18,
+  revisionManifestGroupReference: 0x19,
+  revisionManifest: 0x1a,
+  objectGroupBlobReference: 0x1c,
+  objectGroupDeclaration: 0x1d,
+  objectGroupData: 0x1e,
+  dataElementFragment: 0x6a,
+  objectGroupMetadata: 0x78,
+  objectGroupMetadataBlock: 0x79,
+  oneNotePackaging: 0x7a,
+} as const;
+
+export interface FssHttpStreamHeader {
+  offset: number;
+  width: 2 | 4;
+  compound: boolean;
+  type: number;
+  length: number;
+  bodyOffset: number;
+  bodyEnd: number;
+}
+
+export interface FssHttpSerialNumber {
+  guid: string;
+  value: bigint;
+}
+
+export interface FssHttpCellId {
+  context: ExGuid;
+  objectSpace: ExGuid;
+}
+
+export interface FssHttpStorageIndexManifestMapping {
+  id: ExGuid;
+  serial: FssHttpSerialNumber;
+}
+
+export interface FssHttpStorageIndexCellMapping {
+  cellId: FssHttpCellId;
+  id: ExGuid;
+  serial: FssHttpSerialNumber;
+}
+
+export interface FssHttpStorageIndexRevisionMapping {
+  id: ExGuid;
+  revision: ExGuid;
+  serial: FssHttpSerialNumber;
+}
+
+export interface FssHttpStorageIndex {
+  manifestMappings: FssHttpStorageIndexManifestMapping[];
+  cellMappings: Map<string, FssHttpStorageIndexCellMapping>;
+  revisionMappings: Map<string, FssHttpStorageIndexRevisionMapping>;
+}
+
+export interface FssHttpStorageManifest {
+  schema: string;
+  roots: Map<string, FssHttpCellId>;
+}
+
+export interface FssHttpRevisionRoot {
+  role: ExGuid;
+  objectId: ExGuid;
+}
+
+export interface FssHttpRevisionManifest {
+  revisionId: ExGuid;
+  baseRevisionId: ExGuid;
+  roots: FssHttpRevisionRoot[];
+  objectGroupIds: ExGuid[];
+}
+
+export type FssHttpObjectDeclaration =
+  | {
+      kind: 'object';
+      objectId: ExGuid;
+      partitionId: number;
+      dataSize: number;
+      objectReferenceCount: number;
+      cellReferenceCount: number;
+    }
+  | {
+      kind: 'blob';
+      objectId: ExGuid;
+      blobId: ExGuid;
+      partitionId: number;
+      objectReferenceCount: number;
+      cellReferenceCount: number;
+    };
+
+export type FssHttpObjectGroupData =
+  | {
+      kind: 'object';
+      objectReferences: ExGuid[];
+      cellReferences: FssHttpCellId[];
+      data: Uint8Array;
+    }
+  | {
+      kind: 'excluded';
+      objectReferences: ExGuid[];
+      cellReferences: FssHttpCellId[];
+      dataSize: number;
+    }
+  | {
+      kind: 'blob-reference';
+      objectReferences: ExGuid[];
+      cellReferences: FssHttpCellId[];
+      blobId: ExGuid;
+    };
+
+export interface FssHttpObjectGroup {
+  declarations: FssHttpObjectDeclaration[];
+  changeFrequencies: number[];
+  data: FssHttpObjectGroupData[];
+}
+
+export interface FssHttpDataElementFragment {
+  dataElementId: ExGuid;
+  fragmentSize: number;
+  chunkOffset: number;
+  chunkLength: number;
+  data: Uint8Array;
+}
+
+export interface FssHttpDataElementPackage {
+  storageIndexes: Map<string, FssHttpStorageIndex>;
+  storageManifests: Map<string, FssHttpStorageManifest>;
+  cellManifests: Map<string, ExGuid>;
+  revisionManifests: Map<string, FssHttpRevisionManifest>;
+  objectGroups: Map<string, FssHttpObjectGroup>;
+  fragments: Map<string, FssHttpDataElementFragment>;
+  blobs: Map<string, FileDataBlobReference>;
+}
+
+export interface FssHttpOneStorePackage {
+  fileType: string;
+  fileIdentity: string;
+  legacyFileVersion: string;
+  fileFormat: string;
+  storageIndexId: ExGuid;
+  cellSchema: string;
+  dataElements: FssHttpDataElementPackage;
+}
+
+export function fssHttpCellKey(cell: FssHttpCellId): string {
+  return `${cell.context.guid}:${cell.context.value}/${cell.objectSpace.guid}:${cell.objectSpace.value}`;
+}
diff --git a/tests/fixtures/README.md b/tests/fixtures/README.md
index dd3d33a..1e9544e 100644
--- a/tests/fixtures/README.md
+++ b/tests/fixtures/README.md
@@ -38,6 +38,27 @@ and does not change the underlying file's licence.
 Tests verify the package hash, all seven paths, the native `.one` magic for
 every section, section parse statuses, and representative title/text output.
 
+## `joplin-quick-notes-fsshttp.one.b64`
+
+- Immediate reviewed source: `onenote.rs`
+  [`crates/parser/tests/samples/joplin/Simple notebook/Quick Notes.one`](https://github.com/msiemens/onenote.rs/blob/5138a39a3f4e72b840932f9872fecde52fa9da60/crates/parser/tests/samples/joplin/Simple%20notebook/Quick%20Notes.one)
+  at the parser reference revision
+  `5138a39a3f4e72b840932f9872fecde52fa9da60`; introduced there by commit
+  `3011a1f0f2a13288aa8ac366f783adc0673e4989` as test data from Joplin.
+- Upstream attribution recorded alongside the source fixture: Joplin,
+  copyright Laurent Cozic, AGPL-3.0-or-later. The full licence is retained in
+  `LICENSES/AGPL-3.0.txt`.
+- Decoded size: 17,197 bytes.
+- Decoded SHA-256:
+  `5e501ef5f539cd2f149786f57659be9d0762913d863a69867deb9c8e8c43efe2`.
+- Golden package expectation: FSSHTTPB package-store section with one Storage
+  Index, one Storage Manifest, four Cell Manifests, nine Revision Manifests,
+  and nine Object Groups. This fixture contains no Data Element Fragments or
+  Object Data BLOB elements.
+
+Tests retain the exact hash, validate the package envelope and element counts,
+and exercise truncated, malformed, padding, and configured-limit failures.
+
 ## Inline rust-cab CAB fixtures
 
 `src/onenote/onepkg/cabinet.test.ts` contains byte-for-byte test arrays copied
diff --git a/tests/fixtures/joplin-quick-notes-fsshttp.one.b64 b/tests/fixtures/joplin-quick-notes-fsshttp.one.b64
new file mode 100644
index 0000000..d39e4b8
--- /dev/null
+++ b/tests/fixtures/joplin-quick-notes-fsshttp.one.b64
@@ -0,0 +1,302 @@
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