@file-viewer/ppt - npm Package Compare versions

Comparing version 0.3.1 to 0.3.2

index.mjs

@@ -1,2 +0,2 @@
-const MANIFEST = Object.freeze({"kind":"flyfish-ppt-public-native-wasm-v2","product":"Flyfish PPT Viewer","format":"PowerPoint 97-2003 (.ppt)","packageName":"@file-viewer/ppt","packageVersion":"0.3.1","engine":"flyfish-classic-ppt-native-engine","engineBuild":"593d0a6cf32f928f","id":"FV-PPT-PUBLIC-WATERMARKED-V2","feature":"ppt","edition":"public-watermarked","holder":"Individuals and Organizations","distribution":"proprietary-public-binary","commercialUse":true,"publicAnyOrigin":true,"watermarkRequired":true,"watermarkText":"Flyfish Viewer","usePolicy":"public-watermarked-general-use","licensePolicy":"flyfish-public-watermarked-binary-license-v2","sourceCodeRights":false,"sourceDeliveryRights":false,"apacheLicenseApplies":false,"redistributionAllowed":true,"redistributionPolicy":"unmodified-integrated-bundling-only","standaloneRedistributionAllowed":false,"watermarkRemovalRequiresCommercialAuthorization":true,"runtimeLicenseRequired":false,"renderer":"native-wasm-worker-offscreen-canvas","integrity":"native-wasm-font-sha256-v2","wasmFile":"ppt-native.wasm","wasmBytes":1557871,"workerFile":"worker.mjs","fontPack":{"kind":"flyfish-cjk-font-pack-v1","file":"ppt-font-cjk.otf","bytes":16437364,"sha256":"2c76254f6fc379fddfce0a7e84fb5385bb135d3e399294f6eeb6680d0365b74b"},"workerDefault":true,"virtualScrollDefault":true,"frameCache":"indexeddb-final-watermarked-png-lru","watermarkEnforcement":"native-final-frame","wasmSha256":"8e95d7de0e322d6c96dcd7ea18c5cd9b6783cb82f3fe1c8714008119f19e7915"});
+const MANIFEST = Object.freeze({"kind":"flyfish-ppt-public-native-wasm-v2","product":"Flyfish PPT Viewer","format":"PowerPoint 97-2003 (.ppt)","packageName":"@file-viewer/ppt","packageVersion":"0.3.2","engine":"flyfish-classic-ppt-native-engine","engineBuild":"ee7c677fc3007f1b","id":"FV-PPT-PUBLIC-WATERMARKED-V2","feature":"ppt","edition":"public-watermarked","holder":"Individuals and Organizations","distribution":"proprietary-public-binary","commercialUse":true,"publicAnyOrigin":true,"watermarkRequired":true,"watermarkText":"Flyfish Viewer","usePolicy":"public-watermarked-general-use","licensePolicy":"flyfish-public-watermarked-binary-license-v2","sourceCodeRights":false,"sourceDeliveryRights":false,"apacheLicenseApplies":false,"redistributionAllowed":true,"redistributionPolicy":"unmodified-integrated-bundling-only","standaloneRedistributionAllowed":false,"watermarkRemovalRequiresCommercialAuthorization":true,"runtimeLicenseRequired":false,"renderer":"native-wasm-worker-offscreen-canvas","integrity":"native-wasm-font-sha256-v2","wasmFile":"ppt-native.wasm","wasmBytes":1557871,"workerFile":"worker.mjs","fontPack":{"kind":"flyfish-cjk-font-pack-v1","file":"ppt-font-cjk.otf","bytes":16437364,"sha256":"2c76254f6fc379fddfce0a7e84fb5385bb135d3e399294f6eeb6680d0365b74b"},"workerDefault":true,"virtualScrollDefault":true,"frameCache":"indexeddb-final-watermarked-png-lru","watermarkEnforcement":"native-final-frame","wasmSha256":"6d209f487ab8be74f23b463eaecafd9f588948e75670f82e69d7b7d6b10cb6a7"});
 const DEFAULT_WASM_URL = new URL('./ppt-native.wasm', import.meta.url);
@@ -3,0 +3,0 @@ const DEFAULT_FONT_URL = new URL(`./${MANIFEST.fontPack.file}`, import.meta.url);

manifest.json

@@ -6,5 +6,5 @@ {
   "packageName": "@file-viewer/ppt",
-  "packageVersion": "0.3.1",
+  "packageVersion": "0.3.2",
   "engine": "flyfish-classic-ppt-native-engine",
-  "engineBuild": "593d0a6cf32f928f",
+  "engineBuild": "ee7c677fc3007f1b",
   "id": "FV-PPT-PUBLIC-WATERMARKED-V2",
@@ -44,3 +44,3 @@ "feature": "ppt",
   "watermarkEnforcement": "native-final-frame",
-  "wasmSha256": "8e95d7de0e322d6c96dcd7ea18c5cd9b6783cb82f3fe1c8714008119f19e7915"
+  "wasmSha256": "6d209f487ab8be74f23b463eaecafd9f588948e75670f82e69d7b7d6b10cb6a7"
 }

NOTICE

@@ -65,3 +65,2 @@ @file-viewer/ppt
 
-
 DEFINITIONS
@@ -122,3 +121,2 @@ "Font Software" refers to the set of files released by the Copyright
 
-
 TERMINATION
@@ -128,3 +126,2 @@ This license becomes null and void if any of the above conditions are not met.
 
-
 DISCLAIMER
@@ -131,0 +128,0 @@ THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

package.json

 {
   "name": "@file-viewer/ppt",
-  "version": "0.3.1",
+  "version": "0.3.2",
   "description": "Professional native WebAssembly canvas viewer for PowerPoint 97-2003 (.ppt) files.",
@@ -5,0 +5,0 @@ "type": "module",

README.md

@@ -196,5 +196,5 @@ # @file-viewer/ppt
 const viewer = await createPptViewer({
-  workerUrl: new URL('/vendor/file-viewer/ppt/0.3.1/worker.mjs', location.origin),
-  wasmUrl: new URL('/vendor/file-viewer/ppt/0.3.1/ppt-native.wasm', location.origin),
-  fontUrl: new URL('/vendor/file-viewer/ppt/0.3.1/ppt-font-cjk.otf', location.origin)
+  workerUrl: new URL('/vendor/file-viewer/ppt/0.3.2/worker.mjs', location.origin),
+  wasmUrl: new URL('/vendor/file-viewer/ppt/0.3.2/ppt-native.wasm', location.origin),
+  fontUrl: new URL('/vendor/file-viewer/ppt/0.3.2/ppt-font-cjk.otf', location.origin)
 });
@@ -451,3 +451,3 @@ ```
 
-将资源发布在版本化或内容寻址目录（如 `/vendor/file-viewer/ppt/0.3.1/`）后，
+将资源发布在版本化或内容寻址目录（如 `/vendor/file-viewer/ppt/0.3.2/`）后，
 可配置：
@@ -454,0 +454,0 @@

worker.mjs

@@ -1,3 +0,733 @@
-import { createFrameCache } from './frame-cache.mjs';
+/**
+ * Bounded, best-effort cache for final watermarked PNG frames.
+ *
+ * This module is intentionally storage-only. It does not parse PPT data, inspect
+ * font assets, or transform renderer output. Every storage failure degrades to a
+ * cache miss so IndexedDB can never become a rendering dependency.
+ */
 
+const DB_VERSION = 1;
+const FRAME_STORE = "frames";
+const META_STORE = "meta";
+const DOCUMENT_INDEX = "byDocument";
+const ACCESS_INDEX = "byLastAccess";
+const USAGE_KEY = "usage";
+
+const MIB = 1024 * 1024;
+const DEFAULT_DB_NAME = "flyfish-ppt-frame-cache-v1";
+const DEFAULT_MAX_BYTES = 256 * MIB;
+const DEFAULT_MAX_ENTRIES = 256;
+const DEFAULT_MAX_ITEM_BYTES = 32 * MIB;
+const MAX_DATABASE_NAME_LENGTH = 128;
+const MAX_DOCUMENT_ID_LENGTH = 256;
+const MAX_VARIANT_LENGTH = 256;
+const MAX_PAGE_INDEX = 10_000_000;
+const MAX_DIMENSION = 65_535;
+const OPEN_TIMEOUT_MS = 1_000;
+
+function clampInteger(value, fallback, minimum, maximum) {
+  let numeric;
+  try {
+    numeric = Number(value);
+  } catch {
+    return fallback;
+  }
+  if (!Number.isFinite(numeric)) {
+    return fallback;
+  }
+  return Math.min(maximum, Math.max(minimum, Math.trunc(numeric)));
+}
+
+function normalizeBoundedString(value, maximumLength, { trim = false } = {}) {
+  if (typeof value !== "string") {
+    return null;
+  }
+  const normalized = trim ? value.trim() : value;
+  if (normalized.length === 0 || normalized.length > maximumLength) {
+    return null;
+  }
+  return normalized;
+}
+
+/**
+ * Pure limit normalization used by both production code and unit tests.
+ */
+function normalizeFrameCacheLimits(options = {}) {
+  const source = options && typeof options === "object" ? options : {};
+  const maxBytes = clampInteger(source.maxBytes, DEFAULT_MAX_BYTES, 0, 2 * 1024 * MIB);
+  const maxEntries = clampInteger(source.maxEntries, DEFAULT_MAX_ENTRIES, 0, 4_096);
+  const defaultItemBytes = Math.min(DEFAULT_MAX_ITEM_BYTES, maxBytes);
+  const configuredItemBytes = source.maxItemBytes ?? source.maxEntryBytes;
+  const maxItemBytes = maxBytes === 0
+    ? 0
+    : clampInteger(configuredItemBytes, defaultItemBytes, 0, maxBytes);
+  return Object.freeze({ maxBytes, maxEntries, maxItemBytes });
+}
+
+/**
+ * Pure cache-key normalization. Invalid or potentially collision-prone inputs
+ * return null instead of being truncated.
+ */
+function normalizeFrameCacheKey(input, pageIndex, variant = "") {
+  const source = input && typeof input === "object"
+    ? input
+    : { documentId: input, pageIndex, variant };
+
+  const documentId = normalizeBoundedString(source.documentId, MAX_DOCUMENT_ID_LENGTH, { trim: true });
+  let normalizedPageIndex;
+  let normalizedVariant;
+  try {
+    normalizedPageIndex = Number(source.pageIndex);
+    normalizedVariant = source.variant == null ? "" : String(source.variant);
+  } catch {
+    return null;
+  }
+
+  if (
+    documentId == null
+    || !Number.isSafeInteger(normalizedPageIndex)
+    || normalizedPageIndex < 0
+    || normalizedPageIndex > MAX_PAGE_INDEX
+    || normalizedVariant.length > MAX_VARIANT_LENGTH
+  ) {
+    return null;
+  }
+
+  // Length-prefixing prevents separators inside opaque identifiers from
+  // creating collisions.
+  const key = `v1:${documentId.length}:${documentId}:${normalizedPageIndex}:${normalizedVariant.length}:${normalizedVariant}`;
+  return Object.freeze({
+    key,
+    documentId,
+    pageIndex: normalizedPageIndex,
+    variant: normalizedVariant,
+  });
+}
+
+function createFrameCacheKey(documentId, pageIndex, variant = "") {
+  return normalizeFrameCacheKey(documentId, pageIndex, variant)?.key ?? null;
+}
+
+function normalizeDatabaseName(value) {
+  return normalizeBoundedString(value, MAX_DATABASE_NAME_LENGTH, { trim: true }) ?? DEFAULT_DB_NAME;
+}
+
+function isPngBlob(blob) {
+  return Boolean(
+    blob
+    && typeof blob === "object"
+    && Number.isSafeInteger(blob.size)
+    && blob.size > 0
+    && typeof blob.arrayBuffer === "function"
+    && typeof blob.type === "string"
+    && blob.type.toLowerCase() === "image/png",
+  );
+}
+
+function normalizeDimension(value) {
+  let numeric;
+  try {
+    numeric = Number(value);
+  } catch {
+    return null;
+  }
+  return Number.isSafeInteger(numeric) && numeric > 0 && numeric <= MAX_DIMENSION
+    ? numeric
+    : null;
+}
+
+function normalizePutArguments(keyInput, frameInput, limits) {
+  const frame = frameInput && typeof frameInput === "object" ? frameInput : keyInput;
+  const key = normalizeFrameCacheKey(keyInput);
+  const width = normalizeDimension(frame?.width);
+  const height = normalizeDimension(frame?.height);
+  const blob = frame?.blob;
+
+  if (key == null || width == null || height == null || !isPngBlob(blob)) {
+    return null;
+  }
+  if (blob.size > limits.maxItemBytes || blob.size > limits.maxBytes) {
+    return null;
+  }
+  return { ...key, blob, width, height, byteSize: blob.size };
+}
+
+function requestResult(request) {
+  return new Promise((resolve, reject) => {
+    request.onsuccess = () => resolve(request.result);
+    request.onerror = () => reject(request.error ?? new Error("IndexedDB request failed"));
+  });
+}
+
+function transactionError(transaction, fallbackMessage) {
+  return transaction.error ?? new Error(fallbackMessage);
+}
+
+function openDatabase(factory, dbName) {
+  return new Promise((resolve, reject) => {
+    let settled = false;
+    let request;
+    let timer = null;
+
+    const settle = (callback, value) => {
+      if (settled) {
+        if (value && typeof value.close === "function") {
+          value.close();
+        }
+        return;
+      }
+      settled = true;
+      if (timer != null) {
+        clearTimeout(timer);
+      }
+      callback(value);
+    };
+
+    try {
+      request = factory.open(dbName, DB_VERSION);
+    } catch (error) {
+      settle(reject, error);
+      return;
+    }
+
+    request.onupgradeneeded = () => {
+      const database = request.result;
+      let frameStore;
+      if (!database.objectStoreNames.contains(FRAME_STORE)) {
+        frameStore = database.createObjectStore(FRAME_STORE, { keyPath: "key" });
+      } else {
+        frameStore = request.transaction.objectStore(FRAME_STORE);
+      }
+      if (!frameStore.indexNames.contains(DOCUMENT_INDEX)) {
+        frameStore.createIndex(DOCUMENT_INDEX, "documentId", { unique: false });
+      }
+      if (!frameStore.indexNames.contains(ACCESS_INDEX)) {
+        frameStore.createIndex(ACCESS_INDEX, "lastAccess", { unique: false });
+      }
+      if (!database.objectStoreNames.contains(META_STORE)) {
+        database.createObjectStore(META_STORE, { keyPath: "key" });
+      }
+    };
+    request.onsuccess = () => settle(resolve, request.result);
+    request.onerror = () => settle(reject, request.error ?? new Error("Unable to open IndexedDB"));
+    request.onblocked = () => settle(reject, new Error("IndexedDB open was blocked"));
+
+    if (typeof setTimeout === "function") {
+      timer = setTimeout(() => {
+        settle(reject, new Error("IndexedDB open timed out"));
+      }, OPEN_TIMEOUT_MS);
+    }
+  });
+}
+
+function isStoredFrameValid(record) {
+  return Boolean(
+    record
+    && typeof record === "object"
+    && typeof record.key === "string"
+    && typeof record.documentId === "string"
+    && Number.isSafeInteger(record.pageIndex)
+    && normalizeDimension(record.width) != null
+    && normalizeDimension(record.height) != null
+    && Number.isSafeInteger(record.byteSize)
+    && record.byteSize > 0
+    && isPngBlob(record.blob)
+    && record.blob.size === record.byteSize,
+  );
+}
+
+function reconcileUsage(database, limits) {
+  return new Promise((resolve, reject) => {
+    let transaction;
+    try {
+      transaction = database.transaction([FRAME_STORE, META_STORE], "readwrite");
+    } catch (error) {
+      reject(error);
+      return;
+    }
+
+    const frames = transaction.objectStore(FRAME_STORE);
+    const meta = transaction.objectStore(META_STORE);
+    let totalBytes = 0;
+    let totalEntries = 0;
+
+    const writeUsage = () => {
+      meta.put({
+        key: USAGE_KEY,
+        totalBytes,
+        totalEntries,
+        updatedAt: Date.now(),
+      });
+    };
+
+    const withinLimits = () => (
+      totalBytes <= limits.maxBytes
+      && totalEntries <= limits.maxEntries
+    );
+
+    const trimOldest = () => {
+      if (withinLimits()) {
+        writeUsage();
+        return;
+      }
+      const trimRequest = frames.index(ACCESS_INDEX).openCursor();
+      trimRequest.onsuccess = () => {
+        const cursor = trimRequest.result;
+        if (cursor == null) {
+          totalBytes = 0;
+          totalEntries = 0;
+          writeUsage();
+          return;
+        }
+        const record = cursor.value;
+        cursor.delete();
+        if (isStoredFrameValid(record)) {
+          totalBytes = Math.max(0, totalBytes - record.byteSize);
+          totalEntries = Math.max(0, totalEntries - 1);
+        }
+        if (withinLimits()) {
+          writeUsage();
+        } else {
+          cursor.continue();
+        }
+      };
+    };
+
+    const cursorRequest = frames.openCursor();
+    cursorRequest.onsuccess = () => {
+      const cursor = cursorRequest.result;
+      if (cursor == null) {
+        trimOldest();
+        return;
+      }
+      const record = cursor.value;
+      if (isStoredFrameValid(record) && record.byteSize <= limits.maxItemBytes) {
+        totalBytes += record.byteSize;
+        totalEntries += 1;
+      } else {
+        cursor.delete();
+      }
+      cursor.continue();
+    };
+
+    transaction.oncomplete = () => resolve({ totalBytes, totalEntries });
+    transaction.onerror = () => reject(transactionError(transaction, "IndexedDB reconciliation failed"));
+    transaction.onabort = () => reject(transactionError(transaction, "IndexedDB reconciliation was aborted"));
+  });
+}
+
+function readUsageRecord(value) {
+  const totalBytes = Number.isSafeInteger(value?.totalBytes) && value.totalBytes >= 0
+    ? value.totalBytes
+    : 0;
+  const totalEntries = Number.isSafeInteger(value?.totalEntries) && value.totalEntries >= 0
+    ? value.totalEntries
+    : 0;
+  return { totalBytes, totalEntries };
+}
+
+function putFrame(database, record, limits) {
+  return new Promise((resolve, reject) => {
+    let transaction;
+    try {
+      transaction = database.transaction([FRAME_STORE, META_STORE], "readwrite");
+    } catch (error) {
+      reject(error);
+      return;
+    }
+
+    const frames = transaction.objectStore(FRAME_STORE);
+    const meta = transaction.objectStore(META_STORE);
+    let existing;
+    let usage;
+    let existingReady = false;
+    let usageReady = false;
+    let started = false;
+
+    const failRequest = () => {
+      try {
+        transaction.abort();
+      } catch {
+        // The transaction may already have been aborted by the browser.
+      }
+    };
+
+    const finalizeWrite = () => {
+      const now = record.lastAccess;
+      frames.put(record);
+      meta.put({
+        key: USAGE_KEY,
+        totalBytes: usage.totalBytes,
+        totalEntries: usage.totalEntries,
+        updatedAt: now,
+      });
+    };
+
+    const evictIfNeeded = () => {
+      if (started || !existingReady || !usageReady) {
+        return;
+      }
+      started = true;
+
+      const oldBytes = isStoredFrameValid(existing) ? existing.byteSize : 0;
+      const oldEntries = isStoredFrameValid(existing) ? 1 : 0;
+      usage.totalBytes = Math.max(0, usage.totalBytes - oldBytes) + record.byteSize;
+      usage.totalEntries = Math.max(0, usage.totalEntries - oldEntries) + 1;
+
+      const withinLimits = () => (
+        usage.totalBytes <= limits.maxBytes
+        && usage.totalEntries <= limits.maxEntries
+      );
+
+      if (withinLimits()) {
+        finalizeWrite();
+        return;
+      }
+
+      const cursorRequest = frames.index(ACCESS_INDEX).openCursor();
+      cursorRequest.onsuccess = () => {
+        const cursor = cursorRequest.result;
+        if (cursor == null) {
+          if (withinLimits()) {
+            finalizeWrite();
+          } else {
+            failRequest();
+          }
+          return;
+        }
+
+        const candidate = cursor.value;
+        if (candidate?.key !== record.key && isStoredFrameValid(candidate)) {
+          cursor.delete();
+          usage.totalBytes = Math.max(0, usage.totalBytes - candidate.byteSize);
+          usage.totalEntries = Math.max(0, usage.totalEntries - 1);
+        } else if (candidate?.key !== record.key) {
+          cursor.delete();
+        }
+
+        if (withinLimits()) {
+          finalizeWrite();
+        } else {
+          cursor.continue();
+        }
+      };
+      cursorRequest.onerror = failRequest;
+    };
+
+    const existingRequest = frames.get(record.key);
+    existingRequest.onsuccess = () => {
+      existing = existingRequest.result;
+      existingReady = true;
+      evictIfNeeded();
+    };
+    existingRequest.onerror = failRequest;
+
+    const usageRequest = meta.get(USAGE_KEY);
+    usageRequest.onsuccess = () => {
+      usage = readUsageRecord(usageRequest.result);
+      usageReady = true;
+      evictIfNeeded();
+    };
+    usageRequest.onerror = failRequest;
+
+    transaction.oncomplete = () => resolve(true);
+    transaction.onerror = () => reject(transactionError(transaction, "IndexedDB frame write failed"));
+    transaction.onabort = () => reject(transactionError(transaction, "IndexedDB frame write was aborted"));
+  });
+}
+
+function getFrame(database, key, nextAccess) {
+  return new Promise((resolve, reject) => {
+    let transaction;
+    try {
+      transaction = database.transaction(FRAME_STORE, "readwrite");
+    } catch (error) {
+      reject(error);
+      return;
+    }
+
+    const store = transaction.objectStore(FRAME_STORE);
+    let result = null;
+    const request = store.get(key.key);
+    request.onsuccess = () => {
+      const record = request.result;
+      if (!isStoredFrameValid(record)) {
+        if (record != null) {
+          store.delete(key.key);
+        }
+        return;
+      }
+      record.lastAccess = nextAccess();
+      store.put(record);
+      result = {
+        blob: record.blob,
+        width: record.width,
+        height: record.height,
+        byteSize: record.byteSize,
+        lastAccess: record.lastAccess,
+      };
+    };
+
+    transaction.oncomplete = () => resolve(result);
+    transaction.onerror = () => reject(transactionError(transaction, "IndexedDB frame read failed"));
+    transaction.onabort = () => reject(transactionError(transaction, "IndexedDB frame read was aborted"));
+  });
+}
+
+function deleteFrame(database, key) {
+  return new Promise((resolve, reject) => {
+    let transaction;
+    try {
+      transaction = database.transaction([FRAME_STORE, META_STORE], "readwrite");
+    } catch (error) {
+      reject(error);
+      return;
+    }
+
+    const frames = transaction.objectStore(FRAME_STORE);
+    const meta = transaction.objectStore(META_STORE);
+    let deleted = false;
+    const getRequest = frames.get(key.key);
+    getRequest.onsuccess = () => {
+      const existing = getRequest.result;
+      if (existing == null) {
+        return;
+      }
+      deleted = true;
+      const existingIsValid = isStoredFrameValid(existing);
+      const usageRequest = meta.get(USAGE_KEY);
+      usageRequest.onsuccess = () => {
+        const usage = readUsageRecord(usageRequest.result);
+        frames.delete(key.key);
+        meta.put({
+          key: USAGE_KEY,
+          totalBytes: Math.max(0, usage.totalBytes - (existingIsValid ? existing.byteSize : 0)),
+          totalEntries: Math.max(0, usage.totalEntries - (existingIsValid ? 1 : 0)),
+          updatedAt: Date.now(),
+        });
+      };
+    };
+
+    transaction.oncomplete = () => resolve(deleted);
+    transaction.onerror = () => reject(transactionError(transaction, "IndexedDB frame delete failed"));
+    transaction.onabort = () => reject(transactionError(transaction, "IndexedDB frame delete was aborted"));
+  });
+}
+
+function clearDocumentFrames(database, documentId) {
+  return new Promise((resolve, reject) => {
+    let transaction;
+    try {
+      transaction = database.transaction([FRAME_STORE, META_STORE], "readwrite");
+    } catch (error) {
+      reject(error);
+      return;
+    }
+
+    const frames = transaction.objectStore(FRAME_STORE);
+    const meta = transaction.objectStore(META_STORE);
+    let usage = null;
+    let cursorFinished = false;
+    let deletedEntries = 0;
+    let deletedBytes = 0;
+    let finalized = false;
+
+    const maybeFinalize = () => {
+      if (finalized || usage == null || !cursorFinished) {
+        return;
+      }
+      finalized = true;
+      meta.put({
+        key: USAGE_KEY,
+        totalBytes: Math.max(0, usage.totalBytes - deletedBytes),
+        totalEntries: Math.max(0, usage.totalEntries - deletedEntries),
+        updatedAt: Date.now(),
+      });
+    };
+
+    const usageRequest = meta.get(USAGE_KEY);
+    usageRequest.onsuccess = () => {
+      usage = readUsageRecord(usageRequest.result);
+      maybeFinalize();
+    };
+
+    const cursorRequest = frames.index(DOCUMENT_INDEX).openCursor(documentId);
+    cursorRequest.onsuccess = () => {
+      const cursor = cursorRequest.result;
+      if (cursor == null) {
+        cursorFinished = true;
+        maybeFinalize();
+        return;
+      }
+      const record = cursor.value;
+      if (isStoredFrameValid(record)) {
+        deletedEntries += 1;
+        deletedBytes += record.byteSize;
+      }
+      cursor.delete();
+      cursor.continue();
+    };
+
+    transaction.oncomplete = () => resolve(deletedEntries);
+    transaction.onerror = () => reject(transactionError(transaction, "IndexedDB document clear failed"));
+    transaction.onabort = () => reject(transactionError(transaction, "IndexedDB document clear was aborted"));
+  });
+}
+
+/**
+ * Create a cache facade that is safe in Window and DedicatedWorkerGlobalScope.
+ * The facade is synchronous; all storage methods are asynchronous and never
+ * throw for storage availability, quota, cloning, or transaction failures.
+ */
+function createFrameCache(options = {}) {
+  const source = options && typeof options === "object" ? options : {};
+  const limits = normalizeFrameCacheLimits(source);
+  const dbName = normalizeDatabaseName(source.dbName);
+  const factory = source.indexedDB ?? globalThis.indexedDB;
+  const enabled = source.enabled !== false;
+  let closed = false;
+  let disabledReason = !enabled
+    ? "disabled"
+    : factory && typeof factory.open === "function"
+      ? null
+      : "unavailable";
+  let databasePromise = null;
+  let lastAccess = 0;
+
+  const nextAccess = () => {
+    lastAccess = Math.max(Date.now(), lastAccess + 1);
+    return lastAccess;
+  };
+
+  const disable = (error) => {
+    if (disabledReason == null) {
+      disabledReason = typeof error?.name === "string" && error.name
+        ? error.name
+        : "storage-error";
+    }
+    if (databasePromise != null) {
+      databasePromise.then((database) => database?.close()).catch(() => {});
+    }
+  };
+
+  const getDatabase = async () => {
+    if (closed || disabledReason != null) {
+      return null;
+    }
+    if (databasePromise == null) {
+      databasePromise = openDatabase(factory, dbName)
+        .then(async (database) => {
+          database.onversionchange = () => {
+            database.close();
+            disable({ name: "version-change" });
+          };
+          await reconcileUsage(database, limits);
+          return database;
+        })
+        .catch((error) => {
+          disable(error);
+          return null;
+        });
+    }
+    return databasePromise;
+  };
+
+  const run = async (operation, fallback) => {
+    if (closed || disabledReason != null) {
+      return fallback;
+    }
+    const database = await getDatabase();
+    if (database == null) {
+      return fallback;
+    }
+    try {
+      return await operation(database);
+    } catch (error) {
+      // QuotaExceededError, Safari's InvalidStateError / TransactionInactiveError,
+      // private-mode failures, and structured-clone failures all become misses.
+      disable(error);
+      return fallback;
+    }
+  };
+
+  return Object.freeze({
+    async get(keyInput) {
+      const key = normalizeFrameCacheKey(keyInput);
+      if (key == null) {
+        return null;
+      }
+      return run((database) => getFrame(database, key, nextAccess), null);
+    },
+
+    async put(keyInput, frameInput) {
+      const input = normalizePutArguments(keyInput, frameInput, limits);
+      if (input == null) {
+        return false;
+      }
+      const record = {
+        ...input,
+        lastAccess: nextAccess(),
+      };
+      return run((database) => putFrame(database, record, limits), false);
+    },
+
+    async delete(keyInput) {
+      const key = normalizeFrameCacheKey(keyInput);
+      if (key == null) {
+        return false;
+      }
+      return run((database) => deleteFrame(database, key), false);
+    },
+
+    async clearDocument(documentId) {
+      const normalized = normalizeBoundedString(documentId, MAX_DOCUMENT_ID_LENGTH, { trim: true });
+      if (normalized == null) {
+        return 0;
+      }
+      return run((database) => clearDocumentFrames(database, normalized), 0);
+    },
+
+    async stats() {
+      const unavailable = () => ({
+        available: false,
+        disabledReason: closed ? "closed" : disabledReason ?? "unavailable",
+        entries: 0,
+        totalBytes: 0,
+        ...limits,
+      });
+      if (closed || disabledReason != null) {
+        return unavailable();
+      }
+      const result = await run(async (database) => {
+        let transaction;
+        try {
+          transaction = database.transaction(META_STORE, "readonly");
+        } catch (error) {
+          throw error;
+        }
+        const value = await requestResult(transaction.objectStore(META_STORE).get(USAGE_KEY));
+        const usage = readUsageRecord(value);
+        return {
+          available: true,
+          disabledReason: null,
+          entries: usage.totalEntries,
+          totalBytes: usage.totalBytes,
+          ...limits,
+        };
+      }, null);
+      return result ?? unavailable();
+    },
+
+    close() {
+      if (closed) {
+        return;
+      }
+      closed = true;
+      if (databasePromise != null) {
+        databasePromise.then((database) => database?.close()).catch(() => {});
+      }
+    },
+  });
+}
+
 const WASM_EXPORTS = Object.freeze([
@@ -4,0 +734,0 @@ 'memory',

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